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Reznor VR Unit Installation Manual User Manual

Page 38

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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.)