MPCA7200 INSTALLATION,

Transcription

1 motivair 25 John Glenn Drive, #104, Amherst, NY Phone: (716) , FAX: (716) motivair AIR COOLED CHILLERS Model: MPCA0005 MPCA7200 INSTALLATION, OPERATION, & MAINTENANCE INSTRUCTIONS Specializing Water Cooling Systems Visit our website:

2 MANUAL for MPC-A CHILLERS LEGAL PROVISIONS, SAFETY INSTRUCTIONS Operator's Responsibility This equipment MUST be installed, maintained & operated by a person or persons qualified for this equipment. This chiller contains refrigeration, water circulation, and electrical components. The person most suited for this equipment is a qualified refrigeration technician with a valid refrigeration licence. Intervention by unauthorized or unqualified parties may invalidate the warranty. WARNING Operation of this system involves potentially Iethal dangers (high voltage and high pressures). Therefore, all safety precautions and warnings described in this manual must be precisely observed. Otherwise, severe or fatal injury may be caused. SAFETY INSTRUCTIONS The installation, start-up and maintenance of these devices is dangerous, because: high pressures are generated in the equipment electrical parts are energized the equipment contains hot pipes rotating parts (fans) can cause injury. The devices themselves may be installed in a dangerous position (e.g. roof, etc.) Fans can start without warning. For these reasons, the equipment must be installed and connected to the electricity/water installations by qualified companies only. Start-up and maintenance must be conducted by a qualified refrigeration company only. Simple maintenance operations on the devices - without opening them - may be performed by the operator. All other work must be performed by specially qualified personnel.

3 MANUAL for MPC-A CHILLERS FONDATIONS, INSTALLATION Foundation Installation site All chillers must be mounted on a solid, horizontal surface, suitable for the weight of the chiller. Note the chiller weight is increased by filling with water. Observe all local regulations. Must be dry and protected against freezing. The room temperature must not be colder than 41 F. The system must be installed horizontally. The components are not suitable for exterior installation, without factory modification and approval. Consult Motivair if chiller will be installed outdoors. Installation Compliance with the following basic rules for the installation of chillers with axial fans wiil ensure problem-free operation and the rated refrigeration capacity. Basic rules: 1. The condenser air is blown out vertically or horizontally. 2. Do not install the chiller close to heat sources. Heated air intake must be avoided. 3. The condenser fans are rated for ZERO external static pressure. They do not have the capacity to push air through ducting, which means that NO DUCTS OR MUFFLERS may be used on the inlet or outlet of the chillers. 4. No air short-circuit is permitted, i.e. the heated discharge air from the condenser fans must never be drawn back into the condenser inlet. This will occur if the chiller is too close to a wall, or a low ceiling, or other obstructions. Structure-transmitted noise Vibration Clearances It is possible that noise or vibration may be transmitted through the ground, or building structure. If this occurs, it may be necessary to install a vibration elimination device. The construction specifications of the customer/engineering contractor regarding structure transmitted noise or vibration must be observed. May be transmitted through the chilled water piping. This can be avoided by the use of flexible piping connections. Must be maintained for servicing and ventilation purposes. All removable side panels must be available for service. A minimum of 3 feet on all sides is required. Consult Motivair for irregular space requirements.

4 MANUAL for MPC-A CHILLERS SITE HANDLING LIFTING - UNLOADING POSITIONING Notices (symbols) on device packing must be observed Check the center of gravity of the chiller Use appropriate unloading equipment. Remove protective film from metal panels before use. MANUFACTURER'S NOTE The chiller may be damaged by: Dropping or tipping it on the ground. Pulling the chiller by cords, straps, etc. Lifting the chiller by its piping system. Excessive shaking by cranes Damage of this type is not covered by warranty. MAX 45

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6 MANUAL for MPC-A ELECTRICAL MAIN ELECTRICAL POWER CONNECTION The connection of the chiller to the main electrical power supply must be carried out by a licensed electrician, and in strict accordance with Local Safety Standards and electrical codes. The manufacturer of the chiller accepts NO LIABILITY for the installation, or work performed by the customer or the installing contractor. ELECTRICAL COMPONENTS Factory-wired electrical panel The control panel mounted in the chiller contains all necessary controls for the chiller. Additional wiring in the panel Additional wiring is permitted but must not modify the original condition of the factory-installed wiring. All changes must be recorded in the original wiring diagram and must be available to the manufacturer. MPC-A MPC-A MAIN VOLTAGE SUPPLY 230V/1/60 (3 wire) 460V/3/60 (4 wire) The permissible voltage tolerance is ±5%. These values are BINDING and COMPULSORY. INFORMATION ON EXTERNAL WIRING Main power feed If for local code or other reasons the cable size of the power supply is larger than the terminal size on the main disconnect switch or power block: 1. A junction box must be fitted to the chiller in compliance with local codes in order to reduce the cable cross-section, or 2. The main disconnect switch or power block of the chiller must be replaced (prior approval of the manufacturer is required). WIRING DIAGRAM INSPECTION Check that the wiring diagram supplied with the chiller is correct and complete: 1. System designation 2. Order number (see nameplate) 3. Electrical data on wiring diagram - cover sheet MAX.RUNNING CURRENT FLA MPCA V/60Hz/1~/PE 9 Amp MPCA V/60Hz/1~/PE 11A MPCA V/60Hz/3~/PE 9A MPCA V/60Hz/3~/PE 11A MPCA V/60Hz/3~/PE 15A MPCA V/60Hz/3~/PE 19A MPCA V/60Hz/3~/PE 28A MPCA V/60Hz/3~/PE 33A MPCA V/60Hz/3~/PE 40A MPCA V/60Hz/3~/PE 64A MPCA V/60Hz/3~/PE 76A MPCA V/60Hz/3 /PE 92A MPCA V/60Hz/3~/PE 108A MPCA V/60Hz/3~/PE 126A MPCA V/60Hz/3~/PE 148A MPCA V/60Hz/3~/PE 150A CAUTION MANUFACTURER S NOTICE The main disconnect switch in the control panel must be switched OFF before any site wiring work, Do not switch on the control microprocessor until commissioning/start up has been successfully completed, or this may invalidate the manufacturer s warranty. Model Information: REFER TO DATA ON PLAQUE FOR EACH MODEL

7 CHILLED WATER/GLYCOL MANUFACTURER'S SPECIFICATIONS The chiller circuit must be 100% filled with water for opperation. If the cooling process causes a loss a water in the circuit, an automatic water make-up valve must be installed. lnsufficient water content of the system wiil lead to 1. Safety devices 2. Controls, due to compressor fluctuations/ hunting (frequent switching) 3. Cooling capacity. If the water content of the complete system is too low, an additional reservoir may be installed on the chilled water inlet side of the chiller. OnIy operate the chiller with the flow switch (supplied), that switches off the chiller in the event of insufficient water or a faulty pump. If this condition is not satisfied: ALL WARRANTY CLAIMS SHALL BE INVALID. A flow meter and an automatic water make-up system can be purchased from the factory. COLD WATER PIPING Water piping and connection to the chiller must conform with all generally accepted piping practices and local codes. All piping should be performed by a qualified person or company. The following specifications are intended to prevent damage to the chiller. 1. Avoid unnecessary pressure drop by ensuring correct pipe sizes and routing. 2. Connect the chiller with vibration eliminators to avoid transmission of noise or vibration MANUAL for MPC-A WATER CIRCUIT 6. Ensure that the water circuit is maintained at the correct pressure by installing an appropriately sized diaphragm expansion tank close to the inlet of the chiller. The return side of the chiller must be 5-10 psig when the pump is running. 7. Install temperature and pressure gauges at the inlet and outlet of the chiller and the heat load to insure easy inspection and maintenance 8. All chilled water lines should be insulated. Only insulate pipes AFTER testing the circuit for leaks. NOTE: See Water Circuit Appendix A (pages 28-31) for additional information on how to install & vent a chilled water piping system. GLYCOL G IN CIRCUIT Glycol mixture The following basic rules must be observed: 1. The freezing point of the mixture must be lower than the minimum evaporation temperature, or the lowest outside piping temperature, whichever is the lower. 2. See correction factors for glycol concentration on back page of chiller brochure. 3. Use only an industrial-grade inhibited ethylene glycol or food-grade propylene glycol solution. DO NOT use auto antifreeze. 4. Check the ph-value of the solution. lt should be about 9 and must never be less than Check the ph-value regularly (maintenance). 6. DO NOT use galvanized piping or fittings 3. Fit shut-off valves on both sides of the chiller so that maintenance and repair work can be performed without draining the piping system. 4. Fit a filter or Y-strainer (40 mesh) to the chiller inlet to protect the evaporator and pump from foreign particles. 5. IMPORTANT: Filter/strainer must be installed, or blockage of the evaporator may occur 6. Fit automatic vents at all local high points of the piping system to eliminate air locks. See chilled water system diagram for location. IMPORTANT: NEVER change the antifreeze alarm on chiller without written authorization from factory. WARRANTY WILL BE VOID WARNING! The glycol/water mixture must not be discharged into the normal water drainage system. lt must be collected in suitable containers and disposed of in accordance with legal regulations.

8 MANUAL for MPC-A FRONT PANEL 1. MAIN SWITCH Function Activation O I Disconnects the power supply of device starts and stops the chiller power supply is OFF power supply is ON 6. ELECTRONIC THERMOSTAT This system is controlled by an electronic thermostat. The essential operating data and information are shown by the display. DISPLAY Normal Mode: XX.X actual temperature of the chilled water in the chiller tank. DISPLAY ON CHILLER IS OPERATING, SEE DIXEL CONTROL DESCRIPTION (included). WARNING High voltage Danger of fatal injury Do not open the control panel before isolating the incoming power supply; the power supply of input terminal remains ON. KEYS: SET (UP) (DOWN) pressed for more 5 sec. To view the factory SET POINT increases the displayed value decreases the displayed value INDICATORS FUNCTION ON 3. PUMP Pump is on 4. COMPRESSOR Compressor is on Comp (*) indicates compressor ON 7. PUMP GAUGE Indicates the external pressure of the water pump N.B. MPCA0005 has only main switch (1) and mechanical thermostat (6) for regulation. CAUTION PUMP PRESSURE PSIG

9 MANUAL for MPC-A FRONT PANEL 1. MAIN SWITCH Function Disconnects the power supply of chiller 2, WORKING SWITCH Activation O I OnIy for starting and stoping the chiller circulation pump. Switch must be on to start chiller opperaion. power supply is OFF power supply is ON 6. ELECTRONIC THERMOSTAT This system is controlled by an electronic thermostat. The essential operating data and information are displayed by the display. DISPLAY Normal Mode: XX.X actual temperature of the chilled water inside the storage tank. DISPLAY ON CHILLER IS WORKING, SEE DIXEL DESCRIPTION (included). KEYS: WARNING High voltage Danger of fatal injury Do not open the control panel before isolating the incoming power supply; the power supply of input terminal remains ON. SET (UP) (DOWN) pressed for more 5 sec. To view the factory SET POINT pressed increases the displayed value pressed decreases the displayed value INDICATORS FUNCTION (ON) 3. LINE electric circuit is on 4. COMPRESSOR Compressor is working 5. ALARM Intervention of protection device Comp ( ) indicates compressor ON 7. PUMP PRESSURE GAUGE Indicates the pressure of the water pump CAUTION PUMP PRESSURE PSIG

10 MANUAL for MPC-A DIXEL CONROLS Single Stage Thermostat XR10C Contents 1. GENERAL WARNING 2. GENERAL DESCRIPTION 3. CONTROLLING LOADS 4. FRONT PANEL COMMANDS 5. LIST OF PARAMETERS 6. INSTALLATION AND MOUNTING 7. ELECTRICAL CONNECTIONS 8. ALARM SIGNALS 9. TECHNICAL DATA 10. CONNECTIONS 11. DEFAULT SETTING VALUES GENERAL G WARNING Please read before using this manual This manual is part of the product and should be kept near the instrument for easy and quick reference. The instrument shall not be used for purposes different from those described hereunder. It cannot be used as a safety device. Safety Precautions Check the supply voltage is correct before connecting the instrument. Do not expose to water or moisture: use the controller only within the operating limits avoiding sudden temperature changes with high atmospheric humidity to prevent formation of condensation Warning: disconnect all electrical connections before any kind of maintenance. The instrument must not be opened. Fit the probe where it is not accessible by the end user. In case of failure or faulty operation send the instrument back to the distributor or to Dixell s.r.l. (see address) with a detailed description of the fault. Consider the maximum current which can be applied to each relay (see Technical Data). Ensure that the wires for probes, loads and the power supply are separated and far enough from each other, without crossing or intertwining. In case of applications in industrial environments, the use of mains filters (our mod. FT1) in parallel with inductive loads could be useful. General G description Model XR10C, 32 x 74 mm format, is a single stage temperature controller suitable for applications in the field of refrigeration or heating. Controlling loads The regulation output The regulation is performed according to the temperature measured by the probe. The instruments are provided with the CH programmable parameter which enables the user to set the regulation both for heating or cooling applications: CH = CL: cooling applications CH = Ht: heating applications CH = CL: cooling applications. The Hy value is automatically set above the Set Point. If the temperature increases and reaches set point plus differential the compressor is started and then turned off when the temperature reaches the set point value again. CH = ht: heating application. The Hy value is automatically set under the Set Point. If the temperature decreases and reaches set point minus differential the regulation output is activated and then turned off when the temperature reaches the set point value again. Front F panel commands SET: To display target set point, In programming mode it selects a parameter or confirm an operation. è (UP): To see the max stored temperature; in programming mode it browses the parameter codes or increases the displayed value. à (DOWN) To see the min stored temperature; in programming mode it browses the parameter codes or increases the displayed value. KEY COMBINATIONS: è + à To lock & unlock the keyboard. SET + à To enter in programming mode. SET + è To return to the room temperature display. MEANING of LEDS Each LED function is described in the following table. LED MODE FUNCTION ON Output enabled Flashin g LED1 Flashin g -Programming Phase (flashing with LED1) - Anti-short cycle delay enabled Programming Phase (flashing with ) HOW TO SEE THE MIN TEMPERATURE 1. Press and release the à key. 2. The Lo message will be displayed followed by the minimum temperature recorded. 3. By pressing the à key again or by waiting 5s the normal display will be restored. HOW TO SEE THE MAX TEMPERATURE 1. Press and release the è key. 2. The Hi message will be displayed followed by the maximum

11 MANUAL for MPC-A DIXEL CONTROLS temperature recorded. 3. By pressing the è key again or by waiting 5s the normal display will be restored. HOW TO RESET THE max OR min TEMPERATURE RECORDED 1. Hold press the SET key for more than 3s, while the max. or min temperature is displayed. (rst message will be displayed) 2. To confirm the operation the rst message starts blinking and the normal temperature will be displayed. HOW TO SEE THE SETPOINT To exit: Press SET + è or wait 15s without pressing a key. NOTE: the set value is stored even when the procedure is exited by waiting the timeout to expire. HOW TO MOVE A PARAMETER FROM THE HIDDEN MENU TO THE FIRST LEVEL AND VICEVERSA. Each parameter present in the HIDDEN MENU can be removed or put into THE FIRST LEVEL (user level) by pressing SET + à. In HIDDEN MENU when a parameter is present in Fisrt Level the decimal point is on. HOW TO LOCK THE KEYBOARD 1) Push and immediately release the SET key: the display will show the Set point value; 2) Push and immediately release the SET key or wait for 5 seconds to display the probe value again. HOW TO CHANGE THE SETPOINT 1) Push the SET key for more than 2 seconds to change the Set point value; 2) The value of the set point will be displayed and the LED starts blinking; 3) To change the Set value use the è or à arrows within 10s. 4) To memorise the new set point value push the SET key again or wait 10s. Changing a parameter s value To change the parameter s value operate as follows: 1. Enter the Programming mode by pressing the Set and DOWN key for 3s (LED 1 and start blinking). 2. Select the required parameter. 3. Press the SET key to display its value (Now only the LED is blinking). 4. Use è or à to change its value. 5.Press SET to store the new value and move to the following parameter. To exit: Press SET + è or wait 15s without pressing a key. NOTE: the set value is stored even when the procedure is exited by waiting the time-out to expire. THE HIDDEN MENU The hidden menu Includes all the parameters of the instrument. HOW TO ENTER THE HIDDEN MENU 1. Keep pressed for more than 3 s the è and à keys. 2. The POF message will be displayed and the keyboard will be locked. At this point it will be possible only to see the set point or the MAX o Min temperature stored 3. If a key is pressed more than 3s the POF message will be displayed. TO UNLOCK THE KEYBOARD Keep pressed together for more than 3s the UP and DOWN keys. List of Parameters NOTE: the parameters preceded by dots are only in the Hidden Menu. REGULATION Hy Differential: (0,1 25,5 C / F) Intervention differential for set point. Cooling: Compressor Cut IN is Set Point Plus Differential (Hy). Compressor Cut OUT is when the temperature reaches the set point. Heating: Compressor Cut IN is Set Point minus Differential (Hy). Compressor Cut OUT is when the temperature reaches the set point. LS Minimum set point: (- 50 C SET / -58 F SET): Sets the minimum acceptable value for the set point. US Maximum set point: (SET 150 C / SET 302 F). Set the maximum acceptable value for set point. Ot Thermostat probe calibration: ( C; F) allows to adjust possible offset of the thermostat probe. OdS Outputs activation delay at start up: (0 255min) This function is enabled at the initial start up of the instrument and inhibits any output activation for the period of time set in the parameter. AC Anti-short cycle delay: (0 50 min) minimum interval between the compressor stop and the following restart. COn Compressor ON time with faulty probe: (0 255 min) time during which the compressor is active in case of faulty thermostat probe. With COn=0 compressor is always OFF. COF Compressor OFF time with faulty probe: (0 255 min) time during which the compressor is OFF in case of faulty thermostat probe. With COF=0 compressor is always active. CH Type of action: CL = cooling; Ht = heating. DISPLAY CF Temperature measurement unit: C = Celsius; F= Fahrenheit. WARNING: When the measurement unit is changed the SET point and the values of the parameters Hy, LS, US, Ot, ALU and ALL have to be checked and modified) res Resolution (for C): (in = 1 C; de = 0.1 C) allows decimal point display. ALARMS ALC Temperature alarms configuration: (Ab; re) (Ab= absolute temperature: alarm temperature is given by the ALL or ALU values. re = temperature alarms are referred to the set point. Temperature alarm is enabled when the temperature exceeds the SET+ALU or SET-ALL values. ALU MAXIMUM temperature alarm: (ALL 150 C; ALL 302 F) when this temperature is reached the alarm is enabled, after the Ald delay time. ALL Minimum temperature alarm: (-50.0 C ALU; -58 F ALU) when this temperature is reached the alarm is enabled, after the Ald delay time. 1. Enter the Programming mode by pressing the Set + à key for 3s (LED 1 and start blinking). 2.When a parameter is displayed keep pressed the Set+à for more than 7s. The Pr2 label will be displayed immediately followed from the HY parameter. NOW YOU ARE IN THE HIDDEN MENU. 3. Select the required parameter. 4. Press the SET key to display its value (Now only the LED is blinking). 5.Use è or à to change its value. 6.Press SET to store the new value and move to the following parameter.

12 MANUAL for MPC-A DIXEL CONTROLS ALd Temperature alarm delay: (0 255 min) time interval between the detection of an alarm condition and alarm signalling. dao Exclusion of temperature alarm at startup: (from 0.0 min to 23.5h) time interval between the detection of the temperature alarm condition after instrument power on and alarm signalling. OTHER PbC Probe selection: (Ptc=PTC probe; ntc=ntc probe). It allows to select the kind of probe. Installation and mounting Instrument XR10C shall be mounted on panel, in a 29x71 mm hole, and fixed using the special bracket supplied. The ambient temperature range allowed for correct operation is 0-60 C. Avoid places subject to strong vibrations, corrosive gases, excessive dirt or humidity. The same recommendations apply to probes. Let air circulate by the cooling holes. Electrical connections The instrument are provided with screw terminal block to connect cables with a cross section up to 2,5 mm 2. Before connecting cables make sure the power supply complies with the instrument s requirements. Separate the probe cables from the power supply cables, from the outputs and the power connections. Do not exceed the maximum current allowed on each relay, in case of heavier loads use a suitable external relay. Probe connection The probes shall be mounted with the bulb upwards to prevent damages due to casual liquid infiltration. It is recommended to place probe away from air streams to correctly measure the average room temperature. ALARM SIGNALS Messag Cause Outputs e EE Memory failure P1 Room probe failure Compressor output according to par. Con and COF HA Maximum Outputs unchanged. temperature alarm LA Minimum temperature alarm Outputs unchanged. Alarm EE The instrument is provided with an internal check verifying memory integrity. Alarm EE flashes when a failure in the internal memory is detected. In such case call the service. Alarm recovery Probe alarm P1, starts some seconds after the fault in the probe; it automatically stops some seconds after the probe restarts normal operation. Check connections before replacing the probe. Temperature alarms HA and LA automatically stop as soon as the thermostat temperature returns to normal values. technical data Housing: self extinguishing ABS. Case: frontal 32x74 mm; depth 60mm; Mounting: panel mounting in a 71x29 mm panel cut-out Frontal protection: IP65 Connections: Screw terminal block 2,5 mm 2 wiring. Power supply: 12Vac/dc, ±10% (optional 230, 110, ± 10%, 50/60Hz) Power absorption: 3VA max. Display: 3 digits, red LED, 14,2 mm high. Inputs: 1 PTC probe or NTC probe Relay outputs compressor SPDT relay 8(3) A, 250Vac or SPST relay 20(8)A; 250Vac Data storing: on the non-volatile memory (EEPROM). Operating temperature: 0 60 C. Storage temperature: C. Relative humidity: 20 85% (no condensing) Measuring and regulation range: PTC probe: C ( F) NTC probe: C ( F) Resolution: 0,1 C or 1 C or 1 F (selectable). Accuracy (ambient temp. 25 C): ±0,7 C ±1 digit Connections XR10C: 12Vac/dc; COMPRESS. 8a XR10C: 12Vac/dc; COMPRESS. 20a XR10C: 230Vac; COMPRESS. 8a XR10C: 230Vac; COMPRESS. 20a

13 MANUAL for MPC-A DIXEL CONTROLS default setting values Label Name Range Cooling C/ F Heating C/ F Set Set point LS US 5/41 5/41 Hy Differential 0, C/ F 2/4 2/4 LS Minimum set point -50 C SET/ -58 F SET -50/-58-50/-58 US Maximum set point SET 150 C/ SET 302 F 150/ /302 Ot Thermostat probe calibration C / F 0/0 0/0 OdS Outputs delay at start up min 0 0 AC Anti-short cycle delay 0 50 min 1 0 COn Compressor ON time with faulty probe min 30 0 COF Compressor OFF time with faulty probe min 30 5 CH Type of action (cooling, heating) CL, Ht CL Ht CF Temperature measurement unit C F C/ F C/ F res Resolution in de de/- de/- ALc Temperat. alarms configuration re; Ab Ab Ab ALU MAXIMUM temperature alarm ALL C ALL 302 F 150/ /302 ALL Minimum temperature alarm C ALU/ -58 F ALU -50/-58-50/-58 ALd Temperature alarm delay min 15 5 dao Delay of temperature alarm at start up 0 23h e PbC Probe selection Ptc ntc Ptc/ntc Ptc/ntc Hidden parameters

14 MANUAL for MPC-A FRONT PANEL GENERAL DISPLAY PANEL: Description electric components from model. MPCA0500 to model.mpca MAIN POWER SWITCH - turn on this switch to position I for 24 hours before starting chiller ON/OFF SWITCH - turn this switch to position I (on) after 24 hours to start the chiller. (Not all models) 2 CONTROL PANEL - Alarm codes of microprocessor control printed on fascia panel 3 MICROPROCESSOR - Used to display set points / alarms and to adjust chiller opperating parameters. Contoller has user accesable set points and factory only acccesable set points..

15 1. INTRODUCTION 1.1 General description The µc 2 is a new compact CAREL electronic controller, the same size as a normal thermostat, for the complete management of chillers and heat pumps: it can control air-air, air-water, water-water and condensing units Main functions control of the water inlet and evaporator outlet temperature; defrost management by time and/or by temperature or pressure; fan speed control; complete alarm management; connection to serial line for supervision/telemaintenance; elimination of the expansion vessel. - Driver function Management of electronic expansion valves Controlled devices compressor; condenser fans; reversing valve; water pumps for evaporator and/or condenser, and outlet fan (air-air); antifreeze heater; alarm signal device. ENGLISH Programming CAREL offers the possibility to confi gure all the unit parameters not only from the keypad on the front panel, but also using: a hardware key; a serial line. 1.2 User interface Display The display features 3 digits, with the display of the decimal point between and Outside of this range of measurement, the value is automatically displayed without the decimal (even if internally the unit still operates considering the decimal part). In normal operation, the value displayed corresponds to the temperature read by probe B1, that is, the evaporator water inlet temperature (for water chillers) or the ambient air temperature for direct expansion units. Fig. 1.a show the symbols present on the display and on the keypad and their meanings Symbols on the display Display with 3 green digits (plus sign and decimal point), amber symbols and red alarm symbols. symbol colourmeaningreference refrigerant with LED ON con LED lampeggiante circuit 1; 2 amber compressor 1 and/or 2 ON start up request 1 1; 3 amber compressor 3 and/or 3 ON start up request 2 A amber at least one compressor ON 1/2 B amber pump/air outlet fan ON start up request 1/2 Cambercondenser fan ON 1/2 Damberdefrost activedefrost request 1/2 Eamberheater ON 1/2 F redalarm active 1/2 G amber heat pump mode (P6=0) heat pump mode request 1/2 (P6=0) H amber chiller mode (P6=0) chiller mode request (P6=0) 1/2 Table 1.a H G F E D C B A I L J J K H G F I L E D C B A K Fig. 1.a µc rel

16 ENGLISH Funzioni associate ai tasti tasto stato della macchina modalità pressione I Loading default values press at power ON Go up a sub-group inside the programming area, until exiting (saving changes to EEPROM) press once In the event of alarms, mute the buzzer (if present) and deactivate the alarm relay press once L Access the direct parameters press for 5 s Select item inside the programming area and display value of direct parameters/confi rm the changes to the parameters press once I + L Program parameters afters entering password press for 5 s J Select top item inside the programming area press once or press and hold Increase value press once or press and hold Switch from standby to chiller mode (P6=) and vice versa press for 5 s K Select bottom item inside the programming area press once or press and hold Decrease value press once or press and hold Switch from standby to heat pump mode (P6=0) and vice versa press for 5 s J + K Manual alarm reset press for 5 s Immediately reset the hour counter (inside the programming area) press for 5 s L + J Force manual defrost on both circuits press for 5 s Programming and saving the parameters press and for 5 seconds; the heating and cooling symbol and the fi gure 00 are displayed; use and to set the password (page 28) and confi rm by pressing ; use and to select the parameter menu (S-P) or levels (L-P) and then press ; use and to select the parameter group and then press ; use and to select the parameter and then press ; after making the changes to the parameter, press to confi rm or to cancel the changes; Table 1.b press to return to the previous menu; to save the modifi cations, press repeatedly until reaching the main menu. Note: a. the parameters that have been modifi ed without being confi rmed using the button return to the previous value; b. if no operations are performed on the keypad for 60 seconds, the controller exits the parameter modifi cation menu by timeout and the changes are cancelled Keypad The keypad is used to set the unit operating values (see Parameters/alarms - Keypad combinations) 8 µc rel

17 2. CONNECTIONS 2.1 General diagram Optional board EVD*40*: driver for electronic expansion valve MCH200002*: I/O expansion board for µ 2 SE EVD*40*: driver for electronic expansion valve CONVONOFF*: PWM/digital converter CONV0/10A0*: PWM/analogic converter MCHRTF**A0: fan speed regulator NTC: temperature probes SPKT: trasduttori di pressione V MCH200485*: RS485 serial card MCH2*TSV*: adapter PSOPZKEY*: programming key PW/Modbus RTU CAREL Supervisory MCH2*T*: terminal PW/Modbus RTU CAREL Supervisory ENGLISH Fig. 2.a 2.2 Network layout EV driver Fig. 2.b EV driver DIN EV driver µc rel Fig. 2.c 9

18 4. PARAMETERS 4.1 General parameters The parameters are divided into 4 different types, according to their level of access by the user (password) and their function. For each level, only the access to the parameters of the same or lower level can be set. This means that through factory password, acessing the menù levels (L-P), it is possible to set the desired level for each parameter. Factory parameters: Accessible with the 66 Factory password, allow the confi guration of all the unit parameters. Super User parameters: Accessible with the 11 Super User password, allow the confi guration of the Super User, User and Direct parameters. User parameters: Accessible with password 22, allow the confi guration of the parameters that typically can be set by the user (User parameters) and the Direct parameters, consequently relating to the options. Direct parameters: Accessible without password, this are used to read the probe measurements and any data, by any user, without compromising the operation of the unit. N.B.: The modifi cations to the parameters regarding the confi guration of the unit (type, number of compressors, ) must be performed with the controller in Standby. ENGLISH 4.2 Menu structure main menù For 5 Sa ve in the EEPROM And For 5 setting password parameter values Or Or parameter level parameters /* parameters F-r* probe settings parameters A* software antifreeze parameters r* parameters b* regulation probes parameters P* parameters c* alarm compressor parameters H* parameters D* unit setting parameters F* defrost fan parameter values F1 parameters F1 level value F1 Or parameters Fn µc rel Fig. 4.a 25

19 ENGLISH 4.3 Parameter tables The following tables show of the parameters divided by type/family (e. g. compressor, probes, fans etc.). Key to the parameter tables Level (default) S= super user F= factory D= direct Visibility: The visibility of some groups depends on the type of controller and the value of the parameters. D= defrost (if D01=1) F= fan (if F01=1) N= NTC probe (if /04-/08=2) P= pressure (if /04-/08=3) V= driver (if H08 =1-3) X= expansion (if H08=2-3) - = always present Supervisor variables: R/W = supervisor read/write parameter R= supervisor read-only parameter display parameter and description indicat. /01 Probe type B1 0= not present 1= present /02 Probe type B2 0= not present 1= present /03 Probe type B3 0= not present 1= NTC Cond. Probe 2= NTC Out. Probe /04 Probe type B4 0= not present 1= ON/OFF (D.I) 2= NTC Out. Probe 3= ratiometric cond. Probe, 5 Vdc /05 Probe type B5 0= not present 1= present /06 Probe type B6 0= not present 1= present /07 Probe type B7 0= not present 1= NTC Cond. Probe 2= NTC Out. Probe /08 Probe type B8 0= not present (expansion) 1= ON/OFF 2= NTC Out. Probe 3= ratiometric cond. Probe, 5 Vdc Probe setting parameters: (/*) default min. max. U.O.M. variat. default visibility supervis. Modbus variabile level variable type F 0 1 Flag (R/W) 1 Digital F 0 1 Flag (R/W) 2 Digital F 0 2 fl ag (R/W) 142 Integer F 0 3 fl ag (R/W) 143 Integer F 0 1 Flag 1 0 X 3 (R/W) 3 Digital F 0 1 Flag 1 0 X 4 (R/W) 4 Digital F 0 2 fl ag 1 0 X 16 (R/W) 144 Integer F 0 4 int 1 0 X 17 (R/W) 145 Integer /09 Min. value voltage input F 0 / Vdc 1 50 P 18 (R/W) 146 Integer /10 Max. value voltage input F / Vdc P 19 (R/W) 147 Integer /11 Pressure min. value F 0 /12 bar 1 0 P 1 (R/W) 1 Analog /12 Pressure max. value F / bar P 2 (R/W) 2 Analog /13 Probe B1 calibration F C/ F (R/W) 3 Analog /14 Probe B2 calibration F C/ F (R/W) 4 Analog /15 Probe B3 calibration F C/ F (R/W) 5 Analog /16 Probe B4 calibration F C/bar/ F (R/W) 6 Analog /17 Probe B5 calibration F C/ F X 7 (R/W) 7 Analog /18 Probe B6 calibration F C/ F X 8 (R/W) 8 Analog /19 Probe B7 calibration F C/ F X 9 (R/W) 9 Analog /20 Probe B8 calibration F C/bar/ F X 10 (R/W) 10 Analog /21 Digital fi lter U (R/W) 148 Integer /22Input limitation U (R/W) 149 Integer /23 Unit of measure 0= C 1= F U 0 1 Flag (R/W) 5 Digital Table 4.a 26 µc rel

20 4.3.2 Antifreeze/auxiliary heater setting parameters (A*) display indicat. parameter and description default level min. max. U.O.M. variat. default visibility supervis. variable Modbus variabile type A01 Antifreeze/low ambient temp. (air/air) alarm set point U A07 A04 C/ F (R/W) 11 Analog A02 Differential for antifreeze/low ambient temperature alarm U C F (R/W) 12 Analog A03 Bypass time for antifreeze alarm/low ambient temp. when turning on the unit U S (R/W) 150 Integer in heating mode A04 Set point for the activation of antifreeze heater/auxiliary heater U A01 r16 C/ F (R/W) 13 Analog A05 Diff. for antifreeze heater/auxiliary heater U C/ F (R/W) 14 Analog A06 Auxiliary heater probe F 0 1 Flag (R/W) 6 Digital 0= Control probe see (Table 5.a) 1= Antifreeze probe see (Table 5.a) A07 Antifreeze alarm set point limit F C F (R/W) 15 Analog A08 Auxiliary heater set point in heating mode U A01 r16 C F (R/W) 16 Analog A09 Auxiliary heater differential in heating mode U C/ F (R/W) 17 Analog A10 Antifreeze automatic start up 0= disabled function 1= Heaters and pump on at the same time on A4/A8 2= Heaters and pump on indipendently on A4/A8 3= Heaters ON on A4/A8 U 0 3 Flag (R/W) 151 Integer Table 4.b ENGLISH Probe reading parameters (B*) display parameter and description default min. max. U.O.M. variat. default visibility supervis. Modbus variabile indicat. level variable type b00 Confi g. of probe to be shown on the display U 0 10 Flag (R/W) 152 integer 0= probe B1 1= probe B2 2= probe B3 3= probe B4 4= probe B5 5= probe B6 6= probe B7 7= probe B8 8= set point without compensation 9= dynamic set point with possible compensation 10= remote ON/OFF digital input status b01 Value read by probe B1 D - - C / F (R) 70 Analog b02 Value read by probe B2 D - - C / F (R) 71 Analog b03 Value read by probe B3 D - - C / F (R) 72 Analog b04 Value read by probe B4 D - - C / F/bar (R) 73 Analog b05 Value read by probe B5 D - - C / F - - X 74 (R) 74 Analog b06 Value read by probe B6 D - - C / F - - X 75 (R) 75 Analog b07 Value read by probe B7 D - - C / F - - X 76 (R) 76 Analog b08 Value read by probe B8 D - - C / F bar - - X 77 (R) 77 Analog b09 Driver 1 evaporator temperature D - - C / F - - V 78 (R) 78 Analog b10 Driver 1 evaporator pressure D - - bar - - V 79 (R) 79 Analog b11 Driver 1 superheating D - - C / F - - V 80 (R) 80 Analog b12 Driver 1 saturation temperature D - - C / F - - V 81 (R) 81 Analog b13 Driver 1 valve position D % - - V 82 (R) 82 Analog b14 Driver 2 evaporator temperature D - - C / F - - XV 83 (R) 83 Analog b15 Driver 2 evaporator pressure D - - bar - - XV 84 (R) 84 Analog b16 Driver 2 superheating D - - C / F - - XV 85 (R) 85 Analog b17 Driver 2 saturation temperature D - - C / F - - XV 86 (R) 86 Analog b18 Driver 2 valve position D % - - XV 87 (R) 87 Analog b19 Temp. probe at the outlet of the external coil c1 D - - C / F - - V 88 (R) 88 Analog b20 Temp. probe at the outlet of the external coil c12 D - - C / F - - XV 89 (R) 89 Analog Table 4.c Compressor setting parameters (c*) display indicat. parameter and description default level min. max. U.O.M. variat. def. visibility supervis. variable Modbus variabile type c01 Min. compressor ON time U s (R/W) 153 Integer c02 Min. OFF time compressor U s (R/W) 154 Integer c03 Delay between 2 starts of the same compressor U s (R/W) 155 Integer c04 Delay between starts of the 2 compressors U s (R/W) 156 Integer c05 Delay between 2 shut-downs of the 2 compressors U s (R/W) 157 Integer c06 Delay at start-up U s (R/W) 158 Integer c07 Delay in switching on the compressor after switching on the pump/inlet U s (R/W) 159 Integer fan (air/air) c08 Delay in switching OFF the compressor after switching OFF the pump/ U min (R/W) 160 Integer inlet fan (air/air) c09 Maximum compressor operating time in tandem U 0 60 min (R/W) 161 Integer c10 Compressor 1 timer D hours (R) 90 Analog c11 Compressor 2 timer D hours (R) 91 Analog c12 Compressor 3 timer D hours (R) 92 Analog c13 Compressor 4 timer D hours (R) 93 Analog c14 Operation timer threshold U hours (R/W) 162 Integer c15 Hour counter evaporator pump/fan 1 D hours (R) 94 Analog c16 Hour counter condenser backup pump/fan 2 D hours (R) 95 Analog c17 Minimum time between 2 pump starts U min (R/W) 163 Integer c18 Minimum pump ON time U 1 15 min (R/W) 164 Integer Table 4.d µc rel

21 4.3.5 Defrost setting parameters (d*) ENGLISH display indicat. parameter and description default level min. max. U.O.M. variat. def. visibility supervis. variable Modbus variabile type d01 Defrosting cycle/condenser antifreeze U 0 1 Flag (R/W) 7 Digital 0= no; 1= sì, con sbrinamento unifi cato yes, with shared defrosting d02 Time or temp.- press. based defrosting U 0 2 Flag 1 0 D 90 (R/W) 218 Integer 0= time 1= temp. - press 2= pressure start, temperature end d03 Start defrosting temperature U d04 C/ F DN 19 (R/W) 19 Analog Condenser antifreeze alarm set point Start defrosting pressure /11 d04 bar DP 18 (R/W) 18 Analog d04 End defrosting temperature U d C DN 21 (R/W) 21 Analog End defrosting pressure d03 /12 bar DP 20 (R/W) 20 Analog d05 Min. time to start a defrosting cycle U s 1 10 D 37 (R/W) 165 Integer d06 Min. duration of a defrosting cycle U s 1 0 D 38 (R/W) 166 Integer d07 Max. duration of a defrosting cycle U min 1 5 D 39 (R/W) 167 Integer d08 Delay between 2 defrosting cycle requests within the same circuit U min 1 30 D 40 (R/W) 168 Integer d09 Defrosting delay between the 2 circuits U min 1 10 D 41 (R/W) 169 Integer d10 Defrost by external contact F 0 3 Flag 1 0 D 42 (R/W) 170 Integer 0= disables function 1= external contact start 2= external contact end 3= external contact start and end d11 Antifreeze heaters activated while defrosting U 0 1 Flag 1 0 D 9 (R/W) 9 Digital 0= Non presenti/not present; 1= Presenti/Present d12 Waiting time before defrosting F 0 3 min 1 0 D 43 (R/W) 171 Integer d13 Waiting time after defrosting F 0 3 min 1 0 D 44 (R/W) 172 Integer d14 End defrosting with 2 refrigerating circuits F 0 2 Flag 1 0 D 45 (R/W) 173 Integer 0= Indipendent 1= If both at end defrost 2= If at least one at end defrost d15 Start defrost with 2 circuits F 0 2 Flag 1 0 D 46 (R/W) 174 Integer 0= Indipendent 1= If both at start defrost 2= If at least one at start defrost d16 Forced ventilation time at the end of the defrosting F s 1 0 D 47 (R/W) 175 Integer d17 Defrost with compressors OFF F C/ F D 22 (R/W) 22 Analog Table 4.e Fan setting parameters (F*) display indicat. parameter and description default level min. max. U.O.M. variat. def. visibility supervis. variable Modbus variabile type F01 Fan output F 0 1 Flag (R/W) 10 Diigital 0= absent 1= present F02 Fan operating mode U 0 3 Flag 1 0 F 48 (R/W) 176 Integer 0= always ON 1= depending ON the compressor (in parallel operation mode) 2= depending ON the compressors in ON/OFF control 3= depending ON the compressors in speed control mode F03 Min. voltage threshold for Triac F 0 F04 step 1 35 F 49 (R/W) 177 Integer F04 Max. voltage threshold for Triac F F step 1 75 F 50 (R/W) 178 Integer F05 Temp. value for min. speed Cooling U C FN 24 (R/W) 24 Analog Pressure value for min. speed Cooling /11 /12 bar FP 23 (R/W) 23 Analog F06 Differential value for max. speed Cooling U C/ F FN 26 (R/W) 26 Analog Pressure value for max. speed Cooling 0 50 bar FP 25 (R/W) 25 Analog F07 Fan shut-down differential in Cooling mode U C/ F FN 28 (R/W) 28 Analog Fan shut-down pressure in Cooling mode 0 F5 bar FP 27 (R/W) 27 Analog F08 Temperature value for max speed in Heating mode U C FN 30 (R/W) 30 Analog Pressure value for max speed in Heating /11 /12 bar FP 29 (R/W) 29 Analog F09 Temperature value for max. speed in Heating mode U C/ F FN 32 (R/W) 32 Analog Pressure value for max speed in Heating 0 F08 bar FP 31 (R/W) 31 Analog F10 Temp. to turn OFF the fan in Heating 0.1 U 0 F08 C/ F FN 34 (R/W) 34 Analog Pressure to turn OFF the fan in Heating bar FP 33 (R/W) 33 Analog F11 Fan starting time U s 1 0 F 51 (R/W) 179 Integer F12 Triac impulse duration (fan start) F 0 10 s 1 2 F 52 (R/W) 180 Integer F13 Fan management in defrost mode F 0 2 Flag 1 0 F 53 (R/W) 181 Integer 0= Disabled fans 1= Fan in chiller mode 2= Max. speed after defrost F14 Fan on time when starting in high condensing temperature U S 1 0 FN 91 (R/W) 219 Integer Table 4.f 28 µc rel

22 4.3.7 Unit setting parameters (H*) display indicat. parameter and description default level min. max. U.O.M. variat. def. visibility supervis. variable Modbus variabile type H01 Unit model 0= air_air unit 1= air_air heat pump 2= air_water chiller 3= air_water heat pump 4= water_water chiller 5= water_water heat pump with reversal on gas circuit 6= water_water heat pump with reversal on water circuit 7= condensing unit 8= reverse-cycle condensing unit 9= water-cooled condensing unit 10= reverse-cycle water-cooled condensing unit F 0 10 Flag (R/W) 182 Integer H02 Number of condensers 0=1 circuit; 1=2 circuits F 0 1 Flag 1 0 F 12 (R/W) 12 Digital H03 Number of evaporators 0=1 evaporator 1=2 evaporators F 0 1 Flag (R/W) 13 Digital H04 Number of compressors per circuit F 0 5 Flag (R/W) 183 Integer 0=1 comp. ON 1 circuit (single circuit) 1=2 comp. in tandem ON 1 circuit (single circuit) 2=1 comp. per circuit, 2 circuits (two circuits) 3=2 comp. in Tandem, 2 circuits (two circuits) 4=1 compressor and 1 Capacity step in one circuit 5=1 compressor and 1 capacity Step per circuit H05 Pump/outlet fan (Air/Air) mode (output N2) F 0 5 Flag (R/W) 184 Integer 0= absent 1= always ON 2= ON upon request of the controller 3= ON upon request of the controller and for set time H06 Cooling/Heating digital input U 0 1 Flag (R/W) 14 Digital 0= absent 1= present H07 ON/OFF digital input U 0 1 Flag (R/W) 15 Digital 0= absent 1= present H08 µc 2 network confi guration F 0 3 Flag (R/W) 185 Integer 0= µc 2 only 1= µc 2 + valve 2= µc 2 + exp. 3= µc 2 +exp.+valve H09Lock keypad U 0 1 Flag (R/W) 16 Digital 0= disabled 1= enabled H10Serial address U (R/W) 186 Integer H11 Output modes (see Table 5.3 and following pag. 56) F 0 12 Flag (R/W) 187 Integer H12 Capacity- control logic valve and inversion valve F 0 3 Flag (R/W) 188 Integer 0= Both normally closed 1= Both normally open 2= Inversion valve normally open and capacity-control valve normally closed 3= Inversion valve normally closed and capacity-control valve normally open H21 Second pump function F 0 4 int (R/W) 269 Integer 0= Disabled 1= Backup and weekly rotation 2= Backup and daily rotation 3= Condensing control on corresponding set point 4= Condensing control always on H22 Disable load default values F 0 1 Flag (R) 18 Digital 0= Function disabled 1= Function enabled H23 Enable Modbus protocol F 0 1 Flag Digital Table 4.g ENGLISH µc rel

23 4.3.8 Alarm setting parameters (P*) ENGLISH display indicat. parameter and description default level min. max. U.O.M. variat. def. visibility supervis. variable Modbus variabile type P01 Flow switch alarm delay when starting the pump U s (R/W) 191 Integer P02 Flow switch alarm delay during steady operation U s (R/W) 192 Integer P03 Low pressure alarm delay at start-up U s (R/W) 193 Integer P04 Enable part load in high pressure U 0 3 int 1 0 P 66 (R/W) 194 Integer P05 Alarm reset 0= HP1-2/LP1-2/A1-2/Lt manual 1= HP1-2/LP1-2/A1-2/Lt automatic 2= HP1-2/A1-2/Lt manual LP1-2 automatic 3= HP1-2 manual LP1-2/A1-2/Lt automatic 4= HP1-2/LP1-2 manual A1-2/Lt automatic 5= HP1-2/LP1-2 (thrice per hour) manual A1-2/Lt automatic F 0 6 Int (R/W) 195 Integer 6= HP1-2/LP1-2 (thrice per hour) manual; A1-2/Lt manual P06Cooling/heating logic F 0 1 Flag (R/W) 19 Digital 0=: Chiller, : Heat pump 1=: Heat pump, : Chiller P07 Low pressure alarm from transducer F 0 1 Flag 1 0 P 68 (R/W) 196 Integer 0= Disabled 1= Enabled P08 Digital input 1 selection F 0 22 Flag (R/W) 197 Integer 0= N 1=FL man. 2=FL auto. 3=TP man. 4=TP auto 5= TC1 man. 6= TC1 auto. 7= TC2 man. 8= TC2 auto. 9= Cool/Heat. 10= Cool/Heat. Delayed 11= LA man. 12= LA auto. 13= 2 Set 14= 2 Set timer 15= stop defrost c. 1 16= stop defrost c. 2 17= start defrost c. 1 18= start defrost c. 2 19= step 1 20 = step 2 21= step 3 22= step 4 P09 Digital input 2 selection F 0 22 Flag (R/W) 198 Integer P10 Digital input 6 selection F 0 22 Flag 1 0 X 71 (R/W) 199 Integer P11 Digital input 7 selection F 0 22 Flag 1 0 X 72 (R/W) 200 Integer P12 Digital input 10 selection F 0 22 Flag 1 0 X 73 (R/W) 201 Integer P13 Confi guration of B4 as P8 if /4=1 (digital input) F 0 22 Flag (R/W) 202 Integer P14 Confi guration of B8 as /8=1 (digital input) F 0 22 Flag 1 0 X 75 (R/W) 203 Integer P15 low pressure alarm confi guration L F 0 1 Flag (R/W) 204 Integer 0= not active with compressor OFF 1= active with compressor OFF P16 High temperature alarm set U C (R/W) 38 Analog P17 High temperature alarm delay at start-up U min (R/W) 205 Integer P18 High pressure alarm set from transducer F bar P 39 (R/W) 39 Analog P19 System low temperature alarm set point U C (R/W) 40 Analog P20 Enable system start-up protection U 0 1 Flag (R/W) 20 Digital 0= Disabled 1= Enabled P21 Alarm relay management 0= normally de-activated 1= normally activated F 0 1 Flag (R/W) 8 Digital Table 4.h Control setting parameters (r*) display indicat. parameter and description default level min. max. U.O.M. variat. def. visibility supervis. variable Modbus variabile type r01 Cooling set point D r13 r14 C/ F (R/W) 41 Analog r02 Cooling differential D C/ F (R/W) 42 Analog r03 Heating set point D r15 r16 C/ F (R/W) 43 Analog r04 Heating differential D C/ F (R/W) 44 Analog r05compressor rotation 0= disabled; 1= FIFO type 2= con controllo ore/hour control F 0 3 fl ag (R/W) 206 Integer 3= direct relation between (D.I. and compressors D.O.) r06 Type of compressor control F 0 4 fl ag (R/W) 207 Integer 0= proportional on inlet 1= proportional on inlet + dead zone 2= proportional on outlet 3= proportional on outlet + dead zone 4= time on outlet with dead zone r07 Dead zone differential F C/ F (R/W) 45 Analog r08 Activation delay at lower limit of r07 F s (R/W) 208 Integer r09 Activation delay at upper limit of r07 F s (R/W) 209 Integer r10 Deactivation delay at lower limit of r12 F s (R/W) 210 Integer r11 Deactivation delay at upper limit of r12 F s (R/W) 211 Integer r12 Compressor deactivation differential F C/ F (R/W) 46 Analog r13 Min. Cooling set point U r14 C/ F (R/W) 47 Analog r14 Max. Cooling set point U r13 C (R/W) 48 Analog r15 Min. Heating set point U r16 C/ F (R/W) 49 Analog r16 Max. Heating set point U r C (R/W) 50 Analog 30 µc rel