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Cooling Mode; Fan Only Mode; Operational Checks; Safety Circuit Description - Whirlpool WGFM29 Installation Instructions Manual

93% and 95% 2-stage variable-speed gas furnace
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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.

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.
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