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SATK series compact wall-mounted heat interface unit
INSTRUCTIONS FOR INST LL TION, COMMISSIONING ND M INTEN NCE
Product range
Direct wall-mounted HIU for LOW temperature
S TK20103HE
heating, instantaneous domestic hot water
production, power capacity 40 kW
Direct wall-mounted HIU for MEDIUM temperature
S TK20203HE
heating, instantaneous domestic hot water
production, power capacity 40 kW
Direct wall-mounted HIU for HIGH temperature
S TK20303
heating, instantaneous domestic hot water
production, power capacity 40 kW
Direct wall-mounted HIU for HIGH temperature
S TK20403HE
heating, instantaneous domestic hot water
production, power capacity 40 kW. With pump on the
primary side.
Direct wall-mounted HIU for HIGH temperature
S TK20305
heating, instantaneous domestic hot water
production, power capacity 65 kW
Function
The SATK series heat interface unit allows independent control of heat
regulation and domestic hot water production within centralised heating
systems.
ONTENTS
Safety instructions
Dimensions
Technical specifications
Installation
Commissioning
Electronic regulator
Safety and alarms
S TK20103HE
S TK20203HE
S TK20303/S TK20403HE
S TK20305
Maintenance
Electric connections
Troubleshooting
Commissioning checklist
1
78165.02 EN
www.c leffi.com
SATK20 series
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Summary of Contents for CALEFFI SATK20303
- Page 1 78165.02 EN www.c leffi.com SATK series compact wall-mounted heat interface unit SATK20 series INSTRUCTIONS FOR INST LL TION, COMMISSIONING ND M INTEN NCE Function The SATK series heat interface unit allows independent control of heat regulation and domestic hot water production within centralised heating systems.
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Page 2: S Fety Instructions
3 All hydraulic connections must be checked before pressurising the system. Vibration during transport may cause the connections to become loose. DO NOT APPLY EXCESSIVE TIGHTENING TORQUE otherwise the components may be damaged. For the updated version of the technical documentation refer to www.caleffi.com LE VE THIS M NU L S REFERENCE GUIDE FOR THE USER. - Page 3 Dimensions SATK20103/203/303/403 SATK20305 182,5 182,5 49 65 49 65 3/4” M 1/2” M 3/4” F S TK20103HE - S TK20203HE S TK20303 S TK20305 technical specifications S TK20403HE technical specifications Medium: water Medium: water Maximum percentage of glycol: Maximum percentage of glycol: Maximum medium temperature: 85°C Maximum medium temperature:...
- Page 4 Installation Connection to the chrono-thermostat The SATK series HIU is designed for installation in a sheltered The SATK series HIU is fitted for connection to a thermostat or domestic environment (or similar), therefore cannot be installed or chrono-thermostat, both standard and OpenTherm, for ambient used outdoors, i.e.
- Page 5 Heat meter installation The HIU is designed to fit a compact heat meter (with incorporated return probe) with 1” threaded connections and 130 mm gauge. Before carrying out any maintenance, repair or part replacement work, proceed as follows: - cut off the electric supply - remove the cover - close the shut-off valves - empty the HIU using the drain cocks provided...
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Page 6: Reset Key
All heating and domestic hot water functions offered by temperature regulation with compensated set SATK20 series HIUs are controlled by a digital controller. The controller is factory set with different parameters and settings point regulation is active, see page 9) depending on the model (Table 1). - Page 7 Safety and alarms Thermal safety valve fault S TK20103HE - LOW temperature Error codes associated with faults signalled by illumination of the Error code 76 FAULT LED are also shown on the display. Probe fault If a temperature probe fails, the associated cycle will be stopped immediately and disabled.
- Page 8 S TK20103H LOW temperature heat interface unit with high efficiency pump Characteristic components Frame Electronic regulator Thermal safety relief valve Heating mixing valve DHW production modulating valve Heating flow temperature probe Thermal safety thermostat DHW temperature probe DHW heat exchanger 10.
- Page 9 Operating cycles Domestic water cycle This cycle always takes priority over the heating cycle When DHW cycle activation is requested due to DHW tapping by the user detected by the domestic water flow meter, the regulator controls the opening of the modulating valve in order to adjust the temperature detected by the domestic water probe to the selected set point value.
- Page 10 S TK20303 HIGH temperature heat interface unit S TK20403H HIGH temperature heat interface unit with high efficiency pump on the primary side Characteristic components Frame Electronic regulator Heating ON/OFF valve DHW production modulating valve Drain cock DHW temperature probe DHW heat exchanger DHW priority flow meter Pump (SATK20403HE only) UPM3 15-70 with protective by-pass...
- Page 11 Operating cycles Domestic water cycle This cycle always takes priority over the heating cycle. When DHW cycle activation is requested due to DHW tapping by the user detected by the domestic water flow meter, the regulator controls the opening of the modulating valve in order to adjust the temperature detected by the domestic water probe to the selected set point value.
- Page 12 When carrying out maintenance on the electrical part, for the connections follow the diagram on page 13. After concluding maintenance, proceed with the filling and checking operations described in the chapter “Commissioning” and fit the cover. If you require any information regarding spare parts, please contact Caleffi spa.
- Page 13 Electric connections DHW temperature probe x x x x DHW priority flow meter x x x x Flow temp. compensation return probe DHW production valve actuator x x x x Thermal safety thermostat Thermal safety valve Heating flow temperature probe Heating valve actuator x x x x Earth...
- Page 14 Troubleshooting F ULT DESCRIPTION INDIC TIONS POSSIBLE C USE OF F ULT OPER TIONS TO BE PERFORMED primary circuit shut-off valves closed open the valves modulating valve actuator connector disconnected reconnect actuator connector modulating valve actuator disconnected from valve body reconnect actuator call qualified personnel to have it modulating valve actuator faulty...
- Page 15 F ULT DESCRIPTION INDIC TIONS POSSIBLE C USE OF F ULT OPER TIONS TO BE PERFORMED heating cycle temperature set point too low increase set point check programming of chrono- chrono-thermostat temperature setting incorrect thermostat call qualified personnel to have it HIU strainer clogged serviced call qualified personnel to have it...
- Page 16 Commissioning checklist Model Checks to be performed Is the heat interface unit properly secured to the wall? Has the system flushing been carried out? Check strainers and clean them if necessary Is the heat meter (if present) connected? Is the heat meter (if present) connected to the building datalogger (if required)? Is the DCW line fitted with a pressure reducing valve? Is the system protected by water hammer arresters? Has the domestic exchanger pre-heating function (normally off) been activated (if...
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