Thermocold MEX VS 15 RH Manual
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Thermocold MEX VS 15 RH Manual

For chillers and inverter air/water heat pumps with axial fans
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CONTROLLER MANUAL
MEX VS 15 RH / MEX VS 16 RH
MEX VS 18 RH / MEX VS 19 RH
MEX VS 112 RH /MEX VS 112T RH
MEX VS 115 RH / MEX VS 115T RH
Cod. MCO14124H7820-04
This manual has been created for informative purpose. The company declines any responsibility for the results of any projecting or any installation based on the explanations and/or on
the technical specifications provided in this manual. It is besides forbidden the reproduction under any form of the texts and of the figures contained in this manual.
"This manual is a translation from the official italian language version. For reasons of environmental respect the Company will not provide the hard copy in the original language which
could be directly requested or downloaded from the Company website at any time. In case of any dispute, the original language manual will be the trusted one".
CONTROLLER MANUAL FOR CHILLERS
AND INVERTER AIR/WATER HEAT
PUMPS WITH AXIAL FANS

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Summary of Contents for Thermocold MEX VS 15 RH

  • Page 1 AND INVERTER AIR/WATER HEAT PUMPS WITH AXIAL FANS CONTROLLER MANUAL MEX VS 15 RH / MEX VS 16 RH MEX VS 18 RH / MEX VS 19 RH MEX VS 112 RH /MEX VS 112T RH MEX VS 115 RH / MEX VS 115T RH Cod.

  • Page 2: Table Of Contents

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans INDEX GRAPHIC SYMBOLS ................................3 PERMITTED USES ..................................3 GENERAL SAFETY RULES ..............................3 PERSONAL SAFETY EQUIPMENT............................ 3 WORKERS’ HEALTH AND SAFETY ..........................3 PURPOSES AND CONTENTS OF THE MANUAL ........................ 5 USER –...
  • Page 3 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans 10.10.3 In joint operation (Area II) ............................20 10.10.4 In substitution operation ............................20 10.11 OPERATION AREA - ACTIVATION OF THE AUXILIARY ELECTRIC HEATER AND BOILER (P LANT CIRCUIT )..........................

  • Page 4: Graphic Symbols

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans CONSERVATION OF THE MANUAL The manual has to be always kept for future reference. It has to be stored in a safe place, away from dusts and moisture. It has to be also available and accessible to all users who shall consult it any time they are in doubt on how to operate the equipment.
  • Page 5 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans It’s forbidden:  To remove and/or tamper with any safety device.  The access to the electrical board by unauthorized persons.  To carry out any work on the equipment under voltage. ...

  • Page 6: Purposes And Contents Of The Manual

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans Requirements before performing electrical work on the control panel:  Turn off the unit from the control panel ("OFF" displayed).  Put the switch “QF” general differential on OFF position. ...

  • Page 7: Menu's Contents

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans Level 0 (U) = always visible Level 1 (M) =it’s visible if you enter the maintainer (H80) or manufacturer password. Level 2 (C) = it’s visible if you enter the constructor password. Level 3 (A) = it’s visible only via Modbus.

  • Page 8: Alarms' Menu

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans Water inlet temperature (°C) Water outlet temperature (°C) Compressor intake temperature (°C) Compressor discharge temperature (°C) Outdoor air temperature (°C) Low pressure (bar) High pressure (bar) *t15 Desuperheater gas temperature sensor (if present)

  • Page 9: User Adjustable Set Point

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans 4. Turn ON the unit by placing the main switch in ON position; 5. Open the page of the parameters PRGPSSPRG(introduce the maintainer password)PRGUSBUPdFPRG. The automatic firmware updating process starts with the selection of this option, the display shows the transferred data in Kilobytes.

  • Page 10: Dynamic Set-Point Adjustment

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans Programmable analog input with NTC sensor 19.1 / 19.2 Not set 10kΏ at 25°C β 3435. 22.1 (gnd) ST11 Not set Under voltage input 0-10Vdc 22.2 (under voltage input) Remote summer/winter Voltage free contact digital input...

  • Page 11: Set-Point Adjustment From 0-10V Input

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans Heating 7 SET-POINT ADJUSTMENT FROM 0-10V INPUT Another type of setting that allows to change the set-point by adding (or subtracting) a value in function of the 0-10V analogue input (if enabled).

  • Page 12: Operation By Mean Of Thermoregulator (Default)

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans The circulator is always running if the antifreeze heaters are activated. The circulator can be configured with the parameter P03 in order to operate independently than the compressor or under a thermoregulatory call.

  • Page 13: Operation With Active Electric Heater

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans The periodic function is also interrupted in the case of the intervention of the antifreeze thermo-regulator constraining the operation of the pump. OPERATION WITH ACTIVE ELECTRIC HEATER See paragraph 10.8.

  • Page 14: Fan Speed Control In Heating Mode

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans Pre-ventilation period in chiller mode: before the compressor startup, the fan starts operation for 5 seconds; the fan speed is proportional to the condensation temperature, however, if the controller requires the cut-off during this period, the fan motor will run at preset minimum fan speed.

  • Page 15: Antifreeze Protection Electric Heaters (When The Integrated Defrosting Kit Accessory Is Present)

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans 10.1 ANTIFREEZE PROTECTION ELECTRIC HEATERS (WHEN THE INTEGRATED DEFROSTING KIT ACCESSORY IS PRESENT) The electric heaters of water antifreeze, installed on the outer surfaces of the evaporator plates, activates even when the unit is switched off (but energized) if the outlet water temperature goes below r02 °C (default is 4°C) in heating mode or below r03 °C (default is 4°C) in cooling mode and in shut off condition.

  • Page 16: Sensor Memorization In Heating Mode

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans I/O Ports - Parameter Value Function 0 (default) Inactive function Function is active in heating and cooling mode. H10=1 The remote on-off function doesn’t disenable the DHW production. Function is active in heating and cooling mode.

  • Page 17: Heating Mode On Sanitary Accumulation

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans i-HWAK 4 i-HWAK 4 i-HWAK 4 i-HWAK 4 10.3 HEATING MODE ON SANITARY ACCUMULATION If H130=1, the appliance exploits the accumulation tank for sanitary hot water also for heating the plant side. In these conditions, the command relay of the sanitary valve will be also energized during heating operation and not only in sanitary mode.

  • Page 18: Summer/Winter Mode Commutation

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans If the sanitary mode is active and the H10 parameter is set as: H10 = 1, the remote on-off function has no effect on the production of domestic hot water, it turns off only the heating/cooling operation of the heat pump on plant side (in such case the on-board unit control display shows the voice "SAN").

  • Page 19: Plant Circuit Electric Heater

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans DHW sides. To define the mode of using of the auxiliary electric heaters for plant system and DHW side, you must set the parameter “r24” as below.

  • Page 20: Management Of The Circulator With Active Electric Heater

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans plant side is accomplished); r20=1, the priority is for the sanitary (the electric heater of the plant system side will operate only if the thermoregulation of the sanitary heater is accomplished). 10.8 Management of the circulator with active electric heater It is possible to activate the circulator of the heat pump when the plant system and/or the DHW auxiliary electric heaters are active in the absence of compressors operations (for substitution, for alarm or for integration in band II or III).

  • Page 21: Operation In Heat Pump Mode

    Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans When changing the values of the parameters r22, r28, r08, you have to respect the following condition: r22 ≥ r28 ≥ r08. You can remove the zone corresponding to the “in joint operation I” just by putting r22=r28; you can also remove the zone corresponding to the “in joint operation II”...
  • Page 22 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans TABLE 1. NORMAL OPERATION IN HEAT PUMP MODE ORDER OF INTERVENTION OF HEATING ELEMENTS (when the N° MODE OPERATION set-point is not achieved and the unit is in alarm condition) HEAT / 1) Auxiliary electric heater of plant...
  • Page 23 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans 1) Heat pump 2) After r15 minutes, boiler Set up of HEAT+SAN SANITARY 3) After r15 minutes later, auxiliary minutes electric heater of sanitary 1) Heat pump HEAT / HEAT OR IN Set up of...
  • Page 24 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans TABLE 4. SUBSTITUTION OPERATION ORDER INTERVENTION N° HEATING SYSTEMS (when the set- MODE OPERATION point is not achieved) 1) Boiler HEAT / Set up of 2) After r12 minutes, auxiliary HEAT 0/1/2...
  • Page 25 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans The below Table (6) shows the behavior of the auxiliary electric heaters of both sanitary and plant in all cases where the unit is operating. TABLE 6.
  • Page 26 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans I/O port- Parameter Value Function active by default H85=24 Alarm signalization 10.12.3 Heat pump lockout It is possible to configure a voltage output to signalize the presence of heat pump lockout alarm. In order to enable this function, you should enter into parameters PRGPSS(insert the maintainer password) ...
  • Page 27 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans “DO7” digital output activable via H85 H85=25 3-way valve for radiant panels 11 AVAILABLE FUNCTIONS WITH TOUCH SCREEN REMOTE CONTROL PANEL ACCESSORY The “TOUCH SCREEN REMOTE CONTROL PANEL ” device is a touch screen remote control panel for centralized management of chiller/heat pump units;...
  • Page 28 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans When the heat pump is in Off mode, the relaunching circulator will not operate independently than the thermostat calling. 12.3 MIXING VALVE MANAGEMENT The PID control of the mixing valve helps to keep the outlet temperature of the radiant panel at the setpoint value. In order to enable this, you should enter into the parameters as follow: press PRGPSSPRG ...
  • Page 29 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans  S05 = time period when the solar circulator is ON (default 15 seconds);  S06 = time period when the solar circulator is OFF (default 15 seconds). The parameter S08 (default 2°C) is used as hysteresis to exit from the protection condition.
  • Page 30 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans Notes: (*) Configurable setpoint if the DHW function is activated. (**) Configurable setpoint if the optional module KIE is present. (***) Don’t change if “Antifreeze Kit” kit is installed.
  • Page 31 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans Allowed configuration Note Parameter Description Unit Default Range Visibility Value Description First setpoint in cooling mode °C H03÷Co2 First setpoint in heating mode °C 45.0 He2÷H01 *San Domestic water temperature Setpoint...
  • Page 32 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans “DO7” H85=29 Activation of the boiler H85=24 Alarm signalization H85=31 Signalization of Summer/Winter mode operation H85=21 Defrosting signalization H85=47 Machine lock-out notification Configuration of the under-voltage output H86=0 Inactive output 0÷47...
  • Page 33 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans Set of the pressure at the minimum fan Depending -50.0÷80.0 speed in cooling mode on the model Proportional band for fan motor Depending 0.0÷25.5 modulation in cooling mode on the model Depending Fan cut-off delta...
  • Page 34 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans Time delay of activation of the auxiliary 0÷255 electric heater of sanitary circuit/heat pump Activation period of drain pan heaters from 0÷255 r19 = 0 Activation of the electric heater independently than the defrosting operation last defrost operation r20 = 0 Priority for plant side Priority for utilizing the electric heaters...
  • Page 35 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans 15 GLYCOL-WATER SOLUTIONS In the models where glycol-water solution is used, it’s necessary to contact our Technical Office for the adjusting the settings of the parameters. 16 ALARMS 16.1 WATER FLOW SWITCH ALARM [E006] The water side flow switch is already installed inside the unit and DOES NOT HAVE to be tampered with or by-passed in any way.
  • Page 36 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans The alarm is not active for a bypass time of approximately 180 seconds from the compressor startup.  In heating or DHW mode, the alarm is active when the bypass time has expired with water supply temperature less than the heat pump water return temperature.
  • Page 37 Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans Error code Error description Lockout E971 EEPROM not initialize Compressor...
  • Page 38 Technical data shown in this booklet are not binding. Thermocold shall have the right to introduce at any time whatever modifications deemed necessary to the improvement of the product. 70026 Modugno – Bari Via dei Ciclamini, 25 – Z.I. Tel. 080/5312623 Internet: http://www.thermocold.it...

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