Reznor RA 140 Troubleshooting Guide download pdf (Page 35)

Form I-RA/D 140/235 (Version A), Mfg No. 110318 Rev 3, Page 35

assure that the correct atomizing air pressure is available, a pressure switch

permits oil flow to the nozzle only when a minimum of 9 psi is sensed.

Combustion air is supplied by a blower contained in the burner housing. An

adjustable air shutter and air band located on the outside of the burner hous-

ing control the quantity of combustion air. Both are preset at the factory and

should be changed only if the CO

measurement indicates the need to do so.

See Check-Test-Start, for instructions for measuring CO

Ignition of the atomized oil and combustion air mixture is accomplished by

a high voltage spark across the two electrodes located near the atomizing

nozzle. Ignition of the oil is detected by a cadmium sulfide flame sensor.

Light produced by the flame lowers the electrical resistance of the cad cell.

This change is sensed by the ignition controller which allows a continued

flow of oil and shuts off the spark transformer after a 30-second trial-for-

ignition period.

If for some reason, ignition does not occur or the flame goes out during the

trial period, the primary control will lockout. To restart, the safety switch

must be manually reset by pushing the red reset button on the ignition con-

trol. Depress and hold the reset button for three seconds. If the heater does

not ignite, contact your service person.

If the instructions in this manual are followed, excessive amounts of un-

burned oil will not accumulate inside the combustion chamber. If the cau-

tion statement about resetting the controller more than one time is not heeded,

then unburned oil will accumulate in the combustion chamber. If unburned

oil accumulates, DO NOT attempt to fire the heater and burn off the oil.

Remove the combustion chamber access panels as described in Mainte-

nance Section, “Inspecting and Removing Soot and Ash from the Combus-

tion Chamber/Heat Exchanger”. Wipe out any accumulated oil with cloth

rags. Properly dispose of the rags.

If the flame fails during normal operation, the heater will go into lockout

requiring manual reset of the primary controller. Depress and hold the reset

button for three seconds. If the heater does not ignite, contact your service

person.

If power fails, the heater will shut down and normal trial for ignition will

begin on call for heat when the power is restored.

Approximately 1-1/2 to 2 minutes after the thermostat calls for heat and

ignition is established, the circulating fans or blowers will come on. The

circulating airflow will continue about three minutes after the burner shuts

down.

General

Operation

Continued

CAUTION: Do not

reset the primary

control more than one

time. If the heater

does not ignite,

contact your service

person.

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Reznor RA 140 Troubleshooting Guide Page 35

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