Installation and Service Instructions for use by heating contractor Solar Control Module for solar connections to the Vitotronic control SM1 SOLAR CONTROL MODULE Product may not be exactly as shown IMPORTANT Certified as a component part for Viessmann boilers 09/2013 Read and save these instructions for future reference. Please file in Service Binder
Safety Safety, Installation and Warranty Requirements Solar Control Module SM1, Installation and Service Please ensure that these instructions are read and understood before commencing installation. Failure to comply with the instructions listed below and details printed in this manual can cause product/property damage, severe personal injury, and/or loss of life. Ensure all requirements below are understood and fulfilled (including detailed information found in manual subsections). Product documentation Read all applicable documentation before commencing installation. Store documentation near boiler in a readily accessible location for reference in the future by service personnel. For a listing of applicable literature, please see section entitled Important Regulatory and Safety Requirements. Warranty Information contained in this and related product documentation must be read and followed. Failure to do so renders the warranty null and void. Licensed professional heating contractor The installation, adjustment, service and maintenance of this equipment must be performed by a licensed professional heating contractor. Please see section entitled Safety and Important Regulatory and Installation Requirements. Advice to owner Once the installation work is complete, the heating contractor must familiarize the system operator/ ultimate owner with all equipment, as well as safety precautions/requirements, shutdown procedure, and the need for professional service annually before the heating season begins. 2
Solar Control Module SM1, Installation and Service Table of Contents Page Safety Important Precautions General Information Installation Connections Safety, Installation and Warranty Requirements...2 Product documentation...2 Licensed professional heating contractor...2 Advice to owner...2 Warranty...2 Important Regulatory and Installation Requirements...4 Approvals...4 Codes...4 Working on the equipment...4 Power supply...4 About these Installation Instructions...5 Mounting on the Wall...6 Overview of Electrical Connections...7.System Example 1...8.System Example 2...11.System Example 3...14 Power Supply...18 Connecting the KM Bus to the Extension Modules...19 Connection and Wiring Diagram...20 Additional Information Function Description...21 Specifications...23 3
Important Precautions Important Regulatory and Installation Requirements Solar Control Module SM1, Installation and Service Approvals Viessmann boilers, burners and controls are approved for sale in North America by CSA International. Codes The installation of this unit shall be in accordance with local codes. In the absence of local codes, use: - CSA C22.1 Part 1 and/or local codes in Canada - National Electrical Code ANSI/NFPA 70 in the U.S. Always use latest editions of codes. The heating contractor must comply with the Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME CSD-1 where required by the authority having jurisdiction. Working on the equipment The installation, adjustment, service, and maintenance of this product must be done by a licensed professional heating contractor who is qualified and experienced in the installation, service, and maintenance of hot water boilers. There are no user serviceable parts on the boiler, burner, or control. Power supply Install power supply in accordance with the regulations of the authorities having jurisdiction or, in absence of such requirements, in accordance with National Codes. Viessmann recommends the installation of a disconnect switch to the 120V power supply outside of the boiler room. Ensure main power supply to equipment, the heating system, and all external controls have been deactivated. Close main oil or gas supply valve. Take precautions in both instances to avoid accidental activation of power during service work. Please carefully read this manual prior to attempting installation. Any warranty is null and void if these instructions are not followed. For information regarding other Viessmann System Technology componentry, please reference documentation of the respective product. We offer frequent installation and service seminars to familiarize our partners with our products. Please inquire. The completeness and functionality of field supplied electrical controls and components must be verified by the heating contractor. These include low water cut-offs, flow switches (if used), staging controls, pumps, motorized valves, air vents, thermostats, etc. WARNING Turn off electric power supply before servicing. Contact with live electric components can cause shock or loss of life. 4
Solar Control Module SM1, Installation and Service About these Installation Instructions General Information Take note of all symbols and notations intended to draw attention to potential hazards or important product information. WARNING Warnings draw your attention to the presence of potential hazards or important product information. Indicates an imminently hazardous situation which, if not avoided, could result in death, serious injury or substantial product/property damage. CAUTION Cautions draw your attention to the presence of potential hazards or important product information. Indicates an imminently hazardous situation which, if not avoided, may result in minor injury or product / property damage. IMPORTANT Helpful hints for installation, operation or maintenance which pertain to the product. This symbol indicates to note additional information This symbol indicates that other instructions must be referenced. 5
Installation Mounting on the Wall Solar Control Module SM1, Installation and Service Extension kit for installation on a wall 1. Loosen the retaining screws from the extension kit enclosure (do not remove). 2. Remove cover and set aside. 3. Mount the extension module enclosure to the wall using the supplied hardware. 4. Install the cover. Components: H SM1 module H KM BUS plug avg H Power cord pre-wired to plug fö H Temperature sensor % H Temperature sensor & H Temperature sensor / (accessory) H Temperature sensor aö (accessory) H Pump plug ss H Pump plug sf H Speed control PWM plug 6
Solar Control Module SM1, Installation and Service Overview of Electrical Connections Connections A Legend A Solar control module % DHW tank temperature sensor & Collector temperature sensor / Temperature sensor (accessory) aö Temperature sensor (accessory) ss Transfer pump or 3-way diverter valve sf Solar circuit pump fö Power supply avg KM BUS to boiler control unit PWM Speed control, solar circuit pump (if circulation pump with PWM control installed) CAUTION Electronic modules can be damaged by electrostatic charges. Before commencing work, touch an grounded object, e.g. heating or water pipes to discharge static loads. Note: Apply a strain relief to all on-site cables. Close any unnecessary knock-outs with cable grommets (not cut open). 7
Connections System Example 1 Solar Control Module SM1, Installation and Service DHW heating with dual mode DHW tank Function description DHW heating with solar energy If the temperature differential between collector temperature sensor eq and DHW tank temperature sensor qq is greater than the start temperature differential (coding address 00), solar circuit pump ee is started and DHW tank qp is heated. Solar circuit pump ee stops if: H Actual temperature drops below stop temperature differential (coding address 01) H Maximum DHW tank temperature is exceeded (coding address 08) H The temperature selected at high limit safety cut-out qw (if installed) is reached Additional function for DHW heating The requirements for the additional function are achieved through circulation pump qt. Suppression of DHW tank reheating by the boiler Reheating suppression takes place in two stages. Required codes at the oil/gas boiler control unit Boiler installation and service instructions Reheating of DHW tank qp by boiler 1 is suppressed as soon as DHW tank qp is heated by collectors ep. For this, the set DHW tank temperature for reheating is reduced by boiler 1. After solar circuit pump ee has been switched off, suppression remains active for a certain time. In the case of uninterrupted heating by the collectors ep (> 2 h), boiler 1 will only reheat if the set DHW temperature selected at boiler control unit 2 (coding address 67 ) is not achieved. A third set DHW temperature can be specified via coding address 67 [setting range 50 to 203 F (10 to 95 C)]. This value must be below the first set DHW temperature. DHW tank qp will only be heated by boiler 1 if this set value cannot be achieved by the solar thermal system. DHW heating without solar energy The upper section of DHW tank qp is heated by boiler 1. The DHW tank thermostat with DHW tank temperature sensor qz of boiler control unit 2 regulates DHW tank heating. Function/system components Start temperature differential for solar circuit pump at connection sf Factory set condition 8 K (14.4 F) Stop temperature differential for solar circuit pump at connection sf Factory set condition 4 K (7.2 F) Solar circuit pump type: H Solar circuit pump is not speed-controlled H Solar circuit pump is speed-controlled with wave pack control H Solar circuit pump is speed-controlled with PWM control Note: Coding address 00 can be set to min. 0.9 F (0.5 K) above coding address 01. Coding address 01 can be set to max. 0.9 F (0.5 K) below coding address 00. Adjust Code in solar group Factory set condition 00:... 00:8 01:... 01:4 -- 02:1 02:2 02:0 02:0 02:0 Maximum DHW tank temperature (Factory set condition 140 F) 60 C) 08:... 08:60 Additional DHW heating function: H Without additional function for DHW heating H With additional function for DHW heating -- 20:1 20:0 20:0 8
Solar Control Module SM1, Installation and Service System Example 1 (continued) Connections Hydraulic installation scheme Equipment required Legend 1 Wall mounted oil/gas boiler with 2 Boiler and heating circuit control unit qp Dual mode DHW tank qq DHW tank temperature sensor % (solar control module) qw High limit safety cut-out (accessory) qe DHW circulation pump (on site) (accessories may be required for connection) qr Thermostatic mixing valve (accessory) qt Circulation pump ss (transfer of heat, on site) qz DHW tank temperature sensor % (boiler) ep Solar collectors eq Collector temperature sensor & ew Solar-Divicon (accessory) with ee Solar circuit pump sf ez Solar control module, type SM1 eu Junction box (on site) 9
Connections System Example 1 (continued) Solar Control Module SM1, Installation and Service Electrical installation scheme Solar control module, type SM1 10
Solar Control Module SM1, Installation and Service System Example 2 DHW heating with two mono mode DHW tanks Function description DHW heating with solar energy If the temperature differential between collector temperature sensor eq and DHW tank temperature sensor qq is greater than the start temperature differential (coding address 00), solar circuit pump ee starts and DHW tank 1 qp is heated. Solar circuit pump ee stops if: H Actual temperature drops below stop temperature differential (coding address 01) H Maximum DHW tank temperature is exceeded (coding address 08) H The temperature selected at high limit safety cut-out qw (if installed) is reached Transfer pump qt starts if the temperature at temperature sensor qz has reached the start temperature differential of the differential temperature control 2 (code 22). The water heated in DHW tank 1 qp is supplied to DHW tank 2 qi. This means DHW tank 2 qi is also heated by solar energy. Transfer pump qt stops if the temperature at temperature sensor qz has fallen below the stop temperature differential of the differential temperature control 2 (code 23). Connections Additional function for DHW heating The requirements for the additional function are achieved through circulation pump qt. Suppression of DHW tank 2 heating by the boiler with DHW heating Reheating suppression takes place in two stages. Heating DHW tank 2 qi by boiler 1 is suppressed as soon as DHW tank 1 qp is heated by collectors ep. For this, the set DHW tank temperature for reheating is reduced by boiler 1. After solar circuit pump ee has been switched off, suppression remains active for a certain time. In the case of uninterrupted heating by the collectors ep (> 2 h), boiler 1 will only heat if the set DHW temperature selected at boiler control unit 2 (coding address 67 ) is not achieved. A third set DHW temperature can be specified via coding address 67 [setting range 50 to 203 F (10 to 95 C)]. This value must be below the first set DHW temperature. DHW tank 2 qi will only be heated by boiler 1, if this set value is not achieved by the solar thermal system. DHW heating without solar energy DHW tank 2 qi is heated by boiler 1. The DHW tank thermostat with DHW tank temperature sensor qo of boiler control unit 2 starts the internal circulation pump and changes the 3-way diverter valve to DHW heating. Required codes at the oil/gas boiler control unit Boiler installation and service instructions Code in solar group Function/system components Adjust Factory set condition Start temperature differential for solar circuit pump at 00:... 00:8 connection sf. Factory set condition 8 K (14.4 F) Stop temperature differential for solar circuit pump at 01:... 01:4 connection sf. Factory set condition 4 K (7.2 F) Solar circuit pump type: H Solar circuit pump is not speed-controlled H Solar circuit pump is speed-controlled with wave pack control H Solar circuit pump is speed-controlled with PWM control -- 02:1 02:2 02:0 02:0 02:0 Maximum DHW tank temperature (Factory set condition 60 C) 08:... 08:60 Start temperature differential with central heating 22:... 22:8 backup. Factory set condition 8 K (14.4 F) Stop temperature differential with central heating backup. Factory set condition 4 K (7.2 F) 23:... 23:4 Note: Coding address 00 can be set to min. 0.9 F (0.5 K) above coding address 01. Coding address 01 can be set to max. 0.9 F (0.5 K) below coding address 00. 11
Connections System Example 2 (continued) Solar Control Module SM1, Installation and Service Hydraulic installation scheme Equipment required Legend 1 Wall mounted oil/gas boiler with 2 Boiler and heating circuit control unit qp DHW tank 1, mono mode qq DHW tank temperature sensor % (solar control module) qw High limit safety cut-out (accessory) qe DHW circulation pump (on site) (accessories may be required for connection) qr Thermostatic mixing valve (accessory) qt Transfer pump (on site) qz Temperature sensor / (accessory) qu Temperature sensor aö (accessory) qi DHW tank 2, mono mode qo DHW tank temperature sensor % (boiler) ep Solar collectors eq Collector temperature sensor & ew Solar-Divicon (accessory) ee Solar circuit pump sf (standard delivery, Solar-Divicon) ez Solar control module, type SM1 eu Junction box 12
Solar Control Module SM1, Installation and Service System Example 2 (continued) Connections Electrical installation scheme Solar control module, type SM1 A KM BUS to boiler control unit 13
Connections System Example 3 Solar Control Module SM1, Installation and Service DHW heating with mono mode DHW tank and central heating backup with multi mode heating water buffer DHW tank with differential temperature control Function description DHW heating with solar energy If the temperature differential between collector temperature sensor eq and DHW tank temperature sensor rq is greater than the start temperature differential (coding address 00), solar circuit pump ee starts and heating water buffer DHW tank rp is heated. Solar circuit pump ee stops if: H Actual temperature drops below stop temperature differential (coding address 01) H Maximum DHW tank temperature is exceeded (coding address 08) H The temperature selected at high limit safety cut-out rr (if installed) is reached Entire heating water buffer DHW tank rp is heated by the solar thermal system if the insolation is adequate. If there is insufficient solar energy, the DHW is preheated by the solar energy available in heating water buffer DHW tank rp, and is brought up to the required temperature in DHW tank qp via boiler 1. The burner and circulation pump for DHW tank heating 7 are started via DHW tank temperature sensor qq of the boiler control unit. Suppression of heating water buffer DHW tank reheating by the boiler with DHW heating Reheating suppression takes place in two stages. Heating of DHW tank qp by boiler 1 is suppressed as soon as heating water buffer DHW tank rp is heated by collectors ep. For this, the set DHW tank temperature for reheating is reduced by boiler 1. After solar circuit pump ee has been switched off, suppression remains active for a certain time. In the case of uninterrupted heating by the collectors ep (> 2 h), boiler 1 will only reheat if the set DHW temperature selected at boiler control unit 2 (coding address 67 ) is not achieved. A third set DHW temperature can be specified via coding address 67 [setting range 50 to 203 F (10 to 95 C)]. This value must be below the first set DHW temperature. DHW tank qp will only be heated by boiler 1 if this set value cannot be achieved by the solar thermal system. DHW heating without solar energy DHW tank qp is heated by boiler 1. The DHW tank thermostat with DHW tank temperature sensor qq of boiler control unit 2 controls circulation pump for DHW tank heating 7. 14
Solar Control Module SM1, Installation and Service System Example 3 (continued) Connections Central heating with solar energy If the temperature differential between sensor rw and sensor rt is greater than the temperature differential of coding address 22, 3-way diverter valve rz is switched to direction AB-A. The heating circuit return water is routed through heating water buffer DHW tank rp and heated by solar energy. Suppression of reheating by the boiler in the case of central heating backup with solar energy If a sufficiently high temperature is available in heating water buffer DHW tank rp to heat the heating circuits, reheating by boiler 1 can be suppressed. Central heating without solar energy If the temperature differential between sensor rw and sensor rt is less than the temperature differential of coding address 23, 3-way diverter valve rz is switched to direction AB-B. The heating circuit return water is routed directly into low loss header tp and only heated by the boiler. Required codes at the oil/gas boiler control unit Boiler installation and service instructions Function/system components Start temperature differential for solar circuit pump at connection sf Factory set condition 8 K (14.4 F) Stop temperature differential for solar circuit pump at connection sf Factory set condition 4 K (7.2 F) Solar circuit pump type: H Solar circuit pump is not speed-controlled H Solar circuit pump is speed-controlled with wave pack control H Solar circuit pump is speed-controlled with PWM control Adjust Code in solar group Factory set condition 00:... 00:8 01:... 01:4 -- 02:1 02:0 02:0 02:0 02:0 Maximum DHW tank temperature (Factory set condition 60 C) 08:... 08:60 Differential temperature control 2 with central heating backup 20:4 20:0 Start temperature differential with central heating backup 22:... 22:8 Factory set condition 8 K (14.4 F) Stop temperature differential with central heating backup Factory set condition 4 K (7.2 F) 23:... 23:4 Note: Coding address 00 can be set to min. 0.9 F (0.5 K) above coding address 01. Coding address 01 can be set to max. 0.9 F (0.5 K) below coding address 00. 15
Connections System Example 3 (continued) Solar Control Module SM1, Installation and Service Hydraulic installation scheme Equipment required Legend 1 Wall mounted oil/gas boiler with 2 Boiler and heating circuit control unit 7 Circulation pump for DHW tank heating (on site) (accessories may be required for connection) qp Mono mode DHW tank qq DHW tank temperature sensor % (boiler) qe DHW circulation pump (on site) (accessories may be required for connection) qr Thermostatic mixing valve (accessory) ep Solar collectors eq Collector temperature sensor & ew Solar-Divicon (accessory) ee Solar circuit pump sf (standard delivery, Solar-Divicon) ez Solar control module, type SM1 eu Junction box (on site) rp Heating water buffer DHW tank rq DHW tank temperature sensor % (solar control module) rw Temperature sensor / (flow temperature sensor in heating water buffer DHW tank, accessory) rr High limit safety cut-out (accessory) rt Temperature sensor aö (return temperature sensor in heating circuit, accessory) rz 3-way diverter valve ss (accessory) tp Low loss header (accessory) tq Flow temperature sensor, low loss header? (accessory) 16
Solar Control Module SM1, Installation and Service System Example 3 (continued) Connections Electrical installation scheme Solar control module, type SM1 A KM BUS to boiler control unit 17
Connections Power Supply Solar Control Module SM1, Installation and Service Connect accessories with a total wattage above 400 W directly to the mains power supply. WARNING Incorrectly executed electrical installations can result in injuries from electrical current and in equipment damage. Connect the power supply and implement all grounding measures (e.g. RCD circuit) in accordance with the following regulations: H In Canada all electrical wiring is to be done in accordance with the latest edition of CSA C22.1 Part 1 and/or local codes. In the U.S. use the National Electrical Code ANSI/NFPA 70. The heating contractor must also comply with both the Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME CSD-1, and the Installation Code for Hydronic Heating Systems, CSA B214-01, where required by the authority having jurisdiction. H Connection requirements specified by your local power supply utility H Protect the power cable with max. 15A WARNING The absence of component grounding in the system can lead to serious injury from electrical current if an electrical fault occurs. The equipment and the pipework must be connected to the ground bonding of the house in question. Isolators for non-grounded conductors H The main isolator (if installed) must simultaneously isolate all non-grounded conductors from the mains with a minimum contact separation of 3 mm. We additionally recommend installing an AC/DCsensitive (RCD class B ) for DC (fault) currents that can occur with energy efficient equipment. H If no main isolator is installed, all nongrounded cables must be isolated from the mains by the upstream breaker with at least 3 mm contact separation. WARNING Incorrect core termination can cause severe injuries and damage to the equipment. Never interchange cores L1 and N. 18 Legend A SM1 module CAUTION An incorrect phase sequence can cause damage to the unit. Check for phase equality with the power supply connection of the control unit.
Solar Control Module SM1, Installation and Service Connecting the KM BUS to the Extension Modules Connections Legend A Boiler control unit B Extension kit for heating circuit with mixing valve M2 C Extension kit for heating circuit with mixing valve M3 D Extension AM1, EA1 and/or solar control module, type SM1 19
Connections Connection and Wiring Diagram Solar Control Module SM1, Installation and Service Legend A1 Main PCB PWM Speed control, solar circuit pump (if circulation pump with PWM control installed) TW Maximum temperature limiter X... Electrical interfaces % DHW tank temperature sensor & Collector temperature sensor / Temperature sensor (if installed) aö Temperature sensor (if installed) ss Transfer pump or 3-way diverter valve sf Solar circuit pump fö Power supply 120V/60Hz avg KM BUS to boiler control unit 20
Solar Control Module SM1, Installation and Service Function Description Additional Information Note: Set or alter the functions described below in coding levels 1 and 2 (solar group) at the boiler control unit. Refer to the boiler Service Instructions Reduction of stagnation time If there is excess solar energy, the speed of the solar circuit pump will be reduced before the maximum DHW tank temperature is reached. This increases the difference between collector temperature and DHW tank temperature. The heat transfer to the DHW tank is reduced, which delays stagnation. Coding address 0A. Maximum collector temperature If the maximum collector temperature is exceeded, the solar circuit pump is shut down to protect the system components (emergency collector shutdown). Coding address 09. Minimum collector temperature limit If the actual temperature falls below the minimum collector temperature, the solar circuit pump is shut down. Coding address 12. Interval function Activate the interval function in systems where the collector temperature sensor is not in an ideal location to prevent a time delay in capturing the collector temperature. Coding address 07. Thermostat function The thermostat function can be used independently of the solar operation. Different effects can be achieved by determining the thermostat start and stop temperatures: H Start temperature < stop temperature: e.g. reheating H Start temperature > stop temperature: e.g. utilisation of excess heat Coding addresses 20, 24, 25. Speed control The speed control is disabled in the Factory set condition. It can only be enabled for relay output sf. Possible pumps: H Standard solar pumps with and without their own speed control H High efficiency pumps H Pumps with PWM input (only use solar pumps) E.g. Grundfos Solar PM 15-85 Coding addresses 02 to 06. Note: We recommend operating the solar circuit pump at max. output while the solar thermal system is being vented. Heat statement When determining thermal yields, the difference between the collector and DHW tank temperature, the set throughput, the type of heat transfer medium and the operating time of the solar circuit pump are taken into account. Coding addresses 0E and 0F. Collector frost protection function Viessmann collectors are filled with Viessmann heat transfer medium. This function does not have to be enabled. Activate only when using water as heat transfer medium. With a collector temperature below 41 F (5 ºC), the solar circuit pump will be started to avoid damage to the collectors. The pump will be stopped when a temperature of 45 F (7 º C) has been reached. Coding address 0b. 21
Additional Information Function Description (continued) Solar Control Module SM1, Installation and Service Suppression of DHW tank reheating by the boiler Reheating suppression takes place in two stages. Reheating of the DHW tank by the boiler is suppressed as soon as the DHW tank is heated by the collectors. For this, the set DHW tank temperature for reheating is reduced by the boiler. After the solar circuit pump has been switched off, suppression remains active for a certain time. In the case of uninterrupted heating by the collectors (> 2 h), the boiler will only reheat if the set DHW tank temperature selected at the boiler control unit (coding address 67 ) is not achieved. A third set DHW temperature can be specified via coding address 67 [setting range 50 to 203 F (10 to 95 C)]. This value must be below the first set DHW temperature. The DHW tank will only be heated by the boiler, if this set value cannot be achieved by the solar thermal system. Suppression of reheating by the boiler in case of central heating backup If a sufficiently high temperature is available in the multi mode heating water buffer DHW tank to heat the heating circuits, reheating by boiler can be suppressed. Additional function for DHW heating With the additional function for DHW heating (boiler control unit function), the solar preheat stage can be heated up at the adjustable times. Boiler control unit settings: H Set DHW temperature 2 must be encoded. Coding address 58 (DHW group) H The fourth DHW phase for DHW heating must be enabled H Coding address 20 (solar group) This signal will be transmitted to the solar control module via the KM BUS, and the transfer pump will be started. External heat exchanger The DHW tank is heated via the heat exchanger. Secondary pump ss is started in parallel with solar circuit pump sf. If an additional temperature sensor / is used, secondary pump ss is switched on when solar circuit pump sf is running and the required temperature differential between % and / is available. Coding address 20. DHW tank priority control In systems with two consumers. It is possible to determine the order for heating the consumers. Coding addresses 10, 11, 26. Cyclical heating In systems with several consumers. If the consumer cannot be heated with priority, the next consumer in line will be heated for an adjustable cycle time. After this time has expired, the solar control unit checks the rise of the collector temperature during the adjustable cyclical pause. As soon as the start conditions for the consumer with priority have been met, that consumer will be heated again. Otherwise, the next-in-line consumers will continue to be heated. Coding addresses 26, 27, 28. Relay kick If the pumps and valves have been switched off for 24 h, they are started for approx. 10 sec. to prevent them seizing up. 22
Solar Control Module SM1, Installation and Service Specifications Additional Information Rated voltage 120 V~ Rated frequency 60 Hz Rated current 2 A Power consumption 1.5 W Protection class I IP rating IP 20 D to EN 60 529, ensure through design/ installation Permissible ambient temperature H During operation 32 to 104 F(0 to 40 C) H During storage and transport -4 to +149 F ( 20 to +65 C) Rated relay output breaking capacity H Solar circuit pump sf 1 A 120 V~ H Transfer pump ss 1 A 120 V~ Sensor curves Resistance in Temperature in Legend A Collector temperature sensor & B H DHW tank temperature sensor % H Temperature sensor / H Temperature sensor aö 23
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