IBC SL 20-160 G3 Installation And Operating Instructions Manual page 49

DANGER
Making adjustments to the IBC gas
valve without a properly calibrated
gas combustion analyzer and by
persons who are not trained and
experienced in its use is forbidden.
Failure to use an analyzer can
result in an immediate hazard.
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.
STARTUP AND COMMISSIONING
SL 10-85 G3, SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS
To verify the proper operation of the gas valve in the field, the following procedure must
be carried out by a qualified technician (see Figure 44 for details of the gas valve and
pressure system ).
1. With a small (1/8" or 3 mm) flat screwdriver, open the inlet gas supply pressure test
port by turning its center-screw one full turn counterclockwise. Attach a manometer
to the pressure test port and turn on the gas to the appliance. The 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 5" and 14" w.c. Monitor pressure
throughout the commissioning procedure. Pressure may droop up to 1" to 2" w.c. at
high fire but under no circumstances should it drop below 4" w.c. at the gas valve
inlet test port.
2. Allow the boiler to ignite / run against a large load to maintain high fire.
You can temporarily define a load as Manual for direct control of the boiler firing rate
as long as the load number is associated with a pump that can remove the heat.
Closing the corresponding Therm connection initiates manual firing.
3. With a combustion analyzer probe in the flue gas test port, turn the Gas:Air Ratio
Adjustment screw (see Figure 44) to achieve results (see Table 7 below for the
corresponding CO values - set the CO
2
adjustment, and may require several turns.
Note: This screw has significant backlash. When changing direction of turn, it may
take up to a full turn before any change is indicated on the analyzer reading. Clock
the gas meter to confirm full maximum rating plate input.
4. Confirm the minimum fire level settings. Re-define the load as "Manual Control".
Use Heat Output in "Configure Load x" to control the output as needed. The reading
should be within the Low fire range. Re-test at high fire.
5. Turn boiler off by removing the call for heat (use the Heat Load Configuration screen
to turn load to off if no other ready means available), then remove the manometer
connections, and turn the centre-screw in the manifold pressure test port 1 full turn
clockwise. Ensure fully closed, but not over-tightened. Restore gas and soap test for
leaks.
FUEL
RANGE
Natural Gas 9.0 – 10.0
Propane 10.3 – 11.3
Note: Low Fire CO
should be at least 0.5% lower than High Fire CO
2
Table 7: Combustion test target ranges - CO
target at high fire). This screw offers very fine
2
HIGH FIRE
TARGET RANGE
9.5 8.2 – 9.2
10.8 9.3 – 10.3
/ Maximum CO
2
CO MAX
LOW FIRE
PPM
TARGET
8.7 < 150
9.8 < 250
2
3-3