900590-UIM-B-0613
3
COIL INSTALLATION
These horizontal coils are designed for installation with a horizontal
(gas or oil fired) furnace or modular blower. A minimum 45° transition
must be field fabricated to allow proper air distribution through the coil.
Airflow direction must be as shown in Figure 4.
Connect ductwork/transition only to coil duct flanges. DO NOT drill
holes in coil cabinet.
DRAIN PAN EXTENSION INSTALLATION
These coils are shipped with a drain pan extension fastened to the air
leaving side duct flanges. Drain pan extension must be removed.
Install
coil and refasten the extension to the air leaving side of the coil drain
pan as shown in Figure 5, before completing ductwork. The extension
will extend into the duct work as shown.
SECTION IV: DUCT CONNECTIONS
This coil is suited for horizontal applications only.
The vast majority of problems encountered with combination heating
and cooling systems can be linked to improperly designed or installed
duct systems. It is therefore highly important to the success of an instal-
lation that the duct system be properly designed and installed.
Use flexible duct collars to minimize the transmission of vibration/noise
into the conditioned space.
Where return air duct is short, or where sound may to be a problem,
sound absorbing glass fiber should be used inside the duct. Insulation
of duct work is a must where it runs through an unheated space during
the heating season or through an uncooled space during the cooling
season. The use of a vapor barrier is recommended to prevent absorp-
tion of moisture from the surrounding air into the insulation. The supply
air duct should be properly sized by use of a transition to match unit
opening. All ducts should be suspended using flexible hangers and
never fastened directly to the structure. Duct work should be fabricated
and installed in accordance with local and/or national codes. This
includes the standards of the National Fire Protection Association for
Installation of Air Conditioning and Ventilating Systems, NFPA No. 90B.
FIGURE 3: Proper Bulb Location
COIL UNDER PRESSURE.
Relieve pressure by depressing schrader core. Coil may have factory
installed TXV or may require TXV to be added. See outdoor unit doc-
umentation for correct TXV to be used. Refer to coil nameplate for
TXV identification for this unit.
The coil should be open to the air for no more than 2 minutes to keep
moisture and contaminates from entering the system. If the coil can-
not be brazed into the refrigeration system in that time, the ends
should be temporarily closed or plugged. For a short term delay, use
masking tape over the ends of the copper tubing to close the tube to
the air. For a longer term delay, use plugs or caps. There is no need
to purge the coil if this procedure is followed.
TXV BULB
(Cover completely
with insulation)
SCREW
CLAMP
NUT
SUCTION HEADER
SUCTION LINE
(FIELD INSTALLED)
FIGURE 4: Horizontal Coil Installation
AIR
FLOW
SUPPLY
DUCTWORK
FLEXIBLE
CONNECTIONS
MINIMUM 45°
TRANSITION
FIGURE 5: Drain Pan Extension Installation
AIR FLOW
COIL
DUCTWORK
DETAIL “A”
DUCTWORK
DRAIN PAN
EXTENSION
“S” CLIP
FASTENERS
(3)
COIL FLANGES
FOR DUCTWORK
FASTENING
DRAIN PAN
Use 1/2" screws to connect ductwork to unit. If pilot holes are drilled,
drill only through field duct and unit flange.
Equipment should never be operated without filters.
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