Reznor RPB Unit Installation Manual - Manual (Page 34)

Form I-RPB, P/N 131782 R11, Page 34
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.
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.
8.3 Burners and
Carryover
System
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.
Natural gas burner racks (except when equipped with electronic modulation Option
AG39 or AG40; see Paragraph 8.1.4) are equipped with two flash carryovers. 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
orifices for cleanliness.
8.4 Burner Air
Adjustment
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.
When making the adjustment, close the air shutters no more than is necessary to elimi-
nate the problem condition.
DANGER
Failure to install and/or adjust air shutters according to directions
could cause property damage, personal injury, and or death.
9.0 Check
Installation and
Startup
9.1 Check the installation prior to startup:
 Be certain the electrical supply matches voltage rating of the furnace. (Refer to the
rating plate.)
 Check all field wiring against the wiring diagram. Be sure that wire gauges are as
required for the electrical load.
 Be certain that the electrical entrances are sealed against the weather.
 Check that fuses or circuit breakers are in place and sized correctly.
 Verify that the condensate drain holes in the corners of the cabinet are open.
 Check clearances from combustibles. Requirements are shown in Paragraph 4.2.
 Check piping for leaks and proper gas line pressure. Bleed gas lines of trapped air.
See Paragraph 6.1.
a) Turn manual shutoff valve to off position.
b) Turn gas supply on.
c) Observe gas meter for movement, or
d) Attach pressure gauge readable to .1" w.c. and after turning gas on for ten
seconds, turn gas supply off. No change in pressure should occur over a three-
minute period.
8.0 Controls
(cont'd)
8.2 Pilot and
Ignition
Systems
(cont'd)