Whirlpool WGFD293 Instruction Manual download pdf (Page 40)

■ 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

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.

Primary Limit Control

The primary limit control is located on the partition panel and

monitors heat exchanger compartment temperatures. It is a

normally closed (electrically), automatic reset, temperature-

activated sensor. The limit guards against overheating as a result

of insufficient conditioned air passing over the heat exchanger.

Auxiliary Limit Controls

The auxiliary limit controls are located on or near the circulator

blower and monitors blower compartment temperatures. They

are normally-closed (electrically), manual-reset sensors. These

limits guard against overheating as a result of insufficient

conditioned air passing over the heat exchanger.

Rollout Limit Controls

The rollout limit controls are mounted on the burner/manifold

assembly and monitor the burner flame. They are normally-

closed (electrically), manual-reset sensors. These limits guard

against burner flames not being properly drawn into the heat

exchanger.

Pressure Switches

The pressure switches are normally-open (closed during

operation), negative air pressure-activated switches. They

monitor the airflow (combustion air and flue products) through

the heat exchanger via pressure taps located on the induced

draft blower and the coil front cover. These switches guard

against insufficient airflow (combustion air and flue products)

through the heat exchanger and/or blocked condensate drain

conditions.

Flame Sensor

The flame sensor is a probe mounted on the burner/manifold

assembly which uses the principle of flame rectification to

determine the presence or absence of flame.

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 51 52

Comments to this Manuals

No comments

Whirlpool WGFD293 Instruction Manual Page 40

Comments to this Manuals

Related products and manuals for Fireplaces Whirlpool WGFD293