Checking Gas Pressure - Goodman ACS series Service Instructions Manual

SERVICING
A
The length of Dimension "A" determines the angle of 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.
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.
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.
GAS
STREAM B
DENT OR
BURR
GAS
STREAM B
CAUTION
WARNING
Gas Valve
On/Off
Selector
Switch
INLET
Inlet Pressure Tap
Pressure Regulator
(Side of Valve)
(Under Cap Screw)
White-Rodgers Model 36F22
Gas Valve
On/Off
Selector
Switch
OUTLET
Pressure Regulator
Adjustment
(Under Cap Screw)
White-Rodgers Model 36G22
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
White Rodgers 36E
(Gas Valve Tap)
OUTLET
Outlet (Manifold)
Pressure Tap
Adjustment
Inlet Pressure
Tap
INLET
Outlet Pressure
Tap
WR
M 1
P 3
O
F
OUTLET
F
C 2
ON
OUTLET (MANIFOLD) PRESSURE TAP
(SIDE OF VALVE)
(UNDER CAP SCREW)
119