3-3
STARTUP AND COMMISSIONING
SL 20-115 MODULATING GAS BOILER
To verify the proper operation of the gas valve in the field, the following procedure
can be carried out by a qualified technician
(see Figure 38).
1.
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 5” and 14” w.c. Monitor pressure throughout the comissioning
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
3.
With a combustion analyzer probe in the flue gas test port, turn the Gas:Air
ratio adjustment screw
(see Figure 38, “B”)
to achieve 25% excess air (
see
Table 8 below for corresponding CO2 values - set for CO2 at high fire
). this
screw offers very fine 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. Reading should be within 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.
MODEL
HIGH FIRE
LOW FIRE
CO MAx
PPM
CO
2
RANGE CO
2
TARGET CO
2
RANGE CO
2
TARGET
sl 20-115 (natural gas)
8.4 to 9.6%
9.4%
8.0 to 9.4%
8.8%
< 100
sl 20-115 (Propane)
9.6 to 11.0%
10.7%
9.2 to 10.7%
10.1%
< 150
Table 8: Combustion test target ranges - CO
2
/ Maximum CO
Figure 38: Gas Valve and Pressure Reference System
Flue gas test port plug
Gas:Air ratio adjustment screw
Zero-offset adjustment screw
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.
DANGER
Operating any IBC boiler using
a fuel other than the fuel listed
on its rating plate is prohibited.
If the information in this section
related to conversion to
alternate fuels is not followed
exactly, a dangerous situation
can result, leading to fire or
explosion, which may cause
property damage, personal
injury, or loss of life.
