Form RZ-NA-I-FT, Page 16
MAINTENANCE AND SERVICE
WARNING: If you turn off the power
supply, turn off the gas. See Hazard
Levels, page 1.
The material contained in the MAINTENANCE AND
SERVICE Section of this manual is designed to aid a
qualified service person in maintaining and servicing
this equipment. This unit will operate with a mini-
mum of maintenance. To ensure long life and satis-
factory performance, a heater that is operated under
normal conditions should be inspected and cleaned
at the start of each heating season. If the heater is
operating in an area where an unusual amount of dust
or soot or other impurities are present in the air, more
frequent maintenance is recommended.
When any service is completed, be careful to reas-
semble correctly to ensure that no unsafe conditions
are created. When re-lighting, always follow the light-
ing instructions on the heater.
WARNING: Excessive dirt buildup on and inside the burner ports
could cause fuel gas to spill out of the back of the burner tube causing
gas odor inside the building. If uncorrected, fuel spilling out of the
back of the burner tube could cause a fire or explosion. To prevent
fuel gas from spilling from the back of the burners, clean the burner
ports at least annually.
Maintenance Schedule
- The following procedures should be carried out at least annu-
ally (See Figure 12 and Paragraphs 22-32.):
•
Clean all dirt and grease from the primary and secondary combustion air openings
(vents in cabinet panels).
•
Clean the fan blade, fan guard, and motor.
•
Clean the heat exchanger both internally and externally.
•
Check the burners for scale, dust, or lint accumulation.
•
Check the vent system for soundness. Replace any parts that do not appear sound.
•
Check the wiring for any damaged wire. Replace damaged wiring. (See Paragraph 13
for replacement wiring requirements.)
NOTE: Use only factory-authorized replacement parts.
NOTE: If the heater has been changed so that the controls are on the left side (Paragraph 9), their locations will appear
inverted. On Sizes 60-300, the ignitor must still be toward the bottom of the heater with the flame sensor toward the top.
Pressure
Switch
Flue
Collar
Flame
Sensor
Limit Control
Location -
Sizes 100-300 Transformer
Limit Control Location -
Sizes 30-75 (located in the
heat exchanger compartment;
remove louvers to access)
Venter Motor
and Wheel Assy
Fan
Motor
Auxiliary Limit Control -
Sizes 250 & 300 (Remove
fan guard to access.)
Gas
Valve
Pressure Tap (for tubing
connection to the pressure switch)
Circuit Board (See LED
Codes on page 11 or 19.)
Ignitor
Burner/Manifold
Assembly
Flame
Rollout
Switch -
Sizes
30-60
Figure 12 - Location of Controls - View of the
Control Compartment (A Size 30 is illustrated;
locations are approximately the same for other
sizes but may appear out of proportion.)
22. Burner Removal
Instructions for Burner Removal (See Figure 12)
1.
Shut the gas supply off ahead of the combination valve.
2.
Turn off electric supply.
3.
Remove the access panel; the vertical burner assembly is visible on the left side of the heater.
4.
Open the union in the gas line before the gas valve.
5.
Disconnect the flame sensor wire and the ignitor wire.
6.
Remove the screws that attach the burner assembly to the front panel and inner wall. Pull the manifold/burner assembly out of the heater.
Clean the Burners (requires a wire brush, cleaning cloth, and an automotive type aerosol
degreaser or refrigerant coil cleaner)
CAUTION: Use of eye protection is recommended.