ISi North America AMV8 User Manual download pdf (Page 29)

INTEGRATED C ONTROL M ODULE

The integrated control module is an electronic device which

controls all furnace operations. Responding to the thermostat,

the module initiates and controls normal furnace operation, and

monitors and addresses all safety circuits. If a potential safety

concern is detected, the module will take the necessary

precautions and provide diagnostic information through an LED.

PRIMARY LIMIT

The primary limit control is located on the partition panel and

monitors heat exchanger compartment temperatures. It is an

automatic reset, temperature sensor. The limit guards against

the overheating as a resulting of insufficient air passing over the

heat exchanger.

AUXILIARY L IMIT

The auxiliary limit control is located either on or near the circulator

blower and monitors heat exchanger compartment temperatures.

The control is a temperature sensor. It guards against overheating

resulting from insufficient air passing over the heat exchanger.

ROLLOUT L IMITS

The rollout limit controls are mounted on the burner/manifold

assembly and monitor the burner flame. They are manual-reset,

temperature sensors. This limit guards against burner flames

not being properly drawn into the heat exchanger.

PRESSURE SWITCHES

The pressure switches are normally-open, negative air pressure-

activated switches. They monitor the airflow (combustion air and

flue products) through the heat exchanger via pressure taps located

on the induced draft blower. These switches guard against

insufficient airflow (combustion air and flue products) through the

heat exchanger.

FLAME SENSOR

The flame sensor is a probe mounted to the burner/manifold

assembly which uses the principle of flame rectification to

determine the presence or absence of flame.

XV. TROUBLESHOOTING

ELECTROSTATIC D ISCHARGE (ESD) PRECAUTIONS

NOTE: Discharge body’s static electricity before touching unit. An

electrostatic discharge can adversely affect electrical components.

Use the following precautions during furnace installation and

servicing to protect the integrated control module from damage.

By putting the furnace, the control, and the person at the same

electrostatic potential, these steps will help avoid exposing the

integrated control module to electrostatic discharge. This

procedure is applicable to both installed and uninstalled

(ungrounded) furnaces.

1. Disconnect all power to the furnace. Do not touch the

integrated control module or any wire connected to the

control prior to discharging your body’s electrostatic

charge to ground.

2. Firmly touch a clean, unpainted, metal surface of the

furnace away from 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 step 2 before touching control or wires.

4. Discharge your body to ground before removing a new

control from its container. Follow steps 1 through 3 if

installing the control on a furnace. Return any old or new

controls to their containers before touching any ungrounded

object.

DIAGNOSTIC C HART

Refer to the troubleshooting chart on the following pages for

assistance in determining the source of unit operational problems.

The red diagnostic LED blinks to assist in troubleshooting the

unit. The number of blinks refer to a specific code.

RESETTING F ROM L OCKOUT

Furnace lockout results when a furnace is unable to achieve

ignition after three attempts, or when it has lost flame five times

during a single call for heat. It is characterized by a non-functioning

furnace and a one flash diagnostic LED code from the red LED. If

the furnace is in “lockout”, it will (or can be) reset in any of the

following ways.

1. Automatic reset. The integrated control module will

automatically reset itself and attempt to resume normal

operations following a one hour lockout period.

2. Manual power interruption. Interrupt 115 volt power to the

furnace for 1 - 20 seconds.

3. Manual thermostat cycle. Lower the thermostat so that

there is no longer a call for heat for 1 -20 seconds then

reset to previous setting.

NOTE: If the condition which originally caused the lockout still

exists, the control will return to lockout. Refer to the Diagnostic

Chart for aid in determining the cause.

XVI. MAINTENANCE

WARNING

O AVOID ELECTRICAL SHOCK, INJURY OR DEATH, DISCONNECT ELECTRICAL

POWER BEFORE PERFORMING ANY MAINTENANCE. IF YOU MUST HANDLE THE

IGNITER, HANDLE WITH CARE.

OUCHING THE IGNITER ELEMENT WITH BARE

FINGERS, ROUGH HANDLING, OR VIBRATION COULD DAMAGE THE IGNITER

RESULTING IN PREMATURE FAILURE.

NLY A QUALIFIED SERVICER SHOULD

EVER HANDLE THE IGNITER.

ANNUAL INSPECTION

The furnace should be inspected by a qualified installer, or service

agency at least once per year. This check should be performed at

the beginning of the heating season. This will ensure that all

furnace components are in proper working order and that the

heating system functions appropriately. Pay particular attention to

the following items. Repair or service as necessary.

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ISi North America AMV8 User Manual Page 29

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