CENTRAL HEATING Chofu - Room Thermostat Connection; Room Thermostat Wiring; Heating and Cooling Changeover; Heating and Cooling Mode Control

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Connect room thermostat wiring to terminals #20, #21 via the normally open contacts of the room thermostat. The
thermostat requires volt free contacts to open/close terminals #20, #21. If the thermostat features a switched live
output for on/o, an external relay with volt free contacts will need to be used. Open contacts = O; Closed contacts
= On. These terminals are enabled when changing parameter 5120. See system conguration for more details.
If your room thermostat has heating and cooling functionality it can change the operating mode of the heat
pump. Connect the thermostat changover wiring to terminals #24, #25 via the normally open contacts of the
room thermostat. The thermostat requires volt free contacts to open/close terminals #24, #25. If the thermostat
features a switched live output for changover, an external relay with volt free contacts will need to be used.
Open contacts = Heating; Closed contacts = Cooling. These terminals are enabled when changing parameter 5124.
See system conguration for more details.
Room Thermostat
Connection (remote contact)
Heating and Cooling
change over
Low voltage, not polarity sensitive.
DO NOT APPLY 230V TO THESE TERMINALS.
Low voltage, not polarity sensitive.
DO NOT APPLY 230V TO THESE TERMINALS.