Piping Installation; Precautions For Piping Installation - McQuay MDS 30 Installation Manual


Ensure that the wall is strong enough to withstand the weight of the unit. Otherwise, it is necessary to
reinforce the wall with plates, beams or pillars.

Use the level gauge for horizontal mounting and fix it with 4 suitable screws.

In case the rear piping draws out, drill a hole 65mm in diameter with a cone drill, slightly lower on the outside
wall.

The indoor drain pipe must be in a downward gradient for smooth drainage. Avoid situations that are likely to
cause water to leak.

Hook the indoor unit onto the upper portion of the installation plate (engage the two hooks at the rear top of
the indoor unit with the upper edge of the installation plate).

Ensure that the hooks are properly seated on the installation plate by moving it to the left and right.

6.0 Piping Installation

MDS system is a "one outdoor unit coupled with many indoor units" system. For piping connection, there are gas
pipe and liquid pipe connection with flare joint.

6.1 Precautions for piping installation


Check and ensure the thickness, diameter and cleanliness of the copper tube is within specification.

It is not allowed to vacuum the system with refrigerant.

Do not use any detergent to clean the refrigerant piping.

Seal the outlet of the copper tube to avoid dust, dirt or water from entering.

Do not install the copper pipe during rainy day.

Avoid bending and turning of piping. Special tools must be used to bend the piping.

Use the right equipment for brazing the copper tube.

All copper tube must be insulated to ensure heat exchange efficiency and to avoid water from condensing.

The outdoor ball valve should remain closed until the completion of leakage test and vacuum process.

Ensure the unit is properly charged with the correct amount of refrigerant.
Installation Manual IM-MDS_(i) 13