Amana AMV9, ACV9 installation instructions Xv. Normal Sequence Of Operation

motor to reset and recognize new speed selection. Turn on power to furnace. Verify selected CFM by counting the green CFM LED blinks.

In general lower heating speeds will: reduce electrical consump- tion, lower operating sound levels of the blower, and increase the outlet air temperature delivered to the home. The speeds avail- able allow the blower performance to be optimized for the particu- lar homeowner’s needs.

BLOWER HEAT OFF DELAY TIMINGS

The integrated control module provides a selectable heat off delay function. The heat off delay period may be set to 90, 120, 150, 180 seconds using the DIP switches or jumper provided on the control module. The delay is factory shipped at 150 seconds but may be changed to suit the installation requirements and/or homeowner preference. Refer to the following figures for switch positions and corresponding delay times.

	3	Heat Off
ON	2	Delay
		90 Seconds
ON	1
		Heat Off
	3
ON	2	Delay
OFF	1	120 Seconds
		Heat Off *
	3
OFF	2	Delay
ON	1	150 Seconds
		Heat Off
	3
OFF	2	Delay
OFF	1	180 Seconds

Heat Off Delay

(* indicates factory setting)

Heat Off Delay Switches

XV. NORMAL SEQUENCE OF OPERATION

POWER UP

The normal power up sequence is as follows:

•115 VAC power applied to furnace.

•Integrated control module performs internal checks.

•Integrated control module flashes LED one time.

•Integrated control module monitors safety circuits continuously.

•Furnace awaits call from thermostat.

HEATING MODE

The normal operational sequence in heating mode is as follows:

•R and W1 (or R and W1/W2) thermostat contacts close, initiating a call for heat.

•Integrated control module performs safety circuit checks.

•Induced draft blower is energized on high speed for a 10- second prepurge. Humidifier terminals are energized with induced draft blower.

•Induced draft blower steps to low speed following prepurge. Low stage pressure switch contacts are closed.

•Igniter warm up begins upon step to low speed and presence of closed low stage pressure switch contacts.

•Gas valve opens at end of igniter warm up period, delivering gas to burners and establishing flame.

•Integrated control module monitors flame presence. Gas valve will remain open only if flame is detected.

•If the thermostat call is for low heat, gas valve and induced draft blower will continue on low stage. If the call is for high heat, the gas valve and induced draft blower will change to high stage.

•Circulator blower is energized on heat speed following a fixed thirty second blower on delay. The circulator blower requires thirty (30) seconds to ramp up to full speed. Electronic air cleaner terminals are energized with circulator blower.

•Furnace is now operating on the specified stage called for by the two-stage thermostat.

•Furnace runs, integrated control module monitors safety circuits continuously.

•If the two-stage thermostat changes the call from low heat to high heat, the integrated control module will immediately switch the induced draft blower, gas valve, and circulator blower to their high stage settings.

•If the two-stage thermostat changes the call from high heat to low heat, the control will immediately switch the induced draft blower and gas valve to their low stage settings. The circulator blower will remain on high heating speed for thirty

(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 valve closes, extinguishing flame.

•Induced draft blower is de-energized following a fifteen second post purge. Humidifier terminals are 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 thirty (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 YLO/G or Y/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 speed.

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