Intergas Heating Ltd
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8.2.2 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
3. the current and adjust this accordingly.
4. The allowed maximum electrical resistance of the room thermostat and wiring is 15 Ohm.
8.2.3 Timer - room thermostat
A 3VA-24DC power supply is available for a room thermostat. Connect the timer room
thermostat according to § 8.3.1.
8.2.4 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 tot 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, the loop in 6 – 7 must be removed.
8.2.5 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 ).
8.2.6 230 volt room thermostat
To be connected to contacts 1 and 3 of connector X2 and remove link 6-7.
See electrical diagram.
Warning High Voltage
Isolate the appliance from the electrical supply before
connecting the thermostat.
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