1-18
SERVICE AND MAINTENANCE
SERVICE OF THE FILTER
• Remove any dust adhering to the fi lter by using a vaccum cleaner or wash in lukewarm water (below 40°C) with
neutral cleaning detergent.
• Rinse the fi lter well and dry before placing it back onto the unit.
• Do not use gasoline, volatite substances or chemicals to clean the fi lter.
• 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. Alternatively, remove service panel for fi lter service.
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 different 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(iv) When charging R410A, ensure that only liquid is being withdrawn from the cylinder or can.
Normally, the R410A 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.
! CAUTION
• R410A must be charged as liquid. Usually R410A cylinder is equipped with a dip-pipe for liquid withdrawal. If there is
no dip-pipe, the cylinder should be inverted so as to withdraw liquid R410A from the valve.
• 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 R410A according to the amount recommended in the specifi cation.
Invert cylinder
without dip-pipe
Liquid
withdrawal
Dip-pipe
IM 1 5RTBR-1209(0)-EN.indd 18IM 1 5RTBR-1209(0)-EN.indd 18 1/14/10 11:37:52 AM1/14/10 11:37:52 AM
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