Intergas Heating Ltd
25
8.3.2 On / off room thermostat (low voltage)
To be connected to contacts 6 and 7 of connector X4.
This is a 24 volt connection and no mains power must be applied to these terminals.
See chapter 13, electrical diagram.
Note
When a 24 volt thermostat is connected to contacts 6 and 7, the loop in 6 – 7 must be
removed
1. The on/off room thermostat has to be connected to the contacts 6 and 7 of connector X4.
2. Adjust the feedback resistance of the room thermostat to 0.1 A. In case of doubt measure
the current and adjust this accordingly.
3. The allowed maximum electrical resistance of the room thermostat and wiring is 15 Ohm.
8.3.3 Open Therm room thermostat
Open therm is a protocol that enables the boiler and the room thermostat to
communicate. Based on the information from the room thermostat the flow temperature
of the boiler is adjusted to the most optimal value.
The Open Therm (OT) room thermostat has te be connected to the contacts 11 and 12
of connector X4 (see chapter 13, electrical diagram).
CAUTION
Connecting the Open Therm room thermostat to other
contacts than 11 – 12 may damage the room thermostat !
NOTE
When an Open Therm thermostat is connected to contacts
11 and 12 of connector X4 , the loop in 6 – 7 must be
removed.
8.3.4 Outside temperature sensor
The appliance is equipped with a connection for an outside temperature sensor. The
outside temperature sensor can be used in combination with an on/off room thermostat
or an OpenTherm thermostat.
Connect the outside temperature sensor (See § 8.3.1).
For the heating line setting, see weather-dependent regulation (See § 10.6 ). The sensor should
be fitted where possible on a north facing wall.
8.3.5 230 volt room thermostat
To be connected to contacts 1 and 3 of connector X2.
See electrical diagram.
NOTE
When a 230V thermostat is connected, link in 6 - 7 of connector X4
must be removed
Warning High Voltage
Isolate the appliance from the electrical supply before
connecting the thermostat.
8.3.6 S and Y zone plans
Any combination of external controls for time /temperature and heating of external DHW
cylinders or CH zones can be connected to the boiler.
All controls/ zones should be connected in an external wiring centre and a switched live
connected to 1 on X2. Set in-built timer to C-ON.
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