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SEQUENCE OF OPERATION

Cooling System

The cooling system is a complete factory package utilizing an air-
cooled condenser. The compressor is hermetically-sealed and
base-mounted with rubber-insulated hold-down bolts.

Furnace compressors have internal protection. In the event there
is an abnormal rise in the temperature of the compressor, the
protector will open and cause the compressor to stop.

Cooling Sequence of Operation

When the thermostat calls for cooling, R is closed to G and Y.
See the wiring connection diagrams in “Troubleshooting.” This
action completes the low voltage control circuit, energizing the
compressor, condenser fan motor and blower motor.

Blower Delay—Cooling

The circulating air blower is controlled by a timing circuit in the
integrated blower/ignition control. Timings are not adjustable.
Blower “on” delay is 5 seconds after the compressor starts and
blower “off” timing is 90 seconds after the cooling system shuts
down.

System Performance

For maximum performance of the cooling system, operating
temperatures and pressure should be checked. Superheat
should be determined at Standard ARI test conditions of 82ºF
(27.8ºC) outdoor and 80ºF (26.7ºC) indoor dry bulb/67ºF (19.4ºC)
wet bulb. If superheat measured deviates from values found in
the Suction Superheat table, refrigerant charge should be
adjusted accordingly for maximum performance.

Heating System

With the proper thermostat and subbase, continuous blower
operation is possible by closing the R to G circuit. Cooling blower
delay is also functional in this mode.

Heating Sequence of operation

1. When the thermostat calls for heat, the combustion blower is

energized by the ignition control.

2. When the speed of the combustion blower reaches proper

RPM, the pressure switch closes, initiating the pre-purge
timing (30 seconds nominal).

3. When pre-purge has expired, the ignition control energizes

the gas control valve, the spark electrode and the flame
sensor. The igniter sparks for 10 seconds, and the flame
sensor senses that flame has been established. If the flame
sensor does not sense that flame has been established in the
10-second interval, the ignition control will de-energize the
gas control valve.

4. The ignition control is designed to repeat this “trial for

ignition” a total of three times. If, at the end of the third trial, a
flame still has not been established, the ignition control will
repeat the trial for ignition sequence 1 hour later. The 1-hour
retry is indefinite.

5. Thirty seconds (nominal) after the initial trial for ignition, the

circulation air blower will start.

6. When the thermostat is satisfied, the combustion blower and

gas control valve are de-energized. The circulating air blower
motor will continue to run for a short period after the
thermostat is satisfied.

Circulating Air Blower

Depending on the package unit model, the blower motor will be
either a multi-speed or variable-speed motor.

Multi-Speed Motor

The circulating air blower is controlled by a timing circuit in the
integrated blower/ignition control. Timings are not adjustable.

Cooling

Blower “on” delay is 30 seconds after call for cooling. Blower
“off” delay is 90 seconds after the cooling system shuts down.

Heating

Blower “on” delay is 30 seconds (nominal) after burner ignition.
Blower “off” delay is approximately 120 seconds after the
thermostat is satisfied.