Daikin UAT180AMY1 Manuel D'installation page 18

The rooftop package units are factory pre-charged with suffi cient refrigerant. However, there may be a need for charge recovery
during service and maintenance works. Therefore, some precautions must be taken to ensure optimum and trouble-free system
operation:
(i) The system should be throughly vacuumed to ensure no incompressible gas and moisture in the system.
(ii) Use a vacuum pump for R22 or R407C exclusively. Using the same vacuum pump for different refrigerants may damage
the vacuum pump or the unit.
(iii) The refrigerant should never be released directly into the environment.
(iv) When charging R407C, ensure that only liquid is being withdrawn from the cylinder or can.
Normally, the R407C cylinder or can is being equipped with a dip-pipe for liquid withdrawal. However, if the dip-pipe is
not available, invert the cylinder or can so as to withdraw liquid from the valve at the bottom.
• Do not top-up when servicing leak, as this will reduce the unit performance. Vacuum the unit thoroughly and then
charge the unit with fresh R22 & R407C according to the amount recommended in the specifi cation.
If any malfunction of the air conditioner unit is noted for some simple trouble-shooting tips. Check the following
fault conditions and causes for some simple troubleshooting tips. For any enquiries on spare part, please contact you
authorized dealer.
Problem
Unit does not run.
Compressor does not operate in
3 min after unit has started.
Air fl ow is low.
Compressor operate continuously.
No cool air delivered during
cooling cycle, or no hot air
delivered during heating cycle.
On heating cycle, indoor fan stop
suddenly.
UAT(Y)(P)180,240,280,320
On heating cycle, delivered air does
not warm enough suddenly.
UAT(Y)(P)450,500,700,850
If the fault persists, please call your authorized local dealer/serviceman.
VACUUMING AND CHARGING
Dip-pipe
TROUBLESHOOTING
Power failure.
Fuse blown or circuit breaker tripped.
Power supply wiring phase incorrect.
Protection against frequent starting.
Filter is fi lled with dust and dirt.
There are some obstacles at the air inlet or
outlet of the units.
Dirty air fi lter.
Temperature setting is too low (for cooling).
Temperature setting is too high (for heating).
Temperature setting is too high (for cooling).
Temperature setting is too low (for heating).
Unit is in defrosting cycle.
Invert cylinder
without dip-pipe
Liquid
withdrawal
! CAUTION
Causes
12
Action
Press the [ON/OFF] after power restore.
Replace fuse or reset circuit breaker.
Modify the wiring phase.
Wait for 3 min for the compressor to
start.
Clean the fi lter.
Remove obstacles.
Clean the air fi lter.
Reset the temperature.
Set the temperature lower.
Set the temperature higher.
Wait for a while.
(It will be resumed after defrosting.)