Whirlpool WPIO-369B Instruction Manual download pdf (Page 28)

■ If the thermostat call is for low heat, the gas control valve and

induced draft blower will continue on low stage. If the call is

for high heat, the gas control valve and induced draft blower

will change to high stage.

■ Circulator blower is energized on heat speed following a fixed

30-second blower-on delay. The circulator blower requires

30 seconds to ramp up to full speed. Electronic air cleaner

terminal is energized with circulator blower.

■ Furnace is now operating on the specified stage called for by

the 2-stage thermostat.

■ Furnace runs, integrated control module monitors safety

circuits continuously.

■ If the 2-stage thermostat changes the call from low heat to

high heat, the integrated control module will immediately

switch the induced draft blower, gas control valve and

circulator blower to their high-stage settings.

■ If the 2-stage thermostat changes the call from high heat to

low heat, the integrated control module will immediately

switch the induced draft blower and gas control valve to their

low-stage settings. The circulator blower will remain on

high-heating speed for 30 seconds before switching to the

low-heat circulating speed.

■ R and W1 (or R and W1/W2) thermostat contacts open,

completing the call for heat.

■ Gas control valve closes, extinguishing flame.

■ Induced draft blower is de-energized following a 15-second

post purge. Humidifier terminal is de-energized.

■ Circulator blower continues running for the selected heat-off

delay period (90, 120, 150 or 180 seconds). The speed run

during this period depends on the last heat call provided by

the thermostat. If the last call for heat was a call for low heat,

the air circulator motor will run on low heat speed for the

duration of the heat-off delay period (90, 120, 150 or

180 seconds). If the last call for heat was a call for high heat,

the air circulating motor will run on the high heating speed for

30 seconds and then switch to the low-heating speed for the

balance of the heat-off delay period (60, 90, 120 or

150 seconds).

■ Circulator blower and electronic air cleaner terminals are de-

energized.

■ Circulator blower ramps down to Off during the 30 seconds

following the heat-off delay period.

■ Furnace awaits next call from thermostat.

Cooling Mode

The normal operational sequence in cooling mode is as follows:

■ R and Y1/G or Y2/G thermostat contacts close, initiating a

call for cool.

■ Integrated control module performs safety circuit checks.

■ Outdoor fan and compressor are energized to their

appropriate speeds.

■ Circulator blower is energized on the appropriate cool speed

at the level and time determined by the selected ramping

profile. Electronic air cleaner terminals are energized with

circulator blower.

■ Furnace circulator blower and outdoor cooling unit run their

appropriate speed; Integrated control module monitors safety

circuits continuously.

■ R and Y1/G or Y2/G thermostat contacts open, completing

the call for cool.

■ Outdoor fan and compressor are de-energized.

■ Circulator blower continues running during a cool-off delay

period. The Off delay time and airflow level are determined by

the selected ramping profile.

■ Electronic air cleaner terminal and circulator blower are

de-energized.

■ Furnace awaits next call from thermostat.

Fan Only Mode

The normal operational sequence in fan only mode is as follows:

■ R and G thermostat contacts close, initiating a call for fan.

■ Integrated control module performs safety circuit checks.

■ Circulator blower is energized on continuous fan speed (30%

of the furnace’s maximum airflow capability) following a

5-second delay. Electronic air cleaner terminal is energized.

■ Circulator blower runs; integrated control module monitors

safety circuits continuously.

■ R and G thermostat contacts open, completing the call for

fan.

■ Electronic air cleaner terminal and circulator blower are

de-energized.

■ Furnace awaits next call from thermostat.

Operational Checks

Burner Flame

The burner flames should be inspected with the burner

compartment door installed. Flames should be stable, soft and

blue (dust may cause orange tips but must not be yellow). The

flames must extend directly outward from the burner without

curling, floating or lifting off. Flames must not impinge on the

sides of the heat exchanger firing tubes.

Burner Flame

Check the burner flames for good adjustment, a stable, soft and

blue flame that is not curling, floating or lifting off.

SAFETY CIRCUIT DESCRIPTION

General

A number of circuits are employed to ensure proper furnace

operation. These circuits serve to control any potential safety

hazards and serve as inputs in the monitoring and diagnosis of

abnormal function. These circuits are continuously monitored

during furnace operation by the integrated control module.

Integrated Control Module

The integrated control module is an electronic device which, if a

potential safety concern is detected, will take the necessary

precautions and provide diagnostic information through an LED.

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Whirlpool WPIO-369B Instruction Manual Page 28

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