Specifications
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2. Duct Construction.
(1) Series MRT side ow units are equipped with horizontal supply
and return air openings. Duct connection to the unit should be
made with duct anges and secured directly to the air openings
with exible duct connectors to avoid normal noise transmission.
(2) For vertical air supply, a eld supply plenum should be used.
The gure shows the recommended method for duct connection.
(3) To prevent air leakage, all duct seams should be taped. Duct
runs in air spaces that are not air-conditioned must be insulated
and provided with a vapor barrier.
Ducts exposed outdoors must be weather proofed. For quiet
operation, we recommend that the insulation on the supply duct be
placed inside, lining the duct.
(4) Where ducts from outdoors enter a building, the duct openings
in the building should be sealed with weather stripping to prevent
rain, dirt, sand, etc. from entering the building.
(5) Correctly sized lters must be tted. There is no provision within
the unit for the placement of lter. However, the lters may be
installed in the return air chamber.
(6) Duct earth wiring must be connected. Please refer to the
section “Outlines and dimensions” for the correct position.
Duct connection with
a vertical air plenum
Duct connection at
MRT down flow unit
at MRT side flow unit
MRT side flow unit
MRT down flow unit
Optional Feature (Down Flow)*
Series MRT down ow units are equipped with vertical supply and
return air openings. Duct connection to the unit should be made with
duct anges to avoid normal noise transmission.
When connecting duct earth wiring for down ow conguration, we
must use accessory screw attached on the control box cover.
* Site modication required. Please refer to item 6:
OPTIONAL FEATURES for details.
Duct connection with
a vertical air plenum
Duct connection at
MRT down flow unit
at MRT side flow unit
MRT side flow unit
MRT down flow unit