SERVICING
20
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Orices should be treated with care in order to prevent
damage. They should be removed and installed with a box-
end wrench in order to prevent distortion. In no instance
should an orice be peened over and redrilled. This will
change the angle or deflection of the vacuum effect or
entraining of primary air, which will make it dicult to adjust
the ame properly. This same problem can occur if an orice
spud of a dierent length is substituted.
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Gas inlet and manifold pressures should be checked and
adjusted in accordance to the type of fuel being consumed.
The line pressure supplied to the gas valve must be within the
range specied below. The supply pressure can be measured
at the gas valve inlet pressure tap or at a hose tting installed
in the gas piping drip leg. The supply pressure must be
measured with the burners operating. To measure the gas
supply pressure, use the following procedure.
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1. After turning o gas to furnace at the manual gas shuto
valve external to the furnace, remove burner compartment
door to gain access to the gas valve.
2. Connect a calibrated water manometer (or appropriate
gas pressure gauge) at either the gas valve inlet pressure
tap or the gas piping drip leg as shown in the following
gures. Refer to Measuring Gas Pressure: Single Stage
Valves gure for single stage valve inlet pressure tap
connections.
At either location, a hose tting must be installed prior
to making the hose connection.
Use apapter kit #0151K00000S to measure gas
pressure on White-Rodgers 36J22 gas valves.
3. Turn ON the gas and electrical power supply and operate
the furnace and all other gas consuming appliances on
the same gas supply line.
4. Measure furnace gas supply pressure with burners ring.
Supply pressure must be within the range specied in the
following table.
Minimum: 4.5" w.c. Maximum: 10.0" w.c.
If supply pressure differs from above, make necessary
adjustments to pressure regulator, gas piping size, etc., and/
or consult with local gas utility.
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5. Disconnect manometer after turning o gas at manual
shuto valve. Reinstall plug before turning on gas to
furnace.
6. Turn OFF any unnecessary gas appliances started in step
3.
7. Turn on gas to furnace and check for leaks. If leaks are
found, repair and then reinstall burner compartment door.
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