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Hitachi SAMURAI Series Service Manual

Condenserless water chillers
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SAMURAI SERIES
CONDENSERLESS WATER CHILLERS
-MODULAR-R134a-SCREW TYPE-
Service Manual
RCME-(40-60)CLH

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Summary of Contents for Hitachi SAMURAI Series

  • Page 1 SAMURAI SERIES CONDENSERLESS WATER CHILLERS -MODULAR-R134a-SCREW TYPE- Service Manual RCME-(40-60)CLH...
  • Page 3 Contents C o n t e n t s General information Control Functions Servicing Troubleshooting SMGB0097 rev.0 - 07/2015...

  • Page 5: Table Of Contents

    General Index General index General information ..................... 1 General notes ............................2 Safety and applied symbols ........................3 Product guide ............................4 1.3.1  Classification of water chiller models ......................4 1.3.2  Product guide: Water chillers........................... 4 Control Functions ......................5 2.1  Control functions on the module......................6 2.1.1 Water control ..............................9 2.1.2 Water temperature control ..........................
  • Page 6 General Index Run operation ............................51 2.4.1  Setting of switches on the setting PCB ......................51 2.4.2  Operation control of the module ........................52 2.5  Time chart ............................. 53 Servicing ........................55 LCD display for Service Menu ....................... 57 General notes ............................65 Cycle components ..........................66 3.3.1 Compressor removal ............................. 66 3.3.2 ...
  • Page 7 General Index 3.4.9  Contactors (CMC, CMCD, CMCS) ........................ 86 3.4.10  Fuses (EF1, EF2, EF3. EFR, EFS, EFT) ....................86 3.4.11  Fuses (PFC) ..............................87 3.4.12 Relays ................................. 88 3.4.13  Main Switch ..............................89 4.  Troubleshooting ......................91 4.1  Inspection of power source and connections ..................92 4.2  Inspection of PCB..........................93 4.3  Confirmation of operating value of protection devices and automatic operation devices ..... 93 Protection control function ........................94 Caution indication ..........................
  • Page 8 1. General information G e n e r a l i n f o r m a t i o n Index General notes ............................2 Safety and applied symbols ........................3 Product guide ............................4 1.3.1  Classification of water chiller models ......................4 1.3.2 ...

  • Page 9: General Information

    1. General information General notes 1.1 General notes © Copyright 2014 HITACHI Air Conditioning Products Europe, S.A.U. – All rights reserved. No part of this publication may be reproduced, copied, filed or transmitted in any shape or form without the permission of  HITACHI Air Conditioning Products Europe, S.A.U. Within the policy of continuous improvement of its products, HITACHI Air Conditioning Products Europe, S.A.U. reserves  the right to make changes at any time without prior notification and without being compelled to introducing them into prod- ucts subsequently sold. This document may therefore have been subject to amendments during the life of the product. HITACHI makes every effort to offer correct, up-to-date documentation. Despite this, printing errors cannot be controlled by  HITACHI and are not its responsibility. As a result, some of the images or data used to illustrate this document may not refer to specific models. No claims will be  accepted based on the data, illustrations and descriptions included in this document. No type of modification must be made to the equipment without prior, written authorisation from the manufacturer. HITACHI pursues a policy of continuing improvement in design and performance of products. The right is therefore re- served to vary specifications without notice. HITACHI cannot anticipate every possible circumstance that might involve a potential hazard. No part of this document may be reproduced without written permission. If you have any questions, contact your service contractor of HITACHI. Check and make sure that the explanations of each part of this Technical Catalogue correspond to your water chiller model.  Refer to the models codification to confirm the main characteristics of your system. Signal words (DANGER, WARNING and CAUTION) are used to identify levels of hazard seriousness. Definitions for iden- tifying hazard levels are provided below with their respective signal words. It is assumed that this unit will be operated and serviced by English speaking people. If this is not the case, the customer  should add safety, caution and operating signs in the native language of the personal. This water chiller has been designed for the working range described in the corresponding chapter. SMGB0097 rev.0 - 07/2015...

  • Page 10: Safety And Applied Symbols

    1. General information Safety and applied symbols 1.2 Safety and applied symbols During normal system design work or unit installation, greater attention must be paid in certain situations requiring particu- lar care in order to avoid damage to the unit, the installation or the building or property. Situations that jeopardise the safety of those in the surrounding area or that put the unit itself at risk will be clearly indicated  in this manual. To indicate these situations, a series of special symbols will be used to clearly identify these situations. Pay close attention to these symbols and to the messages following them, as your safety and that of others depends on it. D A N G E R • The text following this symbol contains information and instructions relating directly to your safety and phy- sical wellbeing.

  • Page 11: Product Guide

    1. General information Product guide 1.3 Product guide 1.3.1 Classification of water chiller models  Basic modules Unit type (Modular water chiller): RCM E = Made in Europe Position-separating hyphen (fixed) Capacity (HP): 40, 50, 60 CL = Condenser Less H = R134a refrigerant – 1.3.2 Product guide: Water chillers  Basic modules 3N~ 400V 50Hz Unit Code RCME-40CLH...

  • Page 12: Control Functions

    2. Control Functions C o n t r o l F u n c t i o n s Index 2.1  Control functions on the module......................6 2.1.1 Water control ..............................9 2.1.2 Water temperature control ..........................10 2.1.3 Compressor Control ............................13 2.1.4  Control for recovery from power interruption (Option) ................... 15 2.1.5 Prevention of simultaneous startup .......................

  • Page 13: Control Functions On The Module

    2. Control Functions Control functions on the module 2.1 Control functions on the module  List of the main control functions Item Description Slide valve control The outlet water temperature of the chiller unit is detected with a thermistor, and the stroke of slide valve is  controlled continuously by time-sharing.  Example of cooling operation: Outlet Water Temperature Load up area Neutral Zone Setting Temperature (Hold) Load down area Capacity control range: 100~25%, Stop. Thermo ON-OFF control When operation load becomes light, outlet water temperature falls below the "Stop temperature range" against ...
  • Page 14 2. Control Functions Control functions on the module Item Description Anti-freezing for In order to prevent freezing caused by a decrease of water temperature in winter or under other low ambient  winter temperature conditions, pump operation order is output automatically. (Automatic pump  operation) N O T E Starting conditions can be selected locally from the 3 types below. • Water temperature under 15ºC (mainly for systems where the total pump head from the chiller unit to the load side is supported by a common pump.
  • Page 15 2. Control Functions Control functions on the module Item Description It is possible to determine thermo OFF from the inlet water temperature (return temperature from load) of the  chiller unit. It is possible to change the settings of thermo OFF temperature.  Thermo OFF  judgement due to  N O T E inlet temperature Since this function is optional, it is necessary to make the settings for the enabling of this function at the time of local installation. When an alarm occurs, the contents of the alarm, as well as the date and time of occurrence are recorded. ...

  • Page 16: Water Control

    2. Control Functions Control functions on the module 2.1.1 Water control Outlet water temperature of Chiller Unit is detected by Thermistor, and based on this value, compressor ON/OFF and the  most suitable capacity is determined. Following shown the continuous capacity control and change of water temperature. Starting setting (example) Outlet Tsc : 7ºC temperature Inlet T1: 1ºC temperature T2: 2ºC T3: 2ºC T4: 1ºC Memorizes the inlet temperature  at Thermo-OFF and re-start at  ∆T2 Load up I zone Tsc+ T2/3+ T4 9ºC (1.0~4.0ºC) Load up II zone (1.0~3.0ºC) Tsc+ T2/3 8ºC...

  • Page 17: Water Temperature Control

    2. Control Functions Control functions on the module 2.1.2 Water temperature control 1 Automatic temperature adjustment Compressor  run/stop  and  capacity  control  are  performed  by  detecting  water  temperature  of  the  chiller  unit  with  thermistors. Water Temp Set ON/OFF Temperature Difference Stop Temperature Range Item Model Available range Setting range Setting range Step (ºC)
  • Page 18 2. Control Functions Control functions on the module 2 Method to change settings a. Water temperature settings INPUT The part with the setting temperature  currently enabled is illuminated Select the setting value  with up and down keys Register with [ENT] key Cancel with [CAN] key N O T E • [Set1]: This is the setting value of the master chiller unit, and water temperature control is normally performed against this setting value.
  • Page 19 2. Control Functions Control functions on the module b. Setting of other water temperature control settings Continuous control type Display the input window with [INPUT] key Input the setting value with up and down  keys Register the input value and close the  window by pressing the [ENT] key. Also,  by pressing the [CAN] key the input  value is not registered, and the window is  closed. SMGB0097 rev.0 - 07/2015...

  • Page 20: Compressor Control

    2. Control Functions Control functions on the module 2.1.3 Compressor Control 1 Startup control The  chiller  unit  receives  an  operation  order,  the  cool  water  pump  starts  up,  and  after  interlock  is  complete  and  compressor delay time (initial setting: 0.5 minutes) has passed, compressor is started up. In continuous control type,  startup takes place in a state in which the slide valve is moved to the smallest load position.  Compressor delay time can be adjusted. change the setting value to one which is adequate for the local facilities, to  avoid compressor startup before ensuring a sufficient cold water flow. 2 Normal Operation is performed with the smallest load for 1 minute after compressor startup. After finishing startup control, control is shifted to normal water temperature control. 3 Stop a. At Themo OFF Continuous control type stops suddenly. At this time, the compressor sounds as if it was counter-rotating, due to the ...
  • Page 21 2. Control Functions Control functions on the module 4 Setting method of compressor delay time Display the input window with [INPUT] key Input the setting value with up and down  keys Register the input value and close the  window by pressing the [ENT] key. Also, by  pressing the [CAN] key the input value is  not registered, and the window is closed SMGB0097 rev.0 - 07/2015...

  • Page 22: Control For Recovery From Power Interruption (Option)

    2. Control Functions Control functions on the module 2.1.4 Control for recovery from power interruption (Option) When  this  function  is  enabled,  even  in  the  case  of  power  interruptions  exceeding  2  seconds  in  length,  operation  restarts  automatically  in  the  operation  mode  as  before  the  power  failure,  once  a  3-minute  guard  has  passed.  To enable this function, the DIP switch of option C on the settings PCB (PCB ) (DSW5-1#) has to be set to ON.

  • Page 23: Prevention Of Simultaneous Startup

    2. Control Functions Control functions on the module 2.1.5 Prevention of simultaneous startup This function prevents simultaneous startup when supplying power to multiple units (in case that all modules are working  individually, not in a master-slave group) In case that multiple chiller units are installed, it may be thought that all of them will start operation simultaneously when  3  minutes  have  passed  after  entering  in  recovery  from  power  interruption.  (Note:  When  using  the  function  to  control  the number of units, simultaneous startup is prevented by performing sequential startup automatically. ) To prevent this  phenomenon, it is possible to shift the settings of time guard (3 minutes).  Setting method By means of DIP switch setting (DSW3-1#, 3-2# ,3-3#), the following number of seconds are added to the time guard (3  minutes).  DIP  switches  (DSW3-1#,  3-2#,  3-3#)  are  used  for  address  setting  when  using  the  functions  to  control  the  number  of  units, but the addition of time to the 3-minutes guard is effective even if these functions are not used. In this case, it is not ...

  • Page 24: Anti-Freezing Control For Winter

    2. Control Functions Control functions on the module 2.1.7 Anti-Freezing Control for Winter When operation is stopped during winter, the temperature of cold water decreases and may induce freezing of the water- side heat exchanger or the piping system. The outdoor temperature and cold water temperature are detected, to operate  the cold water circulation pump automatically, and protect the chiller unit from freezing.  There are 2 modes to define the run/stop conditions of the cold water circulation pump. Select the most appropriate mode  depending on the system structure and usage purpose. 1 Mode I (Factory default) Mode I is used mainly for systems composed of 1 chiller unit, or those with fixed flow. Since the entire water circuit is  protected, the cold water pump is operated from a comparatively high water temperature. Example of system where Mode I is recommended Load 3-Way Valve △ Chiller  unit Cold water  circulation pump a. When outdoor temperature is under 2ºC When outdoor temperature falls under 2ºC, the operation order of cold water circulation pump is output, and the  continuous  operation  of  the  cold  water  pump  starts  automatically.  Here,  when  cold  water  temperature  becomes  higher than 15ºC, operation becomes intermittent, with the pump running for 5 minutes, then stopped during 55 ...
  • Page 25 2. Control Functions Control functions on the module 2 Mode II Mode II is used mainly for systems containing multiple chiller units, or those with variable flow. To avoid alteration of the  water temperature of the rest of chiller units in operation, the pump is operated with a low water temperature. Load △ Secondary pump Chiller  unit Chiller  unit Primary pump a. When outdoor temperature is under 2ºC When outdoor temperature falls under 2ºC, the operation order of the pump is output, and the continuous operation  of the cold water circulation pump starts automatically. Here, when cold water temperature becomes higher than  5ºC, operation becomes intermittent, with the pump running for 5 minutes, then stopped during 55 minutes.  When cold water temperature rises even further, above 7ºC, the pump operation order output is set to OFF. b. Automatic release of anti-freezing operation This operation is released when outdoor temperature becomes higher than 4ºC. Explanation of codes More than More than Continuous pump operation Less than Less than △...
  • Page 26 2. Control Functions Control functions on the module  Mode selection method N O T E This control is not performed when [Disable] is selected. In this case, make sure to implement anti-freeze measures on site, such as pump automatic operation or the installation of a heater at the water-side heat exchanger of the chiller unit.

  • Page 27: Control For Prevention Of Wrong Operation And Wrong Settings

    2. Control Functions Control functions on the module 2.1.8 Control for prevention of wrong operation and wrong settings In the following cases, an alarm is output as wrong operation. 1 Wrong activation of the operation controls A wrong operation alarm is displayed when there is a remote input (including external thermo signal) while the unit  is stopped, regardless of "local/remote switch" being switched to local (local operation mode). Also, while on remote  operation mode, even if there is a local input (run switch on the control display part of the main unit) while the unit is  stopped, it is ignored and no alarm is displayed.  2 Wrong local/remote activation When switching the operation mode from local to remote, or from remote to local, using the "local/remote switch" while  the chiller unit is in operation, the chiller unit is stopped and a wrong operation alarm is displayed.  3 Wrong setting of DIP switches A wrong setting alarm (40-40) is displayed upon power ON in case that DIP switches are set to an impossible setting. 2.1.9 Demand control It is a control that allows to cause a forced thermo OFF of the chiller unit with orders from the local control panel (by means  of peak cut, etc.) or to restrain the maximum limit of compressor operating capacity. Since it also allows to force a change  of the operation capacity, in response to the load of the facility, it is a convenient function to perform temperature control  from the local control panel.  Forced thermo OFF function a.
  • Page 28 2. Control Functions Control functions on the module  Current limit function (Power demand control) a. Contents of activation It is possible to operate below a maximum current limitation ratio previously set at the LCD screen. The selection to  enable or release the setting value is performed with the order signal from the local control board. Also, the overcurrent protection control is always enabled, even in a state where this function is disabled. b. Setting method when cooling mode is set Display the input window with [INPUT] key Input the setting value with up and down keys Confirm with [ENT] key Cancel with [CAN] key SMGB0097 rev.0 - 07/2015...
  • Page 29 2. Control Functions Control functions on the module c. Time chart Control setting value for overcurrent protection Maximum current Setting value of limitation value current limitation External signal X d. Wiring method Control board of the chiller unit Power  Maximum current source of limitation switch the local  control board 2 0V N O T E •...

  • Page 30: Forced Load Up Capacity Control From External Signal

    2. Control Functions Control functions on the module 2.1.10 Forced load up capacity control from external signal It is possible to force load up according to usage purpose. a. Contents of activation It is possible to force load up from the orders of local control panel. b. Time chart Normal Normal operation operation Forced load up Forced load Capacity control Normal...

  • Page 31: 2-Temperature Setting Function

    2. Control Functions Control functions on the module 2.1.11 2-temperature setting function Regarding to the temperature setting of water temperature control, it is possible to set 2 different temperatures, and select  which of these to be used as a setting temperature by means of a remote signal.  This change is useful to cope with differences of load in usage, such as those between day and night operation.  Measurement method Install the switch for exchanging the 2 temperatures between terminals [23] and [24]. When [23]-[24] are short-circuited, the mark next to "Temp Set2" on the water temperature setting screen is illuminated, to  indicate that the 2 temperature setting has become enabled. 2 - temperature Disabled settings enabled N O T E • Before operating the chiller unit, select which temperature to use as setting temperature from the 1st and the 2nd (switch selection), then operate the chiller unit (it is possible to switch during operation, but it may cause instability of the operation, such as instant thermo OFF, etc.) •...

  • Page 32: External Thermo Operation From External Contact

    2. Control Functions Control functions on the module 2.1.12 External thermo operation from external contact In case of setting the chiller unit to run/stop with the order of an external contact such as that of a (locally supplied) external  thermo, capacity control function is disabled and operation is performed at 100% load. This function is mainly oriented to  thermal storage operation. It is not possible to use this function together with the function to control the number of units.  Setting method 1 Set the local/remote switch (SW2 on PCBa) to remote side.  2 Connect the forced load operation switch to [24]-[25] of terminal block. 3 The  wiring  side  used  together  by  normal  remote  operation  (air  conditioning  operation)  and  forced  load  operation  (thermal storage operation) is shown. Remove the wiring between ...
  • Page 33 2. Control Functions Control functions on the module Thermo OFF temperature of the main unit remains enabled even during forced load operation. When performing thermal  storage from an external thermo, set the external thermo to activate before the thermo OFF temperature of the main unit.  In case of stop by thermo OFF temperature of the main unit, operation restarts automatically.  When performing thermal storage from the main unit thermo, it is possible to prevent restart by turning the pump OFF with  optional function "Pump operation in ON/OFF Cont.".  Setting method Select "OFF" SMGB0097 rev.0 - 07/2015...

  • Page 34: Water Temperature Of The Control Target

    2. Control Functions Control functions on the module 2.1.13 Water Temperature of the Control Target It is possible to select which water temperature to use for capacity control and thermo OFF judgement, either "Inlet" or  "Outlet". Use the outlet water temperature (factory default setting) in normal conditions.  Setting method Select "IN" SMGB0097 rev.0 - 07/2015...

  • Page 35: Operation From Dc24V Contact Input

    2. Control Functions Control functions on the module 2.1.14 Operation from DC24V contact input  Outline The procedure to control operation from the DC24V contact of the local central controller is shown below.  • Level input • Pulse input (1 switch) • Pulse input (2 switches) Arrange the settings and additional wiring necessary for each of them, as shown in the following sections. Available only in  remote mode during independent operation of the chiller unit.  Level input a. Signal aspect and basic sequence For wiring Terminal board Section arranged as a local work Run/stop switch (to be  prepared locally) Alarm output (DC24V, less than 0.8A) Relay coil for DC24V, etc. (to be prepared  locally) (The relay coil is powered on in  case of alarm) Do not connect a LED or a ...
  • Page 36 2. Control Functions Control functions on the module b. Setting method N O T E • Do not bundle the additional wiring together with other control circuits, and in particular with wiring for 230V or 400V. • Put the additional wiring separately inside a metallic pipe, or use a shielded wire. SMGB0097 rev.0 - 07/2015...
  • Page 37 2. Control Functions Control functions on the module  Pulse input type 1 a. Signal aspect and basic sequence For wiring Terminal board Section arranged as a local work Run/stop switch (to be  prepared locally) Alarm output (DC24V, less than 0.8A) Relay coil for DC24V, etc. (to be prepared  locally) (The relay coil is powered on in  case of alarm) Do not connect a LED or a  relay of internal diode type. Time chart More than  More than  200ms 200ms Switch Keep more than 5  minutes Chiller  unit Stop N O T E Pulse input indicates an ON input of the same switch when changing the status of the chiller unit, as shown in the...
  • Page 38 2. Control Functions Control functions on the module b. Setting method Select "Pulse" N O T E • Do not bundle the additional wiring together with other control circuits, and in particular with wiring for 230V or 400V. • Put the additional wiring separately inside a metallic pipe, or use a shielded wire. SMGB0097 rev.0 - 07/2015...
  • Page 39 2. Control Functions Control functions on the module  Pulse input type 2 (external DC24V source) a. Signal aspect and basic sequence For wiring Remove (ON) signal (OFF) signal (OFF) (ON) Local works - parts to be arranged locally  (field supplied) Time chart More than 5 min More than 200 ms Stop Unit Stop b. Setting method Since it applies remote control, it is not required to change any settings at the LCD screen. N O T E • Do not bundle the additional wiring together with other control circuits, and in particular with wiring for 230V or 400V. •...

  • Page 40: Thermo Off Function Selection

    2. Control Functions Control functions on the module 2.1.15 Thermo OFF function selection This function prevents thermo OFF of the chiller unit due to sudden changes of temperature or flow. Example of standard settings: Inlet water temperature Outlet water temperature Setting temperature Thermo OFF temperature Stop with 10 continued seconds at thermo OFF temperature Example of thermo OFF judgement extension Inlet water temperature Outlet water temperature 10 minutes Does not stop immediately even if temperature becomes lower than  thermo OFF temperature Stop with 10 continued minutes  below thermo OFF temperature This function is used in cases in which the water flow is reduced temporarily, such as when opening and closing the valves  installed  in  the  water  piping  system,  or  when  switching  the  number  of  cold  (hot)  water  circulating  pumps  in  operation.  However, ...

  • Page 41: Selection Of Enabling/Disabling Of Alarm Release By Means Of Remote Stop

    2. Control Functions Control functions on the module  Mode selection method Select "10 minutes" 2.1.16 Selection of enabling/disabling of alarm release by means of remote stop The release of an alarm in case that the chiller unit has stopped due to an alarm is achieved by stop control (it is possible to  stop both from the stop button of the main unit or from remote stop control). But it is possible to configure this alarm release  to make it valid only from the stop button on the main unit (alarm cannot be released by remote stop control). This function  is valid for places where there is a remote device for automatic stop order when an alarm is emitted. Select dissable SMGB0097 rev.0 - 07/2015...

  • Page 42: Limitation Setting For Pump Feedback Waiting Time

    2. Control Functions Control functions on the module 2.1.17 Limitation setting for pump feedback waiting time Flow at the start of operation of the chiller unit ° Chiller Unit Operation Order Reception Waiting for Pump Feedback ¢ Interlock achieved In case that  setting time is Compressor operation after compressor delay £ exceeded time count Alarm Output § The flow in the upper figure is followed upon start of operation of the chiller unit.  The state of ¢ is kept in case that there is no input of pump feedback signal between ¢ and £, or when the difference  between inlet and outlet temperature of cold water is too large. This function shifts to § "Alarm" in case that the state of ¢...

  • Page 43: Inlet Water Temperature Thermo Off Function

    2. Control Functions Control functions on the module 2.1.18 Inlet water temperature thermo OFF function Normally thermo OFF judgement is carried out from outlet water temperature, but when enabling this setting, the judgement  of thermo OFF is carried out also from inlet water temperature. (Thermo OFF judgement by outlet water temperature is also  enabled)(Water temperature control is carried out from outlet water temperature even in case that this function is enabled ) It is effective when there is the need to set thermo OFF with the return water temperature from the load.  Setting method SMGB0097 rev.0 - 07/2015...
  • Page 44 2. Control Functions Control functions on the module Select "Enable" Display the input window with [INPUT] key Thermo ON conditions are the same as in  Input the setting value with up and down keys normal outlet water temperature control.  Confirm with [ENT] key It  is  possible  to  switch  the  setting  values  with  “2.1.11 2-temperature setting func- Cancel with [CAN] key tion”. SMGB0097 rev.0 - 07/2015...

  • Page 45: Control Of The Cooling Cycle

    2. Control Functions Control of the cooling cycle 2.2 Control of the cooling cycle 2.2.1 Compressor Control The compressor mounted on this product is equipped with a system to adjust the amount of discharge (slide valve). The  slide valve is installed on the screw rotor, and performs the adjustment of the amount of discharge with the change of  bypass amount by hydraulic activation. In the case of load up Cylinder part To suction side Discharge  Slide valve Suction Piston Rotor Spring Solenoid valve (203) Solenoid valve (202) To suction side Oil supply Solenoid valve (201) Oil supply In case of load down Cylinder part To suction side Bypass Discharge ...

  • Page 46: Expansion Valve Control

    2. Control Functions Control of the cooling cycle 2.2.2 Expansion Valve Control The expansion valve used in this product is an electronic expansion valve. The electronic expansion valve is composed by  the main unit and a coil. The control functions of the electronic expansion valve are as shown below. 1 Basic control  0 (zero) point adjustment Power ON 0 (zero) point adjustment is conducted as an initialization  (detection of base point) upon power ON. This control is   0 (Zero) point adjustment performed to make the control pulses recognized by the  microprocessor and the actual pulse number to match at  0,  by  outputting  a  full  closure  order  (under  0  pulse)  for  the  opening  of  the  expansion  valve.  During  execution,  Compressor startup the ...
  • Page 47 2. Control Functions Control of the cooling cycle 2 Protection controls The basic control follows the contents of section 1, but the following functions are also implemented for the protection  of the product. a. Low pressure over-increase prevention control In case of continued operation conditions of low pressure higher than 0.5 MPa, the valve is forced to close and  momentarily set somewhat close in comparison with the opening under normal control. b. Discharge gas superheat decrease prevention control During  normal  operation  (during  suction  gas  superheat  control),  in  case  of  continued  operation  conditions  of  discharge gas superheat temperature lower than 5ºC, the valve is forced to close and momentarily set somewhat  close in comparison with the opening under normal operation. c. Discharge gas temperature overheat prevention control In case of continued operation conditions of discharge gas temperature higher than 80ºC, overheating of discharge  gas temperature is prevented by controlling the opening so as to make discharge gas temperature become 75ºC. d. Evaporated gas temperature decrease prevention control In case of continued operation conditions of evaporated gas temperature (refrigerant inlet temperature of the water ...

  • Page 48: Overcurrent Protection Control

    2. Control Functions Control of the cooling cycle  Image diagram of 0 (zero) point adjustment If the compressor does not stop in 200 hours Restart after 3 minutes In superheat control Thermo OFF Thermo ON Time If more than 24 hours have passed since the last 0 (zero) point  Forced 0 (zero) point adjustment  adjustment, then 0 (zero) point adjustment is performed during  is performed Thermo OFF. 2.2.3 Overcurrent protection control There is a function to force unload in case that the upper limit of running current of the unit is about to be exceeded. It is  possible to change the setting value of overcurrent protection control from the "Service" menu.  Activation of overcurrent protection When the running current of the unit reaches the upper limit of running current, the power source capacity load is abated  by means of forced unload operation. (See figure below). Load ...

  • Page 49: Control Of Master/Slave Group

    2. Control Functions Control of Master/Slave group 2.3 Control of Master/Slave group 2.3.1 Summary of control of Master/Slave group In addition to the operation as a single chiller unit, this product allows the operation of multiple chiller units as a single heat  source system. 1 Features • The function to control the Master/Slave group comes equipped as standard, and thus an exclusive controller is not  necessary. • It is possible to connect up to 8 modules to 1 group. •...

  • Page 50: Operation Method

    2. Control Functions Control of Master/Slave group 2.3.3 Operation method One group composed of multiple modules using the functions to control the number of units is called a "system". 1 Operation Order (Required) Input "System Operation Order" for the chiller unit set as Unit 1.  It is also possible to put the system to operation from the "Local system operation switch" installed inside the electrical  box. Control board of unit number 1 System operation order switch (*)  System System operation Stop Stop order switch *System operation orders are level signals N O T E Pay attention to the fact that it is different from the Run/Stop Order (Terminal No.
  • Page 51 2. Control Functions Control of Master/Slave group 5 Remote Forced Stop (Alarm Reset) / System Recovery Wiring Connect to each chiller unit to force stop of a chiller unit in operation from a remote location, to reset an alarm, or to  return to the system a chiller unit that had been excluded from the target of the control of Master/Slave group. (When a  chiller unit is stopped because of an alarm, or by a forced stop order, it becomes excluded from the target of the control  of Master/Slave group (detached). It is necessary to perform system recovery operation in order to regain the target of  the control of Master/Slave group. Also, in case of using it to reset an alarm, it is necessary to enable the optional function (LCD screen setting) "Remote  stop reset" at each of the chiller units.  Remove the connection  System recovery signal between 5 and 6 Forced stop-Alarm reset signal (System recovery  (Forced stop signal) signal) (Alarm reset) More than 200ms More than 200ms Relevant Alarm Unit Stop Output Forced stop Alarm reset More than 200ms Detached ...

  • Page 52: Other Functions Of The Control Of Master/Slave Group

    2. Control Functions Control of Master/Slave group 6 External thermo operation Functions concentrated in unit 1 (master unit) By inputting the signal of the following wiring to unit 1, their settings become enabled for all the chiller units in the same  group. • 2-temperature setting • Night shift • Maximum current limitation 2.3.4 Other functions of the control of Master/Slave group 1 About Detachment Modules stopped by an alarm stop or by a forced stop during operation, as well as modules that have lost communication  with  Master  module,  become  excluded  from  the  target  of  the  control  of  Master/Slave  group.  (The  same  applies  for  Master module).
  • Page 53 2. Control Functions Control of Master/Slave group 5 Rotation Control When starting up the modules, the modules with the shortest operation time have priority. (Comparison is carried out  between units with the same priority order settings, though) When stopping modules, the modules with the longest  operation time have priority. If the operation with the minimum number of operating units continues for a long time,  forced rotation control is conducted. 6 Priority order setting It is possible to set the desired order of priority in operation, when there are machines with different capacities or when  inverter type and continuous control type are mixed together.  (Maximum 8 steps) Module Priority order setting In this case, module 1 is operated first, as it has the highest priority, and then a rotation control is performed among  modules 2 to 4, which have the same priority order. 7 Function to cancel the control of Master/Slave group It is possible to cancel the functions to control the number of units when simultaneous thermo ON/OFF of all the units  is required with without performing the control of Master/Slave group. (Possible in 1-pump systems only) N O T E Setting method: In 1-pump system settings, set both waiting time for effect of addition and waiting time for effect of reduction to "0".

  • Page 54: Setting Items

    2. Control Functions Control of Master/Slave group 2.3.5 Setting items Inlet water temperature § Number of Units at Startup Water temperature Sets  the  number  of  modules  to  be  started  up  upon  Addition ¥ system start-up. Addition  Maximum number of operating units Sets the upper limit of the number of modules that can  £ be operated at the same time. ¤ © Minimum number of operating units Sets the minimum number of modules to be operated at ...

  • Page 55: Method For Setting And Confirmation Of Operation Conditions Through The Lcd Screen

    2. Control Functions Control of Master/Slave group 2.3.6 Method for setting and confirmation of operation conditions through the LCD screen Conducts the setting of the control of Master/Slave group and confirmation of operation conditions through the LCD screen. In the case of master  In the case of slave unit  unit (unit 1) setting (units 2 to 8) setting Set the setting temperature difference (when the 1st water  temperature setting is enabled) Set the setting temperature difference (when the 2nd water  temperature setting is enabled) If there are more  than 5 units con- nected, shift to  priority setting screen of units after unit 5 SMGB0097 rev.0 - 07/2015...
  • Page 56 2. Control Functions Control of Master/Slave group [Status screen of the control of Master/Slave group] SMGB0097 rev.0 - 07/2015...

  • Page 57: Run Operation

    2. Control Functions Run operation 2.4 Run operation 2.4.1 Setting of switches on the setting PCB 1 Pump operation switch By  setting  the  switch  ON  while  the  module  is  stopped,  Pump Operation pump operation order is output. 2 Local / Remote switch Switches  whether  the  operation  control  of  the  module  Local is ...

  • Page 58: Operation Control Of The Module

    2. Control Functions Run operation 2.4.2 Operation control of the module 1 In the case of remote control Operation order Confirm that the cold water inlet/outlet valve is fully open Power ON Power ON the pump for cold water circulation Press the “Run” button Operation of pump for cold water circulation starts Operation of compressor starts after compressor delay time has passed Stop order Press the “Stop” button N O T E It is possible to stop the module by means of the stop switch in the Master module, even if it is in remote operation. It is also possible to stop by remote controller switch even during local operation.

  • Page 59: Time Chart

    2. Control Functions Time chart 2.5 Time chart Continous capacity control (Cooling operation) Power source Run control Control Stop control Protection Pump feedback device Common (Other than above) Thermo  Thermo  Load Power source display (Main unit) Pump operation Pump operation display (Remote) Operation display (Main unit) Operation display (Remote) Alarm display (Main unit) Alarm display (Remote) 0.6 s 0.6 s Contact for formation of self-holding Electronic expansion valve Compressor 6C Compressor 52C Compressor 42C Alarm display (Remote)
  • Page 60 3. Servicing S e r v i c i n g Index LCD display for Service Menu ....................... 57 General notes ............................65 Cycle components ..........................66 3.3.1 Compressor removal ............................. 66 3.3.2  Overhaul work ............................... 68 3.3.3  Recovering the refrigerant  ..........................70 3.3.4 ...
  • Page 61 3. Servicing 3.4.8  Overcurrent relay (ORC) ..........................85 3.4.9  Contactors (CMC, CMCD, CMCS) ........................ 86 3.4.10  Fuses (EF1, EF2, EF3. EFR, EFS, EFT) ....................86 3.4.11  Fuses (PFC) ..............................87 3.4.12 Relays ................................. 88 3.4.13  Main Switch ..............................89 SMGB0097 rev.0 - 07/2015...

  • Page 62: Lcd Display For Service Menu

    3. Servicing LCD display for Service Menu 3.1 LCD display for Service Menu INPUT SCREEN EXAMPLE (Latest version will be shown) (2 sec.) MAIN SCREEN MENU N O T E This screen will be shown after clicking on the INPUT button. Increases the value. Decreases the value Accepts the value Cancels the operation Pictogram description...
  • Page 63 3. Servicing LCD display for Service Menu  Auto expansion valve initialize SERVICE MENU SCREEN (1/2)  Superheat setting SERVICE MENU SCREEN (1/2) SMGB0097 rev.0 - 07/2015...
  • Page 64 3. Servicing LCD display for Service Menu  Expansion valve manual operation SERVICE MENU SCREEN (1/2)  Overcurrent protection setting SERVICE MENU SCREEN (1/2) SMGB0097 rev.0 - 07/2015...
  • Page 65 3. Servicing LCD display for Service Menu  Sensor adjust SERVICE MENU SCREEN (1/2) N O T E When a sensor is giving a different value than the actual value, a correction can be set. Example: Real temperature: 25.0º C Thermistor value: 24.0º...
  • Page 66 3. Servicing LCD display for Service Menu  Comp Hr Setting SERVICE MENU SCREEN (1/2) N O T E When PCBb is replaced, the previous information related to compressor operating time and number of restarts can be entered form the service menu ...
  • Page 67 3. Servicing LCD display for Service Menu  4-20 mA input SERVICE MENU SCREEN (/2)  Continuous control SERVICE MENU SCREEN (/2)  Order dissable SERVICE MENU SCREEN (/2) SMGB0097 rev.0 - 07/2015...
  • Page 68 3. Servicing LCD display for Service Menu  Default Set SERVICE MENU SCREEN (/2) N O T E • This function resets all data and returns to the initial values, except for the warning and alert history and accumulated operating time-period and operating time of the compressor. •...
  • Page 69 3. Servicing LCD display for Service Menu  Delete log SERVICE MENU SCREEN (/2) N O T E This function deletes the stored data concerning to the alarms and cautions. SMGB0097 rev.0 - 07/2015...

  • Page 70: General Notes

    3. Servicing General notes 3.2 General notes Before starting to remove any component, take into account the following notes: D A N G E R • Before performing any of the service operations described in this chapter, turn all the main switches off and place security lockers or convenient warning indicators in order to prevent them from turning on accidentally. •...

  • Page 71: Cycle Components

    3. Servicing Cycle components 3.3 Cycle components C A U T I O N • All operations in the refrigerant cycle require to collect the refrigerant. In those cases proceed as explained in”3.3.3 Recovering the refrigerant” D A N G E R Turn OFF all the power source switches and ensure that the module is totally stopped before to get inside.
  • Page 72 3. Servicing Cycle components a. Power supply wiring Power supply cable hose  (R, S, T) b. Control  wiring  connector  (QCN4)  and  Pd  and Ps cables (QCN13). Connector QCN13 Connector QCN4 6 Remove the 8 screws fixing the compressor. Un- Right side. From E Box screw the screws fixing  the structure (HEX10),  as shown in the picture Screws (x8) Left side. From E Box SMGB0097 rev.0 - 07/2015...

  • Page 73: Overhaul Work

    8 Use  a  portable  crane  or  a  lift  truck  to  remove  the  compressor:  Introduce  the  forks  under  the  compressor supports and gently pull backwards. C A U T I O N Compressor is heavy, two persons and a portable crane or similar are required. 3.3.2 Overhaul work Perform the work according to “Semi-hermetic Hitachi Screw Compressor Manual”. When removing a compressor from the refrigeration cycle, high pressure part shall be separated between the projecting  part flange of compressor and the upper cover of oil separator. Do not separate high pressure part between the check valve  and the projecting part flange of compressor, as collected refrigerant would be spilled out. High-pressure side Disconnect from this part Low-pressure side...
  • Page 74 3. Servicing Cycle components  Replacement of oil inside compressor To replace the oil of the compressor proceed as explained below: Collect all refrigerant as described in chapter “3.3.3 Recovering the refrigerant” 2 With a module capacity of 50~75%, perform the operation ensured by suction gas superheat for about 10 minutes, and  after recovering the refrigerant as explained in Recovery of refrigerant in the Installation and Operation manual, turn  power off and perform the following operation.  3 Oil extraction work Remove the plugs for oil extraction (A-B) at 2 places in screw compressor, and measure the amount of extracted oil. It  is not possible to extract the oil from the inside of compressor by just removing one plug, so always remove the 2 plugs. 4 Check of oil strainer Remove the oil strainer cover (C), and confirm the state of the internal oil strainer. In case of finding any abnormality  such as dirt or any damage, clean or replace the part as adequate. 5 Oil charge work Attach the oil strainer, the oil strainer cover (C) and the oil extraction plugs (A-B). Connect the charge hose to the check  joint (Discharge pressure outlet). Let the oil be absorbed by the charge hose while performing vacuum from the check  joint of the suction side. (Charge the amount of oil that had been extracted in the above point "Oil extraction work") 6 After completing the operation, perform vacuum again and charge refrigerant (check in the Installation and Operation  Manual, Maintenance chapter). N O T E •...

  • Page 75: Recovering The Refrigerant

    3. Servicing Cycle components 3.3.3 Recovering the refrigerant  With a vacuum pump a. Make sure that the system is powered off. b. Completely close the stop valve. c. Connect the vacuum pump system to the check joints of the refrigerant line. d. Check for any leakage at the flare nuts connections. e. Operate the vacuum pump for 1 or 2 hours, or until the pressure decreases lower than a pressure of 756 mmHg in  vacuum. f. Use a scale to take note of the quantity of refrigerant charged into the tank in order to provide the same quantity  when charging the circuit. Recovery tank RCME-CLH unit Vacuum pump Scale Manifold gauge 3.3.4 Replacement of the cooler 1 Unscrew the 4 screw of the refrigerant inlet pipe  flange and the 4 screws of the outlet refrigerant ...
  • Page 76 3. Servicing Cycle components 2 Remove  the  2  Victaluic  connections  from  the  water connections. Victaulic  connections 3 Screw eyebolts to both sides of the cooler to the  bolts  for  that  purpose.  Fasten  a  textile  belt  to  proceed to lift the cooler.  C A U T I O N Do not never use chains or metallic ropes to lift the cooler as they can damage it.

  • Page 77: Replacement Of Expansion Valve

    3. Servicing Cycle components 3.3.5 Replacement of expansion Valve 1 Collect  the  refrigerant  as  explained  in  section  “3.3.3 Recovering the refrigerant” 2 Firmly hold the coil of the expansion valve and    Expansion valve coil pull  out  upward.  It  is  easier  to  remove  the  ex- pansion valve coil if it is rotated while pulling it  Expansion valve 3 Remove the brazed parts using a blowtorch and ...

  • Page 78: Filter Drier

    3. Servicing Cycle components 3.3.6 Filter drier There are two possible main maintenance operations to do with the filter drier: the substitution of the inner core due to its  adsorption saturation or the substitution of the whole unit due to some damage.  Solid core substitution Follow the next steps in order to proceed to replace the inner core of the filter drier: 1 Remove the 8 screws (1) that fixes the top cov- er (2). Carefully, remove the spring (3), the top  cover gasket (4), the wing nut (5) and the lock  washer (6).  2 Retire the top plate (7) and then the felt gasket  3 Take  the  solid  core  (9)  out  and  proceed  to  the  replacement. 4 When  reassembling  after  replacing  the  solid  core, perform the procedure in the reverse order ...

  • Page 79: Replacement Of The Check Valve

    3. Servicing Cycle components 3.3.7 Replacement of the check valve The best way to replace the check valve is disassembling it from its location and later, unbrazing it from the pipes. Follow  the next steps for a correct disassembling: 1 Remove the thermistor (THMd). Thermistor  (THMd) a. Cut and remove the plastic bands that fixes  the insulation of the discharge pipe thermis- tor (THMd). b. Loosen the screw fixing the thermistor. c. Remove the thermistor. Plastic bands Screw 2 Remove the 4 screws of the inlet pipe flange. 3 Remoce the fixing clamp. Inlet pipe flange  4 Screws Fixing clamp 4 Remove the 4 screws that fixes the check valve  Allen screw (x4) to its location at the discharge outlet. 5 Remove the 4 Allen screws that fixes the cover  of the check valve.

  • Page 80: Replacement Of The Stop Valve (With Check Joint)

    3. Servicing Cycle components 3.3.8 Replacement of the stop valve (with check joint) 1 Remove the brazed parts using a blowtorch and  Stop valve Check joint previously  cooling  the  pipe  side  and  the  stop  valve unit with wet cloth in order to avoid braz- ing material enter inside the pipes. Brazed parts 3.3.9 Replacement of the high pressure switch (PSH) 1 Disconnect the cables (9 and 10 of the Pressure  High pressure  switch (PSH) Screw switch from the E-box of the compressor termi-...

  • Page 81: Replacement Of The Pressure Relief Valve

    3. Servicing Cycle components 3.3.12 Replacement of the pressure sensor (PS) 1 Disconnect the cables (7 and 8 of the pressure  sensor form the E-box of the compressor termi- nal board). 2 Unscrew the sensor and proceed to its replace- ment 3 When  reassembling  proceed  in  reverse  order  than removing. Pressure sensor (PS) 3.3.13 Replacement of the pressure relief valve 1 Remove  the  relief  valve  unscrewing  the  valve  with a spanner.

  • Page 82: Repalacement Of The Thermistor (Suction, Thms)

    3. Servicing Cycle components 3.3.16 Repalacement of the thermistor (Suction, THMs) 1 Remove the insulation of the suction pipe. 2 Loosen the screw fixing the thermistor. 3 At  the  E-box,  disconnect  the  CN27  contact  (or  the Faston terminals 7 and 8 of multiple contact  QCN3) 4 Remove the thermistor. Thermistor THMs 5 When reassembling after replacing the thermis- tor  (THMd),  perform  the  procedure  in  the  re- verse order than removing. Screw Suction pipe 3.3.17 Replacement of the thermistor (Discharge, THMd)

  • Page 83: Replacement Of The Thermistor (Evaporation, Thme)

    3. Servicing Cycle components 3.3.19 Replacement of the thermistor (Evaporation, THMe) 1 Cut  and  remove  the  plastic  bands  that  fixes  Thermistor THMe the  insulation  of  the  discharge  pipe  thermistor  (THMe). 2 Loosen the screw fixing the thermistor. 3 At  the  E-box,  disconnect  the  CN26TD  contact  (or  the  Faston  terminals  9  and  10  of  multiple  Evaporation pipe contact QCN3) 4 Remove the thermistor.

  • Page 84: Thermistor (Cooler Water Outlet, Thmwo2)

    3. Servicing Cycle components 3.3.21 Thermistor (Cooler water outlet, THMwo2) 1 Unscrew the nut of the cable gland 2 Gently pull the sensor wiring upwards. Thermistor (THMwo2 C A U T I O N Sensor sheath is full of sealing silicone. Use gloves and eye goggles for protection in order to avoid possible injuries to eyes and skin.

  • Page 85: Electrical Components

    3. Servicing Electrical components 3.4 Electrical components 3.4.1 The E-box 1 Turn  the  main  switch  off.  If  main  switch  is  not  turned off it is not possible to open the door. 2 Open the E-box door using the provided key for  electrical box cam locks. N O T E When the right door is open, the left one may eas- ily open by pulling backwards.

  • Page 86: Replacement Of Lamps And Push Buttons

    3. Servicing Electrical components 3.4.3 Replacement of lamps and push buttons Lamps and push buttons are placed in the left door of the E-box. To replace anyone of the open the E-box until get access  to the left door and proceed as follows:  Replacement of the lamps 1 Remove the wirings connected to the lamp hold- Phillips screws  (x2) er using a Phillips screwdriver. 2 Remove the nut fixing the lamp holder to the E- box door. 3 Replace  the  lamp  and  proceed  to  assembly  in  reverse order than removing  Replacement of the push buttons 1 Remove the wirings connected to the push but- Phillips screws ...
  • Page 87 3. Servicing Electrical components Second level components PCBc Electric transformer PCBa Fuses Relays  Access to second level electric components To have acces to the main control and power components of the unit into the E-box, follow the next steps: Fixation assembly 1 Firmly pull the plate 2 Pull until release the fixation  3 Keep pulling until the plate is in hor- assembly izontal at the top SMGB0097 rev.0 - 07/2015...

  • Page 88: Removal Of The Pcb's

    3. Servicing Electrical components Clamp lever 4 Push the clamp lever to fix the plate in horizontal position  at the top. 3.4.5 Removal of the PCB’s  PCBa 7- segment display Pressure switches (PSW) Plastic holder PSW1, PSW2 Switches (SW) Plastic holder SW1, SW2 Pressure switches (PSW) PSW3, PSW4 PSW5 PSW6 a. Remove  the  PCB  by  press- ing  the  expanded  part  of  the  4  Rotary switches ...
  • Page 89 3. Servicing Electrical components  PCBc Plastic holder a. Remove  the  PCB  by  pressing  the expanded part of the 4 plastic  holders,  using  long-nose  pliers,  as shown in the picture below. b. Pull  the  PCB  out  from  the  PCB  plate. Plastic holder  PCBd Plastic holder a. Remove  the  PCB  by  pressing  the expanded part of the 4 plastic  holders,  using  long-nose  pliers,  as shown in the picture below.

  • Page 90: Transformer (Tf1)

    3. Servicing Electrical components 3.4.6 Transformer (TF1) To have access to electrical transformer TF1, follow the steps described in “Second level components” in chapter “3.4.4 Access to electrical components” 1 Remove all the wirings corresponding to TF1. As shown  in the image. 2 Remove the 2 screws that fix the TF1 to the plate to CN1 to CN2A Screws (x2) 3.4.7 Transformers (TF2, TF3, TF4) To remove any of the TF2, 3 or 4, simply open left door of the E-box, and follow the next steps according to the transformer    to remove. 1 Remove all the wirings corresponding to the transformer  Screws to remove. (As shown the image) 1 Remove the 2 screws that fix the transformer to the plate. to PCN239 to CN56 to PCN238...

  • Page 91: Contactors (Cmc, Cmcd, Cmcs)

    3. Servicing Electrical components 3.4.9 Contactors (CMC, CMCD, CMCS) C A U T I O N In RCME-WH units, contactors are used for the delta start automation. Take note where each cable is connected in order to avoid any mistake when reassembling. An incorrect connection may result in a compressor damage. To proceed to the removal of contactors, follow the steps described below.

  • Page 92: Fuses (Pfc)

    3. Servicing Electrical components 3.4.11 Fuses (PFC)  Removal of the fuses Once the damaged fuse is detected proceed to its replacement following the next steps: 1 Open the plastic cover that protects the fuse 2 Take the fuse puller tool.  a. Push the red button. b. Slide the fuse puller tool up or down. c. Pull the fuse puller backwards. 3 On the damaged fuse, put the fuse puller tool and firmly  push to fix the tool on the fuse. Once the fuse is trapped  pull the tool backwards. SMGB0097 rev.0 - 07/2015...

  • Page 93: Relays

    3. Servicing Electrical components  Removal of the PFC fuse holder In case the fuse holder has suffered any damage and replacement is needed, follow the step described below. 1 Pull the fuse housing backwards.  2 Remove the Hex screws and wiring. PFC3-5 PFC1-1 PFC2-3 3 Remove the Phillips screws and replace the fuse holder. 2 Phillips  3+3 Flat screw driver  screwdriver or 13mm spanner PFC1-2 PFC2-4 PFC3-6 4 When reassembling, perform the procedure in the reverse order than removing. 3.4.12 Relays To remove any of the relays, proceed as follows: 1 Detach the Faston terminal from its connection Phillips screws (x2) 2 Remove the 2 screws fixing the relay to the plate. 3 Replace the relay.

  • Page 94: Main Switch

    3. Servicing Electrical components 3.4.13 Main Switch To remove the main switch, follow the next steps 1 Turn the switch of in order to be able to open the E box  MIT/L3 MIS/L2 MIR/L1 door 2 Open the E-box door. 3 Remove the wiring. Unscrew the nuts from the terminals  4 flat screws with a 13 mm spanker. 4 Remove the 4 screws with a flat screwdriver. 5 When  reassembling,  proceed  in  the  reverse  order  than  removing. MIT/L3 SMGB0097 rev.0 - 07/2015...
  • Page 96 4. Troubleshooting T r o u b l e s h o o t i n g Index 4.1  Inspection of power source and connections ..................92 4.2  Inspection of PCB..........................93 4.3  Confirmation of operating value of protection devices and automatic operation devices ..... 93 Protection control function ........................94 Caution indication ..........................95 Summary of fault diagnosis ........................96 4.7 ...

  • Page 97: Inspection Of Power Source And Connections

    4. Troubleshooting Inspection of power source and connections 4.1 Inspection of power source and connections In case that there is any abnormality in the activation of the chiller unit, first perform the following check. Check Item Inspection Method Examine the secondary voltage of the breaker and the passage of electric  Is the power source breaker or the fuse broken? current through the fuse with a tester. Remove the connection of the secondary side of the transformer, and  measure the (AC) voltage with a tester. Confirm that the voltage shown on  the transformer is being output. Internal transformer of the unit White 30.0 Ｖ Blue At rated 230Ｖ 15.5 Ｖ load Blue Orange 16.1 Ｖ Orange P C N2 A (C P U  ...

  • Page 98: Inspection Of Pcb

    4. Troubleshooting Inspection of PCB 4.2 Inspection of PCB The standard setting of switches, etc., on the PCB is as Control System chapter in the Installation and Operation Manual.  Confirm that they are being set correctly.  4.3 Confirmation of operating value of protection devices and automatic operation devices The activation values of protection devices are as follows: Name Operating value 2.02MPa High pressure (Manual recovery) 0.13MPa or below Low/High pressure interruption device (Electronic control) Low pressure 0.01MPa or below (Electronic control) 230V Type 400V Type RCME-40WH 100A Overcurrent relay (for compressor) RCME-50WH 130A RCME-60WH 160A...

  • Page 99: Protection Control Function

    4. Troubleshooting Protection control function 4.4 Protection control function This Chiller unit is provided with protection control functions to release abnormal statuses before reaching alarm because  of abnormality occurrence. Name of Display protection control Conditions for Operation Description of Control Release conditions (Compressor frequency control) Segment  I1 < Setting  I1 > Setting value×0.97 Overcurrent  value×0.95  Load up prohibition Current protection...

  • Page 100: Caution Indication

    4. Troubleshooting Caution indication 4.5 Caution indication In case of occurrence of sensor abnormalities while the chiller unit is stopped, or of abnormalities that would not trigger an  alarm stop, a warning is output to the outside and warning display is conducted. The mark   is shown on the LCD Screen  during warning external output.  The content of warning is shown in the table below. Warning icon is Spanner mark shown Caution is illuminated Warning contents display Yellow during  occurrence of warning Warning indication Contents of warning Notes When compressor is stopped while  Freeze prevention Water temperature is 1ºC or below the chiller unit is in operation *1 Inlet water temperature thermistor  Disconnection or short-circuit of the inlet water  When the chiller unit is stopped *2 abnormality (CN4) temperature thermistor Outlet water temperature thermistor ...

  • Page 101: Summary Of Fault Diagnosis

    4. Troubleshooting Summary of fault diagnosis 4.6 Summary of fault diagnosis 1 Alarm In case of an alarm, the alarm light at the remote side and the alarm light on the display PCB of the main unit become  illuminated, and the background of the LCD Screen of the main unit side becomes red. In case of stopping a unit in which  an alarm has occurred, perform a stop operation instead of turning power OFF. Alarm occurrence LCD Display: Shows the details  Remote operation display lamp: Lit ON (Background colour turns red) Alarm display lamp: Lit ON Remote alarm display lamp: Lit ON Faulty PCB segment: Abnormality code (Remote side) Stop control Checked the details of  abnormality in “Status” screen? Abnormality code is shown  in “History” screen Check details of abnormality  of LCD part Check data stored  immediately before alarm occurrence Processing position of the  alarm part N O T E •...
  • Page 102 4. Troubleshooting Summary of fault diagnosis 2 Caution  Abnormalities that are not a hindrance for operation, but could lead to serious failure if neglected, are output as warnings. Caution occurrence Remote caution display lamp: Lit ON LCD Display: Show  mark (Remote side) Confirmation of details of abnormality in “Status”  screen Processing position of the caution part 3 Troubleshooting of the LCD Screen In case that the screen does not proceed further from the display of the following figure  on the below upon power ON, it  is because transmission between the LCD Screen and the CPU PCB is not taking place.  • Check wiring between the LCD Screen and the CPU PCB • Check wiring between the CPU PCB and transformer Transition of the LCD Screen upon power ON   SMGB0097 rev.0 - 07/2015...

  • Page 103: Method For Fault Diagnosis

    4. Troubleshooting Method for fault diagnosis 4.7 Method for fault diagnosis Summary of checks for fault diagnosis Check the power Is 400V supplied to the unit? source switch Is 230V supplied to Is fuse broken? Replace fuse transformer (TF ) primary side? Is R phase or S phase Replace transformer failure? Wiring check.

  • Page 104: Troubleshooting By Alarm Code

    4. Troubleshooting Troubleshooting by alarm code 4.8 Troubleshooting by alarm code C1-H1 Alarm code High Pressure Switch Alarm stop reason Discharge pressure (Pd) increases up to 2.02MPa, activating high pressure switch (63H). PCB monitoring position PCBd (I/O PCB) PCN204 (High pressure interruption device (63H)) High pressure  Operation control results  Press the reset button of  switch (63H) is being  in immediate alarm high pressure switch reset The connection and  insertion of connector Revision of connections PCN204 to PCBd (I/O  PCB) are correct Remove the wires  Check of high pressure  inserted in PCN204 switch (63H) (Internal ...
  • Page 105 4. Troubleshooting Troubleshooting by alarm code C1-h1 Alarm code Discharge pressure over-increase Alarm stop reason Discharge pressure (Pd) becomes higher than 1.92MPa for more than 10 seconds. (Enabled for electronic control) N O T E Causes alarm stop with 3 occurrences in 30 minutes. Retry control is performed until the second one. (Compressor stops, and restarts automatically after 3 minutes) Retry indication LCD: By touching “Inspection”, “Pd Retry” is shown in “No.1 Cycle”. ...
  • Page 106 4. Troubleshooting Troubleshooting by alarm code C1-L1 Alarm code Low pressure interruption control Alarm stop reason Suction pressure (Ps) becomes lower than 0.14MPa for more than 90 seconds. (Electronic control, only enabled in cooling) N O T E Causes alarm stop with 3 occurrences in 30 minutes. Retry control is performed until the second one. (Compressor stops, and restarts automatically after 3 minutes) Retry indication LCD: By touching “Inspection”, “Ps Retry” is shown in “No.1 Cycle”. ...
  • Page 107 4. Troubleshooting Troubleshooting by alarm code C1-51 Alarm code Compressor overcurrent Alarm stop reason The running current for one compressor is increased above the value for activation of the overcurrent relay, thus activating  the (thermal) overcurrent relay.  PCB monitoring position PCBd (I/O PCB) PCN206 Operation control  Overcurrent relay  results in immediate Press the reset button of  (51C1) is being reset activation of alarm the overcurrent relay Remove the  wiring inserted into  Check of wiring  connector PCN206 on (disconnection)  (I/O PCB) and mesure  conductivity. Is there  conductivity? Check of overcurrent relay  (internal disconnection) Check of PCB  (I/O PCB) I/O PCB is normal Overcurrent relay ...
  • Page 108 4. Troubleshooting Troubleshooting by alarm code C1-61 Alarm code Discharge gas temperature increase Alarm stop reason 1 Temperature of refrigerant discharged from Compressor rises up to 130ºC for more than 1 minute.  2 During count of point 1, temperature rises even more, above 140ºC for more than 3 seconds.  N O T E In the case of point 1, it causes alarm stop with 3 occurrences in 90 minutes. Retry control is performed until the second one.
  • Page 109 4. Troubleshooting Troubleshooting by alarm code C1-71 Alarm code Compressor Internal Thermo Activation Alarm stop reason Compressor motor overheats, activating internal thermo. (Activation point: 115ºC) N O T E Causes alarm stop with 3 occurrences in 30 minutes. Retry control until the second one (Compressor stops, and restarts automatically once de thermostat returns to a normal operation temperature) Retry indication LCD: By touching “Inspection”, “49C Retry” is shown in “No.1 Cycle”. ...
  • Page 110 4. Troubleshooting Troubleshooting by alarm code C1-91 Alarm code Cooler Inlet Decrease Alarm stop reason Inlet refrigerant temperature of the heat exchanger (Te) becomes lower than -6.5ºC for more than 3 seconds. (only enabled  in cooling). N O T E Causes alarm stop with 3 occurrences in 30 minutes. Retry control is performed until the second one. (Compressor stops, and restarts automatically after 3 minutes) Inlet refrigerant temperature of the heat exchanger (Tr) becomes lower than -35ºC for more than 10 seconds. (only enabled ...
  • Page 111 4. Troubleshooting Troubleshooting by alarm code C1-t1 Alarm code Suction gas decrease Alarm stop reason Temperature of refrigerant suctioned into compressor (Ts) falls below -5ºC for more than 10 seconds. N O T E Causes alarm stop with 3 occurrences in 30 minutes. Retry control is performed until the second one. (Compressor stops, and restarts automatically after 3 minutes) Retry indication LCD: By touching “Inspection”, “Ts Retry” is shown in “No.1 Cycle”. ...
  • Page 112 4. Troubleshooting Troubleshooting by alarm code 13-13 Alarm code Freeze protection · Freeze prevention C1-13 Alarm stop reason Cold water temperature falls below 1ºC. PCBc (CPU PCB) PCN12 short line is disconnected N O T E • In case of detection by inlet water temperature thermistor or in case of detection by disconnection of PCN12 short line “13-13” • In case of detection by outlet rear thermistor (for protection) or outlet water temperature thermistor (for control) “C1-13” PCB monitoring position PCBc (CPU PCB) CN4 (Inlet water temperature thermistor (Twi)), CN5 (Outlet water temperature thermistor (for water ...
  • Page 113 4. Troubleshooting Troubleshooting by alarm code 14-14 Alarm code Hot Water Over-Increase C1-14 Alarm stop reason Outlet water temperature exceeds 62ºC during compressor operation.  PCBc (CPU PCB) PCN13 short line is disconnected N O T E “14-14” in case that PCN13 short line is disconnected “C1-14” in case of detection by outlet water temperature thermistor PCB monitoring position PCBc (CPU PCB) CN5 (Outlet water temperature thermistor Two1(for water temperature control)) PCBc (CPU PCB) PCN13 (Short line) Outlet water ...
  • Page 114 4. Troubleshooting Troubleshooting by alarm code C1-21 Alarm code Cooler inlet THM abnormality (CN29) Alarm stop reason Thermistor for detection of inlet refrigerant temperature (Te) at the heat exchanger indicates an abnormal value.  PCB monitoring position PCBd (I/O PCB) CN29 (Cooler inlet thermistor (Te)) N O T E Refer thermistor characteristics chapter The connection and  insertion of connector Correction of CN29 on PCBd (I/O PCB)  connections are correct Remove the  connectors and measure thermistor resistance.  Replace thermistor Is resistance value normal? Replace PCBC (I/O PCB) ...
  • Page 115 4. Troubleshooting Troubleshooting by alarm code C1-24 Alarm code Liquid THM abnormality (CN24) Alarm stop reason Thermistor for detection of heat exchanger outlet (Tl) temperature indicates an abnormal value.  PCB monitoring position PCBd (I/O PCB) CN24 (Liquid thermistor (Tl)) N O T E Refer thermistor characteristics chapter The connection and  insertion of connector Correction of connections CN24 on PCBd (I/O PCB)  are correct Remove he  connectors and measure thermistor resistance.  Replace thermistor Is resistance value normal? Replace PCBd (I/O PCB) ...
  • Page 116 4. Troubleshooting Troubleshooting by alarm code C1-26 Alarm code Suction Gas THM Abnormality (CN27) Alarm stop reason Thermistor for detection of temperature of gas suctioned (Ts) by compressor indicates an abnormal value. PCB monitoring position PCBd (I/O PCB) CN27 N O T E Refer thermistor characteristics chapter. The connection and  insertion of connector Correction of connections CN27 on PCB  (I/O PCB)  are correct Remove the  connectors and Replace thermistor measure thermistor resistance.  Is resistance value normal? Replace PCB (I/O PCB) ...
  • Page 117 4. Troubleshooting Troubleshooting by alarm code C1-27 Alarm code Discharge Pressure Sensor Abnormality (CN31) Alarm stop reason Discharge pressure sensor (Pd) of compressor indicates an abnormal value. PCB monitoring point PCBd (I/O PCB) CN31PD (Discharge pressure sensor (Pd)) N O T E Refer pressure sensor characteristics chapter. The connection and insertion of connector  Revision of connections CN31Pd on PCBd (I/O PCB) are correct DC5V is being supplied between pin 1 and pin  Replace PCBd (I/O PCB)  3 of connector CN31Pd on PCBd (I/O PCB) Is the voltage between pin 2 and pin 3  of connector CN31Pd on PCBd (I/O PCB)  Replace PCBd (I/O PCB)  lower than DC0.5V or higher than DC4.5V when  discharge pressure sensor is connected? Elimination of the factors  There is clogging inside the connection pipe of  for clogging inside the  discharge pressure sensor pipe Replacement of discharge pressure ...
  • Page 118 4. Troubleshooting Troubleshooting by alarm code C1-28 Alarm code Suction pressure sensor abnormality (CN32) Alarm stop reason Suction pressure sensor (Ps) of compressor indicates an abnormal value.  PCB monitoring position PCBd (I/O PCB) CN32PS (Suction pressure sensor (Ps)) N O T E Refer pressure sensor characteristics chapter. The connection and insertion of connector  Revision of connections CN32Ps on PCBd (I/O PCB) is correct DC5V is being supplied between pin 1 and pin  Replace PCBd (I/O PCB)  3 of connector C32Ps on PCBd (I/O PCB) Is the voltage between pin 2 and pin 3  of connector CN32Ps on PCBd (I/O PCB)  Replace PCBd (I/O PCB)  lower than DC0.5V or higher than DC4.5V when  discharge pressure sensor is connected? Elimination of the factors  There is clogging inside the connection pipe of  for clogging inside the  discharge pressure sensor pipe Replacement of discharge pressure ...
  • Page 119 4. Troubleshooting Troubleshooting by alarm code C1-39 Alarm code Current sensor abnormality (CN36) Alarm stop reason Current sensor indicates an abnormal value (CT).  PCB monitoring position PCBd (I/O PCB) CN36 (Current sensor (CT)) The connection and insertion of connector  Revision of connections CN36 on PCBd (I/O PCB) is correct The connection and insertion of the  connector of current sensor on the body of the  Revision of connections unit are correct The power wiring of compressor passes  Revision of wiring through the current sensor There are no changes to the characteristics  Check of current sensor  of the current sensor (The characteristics of the  specifications. Check of  current sensor differ in standard specification and  DIP switches special voltage specification) Replacement of current sensor C1-03 Alarm code...
  • Page 120 4. Troubleshooting Troubleshooting by alarm code 03-03 Alarm code CPU—I/O transmission Alarm stop reason Transmission is not performed correctly between CPU PCB(PCBc) and I/O PCB (PCBd).  PCB monitoring position PCBc (CPU PCB) CN1~PCBd (I/O PCB) CN21 (H-LINK transmission) DSW1-5,6# of  Set DSW correctly and PCBa (Setting PCB)  reactivate power supply are correctly set DSW2-1,2# of  Set DSW correctly and PCBd (I/O PCB) are  reactivate power supply correctly set Terminal resistance correctly Set DSW correctly and set. Either DSW8-1# of ...
  • Page 121 4. Troubleshooting Troubleshooting by alarm code 01-01 Alarm code Startup Circuit Failure Alarm stop reason Startup circuit fails to self-hold after reception of operation signal, or upon automatic recovery from instant power failure. PCB monitoring position PCBc (CPU PCB) PCN15,PCN17 The connection and insertion of connector  Revision of connections PCN15 on PCBc (CPU PCB) is correct The connection and insertion of connector  Revision of connections PCN17 on PCBc (CPU PCB) is correct The insertion of the terminal of relay XR is  Revision of connections correct Replace relay XR 05-05 Alarm code Reverse/Open Phase Alarm stop reason Power source connected locally is connected in reverse or in open phase. ...
  • Page 122 4. Troubleshooting Troubleshooting by alarm code 11-11 Alarm code Inlet water temperature abnormality (CN4) Alarm stop reason Thermistor for detection of inlet water temperature (Twi) indicates an abnormal value. PCB monitoring position PCBc (CPU PCB) CN4 (Inlet water temperature thermistor (Twi)) N O T E Refer thermistor characteristics chapter. The connection and insertion of the connector  Revision of connections CN4 on PCBc (CPU PCB) is correct Remove the connector and measure the resist- Replacement of thermistor ance value. Is the resistance value normal? Replacement of PCBc  (CPU PCB) 12-12 Alarm code Outlet water temperature THM abnormality (CN5) C1-12 Alarm stop reason Thermistor for detection of outlet water temperature (for water temperature control Two1) indicates an abnormal value.
  • Page 123 4. Troubleshooting Troubleshooting by alarm code 2C-2C Alarm code Water supply header temperature thermistor abnormality. (CN13) Alarm stop reason Thermistor for detection of  indicates an abnormal value. water supply header temperature The connection and  insertion of connector Revise connections CN13 on PCBc (CPU PCB)  are correct Remove the  connectors and measure thermistor  Replace thermistor resistance. Is resistance value normal? Replace PCBc  (CPU PCB) 2d-2d Alarm code Water return header temperature thermistor abnormality. (CN14) Alarm stop reason Thermistor for detection of ...
  • Page 124 4. Troubleshooting Troubleshooting by alarm code SP-SP Alarm code Pump Interlock Abnormality Alarm stop reason • Pump operation feedback signal turns OFF while Pump operation signal (Y52P1) is ON.  N O T E It is enabled after establishment of interlock. • Pump operation feedback signal is not input within the time defined at "Waiting time for pump feedback" in optional  functions. Or in case that Cold (hot) water inlet/outlet temperature differential exceeds 1.5ºC, and water conduction  conditions have not been confirmed. PCB monitoring position PCBc (CPU PCB) PCN5 (PCB is normal) The overcurrent  230V are being supplied between pin 1 and pin  relay for the pump  Examination of pump lock 3 of connector PCN5 on PCBc (CPU PCB) (51P) is activated Examination of pump...
  • Page 125 4. Troubleshooting Troubleshooting by alarm code 40-40 Alarm code Incorrect Setting Alarm stop reason  The settings of the DIP switch are unrecognisable. The DIP switches of each PCB are set  Set DIP switches correctly  correctly and reactivate power The contacts of DIP  The DIP switch settings are recognized  switches on the setting  as correct by switch setting check “SERVICE  PCB are defective.  MENU” Replace setting PCB Check PCB  (CPU PCB) 40-40 Alarm code Incorrect operation Alarm stop reason A forbidden operation is performed during operation. Changed settings from  Conducting this operation ...
  • Page 126 4. Troubleshooting Troubleshooting by alarm code 40-40 Alarm code Incorrect Setting of control of Master/Slave group Alarm stop reason  The settings of the DIP relative to the function to control the number of units switch are unrecognisable.  PCB monitoring position PCBa (Setting PCB) DSW3-1~3, DSW6-1~3 PCBa (Setting PCB) RSW1 The rotatory switches of PCBA (Setting PCB)  Set the number of  of master module are correctly set connected units correctly The DIP switches on PCBA (Setting PCB) of  Set the DIP switches  each module are correctly set correctly The H-LINK transmission wiring between  master module and slave modules is Check wiring disconnected or connected wrongly Check PCBc (CPU PCB)
  • Page 127 4. Troubleshooting Troubleshooting by alarm code 40-40 Alarm code Transmission abnormality (Miswiring) Alarm stop reason The  connection  of  wiring  for  transmission  between  modules  (Transmission  line  between  master  and  slaves)  and  the  transmission wiring for connection of group controller is mixed.  Retry indication No retry PCB monitoring position PCBc (CPU PCB) CN2 (Transmission port between modules)  PCBc (CPU PCB) CN300 (Transmission port for group controller) The connection of  Connect transmission wiring  transmission wiring is  correctly correct Check PCBc (CPU PCB) 6E-6E Alarm code...

  • Page 128: Analysis And Countermeasure Of Abnormalities

    4. Troubleshooting Analysis and countermeasure of abnormalities 4.9 Analysis and countermeasure of abnormalities Phenomenon Cause Check Item Action · Countermeasure Power failure Measure voltage with a tester Wait for power return Power is not coming in Check main power switch Turn main power switch ON Replace fuse after correcting Short circuit between wires Check wire coating damage short circuit Power  Ground fault (Earth) of  Replace fuse after correcting Measure insulation resistance source wiring ground fault...
  • Page 129 4. Troubleshooting Analysis and countermeasure of abnormalities Phenomenon Cause Check Item Action · Countermeasure Bad connection of wiring Check connection with a tester Correct wiring connection Pump is Faulty PCB operating, but    Check connection with a tester Faulty PCB Replace PCB compressor is Check PCB with self-diagnosis not operating. Operation is possible by activation  Replace remote control Failure of remote control switch from the main unit side switch Bad connection of wiring Check connection with a tester Correct wiring connection Faulty PCB Faulty PCB Defective thermistor Measure resistance of thermistor...
  • Page 130 4. Troubleshooting Analysis and countermeasure of abnormalities Phenomenon Cause Check Item Action · Countermeasure Malfunction of check valve Replace check valve Suction gas temperature is Clogging of expansion valve Remove clogging too high (excessive super  Discharge  heat) gas over- increase is Malfunction of the expansion valve Replace expansion valve activated Failure of thermistor for  Replace thermistor for  Check connection with a tester control of discharge gas control of discharge gas Replace electromagnetic...
  • Page 131 4. Troubleshooting Analysis and countermeasure of abnormalities Phenomenon Cause Check Item Action · Countermeasure Set the machine to a larger  Load bigger than cooling capacity. Calculate heat load. capacity Gas leakage or insufficient  Charge correct refrigerant volume  Check super heat amount of refrigerant after checking gas leakage Suction Clogging of expansion valve Check for clogging Remove clogging pressure is Malfunction of the expansion  Check operation of expansion  too low.  Replace expansion valve valve valve Check whether there is temp ...

  • Page 132: Thermistor Characteristics

    4. Troubleshooting Thermistor characteristics 4.10 Thermistor characteristics The thermistor is installed in this product to detect the cycle temperature such as water temperature (inlet-outlet of water  side heat exchanger), and outlet liquid refrigerant temperature from the heat exchanger. The thermistor temperature characteristics are shown in the below figures: 4.10.1 Thermistor temperature characteristics (All temperature except discharge gas) 19,3 14,4 10,9 2,5 2,0 1,6 1,3 1,1 0,9 0,7 0,6 0,5 0,4 0,4 0,3 -20 -15 -10 -5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 17B18890 Temperature (ºC) 4.10.2 Thermistor temperature characteristics for discharge gas temperature...

  • Page 133: Pressure Sensor Characteristics

    4. Troubleshooting Pressure sensor characteristics 4.11 Pressure sensor characteristics 4.11.1 High-pressure sensor (Mpa) 4.11.2 Low-pressure sensor (0.3) (-0.1) (Mpa) 4.12 Procedures for trouble The following table shows efficient checking procedures for trouble. Fault Possible Cause Check/Corrective Action 1.    C heck the pump contactor. Repair or replace, if  necessary. Interlock Circuit for Chilled Water Pump is Open 2.  Check for the faulty pump. Compressor does not Remove the causes, and reset the “ON” button.  operate Electrical Protective Devices Are Tripped. See the following causes.
  • Page 134 4. Troubleshooting Procedures for trouble The following table shows efficient checking procedures for trouble. Fault Possible Cause Check/Corrective Action Check for excessively low setting of the chilled  Excessively Low Chilled water Outlet Temperature water setting knob. Compressor stops Check for malfunction of the thermistor. Replace, if  Defective Thermistor on freeze protection necessary. control. Shortage of Chilled Water Flow Check the rotation of the pump. Air in water Circuit Purge air. Check the power supply line and contactor. Repair,  High or low voltage, single-phase or phase imbalance if necessary. Compressor stops on Excessive Superheat Check for refrigerant leakage. internal thermostat  Check the contact of the internal thermostat during  or discharge gas  Defective Element the cold condition.
  • Page 137 Hitachi Air Conditioning Products Europe, S.A.U. Ronda Shimizu, 1 - Políg. Ind. Can Torrella 08233 Vacarisses (Barcelona) España Hitachi certifies that our products have met EU consumer safety, health and environmental requirements. Hitachi Air Conditioning Products Europe, S.A.U. is certified with:...

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