Checking Gas Pressure; Measuring Inlet Gas Pressure - Amana GUIA070A30 Service Instructions Manual

S-18 CHECKING GAS PRESSURE
Gas Supply Pressure Measurement
CAUTION
To prevent unreliable operation or equipment damage,
the inlet gas supply pressure must be as specified on
the unit rating plate with all other household gas fired
appliances operating.
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 specified below. The supply pressure can be mea-
sured at the gas valve inlet pressure tap or at a hose fitting
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.
WARNING
Disconnect Electrical Power and Shut Off Gas Supply:
1. After turning off gas to furnace at the manual gas shutoff
valve external to the furnace, remove burner compartment
door to gain access to the gas valve.
3. 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
two figures.
Note: At either location, a hose fitting must be installed prior
to making the hose connection.
Gas Valve Control
ON/Off Switch
INLET
Open to
Atmosphere
Inlet Pressure Tap
(Side of Valve)
Pressure Regulator Adjustment
Manometer Hose
Manometer

Measuring Inlet Gas Pressure

(Gas Valve Tap)
86
Rev. 2
SERVICING
W R
M 1
P 3
O
F
OUTLET
F
C 2
ON
Outlet (Manifold)Pressure Tap
(Side of Valve)
(Under Cap Screw)
Gas Line
Gas Shutoff Valve
Drip Leg Cap
With Fitting
Manometer Hose
Measuring Inlet Gas Pressure
(Alternate Method)
4. Turn ON the gas and electrical power supply and oper-
ate the furnace and all other gas consuming appliances
on the same gas supply line.
5. Measure furnace gas supply pressure with burners fir-
ing. Supply pressure must be within the range specified
in the following table.
Inlet Gas Supply Pressure
Natural Gas Minimum:5.0" W.C. Maximum :10.0" W.C.
Propane Gas Minimum:11.0" W.C. Maximum :13.0" W.C.
If supply pressure differs from above, make necessary ad-
justments to pressure regulator, gas piping size, etc., and/
or consult with local gas utility.
WARNING
Disconnect Electrical Power and Shut Off Gas Supply:
6. Disconnect manometer after turning off gas at manual
shutoff valve. Reinstall plug before turning on gas to fur-
nace.
7. Turn OFF any unnecessary gas appliances started in
step 3.
8. Turn on gas to furnace and check for leaks. If leaks are
found, repair and then reinstall burner compartment door.
9. Turn on electrical power and verify proper unit opera-
tion.
Gas Line
To Furnace
Open To
Atmospere
Manometer