Reznor X Unit Installation Manual - Manual (Page 22)

Form I-X, P/N 150491 R10, Page 22
CAUTION: Due to high voltage on pilot spark wire and pilot electrode, do
not touch when energized. See Hazard Levels, page 2.
If no spark occurs, check the following:
a) Voltage between Terminals TH and 7 should be at least 20 volts and no higher
than 32 volts. Refer to Troubleshooting (Paragraph 10.3) if no voltage is observed.
b) Short to ground in the high tension lead and/or ceramic insulator.
c) Pilot spark gap should be approximately 7/64".
NOTE: When checking
for spark with the pilot
burner assembly removed
from the burner rack, the
pilot assembly must be
grounded to the heater for
proper spark.
FIGURE 23 - Spark Pilot
-- Maintain a spark gap
of 7/64"
Flame Sensing Probe
Pilot
Orifice
Centerline of
first burner
High Tension
Lead
Burner
Rack
Front
Spark Electrode
Spark Gap
7/64” (2.78mm)
TOP VIEW OF BURNER
TOP VIEW
SIDE
VIEW OF
PILOT
1/4”± 1/32”
(6.38mm±.79)
23/32”
(18.25mm)
7/16”± 1/16”(11mm±1.6)
If the above conditions are normal and no spark occurs, replace the ignition controller.
If the main gas valve fails to open with a normal full size pilot flame established, check
for the following:
a) Voltage between black and brown leads on the main gas valve is 20 to 32 VAC
and there is no main gas flow with the built-in manual valve in FULL OPEN
position -- the main valve is defective.
b) No voltage between black and brown leads on the main gas valve -- check for
disconnected or shorted flame sensor lead or flame sensor probe.
When the above conditions are normal and the main gas flow is still off, the ignition
controller is probably defective.
NOTE: Model X furnaces manufactured prior to 10/2003 may be equipped with a
match-lit pilot.
8.6.1 Burner Carryover
These duct furnaces have individually formed steel burners with accurately die-formed
ports to give controlled flame stability without lifting or flashback with either natural or
propane gas. The burners are lightweight and factory mounted in an assembly which
permits them to be removed as a unit for inspection or service.
All natural gas burners are equipped with two flash carryover systems that receive
a supply of gas simultaneously with the main burner. All propane gas burners are
equipped with one flash carryover and a regulated gas lighter tube system. During
regular service, check the main burner ports, the carryover assemblies, and the ori-
fices for cleanliness.
8.6.2 Burner Air
Adjustment
8.6 Burner
Carryover
System and Air
Adjustment
8.0 Controls
(cont'd)
Burner air shutters are not normally required on natural gas furnaces. Air shutters are
required on propane gas units and may require adjustment.
Before making any adjustments to the air shutters, allow the heater to operate for
about fifteen minutes with the air shutters open. The slotted screw on the end manifold
bracket moves the air shutters and adjusts all burners simultaneously. Turning the
screw clockwise opens the shutters; counterclockwise closes the shutters. After the
furnace has been in operation for 15 minutes, close the air shutters observing the flame
for yellow-tipping. Open the shutters until the yellow disappears. A limited amount of
yellow-tipping is permissible for liquefied petroleum gases. Natural gas should not dis-
play any yellow-tipping.
8.5 Pilot and
Ignition
Systems
(cont'd)