Crown Boiler AWR Series Installation Instructions Manual page 30

12) Check the manifold pressure and adjust if necessary. To do this, use the following procedure:
a) Connect a manometer to the inlet pressure tap on the gas valve (see Figure 10.2).
b) Check the inlet line pressure with all gas appliances on and off. The inlet pressure at the boiler must be within the
following limits regardless of what combination of appliances is firing:
c) If the inlet pressure falls outside of these limits, find and correct the cause of the problem before proceeding further.
d) Connect a manometer to the manifold (outlet) pressure tap on the gas valve (Figure 10.2).
e) Read the manifold pressure. It should be set at:
f) If a manifold pressure adjustment is needed, make the adjustment by turning the regulator screw (see Figure 10.2)
clockwise to raise the pressure and counter-clockwise to reduce the pressure. If a manifold pressure adjustment is
made, recheck the inlet pressure after making the adjustment to be certain that it is still within acceptable limits.
Replace the cover screw on the regulator.
13) Check Main Burner Flame - See Figure 10.5. Flame should have a clearly defined inner cone with no yellow tipping.
Orange-yellow streaks caused by dust should not be confused with true yellow tipping.
14) 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 10.5
LP Gas Only. The pilot burner produces three (3) flames. The center flame should be steady, medium hard blue
enveloping 3/8 to 1/2 inch of sensing probe. See Figure 10.6.
Avoid operating this boiler in an environment where saw dust, loose insulation fibers, dry wall dust, etc. are
present.
15) Gas valve safety shutdown test - With main burners firing, disconnect ignition cable from ignition module. Both pilot
burner and main burners should stop firing.
16) Check High Limit Control - Jumper thermostat connections in boiler wiring harness. Allow burners to operate until
shutdown by limit (factory setting is 180F). REMOVE JUMPER WHEN TEST IS COMPLETE.
17) Check LWCO Operation – Push and hold the LWCO TEST button while the boiler is firing (Fig 10.1). The burners should
shut down and the yellow light illuminate on the LWCO. Upon releasing the TEST button, the yellow light should go off
and the boiler fire.
18) Check Thermostat Operation - Raise and lower temperature setting to start and stop boiler operation. Adjust thermostat to
normal setting.
19) Check of External Safety Devices - Verify proper operation of any field installed safety devices, such as external limits.
20) Combustion Chamber Burn-off
a) The mineral wool combustion chamber panels may contain a cornstarch based binder that must be burned out at
installation to prevent odors during subsequent boiler operation.
b) Ventilate the boiler room, set the high limit to its maximum setting, set the thermostat to call for heat. Allow the boiler
to fire for at least an hour or until the odor from the cornstarch has dissipated.
c) Return the high limit and thermostat to their desired settings.
21) System Leak Check - After the boiler has operated for at least 30 minutes, check the boiler and heating system piping for
leaks. Repair any leaks found at once.
System leaks can cause severe boiler damage.
22) Inspect the vent system for flue gas leaks - Repair any leaks found before leaving the boiler in operation.
Inlet Press
(inches w.c.)
Minimum
Maximum
Manifold Press. (inches w.c.)
Natural Gas LP Gas
5.0 11.0
14.0 14.0
Natural Gas LP Gas
3.5 10.0
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CAUTION
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CAUTION
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