
9
I&O manual
I&O manual
Attaching horizontal ductwork to unit
All conditioned air ductwork should be insulated to minimize
heating and cooling duct losses. Use a minimum of two (2)
inches of insulation with a vapor barrier. The outside ductwork
must be weatherproofed between the unit and the building.
When attaching ductwork to a horizontal unit, provide a flexible
watertight connection to prevent noise transmission from the
unit to the ducts. The flexible connection must be indoors and
made out of heavy canvas.
Attaching downflow ductwork to roof curb
Supply and return air flanges are provided on the roof curb for
easy duct installation. All ductwork must be run and attached to
the curb before the unit is set into place.
Follow these guidelines for ductwork construction:
Connections to the unit should be made with three-inch canvas
connectors to minimize noise and vibration transmission.
Elbows with turning vanes or splitters are recommended to
minimize air noise and resistance.
The first elbow in the ductwork leaving the unit should be no
closer than two feet from the unit, to minimize noise and
resistance.
5.4 Condensate drain piping
5.5 Ductwork
Do not draw the canvas taut between the solid ducts.
Drain connection hole
Drain outlet
Snap ring
Drain pipe
≥ 40mm
Unit
Field duct
Air proof this seam
Fig.5-7
Fig.5-8
Fig.5-6
Unit exterior
Unit duct flance
Weather proof
this seam
Field duct
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For ground level installations, the unit should be positioned on
a pad in the size of the unit or larger. The unit must be level on
the pad. The pad must not come in contact with the structure.
Be sure the outdoor portion of the supply and return air ducts
are as short as possible.
Proceed with the installation as follows:
Place the unit on the pad.
Attach the supply and return air ducts to the unit.
Insulate any ductwork outside of the structure with at least 2
inches of insulation and weatherproof. There must be a weath-
erproof seal where the duct enters the structure.
Complete the installation according to the instructions in the
following sections of this manual.
5.3 Ground level-horizontal units
Typical ground level application
Fig.5-5
NOTE
Содержание RC060RTRGA
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