41
Figure 35 - Gas valve
C - Service pressure probe
D - Inlet gas pressure probe
E - High fire, CO2 adjusting screw
F - Low fire, CO2 adjusting screw
11 - OPERATING
11.7 - Gas supply
pressure checking
and adjustment
The gas supply pressure must match
that listed on the boiler rating label.
Check the gas supply pressure by
following the steps below:
close the manual gas shut off valve,
figure 16 and 17, item “3”;
follow the steps in section 13.2 or
13.3 to remove the front cover;
turn the screw in pressure
connection “D” shown in figure 35
three turns counterclockwise;
connect a manometer with
graduations of at least 0.1 in.W.C.
(0.25 mbar)
;
open the manual gas shut off valve,
figure 16 and 17, item “3”;
check that the gas supply pressure
does not exceed the “maximum gas
supply pressure” as stated on
section 14;
turn the power switch to on and
generate a heat demand by turning
knob “33” shown in figure 1 to its
maximum setting. Also ensure that
the room thermostat is calling for
heat;
press the
and
keys at
the same time for more than 10
seconds, the display will show
;
press the
key until the
display shows
. Now the boiler
will run for 10 minutes at maximum
input;
check the manometer to make sure
the gas supply pressure does not
drop below the “minimum gas
supply pressure” as stated on
section 14. If the gas supply
pressure does not fall within the
above values, adjust the upstream
gas pressure regulator to bring the
gas supply pressure within the
maximum and minimum range listed
on section 14.
At the end of the check, turn the screw
in pressure connection “D” in figure 35,
clockwise until snug and checking for
any gas leaks.
CAUTION!!! Never force the
pressure connection screw or the gas
valve will be damaged!
WARNING!!! Never use an open
flame to check for gas leaks, a fire
or an explosion could result
causing severe personal injury or
death!
Summary of Contents for ONEX
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