IBC VFC 45-225 User Manual

3-3
STARTUP AND COMMISSIONING
VFC 15-150, VFC 45-225 MODULATING GAS BOILERS
procedure. Pressure may droop up to 1” to 2” w.c. at high re but under no
circumstances should it drop below 3” w.c. at the gas valve inlet test port.
2. Allow the boiler to ignite / run against a large load, to maintain high re
3. With the boiler at maximum output, use a 2 mm hex key to adjust the zero-
offset (see Figure 32, “A”) as required to achieve -0.2 to -0.3” wc. This
adjustment should only be necessary if this screw has been tampered with.
4. With a combustion analyzer probe in the ue gas test port, turn the Gas:Air
Ratio Adjustment screw (see Figure 32, “B”) to achieve the appropriate Table
8 mixture target at High Fire. This screw offers very ne adjustment, and
may require several turns. NOTE: This screw has signicant 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 conrm full
maximum rating plate input.
5. To conrm or adjust the minimum re level settings, Re-dene the load as
“Manual Control”. Use Heat Output in “Congure Load x” to control the output
as needed.
6. At the minimum ring rate, adjust the zero-offset screw (see Figure 32, “A”)
to obtain the target CO
2
value. It may be necessary to reduce the output in
stages if this adjustment has been tampered with.
7. Turn boiler off by removing the call for heat (use the Heat Load Conguration
screen to turn load to off if no other ready means available); turn OFF gas
supply to boiler, 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.
Zero-offset adjustment screw
Gas:Air ratio adjustment screw
Insertion of ue gas analyzer probeRemoval of ue gas test port plug
MODEL HIGH FIRE LOW FIRE CO MAX PPM
RANGE TARGET RANGE TARGET
VFC 15-150 (Natural Gas) 8.9 to 9.5% CO
2
9.2% CO
2
7.9 to 8.6% CO
2
8.4% CO
2
< 100
VFC 15-150 (Propane) 10.4 to 10.7% CO
2
10.6% CO
2
9.0 to 9.8% CO
2
9.6% CO
2
< 150
VFC 45-225 (Natural Gas) 8.9 to 9.5% CO
2
9.2% CO
2
7.9 to 8.6% CO
2
8.4% CO
2
< 120
VFC 45-225 (Propane) 10.4 to 10.7% CO
2
10.6% CO
2
9.0 to 9.8% CO
2
9.6% CO
2
< 180
Table 8: Combustion test target ranges - CO
2
/ Maximum CO

IBC VFC 45-225 Specifications

General

Brand	IBC
Model	VFC 45-225
Category	Boiler
Language	English