Refrigerant Piping Work; Test Operation; Operation And Maintenance; What To Do Before Operation - Daikin ERQ Series Service Manual

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.
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.
R
EFRIGERANT PIPING WORK
All field piping must be provided by a licensed refrigeration
technician and must comply with the relevant local and
national codes.
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:
Refer to the section of "For the following items, take special care
during construction and check after installation is finished" on
page 89.
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 Close the contact T1/T2 (ON/OFF).
2 Confirm function of the unit according to the manual and check if
the air handling unit has collected ice (freeze-up).
If the unit collects ice: see "Troubleshooting" on page 96.
3 Confirm that the fan of the air handling unit is ON.
EKEQMCBV3
Option kit for combination of Daikin condensing units
with field supplied air handling units
4PW52447-1
In case of poor distribution in the air handling unit, 1 or
more passes of the air handling unit may freeze-up
(collect ice) put the thermistor (R2T) on this
position.
Depending on operation conditions (e.g.: outdoor
ambient temperature) it is possible that the settings
must be changed after commissioning.
O
PERATION AND MAINTENANCE
If T1/T2 is applicable:
Closing the T1/T2 signal starts operation of the air handling unit.
Opening the T1/T2 signal stops operation of the air handling
unit.
W
HAT TO DO BEFORE OPERATION
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 air handling unit (field supply).
Make sure that the air handling unit fan is ON when
the outdoor unit is in normal operation.
Field settings for EKEQMCB
Refer to the installation manuals of both the outdoor unit and the
remote controller.
Operation setting in case of power failure
Measures must be taken to ensure that after power failure,
T1/T2 is according to the setting of your preference.
Neglecting this caution will result in improper operation.
Mode No. Code No.
01
22(12)–5
02
(*) After power failure, T1/T2 must be changed to open (no cooling/heating
requested).
O
PERATION AND DISPLAY SIGNALS
Open
Input (*)
T1/T2
Closed
(*) See field setting 22(12)–5.
See the remote controller display for output.
NOTE
See optional kit KRP4A51 for additional possible
signals.
When the operation signal is activated, the air handling unit
and fan must operate. Failure to this will cause a safety to
operate or freezing up of the air handling unit.
Description of setting
T1/T2 must be open at power
(*)
restore.
After power failure, the status of
T1/T2 must remain identical to the
initial T1/T2 status prior to the power
failure.
No cooling/heating requested
Cooling/heating requested
Installation and operation manual
95