Reznor VR Unit Installation Manual User Manual

Page 39

Form I-VR, P/N 205202 R13, Page 38

First, remove these two

screws.

Then, supporting the

front of the burner,

remove the brass nut at

the other end.

Remove burner.

Brass Nut

FIGURE 36A - Open the

Burner Compartment and

Remove the Burner

The spark electrode assembly performs several necessary functions, and

to ensure reliable service, it must be cleaned periodically. The required fre-

quency of cleaning will vary depending on the installation site and the hours of

operation. No less than annual cleaning is recommended.
One of the most important reasons for cleaning the spark electrode assembly

is that the DC current needed to prove the burner must flow through the elec-

trode. That current can either be retarded or totally blocked by deposits and/or

corrosion on the electrode.
Instructions for Removing and Cleaning the Spark Electrode Assembly

(requires phillips screwdriver, 1/4” nut driver, and emery cloth):
1) Turn off or disconnect the main electric supply.
2) Open the control access panel. Rotate the knob on the gas valve to the

“OFF” position. At the ignition controller, disconnect the high voltage spark

electrode wire.

3) Open the burner access panel. Remove the screws and the spark

electrode assembly (Refer to

FIGURES 37A and 37B).

4) Use an emery cloth to clean the two metal rods on the spark electrode.

Clean until they are bright. Wipe off the ceramic insulator.

5) The spark gap must be maintained to 1/8” as illustrated in

FIGURE 37C.

6) Re-assemble, reversing above procedure. Test the heater for proper

operation.

9.2.9 Spark

Electrode Assembly

CAUTION: Due to

high voltage on

the spark wire and

electrode, do not

touch when ener-

gized. See Hazard

Levels, page 2.

FIGURE 36B -

Burner Removed for

Cleaning

9.2.8 Main Burner (cont’d)

9. Maintenance

(cont’d)

9.2 Maintenance Procedures (cont’d)

6) Inspect the cleaned burner for any damage or

deterioration. If the burner has any damage

or signs of deterioration, replace it. Carefully

reverse the above procedures to re-install or

replace the burner.

Test the heater for proper operation.