Daikin Rotex GW-20 C22 Installation Instructions Manual page 71

5.1.3 Dividing CH installation in groups in case of additional heat
sources
Operating principle
If the room thermostat switches off the boiler because another heat source (wood heater,
open fire etc.) heats the room, the other rooms may cool down. This can be resolved by
splitting the CH installation into two zones. The zone with the external heat source (Z2)
can be shut off from the main circuit by means of an electrical shut-off valve. Both zones
are fitted with their own room thermostat.
Please note: "external heat source" regulation may only be applied if no extra external
boiler has to be heated up (installation type 1).
Installation instructions
1. Install the valve in accordance with the connection diagram.
2. Connect the room thermostat of zone 1 to X4 – 6/7.
3. Connect the room thermostat of zone 2 to X4 – 11/12.
4. Change parameter A (see Parameter settings via the service code par. 7.2).
Please note: The room thermostat in zone
thermostat in zone 2 may be an OpenTherm thermostat or an on/off thermostat.
Connection diagram "external heat source" regulation
A. Boiler
B. Electrical shut-off valve 230 V ~
C. Radiators
T1. Room thermostat zone 1
T2. Room thermostat zone 2
Z1. Zone 1
Z2. Zone 2
be an on/off thermostat. The room
1 MUST
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