Reznor BE Unit Installation Manual - Manual (Page 27)

Form RZ-NA-I-FE/BE, Mfg P/N 98807, Rev 10, Page 26
40. Venter Motor
Remove dirt and grease from the motor housing. Power venter motor is
permanently lubricated.
The vent relay controls the venter motor. If the relay contacts fail to
close the venter motor will not run. If the relay contacts fail to open, the
venter motor will not shut off, preventing the combustion air pressure
switch from opening.
41. Operating Gas Valve
The gas valve requires no field maintenance except careful removal of
external dirt accumulation and checking of wiring connections. Instruc-
tions for testing pressure settings are in Paragraph 11.
WARNING: The operating valve is the prime
safety shutoff. All gas supply lines must be free of
dirt or scale before connecting to the unit to ensure
positive closure. See Hazard Levels, page 2.
42. Fan and Limit Controls
If it is determined that the fan or limit control needs replacing, use only
factory-authorized replacement parts that are designed for your heater.
Instructions for replacing fan or limit control:
1. Turn off the electric power and shut off the gas supply.
2. Remove the outer left side panel (left when facing the back of the
unit). Remove the access panel. (See Figure 38.)
3. Remove defective controls and install new controls in the same
mounting holes. Use only factory-authorized replacement parts.
4. Replace access panel and side panel.
5. Turn on the electric power and the gas supply.
6. Relight following the lighting instructions on the heater.
Figure 38 -
Access to
Controls
39. Vent System
Check the vent system at least once a year. Inspection should include
all joints, seams, and the vent cap. Replace any defective parts.
Remove
Control
Access
Panel
Fan
Control
Limit
Control
On blower models, remove the grease and dirt from the blower housing
and check the belt for wear and proper tension (See Paragraph 15.)
Lubricate if the motor has oil cups or grease fittings. The motor sup-
plied as standard has lifetime lubrication and sleeve bearings.
On blower models, check current draw to motor rating plate.
Fan Models: Follow these instructions for replacement of the fan
guard, fan motor or fan blades.
1. If the heater is installed, turn off the gas and disconnect the electric
power.
2. Remove the left outer side panel (left when facing the rear of the
unit). Disconnect the fan motor wires.
3. Depending on the date that the heater was manufactured, it will have
either a lower-half fan guard only, two-piece full fan guard, or a one-
piece full fan guard. If the unit has a two piece fan guard, remove the
tension mounted upper half fan guard and the four screws that hold the
lower half. If the unit has a one-piece fan guard, remove all of the screws
that retain the fan guard. Remove the assembled parts (the fan guard,
the motor and the fan blade).
4. Disassemble and replace whatever parts are needed and reassemble
using whatever part(s) are being replaced and the original parts. If the
fan guard is being replaced, it is important that the same hardware be
used for attaching the motor to the fan guard as was used with the
original guard. These screws are especially made to cut through the
coating on the fan guard to provide adequate grounding for the motor.
Position the assembly on the heater. Attach the fan guard at the center
mounts. (IMPORTANT: If replacing the fan guard, use the screws that
held the original fan guard. These specially designed screws will cut
through the coating on the fan guard to provide a ground for the fan
motor.)
Rotate the fan blade to check for adequate clearance. If adjustment is
required, loosen the mounting screws, re-position the fan guard, and
tighten the screws. Rotate the fan blade and re-check for adequate
clearance. Repeat this procedure until the assembly is positioned prop-
Figure 37 -
Proper Position
of the Fan Blade
on the Motor
Shaft
Fan Hub A
Fan
Motor
Be sure the fan
blade is in proper
position on the
shaft. Position the
fan as shown in
Figure 37 accord-
ing to the chart on
the right. Model Set Screw “A” Hub to
Size Torque In-Lbs Motor
25 80 + or - 10 1-1/4" (32mm)
50 80 + or - 10 3/8"(10mm)
75 80 + or - 10 1/8" (3mm)
100-125 120 + or - 10 2-1/2" (64mm)
165-400 150 + or - 10 2-1/2" (64mm)
erly.
5. If necessary, drill the required upper and lower fan guard mounting
holes. Attach the fan guard at all upper and lower mounting points
using either the screws removed or field-installed sheet metal screws.
6. Reconnect the fan motor wires and replace the outer side panel.
7. Restore power to the heater and turn on the gas. Light, following the
instructions on the lighting instruction plate. Check for proper opera-
tion.
38. Fan or Blower (cont'd)