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VII. System Start-up
A.
Safe operation and other performance criteria were
met with gas manifold and control assembly provided
on boiler when boiler underwent tests specified in
American National Standard for Gas-Fired Low-
Pressure Steam and Hot Water Boilers, ANSI Z21.13.
B.
Check main burners. Rear of burner must be in
vertical slot in rear of burner tray. Front of burner must
be seated on orifice.
C.
Fill boiler with water to normal water line.
D.
Prepare to check operation.
1. Obtain gas heating value (in Btu per cubic foot)
from gas supplier.
2. Adjust limit. Adjust cut-in pressure for 2 psi and
differential for 1 psi.
3. Connect manometer to outlet pressure tap on gas
valve.
4. For natural gas-fired boiler, temporarily turn off all
other gas-fired appliances.
E.
Follow Lighting or Operating Instructions to place
boiler in operation. See Figure 21 for continuous
ignition (standing pilot) or Figure 22 for intermittent
ignition (EI).
F.
Sequence of Operation is located under wiring
diagram. See Table 8. If boiler equipped with
intermittent ignition fails to operate properly, see
Troubleshooting Tree on Page 26-27.
G.
Test gas piping and connections between Gas Valve
and Manifold, orifices, and pilot tubing while boiler is
operating. Locate leaks using approved combustible
gas detector, soap and water, or similar nonflammable
solution. Do not use matches, candles, open flames, or
other ignition source.
Figure 18: Pilot Burner Flame, Continuous Ignition
18
H.
Check pilot burner flame.
1. Continuous Ignition (standing pilot). See Figure
18. Pilot produces a single flame. Flame should be
steady, medium hard blue enveloping 3/8 to ½ inch
of thermocouple.
2. Intermittent Ignition (EI). See Figure 19. Pilot
produces three (3) flames. Center flame should be
steady, medium hard blue enveloping 3/8 to ½ inch
of sensing probe.
I.
Check main burner flame. See Figure 20. Flame
should have clearly defined inner cone with no yellow
tipping. Orange-yellow streaks should not be confused
with true yellow tipping.
J.
Check thermostat operation. Raise and lower
temperature setting to start and stop boiler operation.
K.
Check ignition system shutoff.
1. Continuous Ignition (standing pilot). Disconnect
thermocouple.
2. Intermittent Ignition (EI). Disconnect sensor cable
from Terminal 4 SENSE. Gas valve should close
and pilot and main burners should extinguish.
L.
Low Water Cutoff.
1. Adjust thermostat to highest setting.
2. With boiler operating, open drain valve and slowly
drain boiler.
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Figure 19: Pilot Burner Flame, Intermittent Ignition
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