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SERVICING
39
WARNING
HIGH
VOLTAGE
D
I
S
CONNECT
ALL
ELECT
R
ICAL
POWE
R
AND
S
HUT
OFF
GA
S
S
UPPLY
BEFO
R
E
S
E
R
VICING
O
R
IN
S
TALLING
THI
S
UNIT.
M
ULTIPLE
POWE
R S
OU
R
CE
S
MAY
BE
P
R
E
S
ENT.
F
AILU
R
E
TO
DO
S
O
MAY
CAU
S
E
P
R
OPE
R
TY
DAMAGE,
PE
RS
ONAL
IN
J
U
R
Y
O
R
DEATH.
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.
Pressure Regulator
Adjustment
(Under Cap Screw)
Gas Valve
On/Off
Selector
Switch
INLET
OUTLET
Inlet Pressure
Tap
Outlet Pressure
Tap
White-Rodgers Model 36J22 (Single-Stage)
Gas Valve On/Off
Selector Switch
Inlet
Pressure
Tap
Pressure Regulator
(under cap screw)
Outlet
Pressure
Tap
Honeywell Model VR8215
WARNING
HIGH
VOLTAGE
D
I
S
CONNECT
ALL
ELECT
R
ICAL
POWE
R
AND
S
HUT
OFF
GA
S S
UPPLY
BEFO
R
E
S
E
R
VICING
O
R
IN
S
TALLING.
Gas
Rate
Range
Nominal
Propane Gas
High Stage 9.7 to 10.3" w.c. 10.0" w.c.
Manifold Gas Pressure
S-308 CHECKING HOT SURFACE IGNITOR
120V Mini Igniter Single Stage -
furnaces use a 120V
carbide mini igniter for ignition. (part# 20165703) or a
Silicon Nitride igniter (part# 0130F00008) The normal
operating temperature is approximately 2550°F - 2876°F.
D
I
S
CONNECT
ALL
POWE
R
BEFO
R
E
S
E
R
VICING.
WARNING
1. Remove burner compartment door to gain access to the
ignitor.
2. Ignitor cool - approximately 70 - 77°F.
3. Disconnect the ignitor from the Ignition Control.
4. Using an ohmmeter measure the resistance of the ignitor:
Mini Igniter : Carbide Mini Igniter should read between 30
to 300 ohms.
5. Reconnect ignitor.
120V Silicon Nitride Igniter
- furnaces with a 120V
silicone nitride igniter; The normal operating temperature
is approximately 2156°F-2678°F. At room temperature
the igniter ohm reading should be from 37-68 ohms.
L
INE
VOLTAGE
NOW
P
R
E
S
ENT
WARNING
6. After checking and/or replacing of hot surface ignitor,
reinstall burner compartment door and verify proper unit
operation.
S-309 CHECKING FOR FLASHBACK
Flashback will also cause burning in the burner venturi, but is
caused by the burning speed being greater than the gas-air
flow velocity coming from a burner port.
Flashback may occur at the moment of ignition, after a burner
heats up or when the burner turns off. The latter is known as
extinction pop.
Since the end results of flashback and delayed ignition can
be the same (burning in the burner venturi) a definite attempt
should be made to determine which has occurred.
If flashback should occur, check for the following:
1. Improper gas pressure - adjust to proper pressure (See
S-307 CHECKING GAS PRESSURE
)..
2. Check burner for proper alignment and/or replace burner.
3. Improper orifice size - check orifice for obstruction.