Instruction manual WWH-EC and WWH-LT Air heater
Page 8/14
4
Electrical connection
4.1 230Vac supply
The installation must comply with all applicable local and/or national standards.
There should be a suitable electrical group with a main fuse. There is an electrical diagram further on in
this guide.
The supply is 230Vac (50 Hz) with earth.
Isolation switch or power plug
The heater has to be equipped with a 230 Volt isolation switch or power plug. This switch should
disconnect phase and neutral (not earth) and have a 3mm contact opening at least. Switches or power
plugs must be accessible at all times.
4.2 General functioning of the unit
The WWH is simply described as a radiator with a ventilator at the back. If there is hot water flowing
through the radiator, and the heater is on, the heater will blow hot air. But when hot water is flowing
through the radiator and the heater is off, the heater will not discharge hot air. If the fan is turned on, but
the boiler water is cold, there could be draught. This must be prevented.
The installation should have some kind of control to make turning on/off the hot water boiler and the fan of
the WWH separately, possible. The WWH and the boiler are 2 separate systems. Both systems need to
be controlled. There are several ways to do this. It depends on the situation and needs of the user, what
combination of controls will work best.
4.3 Connecting options
4.3.1
Connection with only a room thermostat
This option is only possible when there is a continuous hot water supply. The hot water boiler should have
its own control.
Operation:
The on/off room thermostat will switch on the fan of the WWH when there is heat demand. The fan will
blow air over the heat exchanger. If the water is hot, the heater will discharge hot air. If the water is cold
the heater will blow cold air, this can be experienced as draught.
The boiler must be switched on/off separately. Therefore a second room thermostat is required.
M
L (230V AC)
T
1
3
2
Ruimte thermostaat
Room thermostat
Raumthermostat
Thermostat d´ambiance
art: IW.3950
Motor WWH
N
