Table of Contents
Advertisement
Ductwork
Attaching Downflow Ductwork
to Roof Curb
Supply and return air flanges are provided on the roof curb
for easy duct installation. All duct work must be run and
attached to the curb before the unit is set into place. See
Figure 2 for duct connections.
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 recom-
mended 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.
Attaching Horizontal Ductwork to Unit
— All conditioned air ductwork should be insulated to
minimize heating and cooling duct losses. Use mini-
mum of 50mm of insulation with a vapor barrier. The
outside ductwork must be weather proofed between the
unit and the building.
— When attaching ductwork to a horizontal unit, provide a
flexible water tight connection to prevent noise trans-
mission from the unit to the ducts. The flexible connec-
tion must be indoors and molded out of heavy canvas.
Note: Do not draw the canvas taut between the solid
ducts. See Figure 1 for duct connections.
Condensate Drain Piping
A 3/4 inch male PVC condensate drain connection is
provided on the opposite side of the unit as the evaporator
section access panel on downflow units. On horizontal
units, the condensate drain connection is located on the
corner of the unit next to the evaporator section access
panel. See Figure 1. A trap should be installed and filled
with water before starting the unit to avoid air from being
drawn through. Follow local codes and standard piping
practices when running the drain line. Pitch the line
downward, away from the unit, and avoid long horizontal
runs. See Figure 4.
Figure 4
!
Do not use reducing fittings in the drain lines. The
condensate drain must be:
— Made of 3/4" pipe size.
— Pitched 2.1 mm per meter (1/4" per foot) to provide
free drainage to convenient drain system.
— Trapped
— Must not be connected to closed drain system.
9
Advertisement
Table of Contents
