Maytag Amana M9S80-U Series, Руководство по установке

Страница: 24 / 36

24
.

Checking Static Pressure
(80% Furnace Shown)
Figure 13
Safety Circuit Description
General
T
O AVOID PERSONAL INJURY OR DEATH
,
DO NOT REMOVE ANY
INTERNAL COMPARTMENT COVERS OR ATTEMPT ANY ADJUSTMENT
.
E
LECTRICAL COMPONENTS ARE CONTAINED IN BOTH COMPARTMENTS
.
C
ONTACT A QUALIFIED SERVICE AGENT AT ONCE IF AN ABNORMAL
OPERATION SHOULD DEVELOP
.
WARNING
WARNING
DO NOT BYPASS SAFETY DEVICES
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 diagnosis of abnormal function. These circuits are contin-
uously monitored during furnace operation by the integrated
control module.
Integrated Control Module
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 neces-
sary 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 a
normally closed (electrically), automatic reset, temperature
activated sensor. The limit guards against the overheating
resulting from insufficient air passing over the heat exchanger.
Auxiliary Limit
The auxiliary limit control is located either on or near the
circulator blower and monitors heat exchanger compartment
temperatures. The control is a normally closed (electrically),
automatic reset, temperature activated sensor. It guards
against overheating resulting from insufficient air passing
over the heat exchanger. The auxiliary limit control is suitable
for both horizontal right and horizontal left installations.
Regardless of airflow direction, it does not need to be
relocated.
Burner Temperature Switch
The burner temperature switch is mounted on the burner
assembly to monitor the burner box temperature. It is normally
closed (electrically), auto-reset sensor. This switch guards
agianst the burner flames not being properly drawn into the
heat exchanger.
Pressure Sensor
The pressure sensor is mounted near induced draft blower.
Its function is to regulate the induced draft blower’s speed in
order to maintain proper air-fuel ratio for clean and reliable
combustion. The pressure sensor also guards agianst
insufficient airflow (combustion air and flue products) through
the heat exchanger.
Flame Sensor
The flame sensor is a probe mounted near the burner
assembly which uses the principle of flame rectification to
determine the presence or absence of flame.
Troubleshooting
Diagnostic Chart
Refer to the troubleshooting chart in the Appendix for
assistance in determining the source of unit operational
problems. The 3 digit diagnostic display provides alarm codes
to assist in troubleshooting the unit.
Fault Code Retrieval
The ignition control is equipped with push buttons that can be
used to the last five faults detected by the control. Navigate
the L6F by pressing the menu button 2 times, then select the
option button.
Clear Fault Memory
To clear all alarm codes, navigate to the last six faults menu,
L6F, and hold the option button down for 5 seconds.
Resetting From Lockout
Furnace lockout results when a furnace is unable to achieve
ignition after three attempts. It is characterized by a non-
functioning furnace and a fault code will be displayed . 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 120 volt power to
the furnace.