Trane MWD507 Installation & Operation Manual page 12

Unit Installation
Preparation and installation of air duct
Precautions
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Installation of the return air duct
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12
When designing the air duct, please design the air channel according to the external static
pressure of the unit. The resistance of the air channel is equal to the static pressure; otherwise,
the air volume may be too large or small, resulting in failure of unit operation;
Make sure that the distance between the indoor return air opening and air inlet of the heat
exchanger is greater than or equal to 1 m;
Rational design of the air duct may eliminate noise effectively;
Make the external static pressure balanced with the duct resistance by changing the rotating
speed of the fan or regulating the resistance of the air duct (e.g., by adjusting the air-out speed of
the diffuser);
An insulating layer should be provided to reduce energy loss during transmission and separation
of condensate water;
The return air duct and air outlet duct should be fi xed to the precast slab of the fl oor with iron
stands, and all joints of the air duct should be sealed with sealant;
The distance between the wall and return air duct or air outlet duct is greater than or equal to
150 mm.
When bottom return air is selected, fold a piece of canvas duct purchased or self-made, use it
as the transition joint between the return air opening and return air grille, make free regulation
depending on the height of the indoor ceiling, and prevent vibration of the ceiling during
operation of the unit.
When bottom return air is selected, prepare the return air duct, connect its one end to the return
air opening of the indoor unit with rivets, and another end to the return air grille, as shown in
following fi gures
Rear return air:
Air return plenum
Return air duct
Return air grille
Rear return air:
Connected
by rivets
Canvas duc
Canvas duct
Return air grille
Air return plenum
Connected
by rivets
AMS-SVX04A-EN