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Gas input to boiler can be adjusted by removing
protective cap on pressure regulator (Figures 16-
18) and turning screw clockwise
input and counterclockwise
Manifold pressures are taken at outlet side of gas
valve. (Figure 16 and 18) To check for proper fl ow
of natural gas to boiler, divide input rate shown on
rating plate by heating value of gas obtained from
local gas company. This will determine number of
cubic feet of gas required per hour. With all other
gas appliances off, determine fl ow of gas through
meter for two minutes and multiply by 30 to get
hourly rate. Make minor adjustments to gas input as
described above.
Burner orifi ces should be changed if fi nal manifold
pressure varies more than plus or minus 0.3 inches
water column from specifi ed pressure.
Primary air adjustment is not necessary, therefore air
shutters are not furnished as standard equipment. Air
shutters can be furnished on request where required
by local codes or conditions.
CHECK SAFETY CONTROL CIRCUIT. Ignition system
safety shutoff device must be tested after placing boiler
in operation.
Pilot:
With main burner operating, turn pilot gas
1.
adjusting screw clockwise
turned off. (Figures 16-18 on previous pages) Within
90 seconds main gas control should close, shutting off
gas to main burner.
High Limit Control (Figure 23)
2.
and note temperature setting. Decrease this setting
to minimum and operate boiler. When boiler water
temperature exceeds control temperature setting,
control will open circuit, closing automatic main gas
valve.
CHECKING GAS INPUT RATE TO BOILER
to increase
to decrease input.
until pilot gas is
: Remove cover
23
Figure 23
High Limit
Front Lower
Jacket Panel
Gas Valve
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