IBC Technologies VFC 160 Installation And Operating Instructions Manual - page 16
IBC Technologies Inc.
- 16 -
VFC 160
2.1 PRIOR TO START-UP
Ensure venting system is complete and
seal tested. Confirm any common venting
system at the installation site is isolated
and independent of the VFC boiler and
that any holes left from removal of a
previous boiler have been sealed. Fill
condensation trap to full 5” (min.) neck
height. Check water piping system is fully
charged, and that all air has been
discharged through loosened bleed caps.
Use a minimum operating water pressure
of 12 psig. Perform a final check of
electrical wiring.
2.1.1 Test Ignition System Safety
Shutoff Device
With the boiler in operation, test the
ignition system safety shutoff device by
shutting the manual gas valve immediately
outside the boiler case. Ensure boiler has
shut off and error and gas valve lights are
flashing. To restart boiler, reset power.
2.2 GAS VALVE ADJUSTMENT
The gas valve is factory pre-set for proper
gas/air mixing at mean sea-level pressure,
however some adjustment may be
required, e.g. for altitude.
To ensure gas input is set to the desired
boiler output, set the gas valve using the
method described in this section. A
pressure measurement gauge (with
0.1”w.c. divisions) should be used as
shown in Figure 13.
Table 6 - Gas Valve Adjustment
1. Ensure that vents are not obstructed
(see Troubleshooting Guide)
2. Set pressure measurement gauge to 0
3. Connect pressure measurement gauge
as shown in Figure 12
4. Increase blower speed from lowest
setting (using manual Fan Speed
screw as shown in Figure 13) until
pressure switch indicator illuminates
5. Open gas supply and start boiler
6. Raise thermostat to trigger call-for-
heat. Within 40s, gas valve will open
and boiler will attempt to ignite
7. Once stable combustion has been
achieved, remove set screw on top of
gas valve. Turn calibration screw on
gas valve until pressure gauge reads
3.0” w.c. Ensure set screw has been
returned to its original position.
Figure 12. Gas Valve Adjustment
Ignition Module
Pressure Switch
Operator
Flow Switch
Vent Hi-Lim it
W ater Hi-Lim it
Fan Speed
Fan
Therm ostat
24 V
AC
Pum p
Set Point
80°F
180°F
H
L
Call for Heat
Pow er
FXFR
Fan adjust
Figure 13. Fan Adjustment Screw