Reznor RA 140 Troubleshooting Guide download pdf (Page 34)

Form I-RA/D 140/235 (Version A), Page 34

General

Service

Reznor

used-oil-fired heaters have been designed and manufactured to

provide years of trouble free operation.

However, as with any type of mechanical equipment, it can malfunction.

For your safety, we suggest that if you are unfamiliar with servicing this

type of equipment, contact a qualified service person. The material con-

tained in this section is prepared to aid an experienced service person in

diagnosing and repairing Reznor Model RA/RAD used oil heaters.

How a Reznor

Model RA/RAD Used-

Oil-Fired Heater Operates

When service is necessary, it is always helpful to understand the operation

of the device being serviced. With this in mind, the following information

has been prepared. Because of the many unique features of the heater, we as

the designer and manufacturer believe that it will be worth your time to

read this information before beginning any service function.

The RA/RAD heaters differ from most residential and commercial oil fur-

naces and used oil heaters in that the oil pump meters the volume of oil

supplied to the burner. A constant volume of oil is delivered by the pump to

the burner regardless of the oil viscosity. Oil pressure at the outlet of the

pump will vary depending upon oil grade, the length and height of the sup-

ply line, and the oil temperature.

If a pressure in excess of 50 psi is experienced at the pump, a relief valve

will open and return the oil to the supply tank.

Oil pressure at the atomizing nozzle will vary from .25 psi to 4 psi depend-

ing on the type of oil being burned. Nozzle oil pressure is not critical be-

cause compressed air is used to atomize the oil.

The solenoid valve located adjacent to the burner housing performs two

tasks. The primary task is to prevent oil from flowing into the combustion

chamber due to oil expansion in the heater. The second task is to assist in

preventing oil from flowing backwards. Both the solenoid valve and the

pump motor are turned on and off by the ignition controller. The check

valve at the pump prevents backwards flow of oil in both the heater supply

line and the suction line to the pump.

To properly atomize the different types of used oil, the oil must be heated.

The oil flows through an aluminum heat exchanger (pre-heater) with a 300

watt heating element. This oil heater which is external to the burner pre-

heats the oil to approximately 175°F. A pair of 30 watt heating elements on

the fuel line and nozzle assembly within the burner maintain an oil atomiz-

ing temperature of 160°F. Temperature sensors prevent burner operation

until the proper temperatures are attained. Oil temperature is maintained

continuously as long as the electrical power is on to the heater.

Compressed air for atomizing the used oil is supplied by a piston-type com-

pressor mounted on the service tray. Model RA/RAD 140 and 235 heaters

require air pressure within a 9 to 12 psi range for proper oil atomization. To

General

Operation

Service Notes

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Reznor RA 140 Troubleshooting Guide Page 34

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