Daikin LRMEQ3BY1, Installation And Operation Manual

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13 Troubleshooting
Installation and operation manual
29
4BY1
Air-cooled refrigeration condensing unit
4P495373-1 – 2017.07
WARNING
▪ Do not modify, disassemble, remove, reinstall or repair
the unit yourself as incorrect dismantling or installation
may cause an electric shock or fire. Contact your
dealer.
▪ In case of accidental refrigerant leaks, make sure there
are no naked flames. The refrigerant itself is entirely
safe, non-toxic and non-combustible, but it will
generate toxic gas when it accidentally leaks into a
room where combustible air from fan heaters, gas
cookers, etc. is present. Always have qualified service
personnel confirm that the point of leakage has been
repaired or corrected before resuming operation.
13 Troubleshooting
If system malfunctions are likely to degrade the articles in the room/
showcase, you can ask your installer to install an alarm (example:
lamp). For more information, contact your installer.
If one of the following malfunctions occur, take the measures shown
below and contact your dealer.
WARNING
Stop operation and shut off the power if anything
unusual occurs (burning smells etc.).
Leaving the unit running under such circumstances may
cause breakage, electric shock or fire. Contact your dealer.
The system must be repaired by a qualified service person:
Malfunction Measure
If a safety device such as a fuse, a
breaker or an earth leakage breaker
frequently actuates or the ON/OFF
switch does not properly work. Turn off the main power
switch.
If water leaks from the unit. Stop the operation.
The operation switch does not work
well. Turn off the power.
If the system does not properly operate except for the above
mentioned cases and none of the above mentioned malfunctions is
evident, investigate the system according to the following
procedures.
Malfunction Measure
If the system does not
operate at all. ▪ Check if there is no power failure. Wait
until power is restored. If power failure
occurs during operation, the system
automatically restarts immediately after
power is restored.
▪ Check if no fuse has blown or breaker is
activated. Change the fuse or reset the
breaker if necessary.
The system stops
immediately after
starting operation. ▪ Check if air inlet or outlet of outdoor or
indoor unit is not blocked by obstacles.
Remove any obstacles and make sure
the air can flow freely.
Malfunction Measure
The system operates
but cooling is
insufficient. ▪ Check if air inlet or outlet of outdoor or
indoor unit is not blocked by obstacles.
Remove any obstacles and make sure
the air can flow freely.
▪ Check if the indoor unit is not frosted up.
Defrost the unit manually, or shorten the
defrost operation cycle.
▪ Check if there are not too many articles
inside the room/showcase. Remove a
couple of articles.
▪ Check if there is smooth air circulation
inside the room/showcase. Reorganise
the articles inside the room/showcase.
▪ Check if there is not too much dust on
the outdoor unit heat exchanger.
Remove the dust with a brush or vacuum
cleaner,
without using water. If
necessary, consult your dealer.
▪ Check if there is cold air leaking outside
of the room/showcase. Stop the air from
leaking outside.
▪ Check if you did not set the indoor unit
setpoint temperature too high. Set the
setpoint appropriately.
▪ Check if there are no high-temperature
articles stored in the room/showcase.
Always store articles after they have
cooled down.
▪ Check if the door is not opened too long.
Reduce the opening time of the door.
If after checking all above items, it is impossible to fix the problem
yourself, contact your installer and state the symptoms, the complete
model name of the unit (with manufacturing number if possible) and
the installation date (possibly listed on the warranty card).
13.1 Symptoms that are NOT system
malfunctions
The following symptoms are NOT system malfunctions:
13.1.1 Symptom: The system does not operate
▪ The system does not start immediately after it is turned ON again.
If the operation lamp lights, the system is in normal condition. To
prevent overloading of the compressor motor, the system starts 5
minutes after it is turned ON again in case it was turned OFF just
before.
▪ The system does not start immediately after the power supply is
turned on. Wait one minute until the micro computer is prepared
for operation.
13.1.2 Symptom: The unit does not stop
immediately when operation is stopped
This is to prevent components from being damaged. The unit will
stop in a little while.
13.1.3 Symptom: Noise (Outdoor unit)
▪ A continuous low hissing sound is heard when the system is in
cooling operation. This is the sound of refrigerant gas flowing
through both indoor and outdoor units.
▪ A hissing sound which is heard at the start or immediately after
stopping operation. This is the noise of refrigerant caused by flow
stop or flow change.