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Frost protection unit
2-stage frost protection
on the air side
2-stage frost protection
on the water side
Response with several
inputs
Siemens
Building Technologies
10.7
Troubleshooting
Digital signals cannot be monitored.
A missing signal (= contact open) is interpreted as a frost alarm, which activates
the frost protection function.
A missing signal from the frost sensor is interpreted as a frost alarm, which
activates the frost protection function.
A missing signal from the frost sensor is interpreted as a frost alarm, which
activates the frost protection function.
If there is no outside temperature signal, the pump is permanently on. Setting value
"On according to outside temperature" must be set to 5 °C; refer to chapter 8
"Pump (PUMP x)".
If more than one input is configured as a frost protection input, the controller
accepts the first configured input as the frost protection input.
Universal Controllers RLU2...
Frost protection (FROST)
147 / 174
CE1P3101en
29.08.2008
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