Amana ACV9, AMV9 Furnace awaits next call from thermostat, Xvi. Operational Checks, Burner Flame

2. Firmly touch a clean, unpainted, metal surface of the furnaces near the control. Any tools held in a person’s hand during grounding will be discharged.

3. Service integrated control module or connecting wiring following the discharge process in step 2. Use caution not to recharge your body with static electricity; (i.e., do not move or shuffle your feet, do not touch ungrounded objects, etc.). If you come in contact with an ungrounded object, repeat

The pressure switches are normally-open (closed during opera- tion) negative air pressure-activated switches. They monitor the airflow (combustion air and flue products) through the heat ex- changer via pressure taps located on the induced draft blower and the coil front cover. These switches guard against insufficient air- flow (combustion air and flue products) through the heat exchanger and/or blocked condensate drain conditions.

sis of abnormal function. These circuits are continuously moni- tored 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 pre- cautions and provide diagnostic information through an LED.

PRIMARY LIMIT

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.

AUXILIARY LIMIT

The auxiliary limit controls are located on or near the circulator blower and monitors blower compartment temperatures. They are a normally-closed (electrically), manual-reset sensors. These lim- its guard against overheating as a result of insufficient conditioned air passing over the heat exchanger.

ROLLOUT LIMIT

The rollout limit controls are mounted on the burner/manifold as- sembly 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

•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

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appropriate speed, integrated control module monitors safety circuits continuously.

R and YLO/G or Y/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 terminals 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:

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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 (56% of high stage cooling) following a five (5) second delay. Electronic air cleaner terminals are energized.

•Circulator blower runs, integrated control module monitors safety circuits continuously.

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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 next call from thermostat. FLAME SENSOR

XVI. OPERATIONAL CHECKS	The flame sensor is a probe mounted to the burner/manifold as-
BURNER FLAME	sembly which uses the principle of flame rectification to determine
	the presence or absence of flame.
The burner flames should be inspected with the burner compart-	XVIII. TROUBLESHOOTING
ment door installed. A sight glass is provided for inspection pur-
poses. Flames should stable, quiet, soft, and blue (dust may	ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
cause orange tips but they must not be yellow). Flames should	NOTE: Discharge body’s static electricity before touching unit. An
extend directly outward from the burners without curling, floating, or
lifting off. Flames must not impinge on the sides of the heat ex-	electrostatic discharge can adversely affect electrical components.
changer firing tubes.	Use the following precautions during furnace installation and ser-
	vicing to protect the integrated control module from damage. By
	putting the furnace, the control, and the person at the same electro-
	static potential, these steps will help avoid exposing the integrated
	control module to electrostatic discharge. This procedure is appli-
	cable to both installed and uninstalled (ungrounded) furnaces.
Check the burner flames for:	1. Disconnect all power to the furnace. Do not touch the
	integrated control module or any wire connected to the control
1. Good adjustment
2. Stable, soft and blue	prior to discharging your body’s electrostatic charge to
3. Not curling, floating, or lifting off.
	ground.

Burner Flame

XVII. SAFETY CIRCUIT DESCRIPTION

GENERAL

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-

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