Ontrol With Zone Valve - Winterwarm WWH-EC Instruction Manual

4.4 Control with zone valve
The zone valve is applied on the WWH when one boiler has to heat several rooms separately. In this
situation the zone-valve will control the hot water boiler and hot water supply to the WWH. Operation in
short can be summarized as follows;

Heat demand is created through the room thermostat. RT switches 230Volt and powers the zone-
valve, this will switch the boiler on.

Boiler makes hot water.

Contact thermostat measures water temperature. If water temperature is higher than the
temperature set, CT will supply power to the WWH. The fan will blow. If a voltage regulator or
external 0-10V signal has been applied, this signal determines the fan speed.

If the requested temperature has been reached, the RT will open the contact and cut off power
supply to the zone-valve; the boiler will be shut off eventually.

CT measures a water temperature that is lower than the temperature set and will open the
contact. The fan will stop!
Instruction manual WWH-EC and WWH-LT Air heater
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