Gas Valve Adjustment - Chappee 1.45 FF HTE Installers And Users Instructions

14. Gas valve adjustment

IMPOR
Carry out the following operations in the given sequence:
1) Calibration of the maximum heat output. Check that the CO
operating 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 and anticlockwise to increase it.
2
2) Calibration of reduced heat output. Check that the CO
rating at the 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 and anticlockwise to reduce it.
2
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
K:
OFFSET adjuster screw
TANT: If the appliance is being converted from natural gas to propane (LPG), the following
operations must be performed before calibrating the gas valve as instructed above.
• Turn adjuster screw (V) on the gas valve clockwise through the number of complete revolutions
specified in table 3.
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
symbol (about 6 seconds).
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
vely;
3) press either of the two
Figure 14
2
Figure 13
keys to exit the function.
25
measured on the flue, with the boiler
2
measured on the flue, with the boiler ope-
keys respecti-