Goodman GMV series - S-307 CHECKING GAS PRESSURE

SERVICING
119
A
GAS
STREAM
B
The length of Dimension "A" determines the angle of Gas
Stream "B".
DENT OR
BURR
GAS
STREAM
B
A dent or burr will cause a severe deflection of the gas
stream.
S-307 CHECKING GAS PRESSURE
Gas Supply Pressure Measurement
T
O 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.
CAUTION
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
D
ISCONNECT 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 compart-
ment 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 pres-
sure tap or the gas piping drip leg as shown in the fol-
lowing figures.
NOTE: At either location, a hose fitting must be installed
prior to making the hose connection.
OUTLET
INLET
Pressure Regulator
Adjustment
(Under Cap Screw)
Gas Valve
On/Off
Selector
Switch
Inlet Pressure Tap
(Side of Valve)
Outlet (Manifold)
Pressure Tap
White-Rodgers Model 36F22
Pressure Regulator
Adjustment
(Under Cap Screw)
Gas Valve
On/Off
Selector
Switch
INLET
OUTLET
Inlet Pressure
Tap
Outlet Pressure
Tap
White-Rodgers Model 36G22
MANOMETER HOSE
O
F
F
ON
M
P
C
1
3
2
WR
INLET
OUTLET
PRESSURE REGULATOR ADJUSTMENT
(UNDER CAP SCREW)
INLET PRESSURE TAP
SIDE OF VALVE)
OUTLET (MANIFOLD) PRESSURE TAP
(SIDE OF VALVE)
GAS VALVE CONTROL
ON/Off SWITCH
MANOMETER
OPEN TO
ATMOSPHERE
Measuring Inlet Gas Pressure
White Rodgers 36E
(Gas Valve Tap)