106636-02 - 12/19
20
X-2
Installation, Operating & Service Manual
9
System Start-up and Checkout
(continued)
2. PURGE AIR FROM GAS PIPING by loosening
(or removing) “Inlet Pressure Tap” plug on gas
valve (See Figure 9-3). Tighten (or replace)
plug when you start to smell gas. Adequate
ventilation must be provided and no smoking
or open flame permitted.
3. Locate and address leaks using listed
combustible gas detector,a non corrosive leak
detection fluid or other listed leak
detection method.
a. Check pipe fittings up to inlet of gas valve
b. Check piping between gas valve and
orifices (after boiler is operating).
c. Check piping between gas valve and pilot
(after boiler is operating).
4. Tighten appropriate pipe connections.
I. Check pilot burner flame.
Natural Gas Only .
Pilot produces single flame.
Flame should be steady medium hard blue
enveloping 3/8 to 1/2 inch of igniter-sensor tip.
See Figure 9-4.
3. Tighten appropriate pipe connections.
F. Perform limit check
1. Ensure gas to boiler is off
2. Set ROOM THERMOSTAT to lowest setting.
3. If limits are functioning properly (LWCO,
Auxiliary limit, flame rollout switch, blocked
vent switch, damper), boiler should spark.
If boiler does not spark, see Section 14
"Troubleshooting" for guidance.
4. Turn "OFF" the electric switch to boiler.
G. Start boiler according to "Operating Instructions"
in Figure 9-2.
H. Perform gas leak test downstream of boiler
manual shutoff valve.
1. Open manual shutoff valve.
E. Perform gas leak test upstream of boiler shutoff
valve.
1. Protect boiler gas valve.
a. For all testing over ½ psig, boiler
and manual shutoff valve must be
disconnected from gas supply piping.
b. For testing at ½ psig or less, isolate
boiler from gas supply piping by closing
boiler manual shutoff valve.
2. Locate leaks using listed combustible
gas detector, a noncorrosive leak detection
fluid or other listed leak detection method.
Figure 9-4: Pilot Burner Flame (NG Only)
Figure 9-5: Pilot Burner Flame (LP Only)
DANGER
Do not use matches, candles, open flames, or
other ignition source.
!
Figure 9-3: Top View of Gas Valves
LP Gas Only
. Pilot burner produces three (3)
flames. The center flame should be steady,
medium hard blue enveloping 3/8 to 1/2 inch of
sending probe. See Figure 9-5.
