EKEXMCBV3
Option kit for combination of Daikin condensing units
with field supplied evaporators
4PW32096-1
Installation and operation manual
8
Installation of longer thermistor cable (R1T/R2T/R3T)
The thermistor is supplied with a standard cable of 2.5 m. This cable
can be made longer to up to 20 m.
Install the longer thermistor cable with the delivered wire to wire
splices
1
Cut the wire or bundle the remainder of the thermistor cable.
Keep at least 1 m of the original thermistor cable.
Do not bundle the cable inside the control box.
2
Strip the wire ±7 mm at both ends and insert these ends into the
wire to wire splice.
3
Pinch the splice with the correct crimp tool (pliers).
4
After connection, heat up the shrink-insulation of the wire to wire
splice with a shrink-heater to make a water tight connection.
5
Wrap electrical insulation tape around the connection.
6
Put a pull-relief in front of and behind the connection.
R
EFRIGERANT
PIPING
WORK
■
For refrigerant piping of outdoor unit, refer to the installation
manual supplied with the outdoor unit.
■
Follow the outdoor unit specifications for additional charging,
piping diameter and installation.
■
The maximum allowed piping length depends on the connected
outdoor model.
T
EST
OPERATION
Before executing "test operation" as well as before operating the unit,
you must check the following:
■
Put the evaporator fan on minimum airflow.
■
Refer to the section of
"For the following items, take special care
during construction and check after installation is finished" on
page 3
■
After finishing the construction of refrigerant piping, drain piping
and electric wiring, conduct test operation accordingly to protect
the unit.
■
Open the gas side stop valve.
■
Open the liquid side stop valve.
Executing the test operation
1.
Start the evaporator fan operation.
2.
Close the contact T1/T2 (ON/OFF).
3.
Confirm function of the unit according to the manual and check if
the evaporator has collected ice (freeze-up).
■
If the unit collects ice: see
O
PERATION
AND
MAINTENANCE
W
HAT
TO
DO
BEFORE
OPERATION
Field settings for EKEXMCB
Refer to the installation manuals of both the outdoor unit and the
remote controller.
Operation setting in case of power failure
O
PERATION
AND
DISPLAY
SIGNALS
■
The connection must be made on an accessible
location.
■
To make the connection waterproof, the connection
can also be made in a switch box or connector box.
■
The thermistor cable should be located at least
50 mm away from power supply wire. Not following
this guideline may result in malfunction due to
electrical noise.
All field piping must be provided by a licensed refrigeration
technician and must comply with the relevant local and
national codes.
■
In case of poor distribution in the evaporator, 1 or
more passes of the evaporator may freeze-up (collect
ice)
➞
put the thermistor (R2T) on this position.
■
Make sure that the evaporator fan keeps operating,
even when the outdoor unit compressor stopped
operating (only at the moment of "anti-freeze-up"
control).
■
Depending on operation conditions (e.g.: outdoor
ambient temperature) it is possible that the settings
must be changed after commissioning.
■
Before initiating operation, contact your dealer to get
the operation manual that corresponds to your
system.
■
Refer to the dedicated manual of the controller (field
supply) and evaporator (field supply).
■
Make sure that the air handling unit fan is ON when
the outdoor unit is operating.
Measures must be taken to ensure that after power failure,
the T1/T2 operation signal is according to the setting of
your preference. Neglecting this caution will result in
improper operation.
Mode No.
Code No.
Description of setting
12(22)–5
01
The T1/T2 operation signal contact
must be open at power restore.
(*)
(*)
After power failure, the T1/T2 operation signal contact must be changed to open
(no cooling requested).
02
After power failure, the status of the
T1/T2 operation signal contact
(operation request) must remain
identical to the initial T1/T2 contact
status prior to the power failure.
Input
T1/T2 operation
input
(*)
(*)
See field setting 12(22)–5.
Open
No cooling requested
Closed
Cooling requested
NOTE
■
See the remote controller display for output.
■
See optional kit KRP4A51 for additional possible
signals.
■
The fan of the evaporator must operate before cooling
operation is required to the outdoor unit.
■
When the operation signal is activated, the evaporator
and fan must operate. Failure to this will cause a
safety to operate or freezing up of the evaporator (air
handling unit).
