Solar System Design Guide
6020 457 - 01
18
Solar Control
Solar Control Module SM1
(continued)
Collector temperature sensor
For connection inside the module.
On-site extension of the connecting lead:
– 2-core copper lead, cable length up to 197 ft. (60 m)
AWG 15-16 [cross-section of 0.00233 in
2
(1.5 mm
2
)]
– Never route this lead immediately next to 120/240VAC
cables
– Solar control module, type SM1
– 1 x collector temperature sensor (NTC 20 K
)
– 1 x tank temperature sensor (NTC 10 K
)
Specification
Delivered Condition
Construction
The solar control module contains:
- PCB
- Terminals:
- 4 sensor inputs
- Solar circuit pump output
- 1 relay for switching an injection pump or motorized
valve
- KM BUS connectivity
- Power supply (on-site ON/OFF switch)
Cable length
8.2 ft. (2.5 m)
Sensor type
Viessmann NTC 20 k
Ω
,
at 77°F ( 25°C)
Permissible ambient temperature:
– During operation
−
4 to +392°F
(
−
20 to +200°C)
– During storage and transport
−
4 to +158°F
(
−
20 to +70°C)
Tank temperature sensor
For connection inside the module.
On-site extension of the connecting lead:
– 2-core lead, length max. 197 ft. (60 m)
AWG 15-16 [cross-section of 0.00233 in
2
(1.5 mm
2
)]
– Never route this lead immediately next to 120/240VAC
cables
Cable length
12.3 ft. (3.75 m)
Sensor type
Viessmann NTC 10 k
Ω
,
at 77°F (25°C)
Permissible ambient temperature
– During operation
32 to +190°F
(0 to +90°C)
– During storage and transport
−
4 to +158°F
(
−
20 to +70°C)
For systems with Viessmann DHW tanks, the SM1 tank
temperature sensor is installed in the solar brass elbow
(standard delivery or accessory for the respective DHW
tank) in the heating water return.
Rated voltage
120 V~
Rated frequency
60 Hz
Rated current
2 A
Power consumption
1.5 W
Safety category
I
Permissible ambient temperature:
– During operation
32 to 104°F ( 0 to +40°C)
use in the living space or
boiler room (standard
ambient
conditions)
– During storage and transport
−
4 to +150°F
(
−
20 to +65°C)
Rated relay output breaking capacity:
– Semi-conductor relay
1 (1) A, 120 V~
– Relay 2
1 (1) A, 120 V~
– Total max.
2 A
