9.12 Solar DHW heating and central heating backup
Solar control module, type SM1
Part no. Z014470
Function extension inside wall mounting enclosure
Electronic temperature differential control for dual mode DHW heat-
ing and central heating backup using solar collectors
Specification
Functions
■ Output statement and diagnostic system
■ Operation and display via the Vitotronic control unit.
■ Switching the solar circuit pump
■ Heating of 2 consumers via a collector array
■ 2nd temperature differential control
■ Thermostat function for reheating or utilising excess heat
■ Speed control for solar circuit pump via PWM input (make: Grund-
fos and Wilo)
■ Suppression of DHW cylinder reheating by the heat generator sub-
ject to solar yield
■ Heat-up of the solar preheating stage (with 400 l DHW cylinders or
larger)
■ Collector safety shutdown
■ Electronic temperature limitation in the DHW cylinder
■ Switching of an additional pump or valve via relay
To implement the following functions, also order immersion tempera-
ture sensor, part no. 7438702:
■ For DHW circulation diversion in systems with 2 DHW cylinders
■ For return changeover between the heat generator and the heating
water buffer cylinder
■ For return changeover between the heat generator and the pri-
mary heat store
■ For heating additional consumers
Structure
The solar control module contains:
■ PCB
■ Terminals:
– 4 sensors
– Solar circuit pump
– KM BUS
– Power supply (on-site ON/OFF switch)
■ PWM output for switching the solar circuit pump
■ 1 relay for switching one pump or one valve
Collector temperature sensor
For connection inside the appliance
On-site extension of the connecting lead:
■
2-core lead, length up to 60 m with a cross-section of 1.5 mm
2
(copper)
■ Never route this lead immediately next to 230/400 V cables.
Collector temperature sensor specification
Lead length 2.5 m
IP rating IP 32 to EN 60529; ensure through de-
sign/installation.
Sensor type Viessmann NTC 20 kΩ at 25 °C
Permissible ambient temperature
– Operation −20 to +200 °C
– Storage and transport −20 to +70 °C
Cylinder temperature sensor
For connection inside the appliance
On-site extension of the connecting lead:
■
2-core lead, length up to 60 m with a cross-section of 1.5 mm
2
(copper)
■ Never route this cable immediately next to 230/400 V cables.
Cylinder temperature sensor specification
Lead length 3.75 m
IP rating IP 32 to EN 60529; ensure through de-
sign/installation.
Sensor type Viessmann NTC 10 kΩ at 25 °C
Permissible ambient temperature
– Operation 0 to +90 °C
– Storage and transport −20 to +70 °C
For systems with Viessmann DHW cylinders, the cylinder tempera-
ture sensor is installed in the threaded elbow in the heating water
return (standard delivery or accessory for the relevant DHW cylin-
der).
Solar control module specification
Rated voltage 230 V~
Rated frequency 50 Hz
Rated current 2 A
Power consumption 1.5 W
Protection class I
IP rating IP 20 to EN 60529; ensure through de-
sign/installation.
Function type Type 1B to EN 60730-1
Permissible ambient temperature
– Operation 0 to +40 °C, use in the living space or
boiler room (standard ambient condi-
tions)
– Storage and transport −20 to +65 °C
Rated relay output breaking capacity
– Semi-conductor relay 1 1 (1) A, 230 V~
– Relay 2 1 (1) A, 230 V~
– Total Max. 2 A
Control unit accessories
(cont.)
VITOCAL
VIESMANN
145
5831388
9
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