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SERVICING
TROUBLESHOOTING-INDOOR UNIT FOR EEV APPLICABLE UNIT
A
A
S
UXILIARY
LARM
WITCH
The control is equipped with two Auxiliary Alarm terminals, la-
beled TB4 and TB5, which are typically utilized in series with a
condensate switch but could also be used with compatible CO
sensors or fire alarms.
TB5
ALARM
TB4
The auxiliary alarm switch must be normally closed and open
when the alarm occurs. For example, a normally closed conden-
sate switch will open when the base pan's water level reaches a
particular level. The control will respond by turning off the blower
46
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
INDOOR UNIT CONTROL BOARD
SWITCH
WARNING
.
. F
AILURE
,
PERSONAL
motor and displaying the 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
2
default factory setting. The error will be maintained in the
equipment's fault history.
C
B
IRCULATOR
LOWER
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.).
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Troubleshooting
