Reznor VR Unit Installation Manual User Manual
Page 38
Form I-VR, P/N 205202 R13, Page 37
FIGURE 34 - Remove Combustion
Air Restrictor Plate
FIGURE 35 -
Clean the
Blower
Wheel
Clean the blower
wheel using a
brush, low-
pressure compressed air, and an aerosol degreaser
or refrigerant coil cleaner. Be careful not to damage
the blower wheel. Replace the restrictor plate.
Combustion Air
Restrictor Plate
Blower
Wheel
5) Clean the blower wheel. Remove any dust, dirt and/or oily deposits.
Non-oily deposits can be removed with a small brush and low-pressure
compressed air. Be careful not to damage the blower wheel. Use an
aerosol degreaser (available in automotive stores) or a refrigerant coil
cleaner to clean oily deposits.
6) Clean the inside of the burner/control box. Remove any dirt/debris that
collected during normal operation and from the wheel-cleaning process.
Do not let any foreign material enter the main burner or collect on the spark
electrode assembly.
7) Clean and re-install the combustion air screen and restrictor plate. If
equipped with a combustion air inlet cover, clean and re-install it on the
heater.
8) Close the access panels. Restore the electric and the gas. Test fire the
heater and check for proper operation.
9.2.8 Main Burner
R
S
Excessive dirt buildup on and inside the concentric port rings on the
main burner could cause fuel gas to spill out of the back of the burner tube.
Fuel gas spilling out of the back of the burner tube will cause gas odor inside
the building, and if not corrected, could eventually cause a fire/explosion haz-
ard. To prevent fuel gas spilling from the back of the burner tube, clean the
main burner ports at least annually.
Instructions for Removing and Cleaning the Main Burner (requires Phil-
lips screwdriver, 1/4” nut driver, 1-1/8” open end wrench, a wire brush,
cleaning cloth, and an automotive-type aerosol degreaser or refrigerant
coil cleaner):
CAUTION: Use of
eye protection is
recommended.
1) Turn off or disconnect the main electric supply.
2) Open both the control and burner access panels.
3) Rotate the knob on the gas valve to the “OFF” position.
4) While supporting the front of the burner, remove the two screws that retain
the main burner (Refer to
FIGURE 36A). Remove the brass nut located at
the rear of the burner. Slide the burner toward the combustion chamber,
carefully manipulate, and remove the burner from the burner/control box.
5) Remove any soot deposits from the burner with a wire brush. (See
FIGURE 36B.) Clean between the port rings with an aerosol degreaser
and/or compressed air. Wipe the inside of the burner tube clean. (Cleaning
the burner with an aerosol degreaser is highly recommended as the
degreaser will retard future buildup of dirt.)