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Gattetti LCA User Manual

Water chillers and heat pumps
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LCA - LCW - LCR
Water chillers and heat pumps USER MANUAL
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Summary of Contents for Gattetti LCA

  • Page 1 LCA - LCW - LCR Water chillers and heat pumps USER MANUAL...

  • Page 2: Table Of Contents

    INDICE Introduction ........................3 General Description.......................3 Functions ..........................3 Main Board..........................3 Second compressor board...................... 4 User Interface (Terminal)....................5 Status of the unit ........................5 Keypad............................ 6 Buttons and relative messages on display................6 Functions of the buttons (for panel-mounted versions)............10 Functions of the buttons (wall-mounted units) ..............

  • Page 3: Introduction

    1 Introduction "µchiller" is a Carel's regulator that integrates into just one case all the control functions required by an air-conditioning unit. "µchiller" is a complete, reliable and solid instrument. Thanks to its modular structure it provides a wide range of flexible applications.

  • Page 4: Second Compressor Board

    Within the board itself you can also locate other four important areas: • the SERIAL jumper for connection of an optional serial board for the interfacing to a supervisory and/or telemaintenance centralized system • the KEY jumper for connection of the optional board removable hardware key for the immediate on site programming of all data •...

  • Page 5: User Interface (Terminal)

    3 User Interface (Terminal) The terminal allows the access to the data of the unit. The terminal can be supplied either in panel-mounting version or, for remote connection, in wall-mounting version . On the terminal there are 5 LED indicators to indicate the status of the unit (Cooling/Heating), the status of the compressors (ON/OFF) and the timer for compressors/pump after 100 operating hours.

  • Page 6: Keypad

    3.2 Keypad The keypad allows to set the function parameters of the unit. In the wall-mounting remote version, it is composed of several buttons to easy the use. The performance functions of each button will be indicated here below. 3.3 Buttons and relative messages on display Setting and displaying the set point and the main control parameters (DIRECT parameters).
  • Page 7 Setting and displaying FACTORY-SET parameters Factory-set parameters are configuration parameters and so they are protected by a password to prevent any unauthorized access to the data. Press PRG and SEL simultaneously for more than 5 seconds to enter the factory-set parameters (unit configuration parameters) menu.
  • Page 8 Forcing a DEFROSTING CYCLE (only Air/Water Heat Pumps) To force a defrosting cycle press the SEL and buttons for more than 5 seconds (if the temperature/pressure values of the outdoor exchanger are lower than the values set for the end of defrosting). In units with 2 Circuits the defrosting cycles will be simultaneous.
  • Page 9 Reset timers When the display shows the operating hours of the compressor or of the pump (parameters c9, cA and cC), you can reset the timer by pressing the buttons (and the CLEAR button in wall-mounted versions). In this case the unit will not prompt the relative compressors maintenance message.

  • Page 10: Functions Of The Buttons (For Panel-Mounted Versions)

    Regulating the contrast on the display (This procedure can be effected only on Remote terminals for wall-mounted versions - optional). Press the button as shown in the picture to regulate the contrast of the display on three different levels (in a cyclic way). 3.4 Functions of the buttons (for panel-mounted versions) The table below shows the meaning and functions of the buttons.

  • Page 11: Inputs And Outputs

    Button Status of the unit Effect after pressing the button List of codes displays the codes of the parameters Displays values increases value List of codes displays the codes of the parameters Displays values decreases value PRG + SEL Normal operating condition after 5"...

  • Page 12: Parameters

    4 Parameters There are 3 groups of parameters: directly accessible DIRECT (D): accessible via password (22) USER (U): accessible via factory-set password FACTORY (F): The presence of certain parameters in the various groups (probe, controller, compressor, etc.) depends on the type of the controller and on the value given to some specific parameters: controller for two-compressor units (B= in two-compressor units only)
  • Page 13 Galletti Regulator Type Min. M.U. Variation Presence Default Water temp. at output circuit 1 °C/°F ----- evap. (B2) Water temp. at output circuit 2 °C/°F ----B evap. (B4) Defrosting °C/°F ---S- temperature/pressure (B3) Defrosting °C/°F ---SB temperature/pressure (B5) Min. Cooling set-point °C/°F ----- Max.
  • Page 14 Galletti Type Min. Max. M.U. Var. Presence Def. - Temperature value for min Winter °C -V-S- speed °F - Pressure value for min Winter speed - Temperature value for max Winter °C -V-S- speed °F - Pressure value for max Winter speed - Temp.
  • Page 15 Galletti Antifreeze Type Min. M.U. Variation Presence Def. 19.8 °F Supporting heaters probe flag ----- Galletti Alarm Type Min. M.U. Variation Presence Def. Flow switch alarm delayed when starting ----- the pump Flow switch alarm delayed during normal ----- operating Low pressure alarm delayed at compr.

  • Page 16: Parameters Description

    4.1 Parameters description Password USER: To gain access to the USER parameters, press the PRG button for 5 seconds. Then, insert the USER password (22) and finally press SEL. FACTORY: To gain access to the FACTORY-set parameters press PRG and SEL together for 5 seconds. Digit the password (available on request), then press SEL.
  • Page 17 /9: Calibration of evaporator outlet water probe at circuit no.2, B4 It allows to add an offset to the value measured by B4. /A: Calibration of condensation probe circuit no. 2, B5 It allows to add an offset to the value measured by B5. /b: Digital filter It allows to calculate the coefficient relative to the digital filter of the measured value.
  • Page 18 In capacity-controlled compressors, the functioning logic is as follows: Request Compressor contactor Partialization solenoid valve Start-up: disenergized disenergized Capacity-controlled energized energized Full load energized disenergized OFF routine: Full load energized disenergized Capacity-controlled energized energized disenergized disenergized Upon request of full load start-up, the capacity-controlled solenoid valve energizes; after 2 seconds the compressor relay will be actuated.
  • Page 19 r7: Water temperature @ evaporator output circuit no. 2, B4 It displays the temperature at evaporator outlet in circuit no. 2 (B4). r8: Temperature/pressure defrosting 1, B3 It displays temperature or pressure of the condenser of circuit no. 1 (B3). r9: Temperature/pressure defrosting 2, B5 It displays temperature or pressure of the condenser of circuit no.
  • Page 20 c4: Time-delay between the ON routines of the compressors/time-delay of the capacity-controlled routine It allows to set the minimum time-interval between the ON routines of the two compressors so as to reduce inrush consumption. In a capacity-controlled compressor, this parameter indicates the time-delay before the actuation of the capacity-controlled routine.
  • Page 21 c8: Delay in switching OFF compressor after Switching OFF the pump. Both in the Cooling and Heating operating mode, with the pump (or inlet fan) actuated upon request of the controller (parameter H5=2), if the compressors deactivation is required, the controller will first deactivate the compressors and then the pump (inlet fan in air-air units).
  • Page 22 Example of F2=2 Cooling mode T/P condensation F5 Temp. Min F6 Temp. Max “Summer” “Summer” Speed Speed Example of F2=2 Heating mode T/P condensation F5 Temp. Max F6 Temp. Min “Winter” Speed “Winter” Speed Example of F2=3 Cooling mode Max speed Min speed Cutoff temperature Summer T/P max “Summer”...
  • Page 23 correspond to the real tension applied, but to an internal variable within the µchiller. See page 60 to find the value of F4. If either the ON/OFF converter (code CONV0NOFF0) or the PWM/0÷10V converter (code CONV0/10A0) are used we recommend to set this parameter to its maximum value (166 in case of mains frequency of 50 Hz, 138 if it is equal to 60Hz) and close the jumpers P1 and P6 located in the single compressor board and in the expansion for control of the second compressor.
  • Page 24 d4: End-defrosting temperature/pressure It indicates the temperature or pressure threshold which makes the defrosting cycle end. d5: Minimum time-interval before starting a defrosting cycle It indicates the time-interval necessary to carry out the d3 condition, before a defrosting cycle is started (the compressor must be ON).
  • Page 25 dc: Delay before defrosting When the defrosting condition has been detected, but before the real activation of the cycle, the unit stops the compressor for a time-interval dc (selectable from 0 to 3 minutes). After the compressor stops, the 4-way valves will rotate after a time-lapse of dc/2;...
  • Page 26 A5: Antifreeze It indicates the differential controlling the ON/OFF status of the antifreeze heaters. Carel NTC Probes Antifreeze alarm differerntial Antifreeze heaters Heaters Antifreeze Antifreeze alarm set point Antifreeze heaters A6: Support heater probe It indicates the probe to be used (B1 or B2) for the control of support heaters. The Value Selection meaning of the parameter is as follows:...
  • Page 27 If P6=1 the operating logic of the cooling/heater selection is reversed (both by keypad, infrared remote controller and digital input). Symbol P6=0 P6=1 Cooling (chiller) Heating (heat pump) Heating (heat pump) Cooling (chiller) P7: Low pressure alarm with pressure probe If P7=1 with the heat pump selection lower than 1bar (obviously the presence of the condenser-pressure probes must be enabled, parameter /3) and the low pressure alarm is activated (by maintaining in any case the possible delay P3).
  • Page 28 H5: Operating logic of the Pump It sets the operating logic of the water circulation pump . The pump can be disabled, always ON or ON upon a call from the regulator (in this case the pump will be the first device to start, followed by the compressors). With disabled pump the flow switch alarm will not be present although the Pump Relay will be normally activated.

  • Page 29: Alarms And Messages

    5 Alarms and messages Any time an alarm condition is detected, the controller will prompt the following actions: • the buzzer sounds (if previously enabled - see P4 parameter and dip-switch no.3 on the terminal - and if the machine is not in stand-by) •...

  • Page 30: Other Alarms

    Compressor overload The alarm condition is detected independently of the status of the pump and of the compressors. The compressors are forced into the OFF mode (previously set protection time-intervals are ignored) and at the same time the buzzer, the alarm relay and the lighting of the display are activated.

  • Page 31: Unit Indication Sequences

    The alarms E2 and E4 (E3 and E5 with unit model no.5) in water chillers activate the corresponding antifreeze heater. Faulty EEprom alarm Type Input Alarm Delay Reset Error Faulty EEprom automatic It indicates a problem in the storing of data in the non-volatile memory of the unit (EEprom); the regulation process continues on the basis of the data stored in the RAM.

  • Page 32: Infrared Remote Control Unit

    Yellow LED located on singol N° Error mess. Display Buzzer Alarm Relay compressor board blinks faster (1) blinks at normal frequency ON (2) Energized blinks faster (1) Flashes blinks at normal frequency Disenergized blinks faster (1) ON (2) Energized blinks at normal frequency Disenergized cn flashing blinks faster (1)

  • Page 33: Wiring Connection

    7 Wiring connection The drawings below show the wiring connection of the unit and of the remote terminal. RG66000889-REV.00...

  • Page 34: Optional Boards

    If 2 terminals (local or remote) are connected to the same single compressor board, they need to be addressed; therefore, set the two deep-switches called "address" placed on the terminals to 01 (the dip-switch which is placed in the more external side of the electronic component must be set in ON position; this procedure must be effected only in one of the 2 terminals).
  • Page 35 RS485 serial board technical characteristics Power supply voltage: 5Vdc ±10% from the µchiller through plug-in connector Absorbed current: 70 mA Storage conditions: -10T70 (-10÷70°C), rH <90% not condensing Operating conditions: T65 (0÷65°C), rH <90% not condensing Card dimensions: 50x50 mm Protection index: IP00 Environmental pollution:...

  • Page 36: Technical Specifications

    9 Technical specifications Single compressor board Power source: 24Vac +10% -15% at 50/60Hz, protected with a fuse located on the board (250Vac, 2A delayed). Number of cards Min. power supply required 1 compressor 17VA 1+2 compr.s 25VA 1 compr. + terminal 19VA 1+2 compr.s + terminal 27VA...
  • Page 37 Terminal for wall mounting Technical specifications Power supply: from the single compressor. main board Connections: via 8-way telephone cable Max distance: 3m from the single compressor main board Working temperature: 0÷50°C Storage temperature: -10÷70°C Working humidity: 90%rH (not condensing) Storage humidity: like operating humidity Limits of surface temp.: like operating temperature...
  • Page 38 RG66000889-REV.OO...
  • Page 39 RG66000889-REV.00...
  • Page 40 40010 Bentivoglio (BO) Via Romagnoli, 12/a Tel. 051/8908111 Fax 051/8908122 www.galletti.it...

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