Reznor SFT Unit Installation Manual - Manual (Page 19)

Form RZ -NA-I-SFT, Page 18
Burner
Box Assembly
Locating
Pins (hidden)
Lift up and pull out on the burner
rack and manifold assembly
Burner Box Cover 1/4-20 Hex Nut
Static Pressure Tap
Manifold
Cover
Plate
Manifold
Seal Plate
SERVICE AND MAINTENANCE
WARNING: Should overheating occur, or the gas supply fail to shut off, shut off the manual gas valve
to the appliance before shutting off the electrical supply.
WARNING: Do not use this appliance if any part has been under water. Immediately call a qualified
service technician to inspect the appliance and replace any gas control which has been under water.
WARNING: If you turn off the power supply, turn off the gas. See Hazard Levels, page 2.
This unit will operate with a minimum of maintenance. To ensure long
life and satisfactory performance, a heater that is operated under nor-
mal 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 reassemble correctly to
ensure that no unsafe conditions are created. When re-lighting, always
follow the lighting 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, check the burner
ports at least annually and clean if necessary.
Maintenance Schedule
The following procedures should be carried out at least annually (See
Paragraphs 19-28.):
• Clean the fan blade, fan guard, and motor.
• Clean the heat exchanger both internally and exter-
nally.
• Check the burners for scale, dust, or lint accumulation.
• Check the vent/combustion air system for soundness.
Clean the screen in the vent terminal cap. Replace any
parts that do not appear sound.
• Check the wiring for any damaged wire. Replace
damaged wiring. (See Paragraph 11 for replacement
wiring requirements.)
NOTE: Use only factory-authorized
replacement parts.
19. 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. Open the access panel..
4. Disconnect the union on the outside of the unit and remove the gas
pipe from the inlet of the gas valve.
5. On the burner box end of the flexible hose, loosen the hose clamp.
Slide the hose off the collar.
6. Disconnect the silicone tubing from the static tap on the burner box
cover.
Figure 12 - Removing the burner/rack manifold assembly
(For clarity, the heater cabinet and other parts are not
illustrated; do not remove the burner box assembly from
the heater.)