Desa Master WA 33 Operating Manual page 34

8. Description of the operation of the device
Control panel
The controller of the WA 33 furnace for universal oil is equipped with four buttons which allow the user
to control the operation of the heater, and four diodes signalling the state of operation of the device.
Adjustment of
the furnace
efficiency
Fig.4. View of the front panel of the control module of the universal oil heater.
The following states characterise the operation of the device:
•Stop
•Lighting off
•Operation
•Damping
•Overheating
•Tank overflow
The heat is generated owing to burning the gas which is produced by oil heated to a high temperature. At
the moment of connection of the device to the mains, it is in the readiness state (Stop) and no heat is
produced, neither the fan nor the pump are operating. Pressing the Start button causes the green diode to
be backlit and the furnaces switches to lit off. After the furnace is heated to the temperature of 40 C the
contacts of the thermostat placed at the combustion chamber are closed, and oil supply pump and the air
supply fan are switched on. It is signalled by the yellow diode, which is backlit on the control panel. Due
to the smaller oil demand at the unheated furnace, the devices should operate on the first gear for at least
30 minutes (symbol on the panel „-„ means that the brightness of the light of the yellow diode is low).At
this time, the pump for the furnace supplies about 1.85 kg/h of oil. After thirty minutes of operation, it is
possible to switch on the second gear (the symbol on the panel is „+" which means that the brightness of
the light of the yellow diode is greater). At the time operation on the second gear, 2.55kg/h of oil is
supplied to the furnace.
The heater is switched off by pressing the Stop button on the control panel. At this moment, the pump is
switched off (the yellow and the green diode are switched off on the control panel). The air exhaust fan
Fig.3. Chimney installation
Furnace switch- Furnace breaker
key switch
the device is ready for starting the operation
initial phase of the device's operation
proper operation of the device
emergency switching off
emergency switching off
emergency switching off
Furnace overheating
indicator (STB thermostat)
Straight-through pan
overflow indicator
Furnace operation indicator
Furnace operation
readiness indicator
LED diodes
6