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00BNO9168-I (U0606551)
VARMAX -
Installation, Use and Maintenance
7.8.2. For models 180 to 600
The measurements for adjusting the valve
must be made on the Pamont pressure tap
(see figure opposite).
Before starting the burner, on the gas valve, preset
the gas flow by acting on the gas flow adjustment
screw R1 according to the values given in the
table below.
Start the burner at maximum power.
Using a combustion analyzer, measure the rate
of CO2 in the flue gas: on the flue pipe, remove
the plug from the opening and introduce the CO2
measurement probe in the center of the flow in the
flue pipe
Check the CO2 value at maximum power and if
necessary, use the gas flow adjustment screw R1
on the valve to obtain the CO2 values in the table
below.
Change to minimum power Qmin and check that
the CO2 value is within the range of the table
below. If necessary, act on the setpoint adjustment
screw R2.
If the minimum power setting is changed, return
to maximum power Qmax and recheck the CO2
value. Repeat the operation until you obtain the
two values in accordance with the table below.
Return to standard operating mode.
figure 44 - Gas valve models 180 to 450
figure 45 -
Gas valve models 525 and 600
R2 offset
regulator
Gas flow adjustment
screw (injector) R1
(under cover)
U0501967-A
R2 offset
regulator
Gas flow
adjustment
screw (injector)
R1 (under
cover) Hex key
3 mm
Pamont
