SERVICING
29
The line pressure supplied to the gas valve must be within the
range specified below. The supply pressure can be measured
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
IS
CONN
E
CT
E
L
E
CT
RI
CAL PO
WER
AND
S
H
U
T OFF GA
S
SU
PPLY.
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.
2. 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
figures. Refer to
Measuring Gas Pressure: Single Stage
Valves
figure for single stage valve inlet pressure tap
connections.
NOTE:
At either location, a hose fitting must be installed prior
to making the hose connection.
NOTE:
Use apapter kit #0151K00000S to measure gas
pressure on White-Rodgers 36J22 gas valves.
.
Measuring Inlet Gas Pressure
(Alternate Method)
3. Turn ON the gas and electrical power 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
following table.
INLET GAS SUPPLY PRESSURE
Natural Gas
Minimum: 4.5" w.c.
Maximum: 10.0" w.c.
If supply pressure differs from above, make necessary
adjustments to pressure regulator, gas piping size, etc., and/
or consult with local gas utility.
WARNING
H
I
GH
V
OLTAG
E
D
IS
CONN
E
CT
ALL
E
L
E
CT
RI
CAL PO
WER
AND
S
H
U
T OFF GA
S
SU
PPLY B
E
FO
RE
SERVI
C
I
NG O
R
I
N
S
TALL
I
NG TH
IS
U
N
I
T.
M
U
LT
I
PL
E
PO
WER
S
O
UR
C
ES
M
AY B
E
P
RESE
NT.
F
A
I
L
URE
TO
DO
S
O
M
AY CA
USE
P
R
OP
ER
TY DA
M
AG
E
, P
ERS
ONAL
I
N
JUR
Y O
R
D
E
ATH.
5. Disconnect manometer after turning off gas at manual
shutoff valve. Reinstall plug before turning on gas to
furnace.
6. Turn OFF any unnecessary gas appliances started in step
3.
7. Turn on gas to furnace and check for leaks. If leaks are
found, repair and then reinstall burner compartment door.
8. Turn on electrical power and verify proper unit operation.
Gas Manifold Pressure Measurement and
Adjustment
T
O P
REVE
NT
U
N
RE
L
I
ABL
E
OP
ER
AT
I
ON O
R
EQUI
P
ME
NT DA
M
AG
E
, TH
E
GA
S
M
AN
I
FOLD P
RESSURE
MUS
T B
E
A
S
S
P
E
C
I
F
IE
D ON TH
E
U
N
I
T
R
AT
I
NG PLAT
E
.
O
NLY
MI
NO
R
AD
JUS
T
ME
NT
S
S
HO
U
LD B
E
M
AD
E
BY
AD
JUS
T
I
NG TH
E
GA
S
V
AL
VE
P
RESSURE
RE
G
U
LATO
R
.
CAUTION
NOTE:
Use apapter kit #0151K00000S to measure gas
pressure on White-Rodgers 36J22 gas valves.
Only small variations in gas pressure should be made by
adjusting 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.
WARNING
H
I
GH
V
OLTAG
E
D
IS
CONN
E
CT
ALL
E
L
E
CT
RI
CAL PO
WER
AND
S
H
U
T OFF GA
S
SU
PPLY
B
E
FO
RE
SERVI
C
I
NG O
R
I
N
S
TALL
I
NG.
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.
2. Connect a calibrated water manometer (or appropriate
gas pressure gauge) at the gas valve outlet pressure
tap. Refer to
Measuring Gas Pressure: Single Stage
Valves
figure for single stage valve outlet pressure tap
connections.
L
I
N
E
V
OLTAG
E
NO
W
P
RESE
NT
WARNING
