Gas Valve Adjustment - Potterton WH 46 Installation, Operation And Maintenance Manual

Carry out the following ope rations in the given sequence:
1) Calibration of the maximum heat output. Check that the CO
at the maximum heat output, is the same as that shown in table 1. Otherwise, turn the regulation screw (V) on
the gas valve. Turn the screw clockwise to reduce the concentration of CO
2) Calibration of reduced heat output. Check that the CO
minimum heat output, is the same as that shown in table 1. Otherwise, turn the offset regulation screw (K) on
the gas valve. Turn the screw clockwise to increase the concentration of CO
Pi: Gas supply pressure connection point
P out: Gas pressure to burner connection point
P: Pressure connection point
for measurement of the OFFSET
Pl: Air signal input from fan
V: Gas flow adjuster screw max fire
K: OFFSET adjuster screw min fire
To simplify calibration of the gas valve, the "calibration function" can be set directly on the boiler control panel
by proceeding as follows:
1) Press the keys (2-3) together until the display shows the pointer " " alongside the
(about 6 seconds) (see fig. 16).
2) Press the keys to set the fan speed at the minimum and maximum heat output (%PWM);
N.b - to set the minimum and maximum heat output quickly, press the
3) press either of the two
Figure 16
INSTRUCTIONS PERTAINING TO THE INSTALLER

15. GAS VALVE ADJUSTMENT

keys to exit the function.
27
measured on the flue, with the boiler operating
2
and anticlockwise to increase it.
2
measured on the flue, with the boiler operating at the
2
and anticlockwise to reduce it.
2
Figure 15
and symbols
keys respectively;
926.772.1 - GB/IE