Specifications - Viessmann Solar EM-S1 Extension Installation And Service Instructions Manual

Function/Specification
Function Description of Solar DHW Heating
Reduction of stagnation time
If there is an excess of solar energy, the speed of the
solar circuit pump is reduced before the maximum DHW
tank temperature is reached (parameter 1125.0). This
causes an increase in the differential between collector
temperature and DHW tank temperature. The heat transfer
to the DHW tank is reduced, which delays stagnation.
The temperature differential for reducing the stagnation
time can be adjusted in parameter 1505.
This function can only be implemented in systems with
a variable speed solar circuit pump.
Collector frost protection
Viessmann collectors are filled with Viessmann heat
transfer medium. Consequently, this function does not
need to be enabled.
Only enable it if water is used as the heat transfer
medium.
To prevent damage to the collectors, the solar circuit
pump is switched on if the collector temperature falls
below +5°F (+5°C). The pump is switched off when
+13°F (+7°C) is reached.
Note: parameter 1127.0.

Specifications

14
Solar EM-S1 Extension Installation / Service
(continued)
Interval function solar circuit pump
Set parameter 1719.0.
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.
For correct capture of the collector temperature, the
interval function cyclically switches on the solar circuit
pump for brief periods.
Relay kick
To prevent the pumps and valves from seizing up, they
are started for about 10 s every 24 h.
Rated voltage
Rated frequency
Rated current
Power consumption – electronics 2 W
Power consumption
Permissible ambient temperature
Operation
Storage and transport
Rated relay output breaking
capacity
P 1 (solar circuit pump)
P 3 (transfer pump)
120VAC
60 Hz
2A
9 mA
32°F to 104°F
0°C to +40°C)
(
-4°F to 149°F
(–20°C to +65°C)
1A 120VAC
1A 120VAC