Cooling Mode; Fan Only Mode; Operational Checks; Burner Flame - Goodman GMH95 Installation Instructions Manual

C M
OOLING ODE
The normal operational sequence in cooling mode is as follows:
•
R and Y thermostat contacts close, initiating a call for cool.
•
Integrated control module performs safety circuit checks.
•
Outdoor fan and compressor are energized.
•
Circulator blower is energized on cool speed following a
fixed five second on delay. Electronic air cleaner terminals
are energized with circulator blower.
•
Furnace circulator blower and outdoor cooling unit run,
integrated control module monitors safety circuits
continuously.
•
R and Y thermostat contact open, completing the call for
cool.
•
Outdoor fan and compressor are de-energized.
•
Circulator blower is de-energized following a fixed forty five
second cool off delay period. Electronic air cleaner terminals
are de-energized.
•
Furnace awaits the next call from thermostat.
F O M
AN NLY ODE
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 low heat speed. Electronic
air cleaner terminals are energized.
•
Circulator blower runs, integrated control module monitors
safety circuits continuously.
•
R and G thermostat contacts open, completing the call for
fan.
•
Circulator blower is de-energized. Electronic air cleaner
terminals are de-energized.
•
Furnace awaits the next call from thermostat.
XVI. OPERATI XVI. OPERA XVI. OPERA XVI. OPERA XVI. OPERA
B F
URNER LAME
The burner flames should be inspected with the burner compart-
ment door installed. A sight glass is provided for inspection pur-
poses. Flames should be stable, quiet, soft, and blue (dust may
cause orange tips but they must not be yellow). Flames should
extend directly outward from the burners without curling, floating, or
lifting off. Flames must not impinge on the sides of the heat ex-
changer firing tubes.
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.

Burner Flame

TIO O O O O NAL CHECK TI TI TI NAL CHECKS S S S S NAL CHECK NAL CHECK NAL CHECK

XVII. SAFETY CIRCUIT DESCRIPTION

XVII. SAFETY CIRCUIT DESCRIPTION
XVII. SAFETY CIRCUIT DESCRIPTION XVII. SAFETY CIRCUIT DESCRIPTION XVII. SAFETY CIRCUIT DESCRIPTION
G
ENERAL
A number of safety circuits are employed to ensure safe and proper
furnace operation. These circuits serve to control any potential
safety hazards and serve as inputs in the monitoring and diagno-
sis of abnormal function. These circuits are continuously moni-
tored during furnace operation by the integrated control module.
I C M
NTEGRATED ONTROL
The integrated control module is an electronic device which, if a
potential safety concern is detected, the module will take the nec-
essary precautions and provide diagnostic information through an
LED.
P L
RIMARY IMIT
The primary limit control is located on the partition panel and moni-
tors heat exchanger compartment temperatures. It is a normally-
closed (electrically), automatic reset, temperature-activated sen-
sor. The limit guards against the overheating as a result of insuffi-
cient conditioned air passing over the heat exchanger.
A L
UXILIARY IMIT
The auxiliary limit control(s) are located on or near the circulator
blower and monitors heat exchanger compartment temperatures.
They are a normally-closed (electrically), manual-reset, tempera-
ture activated sensors. These limits guard against overheating as
a result of insufficient conditioned air passing over the heat ex-
changer.
R L
OLLOUT IMIT
The rollout limit control(s) are mounted on the burner/manifold
assembly and monitor the burner flame. They are normally-closed
(electrically), manual-reset, temperature-activated sensors. These
limits guard against burner flames not being properly drawn into
the heat exchanger.
P S
RESSURE WITCHES
The pressure switches are normally-open (closed during opera-
tion), single-pole single-throw, negative air pressure-activated
switches. They monitor the airflow (combustion air and flue prod-
ucts) 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 con-
ditions.
F S
LAME ENSOR
The flame sensor is a probe mounted to the burner/manifold as-
sembly which uses the principle of flame rectification to determine
the presence or absence of flame.
31
ODULE