10.7 Troubleshooting
Digital signals cannot be monitored.
Frost protection unit
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.
2-stage frost protection
on the air side
A missing signal from the frost sensor is interpreted as a frost alarm, which
activates the frost protection function.
2-stage frost protection
on the water side
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.
Response with several
inputs
147 / 174
Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Frost protection (FROST) 29.08.2008
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