Dividing Ch Installation In Groups In Case Of Additional Heat Sources; Operating Principle; Installation Instructions - Rotex GW-20 H42 Installationsanleitung

5.1.2 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: This "external heat source" regulation may only be applied if no extra
external tank 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
Connecting external tank
For the connection of the RHOB*AAV1H to an indirectly fired tank, the following is
delivered upon order:
•
Tank sensor
•
Three-way valve set 230V
Connect the tank and three-way valve to the boiler in accordance with the diagram.
Remove the through connection between 9 and 10 to connector X4. Connect the three-
way valve to connector X2 and connect the tank sensor or thermostat to connector X4
in accordance with the wiring diagram (see par. 10.2).
Connection diagram indirectly fired tank
C. Unit
D. Tanks
E. CH installation
F. Expansion vessel
G. Safety valve 3 Bar
H. Three-way valve
I. Tank sensor or thermostat
Note
When an on/off tank thermostat is used, the heat request will start when the thermostat is
opened, and it will end when the thermostat closes again.
In case of old installations or domestic hot water circuits which can contain small particles,
install a filter in the domestic hot water circuit.
This pollution could cause a fault during domestic hot water operation.
be an on/off thermostat. The room
1 MUST
16