Troubleshooting-Indoor Unit - Daikin DZ18VC Service Instructions Manual

SERVICING

TROUBLESHOOTING-INDOOR UNIT

ACC-OUT
TB5
(Accessory)
ACC-IN
(Accessory)
FUSE
X3A
EEV
COIL
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
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
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
TB4 TB2
7seg
SEG2
7seg
SEG1
X5A
X15A
PRESSURE SENSOR THERMISTOR
SWITCH
WARNING
.
. F
AILURE
,
PERSONAL
X8A
RX LED
STATUS LED
CPU LED
Micro
Processor
INDOOR UNIT PCB
default factory setting. The error will be maintained in the
equipment's fault history.
C B
IRCULATOR LOWER
2
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.).
For heater kit installation, it is important to set the capacity
of the electric heater at two locations.
Set-up Menu
("HT KIT(kW)") of thermostat CONFIGURATION menu of the
ComfortNet tm systems Advanced feature Menus.
[REMOVED EMERGENCY MODE DIPSWITCH INFORMATION]
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 accor-
dance with the Electric Heating Airflow Table. Configuring the dip
switches and resetting power to the unit will clear the error code.
C R 2 1
C C R R 2 2 1 1
X13A
X12A
51