52
SERVICING
INLET
OUTLET
Gas Valve On/Off
Selector Switch
White-Rodgers Model 36J54 (Two-Stage)
Inlet
Pressure
Boss
Low Fire
Regulator
Adjust
Manometer
Manometer
Hose
High Fire Regulator
Adjust
Regulator
Vent
Outlet
Pressure Boss
Open to
Atmosphere
On/Off Switch
High Fire Coil
Terminal (HI)
Coaxial Coil
Terminal (M)
Common
Terminal(C)
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.
Natural Gas
Minimum: 4.5" w.c.
Maximum: 10.0" w.c.
Propane Gas
Minimum: 11.0" w.c.
Maximum: 13.0" w.c.
INLET GAS SUPPLY PRESSURE
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.
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
AS
M
ANIFOLD
P
RESSURE
M
EASUREMENT
AND
A
DJUSTMENT
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
Gas Line
To Furnace
Drip Leg Cap
With Fitting
Manometer Hose
Manometer
Open To
Atmosphere
Measuring Inlet Gas Pressure (Alt. Method)
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPMENT
DAMAGE
,
THE
GAS
MANIFOLD
PRESSURE
MUST
BE
AS
SPECIFIED
ON
THE
UNIT
RATING
PLATE
. O
NLY
MINOR
ADJUSTMENTS
SHOULD
BE
MADE
BY
ADJUSTING
THE
GAS
VALVE
PRESSURE
REGULATOR
.
CAUTION
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.
