Gas Control Valve - L.B.White Oval 80 HP Instrucciones Y Manual Del Propietario

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Air differential switch:

The air differential switch is a normally open, critical

safety device. See Fig. 20 for location. Its purpose is

to prove to the ignition control that there is a sufficient

difference in pressure within the burner box before the

ignition control sends power to open the gas control

valve.

FIG. 20

Its electrical contacts close based on the difference

between pressures between the air inlet and the

burner box compartment. If the switch does not close

after the fan motor starts, the igniter will not spark

nor will the gas control valve open. A rapid flash will

occur on the red fault diagnostic light. The ignition

control will lock-out for 60 seconds before another trial

attempt. After three (3) fail attempts, a 2-time flash

pattern will occur. The same will occur if the fan motor

does not start on a call for heat.

If the switch is already closed from a past ignition

trial, and stays closed prior to a call for heat, the fan

motor will not start, nor will the igniter spark or the

valve open. A rapid flash will occur on the red fault

diagnostic light. The ignition control will lock-out for 60

seconds before another trial attempt. After three (3)

fail attempts, a 1-time flash pattern will occur from the

red fault diagnostic light.

The air differential switch orifices should be free of

dirt. If cleaning is needed, use pressurized air:

• Remove the respective orifice from the switch.

• Hold up to light. If blocked, clean with air.

• Ensure the orifices are pushed back into the proper

location on the switch. See Fig. 21

• Green orifice into black stem

• Blue orifice into white stem on switch.

Oval 80 Radiant Tube Heaters

FIG. 21

To test the switch:

• Disconnect the pressure switch wiring at terminals

PSI and PSO of the ignition control.

• Route the wires so both are exterior of the burner

box when the burner box' access door is closed

and latched.

• Start the heater. As soon as the fan motor starts,

connect both air switch leads together.

• If the heater starts and operates normally, verify

the following:

o Pressure switch wire terminals at the ignition

control are tight and in good condition.

o No obstructions at air inlet