Goodman GMEC96 Service Instructions Manual page 62

SERVICING
INLET
Gas Valve On/Off
Selector Switch
White-Rodgers Model 36J54 (Two-Stage)
Open to
Atmosphere
Outlet
Pressure Boss
Inlet
Pressure
Boss
White-Rodgers Model 36J54 Connected to Manometer
1. Turn OFF gas to furnace at the manual gas shutoff
valve external to the furnace.
2. Connect a calibrated water manometer (or appropri-
ate gas pressure gauge) at either the gas valve inlet
pressure tap or the gas piping drip leg. See White-
Rodgers 36J54 gas valve figure for location of inlet
pressure tap.
INLET GAS SUPPLY PRESSURE
Natural Gas Minimum: 4.5" w.c.
Propane Gas Minimum: 11.0" w.c.
NOTE: If measuring gas pressure at the drip leg, a field-
supplied hose barb fitting must be installed prior to
making the hose connection. If using the inlet pres-
sure tap on the White-Rodgers 36J54 gas valve, then
use the 36G/J Valve Pressure Check Kit, Part No.
0151K00000S.
3. Turn ON the gas 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
firing. Supply pressure must be within the range
specified in the Inlet Gas Supply Pressure table.
62
OUTLET
High Fire Regulator
Adjust
Regulator
Vent
Low Fire
Regulator
Adjust
Common
Terminal(C)
Maximum: 10.0" w.c.
Maximum: 13.0" w.c.
If supply pressure differs from table, make the necessary
adjustments to pressure regulator, gas piping size, etc.,
and/or consult with local gas utility.
5. Turn OFF gas to furnace at the manual shutoff valve
and disconnect manometer. Reinstall plug before
turning on gas to furnace.
6. Turn OFF any unnecessary gas appliances stated in
step 3.
G M P M
AS ANIFOLD RESSURE
Only small variations in gas pressure should be made by adjust-
ing the gas valve pressure regulator. The manifold pressure
must be measured with the burners operating. To measure and
adjust the manifold pressure, use the following procedure.
Gas Line
Gas
Shutoff
Valve
Drip Leg Cap
With Fitting
Manometer Hose
Measuring Inlet Gas Pressure (Alt. Method)
T
O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE
GAS MANIFOLD PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING
. O
PLATE NLY MINOR ADJUSTMENTS SHOULD BE MADE BY ADJUSTING
THE GAS VALVE PRESSURE REGULATOR
1. Turn OFF gas to furnace at the manual gas shutoff
valve external to the furnace.
2. Turn off all electrical power to the system.
3. Outlet pressure tap connections:
White-Rodgers 36J54 valve: Back outlet pressure test
screw (inlet/outlet pressure tap) out one turn (counter-
clockwise, not more than one turn).
4. Attach a hose and manometer to the outlet pressure
tap (White-Rodgers valve).
5. Turn ON the gas supply.
A
EASUREMENT AND DJUSTMENT
Gas Line
To Furnace
Open To
Atmosphere
Manometer
CAUTION
,
THE
.