Cooling Mode; Fan Only; Start-Up Procedure And Adjustment; Furnace Operation - Goodman GMH8 Installation Instructions Manual

• Furnace i s nowoperating in high-stage heating mode.
• RandWthermostat contacts open, c ompleting thecall f or
heat.
• induced draftblower i s de-energized following a fifteen
second postpurge.
• Circulator blower isde-energized following a heat o ffdelay
period (selectable 100or 150seconds; factory s etat150
seconds).
If thefurnace is operating inthelow-stage heating m ode
when thermostat contacts open, c irculator remains a tlow
heat s peed f ortheselected d elay offperiod.
Ifthefurnace i soperating inhigh-stage heating m ode when
the thermostat c ontacts open,the circulatorblower
remains athigh heat s peed f orthirty seconds. The circulator
blower thenswitches tolowheat s peed fortheremainder
ofthe selected h eatoffdelayperiod. F orexample, the
selected heat o ffdelay period i s 150 seconds. The circulator
blower o perates at highheat f or30seconds a ndat low
speed for150 - 30= 120 seconds.
• Furnace a waits t henextcall f romthermostat.
COOLING
MODE
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 contacts 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.
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 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.Xll. Start-up
Procedure and Adjustment
Xll. START-UP PROCEDURE AND ADJUSTMENT
Furnace must have a 115 VAC power supply properly connected
and grounded. Proper polarity must be maintained for correct
operation. An interlock switch prevents furnace operation if the
blower door is not in place. Keep the blower access door in place
except for inspection and maintenance.
This furnace is also equipped with a self-diagnosing electronic
control module. In the event a furnace component is not operating
properly, the control module LED will flash on and off in a factory-
programmed sequence, depending on the problem encountered.
This light can be viewed through the observation window in the
blower access door. Refer to the Troubleshooting Chart for further
explanation of the lighting codes.
Follow the start-up and adjustment items, refer to further
information in Section XIII, Operational Checks (see table of
contents, pages 2-3 for page number)..
FURNACE OPERATION
Purge gas lines of air prior to start-up. Do not purge lines into an
enclosed burner compartment.
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other approved
method. Verify that all required kits (propane gas, high altitude,
etc.) have been appropriately installed.
NOTE: An interlock switch prevents furnace operation if the blower
door is not in place. Keep the blower access doors in place
except for inspection and maintenance.
FURNACE START-UP
1. Close the manual gas shutoff valve external to the furnace.
2. Turn off the electrical power to the furnace.
3. Set the room thermostat to the lowest possible setting.
4. Remove the burner compartment door.
NOTE: This furnace is equipped with an ignition device which
automatically lights the burner. Do not try to light the burner by
hand.
5. White-Rodgers Model 36G54: Push the switch to the OFF
position.
6. Wait five minutes to clear out any gas. Then smell for gas,
including near the floor.
7. If gas can be smelled following the five minute waiting
period in Step 6, immediately follow the instructions on
Page 3 of this manual. If you do not smell gas after five
minutes:
White-Rodgers Model 36G54: Push the switch to the ON
position.
8. Replace the door on the front of the furnace.
9. Open the manual gas valve external to the furnace.
10. Turn on the electrical power supply to the furnace.
11. Set the room thermostat to the desired temperature.
NOTE: There is an approximate 30 second delay between
thermostat energizing and burner firing.
FURNACE SHUTDOWN
1. Set the thermostat to lowest setting.
2. Turn off the electrical power supply to the furnace.
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