The control of the heat demand of the 2 zones depends on the applied boiler type.
An on/off boiler or an OpenTherm® modulating boiler can be applied.
The 2-channel Receiver box receives from both zone thermostats the heat demand and will control the
corresponding zone valve via the relay contact to open.
For the cycle rate setting recommend the standard setting 6x per hour.
When an on/off boiler is applied, it can only be controlled on/off by means of the zone valve end switches
For an OpenTherm® boiler, use the OpenTherm® connection on the 2-channel Receiver box.
ON/OFF controlled boiler
The boiler will be switched on when one of the zone valves is completely opened and the end switch switches.
When both end switches are not switched, the boiler is off.
The cycle rate setting determines also the cycle rate of the boiler.
There is no synchronization of the heat demand of the 2 zone thermostats, which could cause the boiler to
switch off (end demand of a zone) and almost instantly switch on again by the demand of the other zone.
Some boilers have an anti-cycle time, which prevents them from switching on directly again.
OpenTherm® controlled boiler
When one of the zone thermostats communicates a demand the OpenTherm® will also be receiving a heat
demand. When both zones no longer require heat the demand is taken away and the boiler will switch off.
The 2-channel Receiver box constantly compares the demand of both zones and communicates the highest
demand to the OpenTherm® boiler.
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