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SERVICE OF THE FILTER
ü
Remove any dust adhering to the fi lter by using a vacuum cleaner or wash in lukewarm water (below 40°C) with neutral
cleaning detergent.
ü
Rinse the fi lter well and dry before placing it back onto the unit.
ü
Do not use gasoline, volatite substances or chemicals to clean the fi lter.
ü
Clean the fi lter at least once every 2 weeks. Or more frequently if necessary.
Filter Position
The fi lters are mounted in front of the indoor heat exchanger.
Unit shown in the diagram is 5RT90BR. Other models shall follow the same method.
Remove fi lter cover for fi lter service.
For unit which is installed together with economizer kit, there is one additional fi lter which is mounted at the bottom
side of rain hood. Unit shown in the diagram is 5RT90BR + economizer kit (fi eld installed). Other models shall follow the
same method.
VACUUMING AND CHARGING
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 R410A exclusively. Using the same vacuum pump for diff erent refrigerants may damage
the vacuum pump or the unit.
(iii) The refrigerant should never be released directly into the environment.
(iv) When charging R410A, ensure that only liquid is being withdrawn from the cylinder or can.
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SERVICE AND MAINTENANCE
Alternatively, remove side panel for fi lter service.
Dip-pipe
Rain hood (fi eld installed)
Remove fi lter cover on the rain hood for fi lter
service.
Ensure the fi lter is placed properly and the fi lter cover is
fastened with screws tightly after the service to avoid water
leaking. If necessary, weather-proof sealant shall be applied
in order to ensure water-proof fi nishing on the fi lter cover
and rain hood.
Invert cylinder
without dip-pipe
Liquid
withdrawal
CAUTION
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