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WARNING
Check the rating plate of
the boiler to ensure it is
configured for the fuel
you are using. If the fuel is
incorrect for the appliance,
a conversion kit must be
ordered from IBC and the gas
valve adjusted accordingly.
Failure to perform the
required fuel conversion can
result in an immediate hazard.
Gas Valve Adjust
Flue gas test port plug
STARTUP AND COMMISSIONING
HC SERIES BOILERS HC 13-50, HC 15-95, HC 15-96, HC 20-125, HC 33-160
The gas valve will automatically de-rate the maximum input in accordance with
the density altitude, by approximately 2% per 1,000' above sea level. The gas
valve's zero governor will ensure that the gas:air mixture is not be affected at
altitude.
To verify the proper operation of the gas valve in the field, the following procedure
can be carried out by a qualified technician (diagrams on this page).
1.
Turn off the boiler's gas shut off valve. With a small (1/8" or 3 mm) flat
screwdriver, open the inlet gas supply pressure test port by turning its
center-screw 1 full turn counterclockwise. Attach a manometer to the
pressure test port and turn on gas to appliance. Static manometer reading
should be ideally 7" w.c., for Natural Gas and 11" w.c. for Propane. Minimum
and maximum static pressure should be between 7" and 14" w.c. Monitor
pressure throughout the commissioning procedure. Pressure may droop up
to 1" to 2" w.c. at high fire.
2.
Allow the boiler to ignite / run against a large load, to maintain high fire. Enter
the High Fire Manual Mode by pressing both the Service
buttons together twice. "H" will be showing in the service display.
Do not make any adjustments if an "h" is showing in the service display.
Allow the boiler to operate at High Fire for 3 minutes to stabilize. (The boiler
will operate in manual mode for 10 minutes then switch back to the normal
operating mode. To extend manual mode operation, press the Service
+
and Plus
together twice while the boiler is operating in manual mode to
reset the timer for 10 more minutes.) Pressing and holding
2 seconds while in the Service Mode will display the Flame Current in DC
microamps. Expect approximately 9.8μA at High Fire (6.5μA or higher at Low
Fire).
3.
With a combustion analyzer probe in the flue gas test port, turn the High Fire
(Gas : Air Ratio Adjustment) screw (see diagrams on this page) to achieve
results. This screw offers very fine adjustment, and may require several
turns. Clockwise richens, i.e. raises the CO
Clock the gas meter to confirm full maximum rating plate input. Check
NOTE:
the measured results with Table 10 - High Fire.
Switch the boiler to low fire by pressing both the Service
4.
-
Minus
buttons at the same time. The boiler will drop to low fire. "L" will be
showing in the service display. Compare the readings with Table 10 - Low
Fire.
5.
Switch off the boiler by pressing the On/Off
the boiler gas shut off valve. Remove the flue gas analyzer from the test port
and reinstall the test port cap. Remove the gas pressure manometer from the
gas valve and close the test port. Turn on the gas at the boiler's gas shut off
valve. Ensure there are no gas leaks and reinstall the front cover. Turn on the
boiler by pressing the On/Off
CO
VALUE (%) AT HIGH FIRE WITH THE FRONT COVER OPEN
2
Max. CO
value
2
Min. CO
value
2
CO
VALUE (%) AT LOW FIRE WITH THE FRONT COVER OPEN
2
Max. CO
value
2
Min. CO
value
2
Table 10: CO
Values and High and Low Fire
2
value.
2
button. Turn off the gas at
button.
NATURAL GAS
10.1%
9.1%
= value at High
9.1%
+
and Plus
NOTE:
+
for more than
button and
PROPANE
11.5%
9.8%
= value at High – 0.3%
9.5%
3-3
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