Daikin ERQ, Service Manual

Page: 78 / 260

Installation and operation manual
68
EKE EKEQDCBV3
Option kit for combination of Daikin condensing units
with field supplied air handling units
4PW52446-1
O
PERATION AND DISPLAY SIGNALS
T
ROUBLESHOOTING
To set up the system and make trouble shooting possible, it is
required to connect the remote controller to the option kit.
Not a malfunction of the air conditioner
The system does not operate
■ The system does not restart immediately after the cooling/
heating is requested.
If the operation lamp lights, the system is in normal operating
condition.
It does not restart immediately because one of its safety devices
actuates to prevent the system from being overloaded. The
system will turn on again automatically after 3 minutes.
■ The system does not restart immediately after the power supply
is turned on.
Wait 1 minute until the micro computer is prepared for operation.
Trouble shooting
If one of the following malfunctions occurs, take the measures shown
below and contact your dealer.
The system must be repaired by a qualified service person.
■
If a safety device such as a fuse, a breaker, or an earth leakage
breaker frequently actuates, or ON/OFF switch does not
properly work.
Turn off the main power switch.
■ If the display , the unit number and the operation lamp
flash and the malfunction code appears;
Notify your dealer and report the malfunction code.
If the system does not operate properly, and none of the above
mentioned malfunctions is evident, investigate the system according
to the following procedures.
If the system does not operate at all
■ Check if there is a power failure.
Wait until power is restored. If power failure occurs during
operation, the system automatically restarts immediately after
the power supply recovers.
■
Check if the fuse has blown or breaker has been tripped.
Change the fuse or set the breaker.
If the system stops operating after operation is complete
■
Check if the air inlet or outlet of outdoor or air handling unit is
blocked by obstacles.
Remove the obstacle and make it well-ventilated.
■ Check if the air filter is clogged.
Ask a qualified service person to clean the air filter.
■
The error signal is given and the system stops.
If the error resets after 5-10 minutes, the unit safety device was
activated but the unit restarted after evaluation time.
If the error persists, contact your dealer.
If the system operates but it does not sufficiently cool/heat
■
Check if the air inlet or outlet of the air handling unit or the
outdoor unit is blocked with obstacles.
Remove the obstacle and make it well-ventilated.
■ Check if the air filter is clogged.
Ask a qualified service person to clean the air filter.
■
Check if the doors or the windows are open.
Shut doors or windows to prevent wind from coming in.
■ Check if direct sunlight enters the room.
Use curtains or blinds.
■
Check if there are too many inhabitants in the room.
Cooling effect decreases if heat gain of the room is too large.
■ Check if the heat source of the room is excessive.
Cooling effect decreases if heat gain of the room is too large.
The air handling unit is freezing up
■ The liquid thermistor (R2T) is not put on the coldest position and
part of the air handling unit is freezing up.
Thermistor must be put on the coldest position.
■
The thermistor has come loose.
The thermistor must be fixed.
■ The air handling unit fan is not operating continuously.
When the outdoor unit stops operating, the air handling unit fan
must continue operation to melt the ice that was accumulated
during outdoor unit operation.
Ensure that the air handling unit fan keeps operating.
In these cases, contact your dealer.
For EKEQF only
Output
C1/C2 error
signal
Error: open
Abnormal operation on
condenser or control system
Power failure
No error: closed
(relay activated)
Normal operation
T1/T2 is open: no error
detection anymore
C3/C4
operation
signal
Open Compressor not operating
Closed Compressor operating
C7/C8 fan
output
Open Fan off
Closed Fan on
C9/C10 defrost
output
Open No defrost operation
Closed Defrost operation
Input
C5/C6:
capacity step
0–10 V
Only necessary for field
setting 13(23)–0 = 01
0–10 V capacity control
(*)
(*) Refer to paragraph "Operation with 0–10 V capacity control" on page 67.
T1/T2
(†)
(†) See field setting 12(22)–5.
Open
No cooling/heating
requested
Closed Cooling/heating requested
For EKEQD only
Output
C1/C2 fan
output
Open Fan off
Closed Fan on
Input
T1/T2
(*)
(*) See field setting 12(22)–5.
Open
No cooling/heating
requested
Closed Cooling/heating requested
■ The fan of the air handling unit must operate before
cooling operation is required to the outdoor unit.
■
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.
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