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Maintenance and service, 1 maintenance schedule, 2 maintenance procedures – Reznor B Unit Installation Manual User Manual

Page 33

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Form I-F/B, P/N 98126 R21, Page 33

10. Maintenance

and Service

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 sat-

isfactory performance, a heater that is operated under normal 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.
The following procedures should be carried out at least annually (See Paragraphs

10.2.1-10.2.10 for specific instructions.):

Clean all dirt and grease from the primary and secondary combustion air openings.

Fan Models - Clean the fan blade, fan guard, and motor.

Blower Models - Clean the blower, the belt guard, the inlet guard, and motor of all

dirt and grease. Check the blower belt for tension and wear. Replace a worn belt

that may fail before the next scheduled maintenance check. Check that setscrews

are tight to the shaft.

Check the gas valve to ensure that gas flow is being shutoff completely.

Clean the heat exchanger both internally and externally.

Check the pilot burner and main burners for scale, dust, or lint accumulation.

Clean as needed.

Check the vent system for soundness. Replace any parts that do not appear

sound.

Check the wiring for any damaged wire. Replace damaged wiring. (See the unit

wiring diagram for replacement wiring requirements.)

10.1 Maintenance

Schedule

10.2.1 Check Operating Gas Valve

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.

Carefully remove external dirt accumulation and check wiring connections.
The combination gas valve must be checked annually to ensure that the valve is shut-

ting off gas flow completely.
Instructions:
1) Locate the 1/8” FPT INLET pressure tap on the combination valve (FIGURE 35).

10.2 Maintenance

Procedures

Single-

Stage Valve

Two-Stage

Valve

1/8" INLET

Pressure Tap

1/8” Outlet

Pressure Tap

1/8" INLET

Pressure Tap

1/8” Outlet

Pressure Tap

FIGURE 35 - Gas Valve

2) With the manual valve turned off to prevent flow to the gas valve, connect a

manometer to the 1/8” inlet pressure tap in the valve.

NOTE: A manometer (fluid-

filled gauge) with an inches water column scale is recommended.

3) With the field-installed manual valve remaining closed, observe the manometer

for two to three minutes for an indication of gas pressure. No pressure should be

indicated on the manometer.

If the manometer indicates a gas pressure, the field-installed manual gas valve

must be replaced or repaired before the combination gas valve can be checked.

4) If the manometer does not indicate gas pressure, slowly open the field-installed

manual gas valve. After the manometer's indicated gas pressure has reached

equilibrium, close the manual shutoff valve. Observe the gas pressure. There

should be no loss of gas pressure on the manometer. If the manometer indicates

a loss of pressure, replace the combination gas valve before placing the heater in

operation.

NOTE: Operational pres-

sure settings and instruc-

tions for checking pressure

settings are in Paragraph

6.1.

NOTE: Use only

factory-authorized

replacement parts.

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