Service And Maintenance - McQuay ROOFTOP R08019034483 Installation Manual

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Table of Contents

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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.

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(iv) When charging R410A, ensure that only liquid is being withdrawn from the cylinder or can.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.

• 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.