Instruction manual GWV 17
gis
Pressure measurements are made at the air distribution plate (high pressure)
and in a Venturi in the burners (low pressure).
The table shows the trip point per appliance.
Note
The trip point of the pressure switch is not adjustable.
Pressure switch trip points
2.4.6 Flame probe
To ensure that no gas can flow when there is no combustion, the water heater
has a flame probe (14). The electronic controller uses this probe for flame
detection, by means of ionisation detection. The electronic control closes the
gas valve as soon as it detects that no flame is present.
2.4.7 Flow-through switch
the flow-through switch (29) guarantees the flow of water through the appliance
(before operation and while the appliance is running). The standard position of
the flow-through switch is open. When the flow is sufficient, the switch closes
and the heating cycle starts. If the flow of water through the appliance gets too
low, then the switch opens, which interrupts the heating cycle; this is to prevent
overheating.
Flow measurement is done in the return line between the appliance and the
storage tank.
Appliance Closing pressure
differential
Opening pressure
differential
GWV 120 > 80 Pa < 66 Pa
GWV 150 > 89 Pa < 75 Pa
GWV 200 > 107 Pa < 92 Pa