Installation Guide
32
leased within 5 seconds, the test mode will terminate
and the system will return to normal operation. Other-
wise, the test mode will continue uninterrupted.
7. After completion of the 5-minute timer or test mode ter-
mination, whichever is earlier, the system will return to
normal operation, either continuing an existing heat de-
mand or going to the idle state.
CAUTION
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
.
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.
INLET OUTLET
Gas Valve On/Off
Selector Switch
White-Rodgers Model 36J54 (Two-Stage)
Figure 43A
Inlet
Pressure
Boss
Low Fire
Regulator
Adjust
M
a
n
o
m
e
t
e
r
M
a
n
o
m
e
t
e
r
H
o
s
e
High Fire Regulator
Adjust
Regulator
Vent
Outlet
Pressure Boss
Open to
Atmosphere
O
n
/
O
f
f
S
w
i
t
c
h
H
i
g
h
F
i
r
e
C
o
i
l
T
e
r
m
i
n
a
l
(
H
I
)
C
o
a
x
i
a
l
C
o
i
l
T
e
r
m
i
n
a
l
(
M
)
Common
Terminal(C)
White-Rodgers Model 36J54 Connected to Manometer
Figure 43B
Gas Valve On/Off
Selector Switch
Regulator
Vent
High Fire
Regulator
Adjust
Low Fire
Regulator
Adjust
Honeywell Model VR9205 (Two-Stage)
Figure 44A
i
M
a
n
o
m
e
t
e
r
M
a
n
o
m
e
t
e
r
H
o
s
e
Common
Terminal(C)
High Fire Coil
Terminal (HI)
Low Fire Coil
Terminal (LO)
Inlet Pressure Tap
1/8 NPT
O
p
e
n
t
o
A
t
m
o
s
p
h
e
r
e
Honeywell Model VR9205 Connected to Manometer
Figure 44B
Outlet Pressure Tap
1/8 NPT
Figure 44C
1. Turn OFF gas to furnace at the manual gas shutoff valve
external to the furnace.
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. See Honeywell VR9205 gas
valve figure or White-Rodgers 36J54 gas valve figure for
location of inlet pressure tap.
NOTE: If measuring gas pressure at the drip leg or Honeywell
VR9205 gas valve, a field-supplied hose barb fitting must be
installed prior to making the hose connection. If using the inlet
pressure 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.