Indoor Unit Troubleshooting - Amana AVZC18 Manual

SERVICING

INDOOR UNIT TROUBLESHOOTING

ACC-OUT
(Accessory)
ACC-IN
(Accessory)
FUSE
X3A
EEV
COIL
AUXILIARY ALARM SWITCH
The control is equipped with two Auxiliary Alarm terminals,
labeled TB4 and TB5, which are typically utilized in series
with a condensate switch but could also be used with com-
patible CO2 sensors or fire alarms.
The auxiliary alarm switch must be normally closed and
open when the alarm occurs. For example, a normally
closed condensate switch will open when the base pan's
water level reaches a particular level. The control will
respond by turning off the blower motor and displaying the
HIGH VOLTAGE !
D ALL
ISCONNECT POWER BEFORE SERVICING
M
ULTIPLE POWER SOURCES MAY BE PRESENT
TO DO SO MAY CAUSE PROPERTY DAMAGE
.
INJURY OR DEATH
A UXA LA R M
TB1
TB5 TB4 TB2
7seg
SEG2
7seg
SEG1
X15A X5A
THERMISTOR
PRESSURE SENSOR
WARNING
.
. F
AILURE
,
PERSONAL
C
C C
X8A
RX LED
CPU LED STATUS LED
Micro
Processor
INDOOR UNIT PCB
proper fault codes. If the switch is later detected closed
for 30 seconds, normal operation resumes and the error
message is removed. The switch is closed as part of the
default factory setting. The error will be maintained in the
equipment's fault history.
CIRCULATOR BLOWER
This air handler is equipped with a variable speed circulator
blower. This blower provides several automatically-adjusted
blower speeds. The Specification Sheet applicable to your
model provides an airflow table, showing the relationship
between airflow (CFM) and external static pressure (E.S.P.).
NOTE: Upon start up in communicating mode the circuit
board may display an "Ed" error. This is an indication that
the dip switches on the control board need to be configured
in accordance with the Electric Heating Airflow Table. Con-
figuring the dip switches and resetting power to the unit will
clear the error code.
R 2 1
R R 2 2 1 1
X13A
X12A
23