ENERGY LIGHT USER S GUIDE ENERGY LIGHT USER S GUIDE

ENERGY LIGHT USER S GUIDE Release January 2001

CONTENTS 1.0 GENERAL CHARACTERISTICS... 4 1.1 MAIN CHARACTERIS TICS... 4 2.0 USER INTERFACE (CODE C5121230)... 5 2.1 DISPLAY... 5 2.2 MEANING OF THE LEDS... 5 3.0 MEANING OF THE BUTTONS... 6 4.0 SELECTING THE OPERATING MODE FROM THE KEYPAD... 7 5.0 SETTING THE SET POINT... 8 6.0 SETTING THE USER PARAMETERS... 9 7.0 ALARM DIAGNOSTICS AND CORRESPONDING BLOCKS... 11 7.1 ALARM TABLE (TAB. 7.0)... 12 7.2 ALARM RESET TABLE, STANDARD UNIT... 12 7.3 ALARM RESET... 13 7.4 DESCRIPTION OF THE ALARMS... 13 8.0 COMPRESSOR AND PUMP OPERATING HOUR COUNTER... 15 9.0 ANALOGUE INPUTS... 15 10.0 DIGITAL INPUTS... 16 11.0 OUTPUT CONFIGURATION... 17 11.1 OPTIONAL OUTPUT... 17 11.2 SERIAL OUTPUT... 17 12.0 PARAMETER PROGRAMMING KEY... 18 12.1 COPYING THE UNIT EPROM TO THE KEY... 18 12.2 COPYING THE KEY TO THE UNIT EPROM... 18 13.0 CONFIGURING THE OPERATING MODE... 19 13.1 SELECTING THE OPERATING MODE FROM THE ANALOGUE INPUT... 19 14.0 COMPRESSORS... 20 14.1 COMPRESSOR TIMING... 21 14.2 COMPRESSOR ON - OFF SEQUENCE... 22 14.3 COMPRESSOR IN COOLING MODE... 22 14.4 COMPRESSOR IN HEATING MODE... 23 15.0 SET POINT COMPENSATION... 24 16.0 CONDENSATION FAN... 25 16.1 FAN CONFIGURATION... 25 16.2 PROPORTIONAL FAN SPEED MANAGEMENT... 25 16.3 CONDENSATION CONTROL IN COOLING... 26 16.4 PRE-VENTILATION... 26 16.5 CONDENSATION CONTROL IN HEATING... 27 17.0 FAN SPEED MANAGEMENT BOARDS... 28 17.1 3.1A FAN MODULE (CODE C5111026)... 28 17.2 10.1A FAN MODULE (CODE C5111027)... 28 17.3 CONNECTION TO THE ENERGY LIGHT ELECTRONIC CONTROL... 29 18.0 CALIBRATING THE CONDENSATION FANS... 30 19.0 REVERSING VALVE... 31 19.1 REVERSING VALVE IN COOLING... 31 19.2 REVERSING VALVE IN HEATING... 31 20.0 REMOTE HEATING/COOLING SELECTION... 31 21.0 WATER PUMP... 32 Release Jan. 2001 Energy Light 2/67

21.1 WATER PUMP WITH ON-CALL OPERATION... 32 21.2 WATER PUMP WITH CONTINUOUS OPERATION... 33 21.3 WATER PUMP IN CYCLICAL OPERATION... 33 22.0 CONFIGURING THE INTERNAL ANTIFREEZE HEATING ELEMENTS / INTEGRATION... 34 22.1 EXTERNAL ANTIFREEZE HEATING ELEMENTS... 35 22.2 BOILER DEPENDENT ON EXTERNAL TEMPERATURE... 35 22.3 BOILER IN INTEGRATION MODE... 35 22.4 BOILER IN HEATING MODE... 35 22.5 SUPPORT HEATING ELEMENT ACTIVATION... 36 23.0 INTERNAL FAN... 37 23.1 INTERNAL FAN IN COOLING... 37 23.2 INTERNAL FAN IN HEATING... 38 24.0 HOT START FUNCTION... 38 25.0 DEFROSTING... 40 25.1 START DEFROST... 40 25.2 END DEFROST... 41 26.0 USING THE PRESSURE TRANSDUCERS... 42 26.1 CONNECTING THE PRESSURE PROBES... 43 27.0 REMOTE KEYPADS... 44 27.1 REMOTE KEYPAD WITH DISPLAY... 45 27.2 REMOTE KEYPAD WITH LEDS... 45 28.0 LOW VOLTAGE CONNECTIONS... 46 28.1 HEAT PUMP CONNECTION WITH REMOTE COOLING/HEATING SWITCH... 46 28.2 CHILLER CONNECTION WITH EXTERNAL PROBE FOR SET-POINT COMPENSATION... 46 29.0 POWER CIRCUIT CONNECTIONS... 47 29.1 ELECTRICAL CONNECTION WARNINGS... 48 30.0 ELECTRICAL CONNECTIONS TO CONTROLLED DEVICES... 49 31.0 SERIAL CONNECTION TO SUPERVISOR OR PC... 50 32.0 PARAMETERS... 51 32.1 CONFIGURING PARAMETER AND LABEL VISIBILITY... 52 32.2 DESCRIPTION OF THE UNIT CONFIGURATION PARAMETERS... 52 32.3 TABLE SUMMARISING THE PARAMETERS (VISIBILITY AND UNITS OF MEASURE)... 61 33.0 TEMPERATURE - NTC PROBE RESISTANCE CONVERSION TABLE... 65 34.0 SPARE PART CODES FOR ENERGY LIGHT OCTOBER 2000... 65 Release Jan. 2001 Energy Light 3/67

1.0 GENERAL CHARACTERISTICS ENERGY LIGHT USER S GUIDE Energy Light is a compact device which allows the control of the following types of air-conditioning units: air-air, air/water, water/water and motor-condensing, single-circuit, with 1 or 2 compressors (steps). The condensation fan speed can be controlled proportionately for currents of up to 2A without using external devices. 1.1 MAIN CHARACTERISTICS Thermoregulation of the outlet water Condensation control Input configurable for NTC or 4-20mA probe (via parameter) Automatic change-over Boiler or built-in external heater control for heating Internal ventilation control with up to 3 steps in the air-air version Dynamic set point Parameter setting from the keypad or by personal computer Hardware key to upload or download parameter maps Remote keypad (up to 100m) that can be connected directly without serial interfaces 0-10V or 4-20mA output (optional internal board) Menu-based user interface with 2 different levels of access via password Complete configuration of interface menu via PC Release Jan. 2001 Energy Light 4/67

2.0 USER INTERFACE 1 2 210A C5121230 2.1 DISPLAY In normal operating conditions the temperature at the evaporator inlet (BT1) is displayed, in tenths of degrees Celsius, or the alarm code if at least one alarm is active. In the case of more than one active alarm, the first of these is displayed, according to table TAB 7.0. If thermoregulation is not analogue, and depends on the status of a digital input (ST1 or ST2, configured as digital inputs) the label On or Off is displayed, depending on status of the thermoregulator. In menu mode the display depends on the current position. Labels and codes are used to help the user identify the type of display set. 2.2 AIR-AIR MACHINES To simplify the user interface in the air-air versions, by setting parameter H53 = 1, the set point relating to the selected mode is normally displayed; pressing the UP and DOWN buttons on the remote keypad directly modifies the set point for the selected mode. The local keypad cannot be used to directly modify the set point. 2.3 MEANING OF THE LEDS Compressor LED ON if the compressor is active OFF if compressor is off BLINK if timing is in progress Compressor 2 LED (or capacity control status) ON if the compressor (capacity control) is active OFF if compressor (capacity control) is off BLINK if timing is in progress Defrost LED ON if defrosting is active OFF if defrosting is disabled or complete BLINK if timed defrosting interval is set Heater/boiler LED ON if the internal antifreeze heater or the boiler are active OFF if these are off ON if control in Heating mode. In display compressor or pump operating hour mode, if on, indicates that the value displayed must be multiplied by 100 (hours*100). ON if control in Cooling mode If neither the HEAT LED nor the COOL LED are on, the control is in STAND-BY mode Release Jan. 2001 Energy Light 5/67

3.0 MEANING OF THE BUTTONS ENERGY LIGHT USER S GUIDE 1. SELECTS THE OPERATING MODE 2. IN MENU MODE BECOMES THE SCROLL UP LABEL BUTTON 3. INCREASES THE VALUE OF THE SELECTED PARAMETER 1. HELD PRESSED FOR MORE THAN 2 SECONDS THE CONTROLLER GOES FROM ON TO OFF AND FROM OFF TO ON 2. ONE SINGLE PRESS RESETS ALL THE INACTIVE MANUALLY-RESET ALARMS; THE INTERVENTION TIME COUNTERS ARE ALSO RESET, EVEN IF THESE ARE NOT ACTIVE 3. IN MENU MODE BECOMES THE SCROLL DOWN LABEL BUTTON 4. INCREASES THE VALUE OF THE SELECTED PARAMETER 1. PRESSING AND RELEASING BOTH BUTTONS WITHIN 2 SECONDS GOES DOWN A LEVEL IN THE CONFIGURATION MENU 2. HOLDING BOTH BUTTONS FOR MORE THAN 2 SECONDS GOES UP A LEVEL IN THE CONFIGURATION MENU 3. IF THE LAST LEVEL OF A MENU IS DISPLAYED, PRESSING AND RELEASING THE BUTTONS TOGETHER WITHIN 2 SECONDS GOES UP A LEVEL Release Jan. 2001 Energy Light 6/67

4.0 SELECTING THE OPERATING MODE FROM THE KEYPAD IF HEATING MODE IS ENABLED H28=1 Starting from Stand-by each pressing of the mode button sees the following sequence: STAND-BY COOOLING OPERATION HEATING OPERATION STAND-BY NOTES : - Once the operating mode has been changed, wait 2 seconds for the reversing valve to change status. - To switch from Cooling to Stand-by without the 4-way valve changing status, press the Mode button twice consecutively within 2 seconds. IF HEATING MODE IS NOT ENABLED H28=0 Starting from Stand-by each pressing of the mode button sees the following sequence: STAND-BY COOOLING MODE STAND-BY Release Jan. 2001 Energy Light 7/67

5.0 SETTING THE SET POINT ENERGY LIGHT USER S GUIDE To access the unit regulation Set-point proceed as follows: (in normal operating conditions the display of the Energy Light electronic control always shows the temperature at the evaporator inlet probe BT1). Press both buttons together for less than 2 seconds to access the first level menu display. Press both buttons again to access the second level, which allows the Heating and Cooling Set Points to be modified. o Use the Scroll Up or Scroll Down buttons to modify the desired Set Point (Heating or Cooling) Press both buttons again for less than 2 seconds to access the third level, which shows the previously stored Set Point o Use the Scroll Up or Scroll Down buttons to set the new Set Point value. Press both buttons again for less than 2 seconds to save the changes and return to the display of the Set Point. Press both buttons again for more than 2 seconds to return to the main screen, going up one level at a time. Alternatively, performing no operation for 5 minutes, the electronic control automatically returns to the main screen. Release Jan. 2001 Energy Light 8/67

6.0 SETTING THE USER PARAMETERS ENERGY LIGHT USER S GUIDE To access all the unit configuration parameters, the 1st configuration level must be accessed by pressing the MODE and ON-OFF buttons together Use the SCROLL UP button to move around the 1st level until reaching the label called PSS Press both the MODE and ON-OFF buttons together to access the 2nd configuration level. The display shows the numeric value 0 Use the SCROLL UP button to set the numeric value 47, corresponding to the user password. All unit configuration parameters can now be accessed. NOTE: ALL THE UNIT CONFIGURATION PARAMETERS CAN BE ACCESSED USING THE SAME METHOD FOR REACHING THE SETTING OF THE SET POINT AND THE USER PASSWORD, WITH REFERENCE TO THE FOLLOWING TABLE Release Jan. 2001 Energy Light 9/67

Release Jan. 2001 Energy Light 10/67

6.1 TABLE FOR ACCESSING THE PARAMETERS AND THE CONFIGURATION LABELS To move around inside the levels, press the Mode and On off buttons together 1) Pressing and releasing both buttons within 2 seconds goes down one level in the configuration menu 2) Holding both buttons pressed for more than 2 seconds goes up one level in the configuration menu 3) If the last level of a menu is displayed, pressing together and then releasing the buttons within 2 seconds goes back one level

7.0 ALARM DIAGNOSTICS AND CORRESPONDING BLOCKS 7.1 ALARM TABLE (TAB. 7.0) CODE TYPE OF FAULT Comp. 1 Comp. 2 External fan BLOCKS Internal fan Pump Heating element E00 REMOTE OFF X X X X X X X E01 MAXIMUM PRESSURE (digital) X X E02 MINIMUM PRESSURE (digital) X X X X E41 FLOW-SWITCH X X X X? E03 CIRC. BREAK COMPRESSOR 1 X E04 CIRC. BREAK EXTERNAL FAN X X X X E05 ANTIFREEZE X X X E43 INTERNAL ANTIFREEZE X X E11 MAXIMUM PRESSURE (analogue) X X E12 MINIMUM PRESSURE (analogue) X X X X E44 UNIT DISCHARGED X X X X E45 CONFIGURATION X X X X X X X E06 PROBE ST2 FAULT X X X X X X X E42 PROBE ST4 FAULT X X X X X X X E07 PROBE ST3 FAULT X X X X X X X E40 PROBE ST1 FAULT X X X X X X X E13 CIRC. BREAK COMPRESSOR 2 X E46 HIGH TEMPERATURE X X Boiler? = The flow alarm blocks the output corresponding to the circulating pump, only if this is configured for manual reset (A06=0) 7.2 ALARM RESET TABLE, STANDARD UNIT CODE TYPE OF FAULT RESET E00 REMOTE OFF SIGNAL E01 MAXIMUM PRESSURE (digital) MANUAL E02* MINIMUM PRESSURE (digital) AUTOMATIC (After 5 signals becomes manual reset) E41* FLOW-SWITCH AUTOMATIC (After 5 signals becomes manual reset) E03* CIRC. BREAK COMPRESSOR 1 MANUAL E04* CIRC. BREAK EXTERNAL FAN MANUAL E05* ANTIFREEZE MANUAL E43* INTERNAL ANTIFREEZE MANUAL E11 MAXIMUM PRESSURE (analogue) MANUAL E12* MINIMUM PRESSURE (analogue) AUTOMATIC (After 5 signals becomes manual reset) E44 UNIT DISCHARGED MANUAL E45 CONFIGURATION MANUAL E06 PROBE ST2 FAULT AUTOMATIC E42 PROBE ST4 FAULT AUTOMATIC E07 PROBE ST3 FAULT AUTOMATIC E40 PROBE ST1 FAULT AUTOMATIC E13 CIRC. BREAK COMPRESSOR 2 MANUAL E46 HIGH TEMPERATURE AUTOMATIC Release Jan. 2001 Energy Light 12/67

* The asterisk alongside the code of some alarms in the above table means that the alarm reset can be configured via parameter. The user can decide to have manual reset, or define a number of alarms after which the alarm reset changes from automatic to manual. NOTE: The alarm signals are counted only if more than 225 seconds elapse between one signal and the next. 7.3 ALARM RESET To reset the manual reset alarms, once having eliminated the cause of the alarm, proceed as follows: PRESS JUST ONCE TO RESET ALL THE INACTIVE MANUAL RESET ALARMS; IN THE DISPLAY PHASE, ALL THE INTERVENTION TIME COUNTERS ARE ALSO RESET, EVEN IF THE CORRESPONDING SIGNALS ARE NOT ACTIVE 7.4 DESCRIPTION OF THE ALARMS The control is able to effect a complete diagnosis of the unit, signalling a series of alarms. The alarms which feature the event time counter can be changed from automatic to manual reset. The count of the event times occurs each 225 seconds. This means that if the number of event-times is set to 3, the time when the alarm changes from automatic to manual reset is between 2*225 seconds and 3*225 seconds. If the alarm is active more than once within a sampling period (225 seconds), this is counted just once. The manual reset alarms are reset by pressing and releasing the on-off button E00: Remote OFF The ON OFF digital input, if active, switches off all the utilities and the display shows E00. E01: High pressure alarm If input ID1 is active, the alarm is active. The alarm is always manual reset. E02: Low pressure alarm If input ID2 is active, the alarm is active. The alarm is automatic reset. If the number of alarm event times is equal to A02, it changes to manual reset. The alarm is not active for a period A01 from the start-up of the compressor or the reversal of the 4-way valve. In defrosting, if A24 = 0 the alarm is not active. E03: Compressor circuit breaker alarm If the input configured as the compressor circuit breaker input is active, the alarm is active. The alarm reset is automatic. If the number of event/times is equal to parameter A07 the alarm must be reset manually. The alarm diagnosis is not active for a period equal to parameter A08 from the start-up of the compressor. E04: Condenser fan circuit breaker If the input configured as the fan circuit breaker input is active, the alarm is active. The alarm reset is automatic. If the number of event/times is equal to parameter A09 the alarm must be reset manually. E05: Antifreeze alarm The alarm is active if parameter H06=1 (Probe ST2 configured as antifreeze probe). If the analogue input ST2 has a value less than A11 the alarm is active. It is deactivated if the temperature ST2 is greater than A11+ A12. The alarm is automatic reset. If the number of event times of the alarm is equal to A13 it changes to manual reset. The antifreeze alarm is not active for a period A10 from switching on in Heating mode. The above is valid only if the alarm is detected with the unit off. E06: Probe ST2 alarm The alarm is active if a probe, configured as an analogue input, is short-circuited or interrupted. The alarm is also active if the upper limit (100 C) or the lower limit (-50 C) of the probes is exceeded. E07: Probe ST3 alarm The alarm is active if a probe, configured as an analogue input, is short-circuited or interrupted. The alarm is also active if the upper limit (100 C) or the lower limit (-50 C) of the probes is exceeded. E11: High pressure/high temperature alarm The alarm is active if at least one probe is configured as a probe for condensation control. Release Jan. 2001 Energy Light 13/67

If the condensation probe has a value greater than A14 the alarm is active. It is deactivated if the temperature/pressure is less than A14 - A15. The alarm is always manually reset. E12: Low pressure/low temperature alarm The alarm is active if at least one probe is configured as a probe for condensation control. If the condensation probe has a value lower than A17 the alarm is active. It is deactivated if the temperature/pressure is greater than A17 + A18. If the number of event/times of the alarm is equal to A19, it changes to manual reset. The alarm is not active for a period A16 from the start-up of the compressor or the reversal of the 4-way valve. E13: Compressor 2 circuit breaker alarm If the input (configured as compressor 2 circuit breaker) is active, the alarm signal is activated. The alarm reset is automatic. If the number of event/times is equal to parameter A08 the alarm must be reset manually. E40: Probe ST1 alarm The alarm is active if a probe, configured as an analogue input, is short-circuited or interrupted. The alarm is also active if the upper limit (100 C) or the lower limit (-50 C) of the probes is exceeded E41: Flow-switch alarm If the input configured as the flow-switch input is active for a period equal to A04, the alarm is activated. The alarm reset is automatic. If the number of event/times of the alarm is equal to parameter A06 the alarm must be reset manually. The alarm diagnosis is not active for a period equal to parameter A03 from the start-up of the pump. E43: Secondary antifreeze alarm The alarm diagnosis is active if H07=4 (Probe ST3 configured as antifreeze probe for automatic reverse water/water units). If the analogue input ST3 has a value lower than A11 the alarm is active. It is deactivated if the temperature ST2 is greater than A11+ A12. The alarm is automatic reset. If the number of event times of the alarm is equal to A13 it changes to manual reset. The alarm is not active for a period A10 from switching on using the ON-OFF button or from entering heating mode, or from the ON-OFF digital input. E42: Probe ST4 alarm The alarm is active if a probe, configured as an analogue input, is short-circuited or interrupted. The alarm is also active if the upper limit (100 C) or the lower limit (-50 C) of the probes is exceeded. E44: Unit discharged alarm In all operating modes, except for operation with the boiler active and defrosting on, the unit is checked for any leaks in the gas circuit or faults in the reversing valve in heat pump operation. The regulator is active if A23=1. The unit discharged alarm is always manual reset. In Heating if ST2-ST1(or ST3)<A20 or in Cooling if ST1(or ST3)-ST2<A20 for a continuous period greater than A21 the alarm is activated. The count of the time is reset on each change of mode and when the compressor is off, and is not active for the period of parameter A22 from the start-up of the compressor. E45: Configuration error In the case where ST1 is configured as a heating request digital input and ST2 as cooling request, the alarm is active when both the inputs are active. E46: Over-temperature alarm This is active if the temperature value ST1 remains above A25 for a continuous period equal to A26. In this way, the high temperature/pressure conditions are signalled without blocking the unit. These conditions do not involve the intervention of the pressure switch, and can thus cause accelerated wear or damage to the unit. Release Jan. 2001 Energy Light 14/67

8.0 COMPRESSOR AND PUMP OPERATING HOUR COUNTER The device stores in non-volatile memory the operating hours of the pump and the compressor. The internal resolution is in minutes. In the case of power failures the last fraction of time recorded is set to zero. The display is accessed via the corresponding menu. For values below 999 hours the entire value is displayed, while higher values are displayed as hours/100 with the HEAT LED on. The hours are set to zero by pressing the DOWN button for 2 seconds while the operating hours are shown. 9.0 ANALOGUE INPUTS There are 4 analogue inputs: 3 NTC-type transducers, 1 transducer configurable as NTC or 4-20mA. The probes ST1-ST4 can be configured according to the following table Par. Description H05 Configuration analogue input ST1 H06 Configuration analogue input ST2 H07 Configuration analogue input ST3 H08 Configuration analogue input ST4 Value 0 1 2 3 4 5 Probe absent NTC input Digital input, heating Digital input, Not allowed Not allowed water/air inlet request thermo-regulator request Probe absent NTC input, water/air, Digital input, cooling Not allowed Not allowed Not allowed antifreeze outlet request Probe absent Condensation NTC input Probe absent Condensation NTC Input Condensation 4-20mA input Multifunction digital input Dynamic set-point 4-20mA input Ext. temp NTC input NTC input, antifreeze for water/water machines with GAS reversibility Thermo-regulator NTC probe in Heating mode for water/water machines with water reversibility Not allowed Not allowed If input ST3 is defined as an 4-20mA input the pressure input full scale parameter value is also significant. H09= Maximum input value; set the value corresponding to current of 20 ma Release Jan. 2001 Energy Light 15/67

10.0 DIGITAL INPUTS There are 5 not-live digital inputs plus ST1, ST2 and ST4, if these are configured as digital inputs. The polarity of the inputs is defined by 8 parameters, 5 for the digital inputs and 3 for the analogue inputs if defined as digital. Table of digital input polarity Parameter Description Value 0 1 H10 Polarity digital input ID1 Active if closed Active if open H11 Polarity digital input ID2 Active if closed Active if open H12 Polarity digital input ID3 Active if closed Active if open H13 Polarity digital input ID4 Active if closed Active if open H14 Polarity digital input ID5 Active if closed Active if open H15 Polarity input ST1 (if digital) Active if closed Active if open H16 Polarity input ST2 (if digital) Active if closed Active if open H17 Polarity input ST4 (if digital) Active if closed Active if open Inputs ID1 and ID2 can not be configured ID1: High pressure input ID2: Low pressure input The functions of inputs ID3, ID4, ID5 and ST4 can be configured by parameter Table of digital input configuration Par. Description H18 H19 H20 H21 Configuration digital input ID3 Configuration digital input ID4 Configuration digital input ID5 Configuration input ST4 (if digital) Value 0 1 2 3 4 5 6 Circuit breaker Remote Circuit breaker Request Fan circuit breaker Flow-switch Remote OFF to comp. 1 Heat/Cool comp. 2 2nd step Circuit breaker Remote Circuit breaker Request Fan circuit breaker Flow-switch Remote OFF to comp. 1 Heat/Cool comp. 2 2nd step Circuit breaker Remote Circuit breaker Request Fan circuit breaker Flow-switch Remote OFF to comp. 1 Heat/Cool comp. 2 2nd step Circuit breaker Remote Circuit breaker Request Fan circuit breaker Flow-switch Remote OFF to comp. 1 Heat/Cool comp. 2 2nd step In the case where more than one input is configured with the same value, the function associated to the input follows an OR logic between the inputs in question Release Jan. 2001 Energy Light 16/67

11.0 OUTPUT CONFIGURATION RL1 - compressor, 2A 115VAC/230VAC RL2 - configurable, 2A 115VAC/230VAC RL3 - configurable, 2A 115VAC/230VAC RL4 - configurable, 2A 115VAC/230VAC TK - Triac output configurable 2A 115VAC/230VAC ALL - Triac output 12-24Vac alarm, 500 ma max. The power supply to the alarm output must be insulated from the power supply to the control TK-12DC Low voltage output for commanding the external fan control modules Table of output configuration Par. Description Value 0 1 2 3 H22 Configuration relay RL2 Pump Fan control relay 1 Not allowed Not allowed H23 Configuration relay RL3 Reversal Fan control relay 3 Second compressor or Not allowed capacity-control status H24 Configuration relay RL4 Antifreeze heating Fan control relay 2 Boiler Not allowed elements F01 Fan output mode Proportional fan control Temperature-based ON-OFF fan control Antifreeze heating elements for water/water machines with GAS reversal ON-OFF control of the fan linked to the compressor 11.1 OPTIONAL OUTPUT - The optional output corresponds only to the C5121234 modules with connector for using the second power step. The above-mentioned model can not be used to control the condensation fan directly using the OUT-TC power output, in that a small triac is used (max 500mA) without snubber filter. This type of output can however be used to control an external relay with 230Vac coil for the ON/OFF control of the fan, or using the 12DC TK output, to command the optional phasecutting boards for proportional control of the fan rotation speed. The optional output has the following characteristics, according to the configuration of parameter H25 Par. Description H25 Optional output configuration parameter Open Collector output per second compressor Value 0 1 2 Proportional control of the condensation fan, 4-20 ma Proportional control of the condensation fan, 0-10 V REAR SIDE EXTERNAL RELAY REARSIDE Conn. A Conn. B C5121234 Conn. A Conn. B C5121234 4-20 ma GND 0-10 V - The module C5121230, on the other hand, allows the proportional control of the condensation fan speed for motors with current consumption of up to 2A, using the OUT-TC power output on connector B. 11.2 SERIAL OUTPUT The control features an asynchronous serial output for serial communication with a personal computer, using a dedicated interface module. Release Jan. 2001 Energy Light 17/67

12.0 PARAMETER PROGRAMMING KEY The same connector used for the serial connection can also be used to connect a key for reading or writing parameter maps. Turning the instrument on with the programming key inserted, the new parameter map is copied to the internal memory. The reverse operation can be effected by entering the password 147 12.1 COPYING THE UNIT EPROM TO THE KEY To access the key password, enter the 1st configuration level by pressing the MODE and ON-OFF buttons together Use the SCROLL UP button to move around the 1st level until reaching the label PSS Press the MODE and ON-OFF buttons together to enter the 2nd configuration level. The display shows the numeric value 0 Use the SCROLL UP button to set the numeric value 147. At this point all the parameters written in the unit are copied to the key. 12.2 COPYING THE KEY TO THE UNIT EPROM To copy the key to the unit EPROM, simply insert the key using the corresponding connector, and turn the instrument on. In a brief moment the entire configuration is copied to the unit s EPROM. Once the operation is completed, the display shows the code occ. Release Jan. 2001 Energy Light 18/67

13.0 CONFIGURING THE OPERATING MODE The control has 4 operating states: Cooling, Heating, stand-by, off The selection of the mode depends on both the setting of the keypad, and parameters H27 (operating mode selection), H05 (configuration ST1), H06 (configuration ST2), H28 (heat pump presence). Heat pump presence parameter (H28) 0 = Heat pump not present 1 = Heat pump present Mode selection parameter (H27) 0= Selection from keypad 1= Selection from digital input 2= Selection from analogue input (probe ST4) Heating mode is allowed if the heat pump is present or relay 4 is configured as a boiler output (H24=2) The combination of the different parameters creates the following rules Operating mode Mode selection parameter ST1 configuration parameter The mode is selected from the keypad 0 Other than 2 Other than 2 The mode is selected from the digital input. 1 Other than 2 Other than 2 The mode is selected from the analogue input (ST4) 2 Other than 2 Other than 2 ST2 configuration parameter If input ST1 is active the operating mode is Heating, otherwise Any 2 Other than 2 stand-by If input ST2 is active the operating mode is Cooling, otherwise Any Other than 2 2 stand-by If input ST1 is active the operating mode is Heating, if ST2 is active the operating mode is Cooling, if ST1 and ST2 are both active the control produces an error, if neither are active it is in stand-by Any 2 2 13.1 SELECTING THE OPERATING MODE FROM THE ANALOGUE INPUT The regulator allows the operating mode to be selected using input ST4, measuring the external temperature. The control is active if: Probe ST4 is configured as an external temperature sensor (H08 = 3) The mode selection parameter (H27) is 2 Regulator parameters Heating mode set H29 Mode selection differential H30 MODE SELCTION HEATING MODE SET Mode selection Delta Outdoor temperature For temperatures within the Mode selection differential", the mode can be changed using the keypad, otherwise this is not allowed. Release Jan. 2001 Energy Light 19/67

14.0 COMPRESSORS The compressors (or capacity-control states) are subject to calls based on the thermodynamic conditions of the system. They are switched (on/off) according to the following conditions. Compressor 1 is off if: the compressor blocking alarm is active (TAB 7.0) safety timing operations are in progress timing is in progress between pump on and compressor on there is a start-up delay between two compressors the units is in stand-by or OFF mode probe ST1 configuration parameter = 0 (probe absent) pre-ventilation is active in cooling mode The second compressor (or capacity-control) is available only if: H28 = 2 (two compressors per circuit) H23 = 2 (output RL2 is configured as compressor/capacity-control output) H25 = 0 (open collector output for second compressor/capacity-control) Compressor 2 is on or off according to limits similar to those of compressor 1. If the open collector output is used, an external relay must be used with the connections as described in the following figure. It is important to note that when using the second power step from the optional output, the board code C5121234, which includes this feature, must be used, and that for proportional control of the fans the optional phase-cutting boards must be used. REAR SIDE EXTERNAL RELAY Conn. A Conn. B C5121234 Compressor 2/capacity-control output polarity If relay 3 is configured as an output for the second compressor (H23 = 2), the polarity can be selected using parameter: H51, Output compressor2/capacity-control polarity (only on relay 3) 0 = relay ON if compressor2/capacity-control ON, 1 = relay ON if compressor2/capacity-control OFF. Release Jan. 2001 Energy Light 20/67

14.1 COMPRESSOR TIMING A safety time interval must be respected between one switching-off and the next switching-on (compressor on-off safety time C01), which is also respected when the instrument is switched on. A safety time must also be respected between one switching-on and the next (compressor on-on safety time C02). Compressor ON OFF Safety timing ON/OFF C01 Seconds*10 Safety timing between 2 starts of C02 If two steps are selected (H48= 2), the following conditions must also be respected: On time for the first-second compressor/capacity-control (C06) Off time for first- second compressor (C07). The off time for first-second compressor/capacity-control is not respected if there is a compressor blocking alarm; in this case the shut-down is immediate. Comp. 1 ON OFF Comp. 2 Seconds ON OFF Seconds Time between the start of the different compressors C06 Time between the shut off of the different compressors C07 Release Jan. 2001 Energy Light 21/67

14.2 COMPRESSOR ON - OFF SEQUENCE The start-up of the compressors can be modified according to H50 (compressor start-up sequence): H50 = 0 the compressors are started according to the operating hours (balancing) H50 = 1 first compressor 1 is started, then compressor 2/capacity-control (fixed sequence). If H50 = 0, the compressor with the lower number of operating hours is switched on first, only if this compressor is not subject to: - An active compressor blocking alarm (Tab. 7.0) - Safety timing in progress If H50 = 0, the compressor with the greater number of operating hours is switched off first. If H50 = 1: - Compressor 2/capacity-control is started only if compressor 1 is already on. - Compressor 1 is shut-down only if compressor 2/capacity-control is already off. In the event of an alarm blocking compressor 1, compressor 2/capacity-control is immediately shut-down 14.3 COMPRESSOR IN COOLING MODE If probe ST2 is not configured as a digital input for cooling request (H06=2) or probe ST1 as a digital input for thermoregulator request (H05=3), the compressor is managed according to the temperature measured by probe ST1 and a setpoint which can be programmed from the keypad: ST1 = Temperature of inlet water or intake air. SET-POINT = Cooling set-point set from keypad. C03 = Cooling thermostat hysteresis C05 = Step intervention differential Capacity 2nd Step Set-Point 1st Step Pa C03 Pa C03 Temperature ST1 Pa C05 If parameter H05 = 3 the compressor is switched off and on according to the status of input ST1. If parameter H06 = 2 the compressor is switched off and on according to the status of input ST2. If a digital input is configured as a request for second step (H18 or H19 or H20 or H21 = 6), the corresponding call depends on this input. This function is active only if H05 = 3 or H06 = 2. Release Jan. 2001 Energy Light 22/67

14.4 COMPRESSOR IN HEATING MODE As well as the cases described for Cooling mode, the compressor is also off if: Defrost timings are in progress If probe ST1 is not configured as a digital input for heating request (H05 =2) or as digital input for thermo-regulator request (H05 =3), the compressor is managed according to: the temperature ST3, if the configuration parameter H07 = 5 (for water/water machines with manual reversal) otherwise the temperature ST1 a Heating set-point which can be set from the keypad ST1/ST3 =Temperature of inlet water or intake air. SET-POINT = Heating set-point set from keypad. C04 = Heating thermostat hysteresis C05 = Step intervention differential Capacity Set-Point 2nd Step 1st Step Pa C04 Pa C04 Temperature ST1/ST3 Pa C05 If H05 = 2 or 3 the compressor is switched off and on according to the status of input ST1. If a digital input is configured as a request for second step (H18 or H19 or H20 or H21 = 6), the corresponding call depends on this input. This function is active only if H05 = 2 or 3 Release Jan. 2001 Energy Light 23/67

15.0 SET POINT COMPENSATION The regulator allows the set-point to be modified by adding a proportional value to the 4-20 ma analogue input or external temperature probe function. The aim of this is to save energy. The control is active if The activation parameter = 1 (H31 Enable dynamic Set-point ) Probe ST3 is configured as a dynamic Set-point 4-20mA input (H07 = 3) or probe ST4 is configured as an external probe (H08 = 3) Regulator parameters H32= max offset in Cooling H33= max offset in Heating H34= External temperature set in Cooling H35= External temperature set in Heating H36= Cooling temperature differential H37= Heating temperature differential Set-point offset in Cooling/Heating, current input Set-point shifting with current input Offset(H32 o H33) >0 Set-point shifting with current input Offset(H32 o H33) <0 Set-Point Offset >0 Set-Point Unit Set- Point 4 ma 20 ma Current Unit Set- Point 4 ma 20 ma Current Offset <0 Set-point offset in Cooling/Heating, external temperature input Set-point shifting following the outdoor temperature Offset(H32 o H33) >0 Set-point shifting following the outdoor temperature Offset(H32 o H33) <0 Set-Point Outdoor temp. set-point (H34 o H35) Set-Point Offset >0 Outdoor temp. set-point (H34 o H35) Unit Set- Point Delta <0 H36 o H37 Delta >0 H36 o H37 Outdoor temperature BT4 Unit setpoint Delta <0 H36 o H37 Delta >0 H36 o H37 Outdoor temp. BT4 Offset <0 Release Jan. 2001 Energy Light 24/67

16.0 CONDENSATION FAN This refers to the ventilation unit located outside on the heat exchanger which normally acts as a condenser. In the event of heat pump operation, this exchanger naturally acts an evaporator. The ventilation unit allows the following values to be set: minimum speed, maximum speed and silent speed (corresponding to low noise operation, for example, during the night), as well as a proportional band within these values. The fan is off if: an external fan blocking alarm is present (TAB. 7.0) in stand-by or off 16.1 FAN CONFIGURATION Type of output The fan output can be configured to operate in proportional or ON OFF mode. F01 = Triac output mode selection; 0 = Proportional fan output 1 = ON-OFF fan output; in this phase the fan is off if the output of the proportional regulator is equal to 0, otherwise it is on at maximum speed (no capacity-control) if the output of the regulator is greater than 0. 2 = Control of the external antifreeze heating elements, for water/water machines with automatic reversal (internal) 3 = Fan control for ON-OFF operation on compressor call. In this mode the fan is switched off and on according to status of the compressor The fan can also be controlled by the output associated to the optional board: H25 = Optional output configuration: 0 = Open collector output for second compressor 1 = Fan speed output, 4-20mA 2 = Fan speed output, 0-10V REAR SIDE Conn. A Conn. B C5121234 4-20 ma GND 0-10 V 16.2 PROPORTIONAL FAN SPEED MANAGEMENT If the output is configured as TK proportional, the Peak, Phase displacement, Impulse duration parameters are significant. PEAK On each start-up of the external fan, the fan on the heat exchanger is powered at the maximum voltage, thus at maximum speed, for a period equal to F02 in seconds; once this period has elapsed, the fan continues at the speed set by the regulator. F02 = Fan peak time (seconds) PHASE DISPLACEMENT Defines a delay used to compensate for the different electrical specifications of the fan drive motors: F03 = duration, as a percentage, of the fan phase displacement. IMPULSE DURATION Defined the duration in microseconds*10 of the command impulse of the TK F04= triac command impulse duration Release Jan. 2001 Energy Light 25/67

16.3 CONDENSATION CONTROL IN COOLING The condensation control depends on the condensation temperature or pressure. The control is active if: at least one probe is configured as a condensation probe (pressure or temperature) otherwise the fan operates in ON OFF mode, called by the compressor. The fan can be controlled independently from the compressor or called by the compressor F05= fan output mode 0: if the compressor is off the fan is off 1: condensation control is independent from the compressor The cut-off is bypassed for a period equal to F12 from the start-up of the compressor. During this period, if the regulator requests cut-off, the fan operates at minimum speed. The condensation control depends on the condensation temperature or pressure F06 = Minimum fan speed in COOLING; F07 = Maximum silent fan speed in COOLING F08 = Set minimum fan speed temperature/pressure in COOLING F09 = Fan prop. band in COOLING F10 = Fan cut-off differential F11 = Cut-off hysteresis F13 = Maximum fan speed in COOLING F14 = Set maximum fan speed temperature/pressure in COOLING 16.4 PRE-VENTILATION The fan effects a pre-ventilation function if both the following conditions are true: Cooling mode F05 = 0 (operation called by compressor) Pre-ventilation is effected before the compressor starts, for a period equal to F25 (pre-ventilation time in Cooling). This function inhibits compressor start-ups with too high condensation pressures. Release Jan. 2001 Energy Light 26/67

16.5 CONDENSATION CONTROL IN HEATING The control is not active if: a defrost cycle is in progress at least one probe is configured as a condensation probe (pressure or temperature), otherwise the fan operates in ON OFF mode, called by the compressor. On the start-up of the compressor, if the proportional regulator requests the cut-off of the fan, this cut-off can be excluded for a period equal to F12 from the start-up of the compressor. During this period, if the regulator requests cut-off the fan operates at minimum speed. The fan can be controlled independently from the compressor or called by the compressor. F05 = Fan output mode F15 = Minimum fan speed in HEATING; F16 = Maximum silent fan speed in HEATING F17 = Set minimum fan speed temperature/pressure in HEATING F18 = Fan prop. band in HEATING F10 = Fan cut-off differential F11 = Cut-off hysteresis. F19 = Maximum fan speed in HEATING F20 = Set maximum fan speed temperature/pressure in HEATING Release Jan. 2001 Energy Light 27/67

17.0 FAN SPEED MANAGEMENT BOARDS The phase-cutting boards, codes C5111026 and C5111027, allow the control of the condensation fan speed for motors with consumption greater than 2A. 17.1 3.1A FAN MODULE (CODE C5111026) L 8 8 8 N N N N TK TK AN1 FUSE The modules gets the signal from the control module and transform it into a power signal to drive the fans. This is used for fans with overall consumption of up to 3.1A. C5111026 N 31 N 31 31 31 32 32 33 33 34 35 35 36 17.2 10.1A FAN MODULE (CODE C5111027) L 8 8 8 N N N N TK TK AN1 FUSE The modules acquire the signal from the control module and transform it into a power signal to drive the fans. This is used for fans with overall consumption of up to 10.1A. C5111027 N 31 N 31 31 31 32 32 33 33 34 35 35 36 Release Jan. 2001 Energy Light 28/67

17.3 CONNECTION TO THE ENERGY LIGHT ELECTRONIC CONTROL CONNECTOR A 12 AC ALL GND GND ST4 ST3 ST2 ST1 12 AC 12 DC TK ID5 ID4 ID3 ID2 ID1 220 Vac L 8 8 8 N N N N TK TK AN1 FUSE C5111026 N N 31 31 31 31 32 32 33 33 34 35 35 36 E1 M1 Release Jan. 2001 Energy Light 29/67

18.0 CALIBRATING THE CONDENSATION FANS 1. After having configured the unit for operation with proportional fan output, set the fan parameters with the values indicated as follows, so that the fan rotation speed is equal to 50% of the maximum voltage, (the operating temperature during calibration must be greater than 2 C): F06 = 50 F07 = 50 F08 = 0 F13 = 50 F14 = 10 2. Place a voltmeter set for 230VAC between terminals L1 and N, so as to determine the value of the line voltage, Vac 3. Move the voltmeter, still set for 230VAC, between terminals L1 and OUT-TC, so as to determine the voltage of the fan, Vv 4. At this stage, to determine the correct value of the fan phase displacement, change the setting of parameter F3 until the voltmeter shows a value equal to half the line voltage (Vv = ½Vac). This determines the value to be assigned to parameter F3 5. Now return all other fan parameters to the Clivet default values and check that the speed modulation is linear in relation to the variation in temperature read by probe ST3 CR1-R1 CR3-R3 NC IN-TC CONNECTOR B R1 R2 R3 R4 OUT-TC FAN MOTOR L1 220 Vac N Release Jan. 2001 Energy Light 30/67

19.0 REVERSING VALVE The reversing valve regards heat pump operation. It is active only if: relay 3 configuration parameter H23= 0. the heat pump is enabled (H28= 1). The reversing valve is off when the instrument is OFF or in stand-by. The polarity can be configured by parameter: H38= Reversing valve polarity 0=relay on in Cooling 1=relay on in Heating 19.1 REVERSING VALVE IN COOLING Always active. 19.2 REVERSING VALVE IN HEATING Not active, unless defrosting is active (see relative paragraph) 19.3 NOTES ON THE MANAGEMENT OF THE 4 WAY VALVE The units manufactured by Clivet are configured with the following operating logic: The reversing valve is ON in COOLING and OFF in HEATING During machine operation, the 4 way valve remains in its existing position, even when the unit is in one of the following conditions: OFF / REMOTE OFF / STAND-BY To switch from Cooling to Stand-by without the 4-way valve changing status, press the Mode button twice consecutively within 2 seconds Once the operating mode has been changed, wait 2 seconds for the reversing valve to change status In the case of blackouts, when power returns to the module, the operating mode prior to the blackout, as saved by the module, is automatically restarted. 20.0 REMOTE HEATING/COOLING SELECTION 1. If the Heat/Cool selection is to be remote controlled together with the ON/OFF control, analogue input ST4 must be used as a digital input. The following parameters must also be set correctly: H08 = 2 Configuration analogue input ST4 H21 = 3 Configuration input ST4 (if digital) H27 = 1 Operating mode selection 2. If the Heat/Cool selection is to be remote controlled without remote controlling the ON/OFF function, simply modify the following parameters: H20 = 3 Configuration ID5 H27 = 1 Operating mode selection With the parameters configured as in points 1 and 2, the operating mode selection is linked to an external contact and is disabled on the keypad. Contact closed = Cooling Contact open = Heating Release Jan. 2001 Energy Light 31/67

21.0 WATER PUMP The water pump is active only if the relay 2 configuration parameter is 0 (H22 = 0 pump). The pump is off if an alarm blocking the pump is present (for example, the flow-switch alarm with manual reset A06=0) or the regulator is OFF The pump can be configured to operate independently from the compressor, or on call. P01: Pump operating mode 0 = continuous operation 1 = operation called by the thermoregulator 2 = cyclical operation 3= continuous operation in Cooling, on call in Heating (If Pa H22=1) 4= continuous operation in Heating, on call in Cooling (If Pa H22=1) NOTE: with the flow-switch alarm active in automatic reset the pump is still on even if the compressor is OFF due to the alarm 21.1 WATER PUMP WITH ON-CALL OPERATION The pump is switched on upon request of the thermoregulator The compressor is activated with a delay (P02) from the start-up of the pump The pump is switched off with a delay (P03) from the OFF status of the thermoregulator In defrosting mode, when the compressor is OFF the pump remains on Thermoregulator ON OFF Time Compressor ON OFF Time Pump ON OFF Time Delay time between pump and compressor ON Delay time between pump and compressor OFF Release Jan. 2001 Energy Light 32/67

21.2 WATER PUMP WITH CONTINUOUS OPERATION The pump is always activated when the regulator is ON The compressor is enabled to start with a delay (P02) from the start-up of the pump The pump is disabled when the thermoregulator is off (from the keypad or remote switch), and the delay set by the parameter (P03) has elapsed from the OFF status of the compressor. 21.3 WATER PUMP IN CYCLICAL OPERATION The pump is activated and deactivated independently from the thermoregulator. This operation occurs at constant intervals, described as follows: The pump stays on for a period equal to P02 (seconds*10) After this it is switched off and remains OFF for a period equal to P03 (seconds*10) Release Jan. 2001 Energy Light 33/67

22.0 CONFIGURING THE INTERNAL ANTIFREEZE HEATING ELEMENTS / INTEGRATION The antifreeze heating element output is active only if relay 4 configuration parameter is 0 (H24 = 0 antifreeze heater/integration) Table of heater configuration Heater configuration parameters Value 0 Value 1 Configuration in defrost function r01 On only upon request from regulator Always on in defrosting Configuration in cooling mode r02 Off in Cooling On in Cooling (according to the antifreeze heater regulator) Configuration in heating mode r03 Off in Heating On in Heating (according to the antifreeze heater regulator) Configuration heater regulation probe in Heating r04 Configuration regulation probe in Cooling r05 Regulation on ST1 if H05 (configuration ST1) = 1 otherwise off Regulation on ST1 if H05 (configuration ST1) = 1 otherwise off Regulation on ST2 if H06 (configuration ST2) = 1 otherwise off Regulation on ST2 if H06 (configuration ST2) = 1 otherwise off Configuration in OFF or STAND-BY r06 Off in OFF and STAND-BY Heater on in OFF and STAND-BY The heating element regulator operates with 2 separate set-points, one for heating mode and one for cooling mode: r07: antifreeze heating element set-point in Heating r08: antifreeze heating element set-point in Cooling The differential for the deactivation of the antifreeze heating elements is determined by the parameter: r11: antifreeze heater hysteresis (in Heating and Cooling) In OFF and STAND-BY the control uses the heating set using the same regulation probe The two antifreeze heating element set-points are in the range between a maximum and minimum value, respectively r09: maximum antifreeze heating element set-point r10: minimum antifreeze heating element set-point Release Jan. 2001 Energy Light 34/67

22.1 EXTERNAL ANTIFREEZE HEATING ELEMENTS The external antifreeze heating elements are used in water/water machines with automatic reversal (internal). The external antifreeze heating element output is active only if probe ST3 is configured as an NTC antifreeze input for water/water machines with automatic reversal (internal) (H07= 4) output TK is configured as antifreeze heating element output for water/water machines with automatic reversal (F01 = 2) Regulation is effected on probe ST3 with a set-point set by parameter r12 and an hysteresis r11. The control is analogous to that of the internal heating elements 22.2 BOILER DEPENDENT ON EXTERNAL TEMPERATURE The boiler output has 2 different operating modes, integration or heating with boiler only. The boiler is off: in Cooling, Stand-by or OFF when alarms blocking the boiler are present (TAB 7.0) 22.3 BOILER IN INTEG RATION MODE The output is active if: relay 4 configuration parameter is 2 (H24 = 2 Boiler) the heat pump is configured as present (H28=1) ST4 is configured as an external probe (H08 = 3) The boiler is activated in Heating mode if the external temperature falls below the value of r13. In this case, the compressor and the fan remain off and the heating occurs using the boiler only. The heat pump is reactivated if the external temperature exceeds the value r14+r13. If the boiler is active, thermoregulation is effected using the boiler output; Regulation is analogous to that of the compressor in Heating. 22.4 BOILER IN HEATING MODE The output is active if relay 4 configuration parameter is 2 (H24 = 2 Boiler) the heat pump is configured as not present (H28=0) Thermoregulation in Heating mode is effected using the boiler output; regulation is analogous to that of the compressor in Heating. The compressor and external fan are off. Release Jan. 2001 Energy Light 35/67

22.5 SUPPORT HEATING ELEMENT ACTIVATION The same output used to control the antifreeze heating elements is used to control the support heating elements in Heating, when the enabling parameter r15 = 1 (enable support heating elements in Heating). The output is always active when Heating mode is selected, and is deactivated when the temperature read by probe ST1 is equal to Heating Set-point r14 (Ext. temperature delta for boiler deactivation). The output is reactivated when the value read by probe ST1 falls below the Heating Set by a temperature value equal to Heating Set-point (r14 C04) Support el. heaters output Set-Point Heating ON OFF Pa C04 Pa r14 Temperature ST1 The support heating element output is not active when the following conditions are true: r15 = 0 Unit in OFF or Stand-by Unit in Remote OFF Cooling operation Unit in alarm E00, E45, E06, E42, E07, E40 (see Tab. 7.0) NOTE: The output corresponding to the control of the antifreeze heating elements is always active with the same mode of intervention, according to the antifreeze Set-point (r07) and the temperature read by probe ST2. Release Jan. 2001 Energy Light 36/67