258919-UIM-B-0107
3
NOTE:
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
cannot 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.
COIL INSTALLATION
COIL INSTALLATIONCOIL INSTALLATION
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
DRAIN PAN EXTENSION INSTALLATIONDRAIN PAN EXTENSION INSTALLATION
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
SECTION IV: DUCT CONNECTIONSSECTION IV: DUCT CONNECTIONS
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.
SECTION V: CONDENSATE DRAIN
SECTION V: CONDENSATE DRAIN SECTION V: CONDENSATE DRAIN
SECTION V: CONDENSATE DRAIN
CONNECTIONS
CONNECTIONSCONNECTIONS
CONNECTIONS
All drain lines should be pitched away from unit drain pan and should be
no smaller than the coil drain connection.
Route the drain line so that it doesn’t interfere with accessibility to the
coil, furnace, air handling system or filter and will not be exposed to
freezing temperatures.
Instruct the owner that the evaporator coil drain pan should be
inspected and cleaned regularly to prevent odors and assure proper
drainage.
NOTE:
When the coil is installed in an attic or above a finished ceiling,
an auxiliary drain pan must be provided under the coil as is specified by
most local building codes.
Coils should be installed level or pitched slightly toward the drain end.
Suggested pitch should not exceed 1/4-inch per foot of coil.
If the coil is provided with a secondary drain it should be piped to a loca-
tion that will give the occupant a visual warning that the primary drain is
clogged. If the secondary drain is not used it must be capped.
COIL UNDER PRESSURE.
Relieve pressure by removing plug from piping connection. Coil
may have factory installed TXV or may require TXV to be added.
See outdoor unit documentation for correct TXV to be used. Refer
to coil nameplate for TXV identification for this unit.
FIGURE 4:
Horizontal Coil Installation
AIR
FLOW
SUPPLY
DUCTWORK
FLEXIBLE
CONNECTIONS
MINIMUM45°
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.
Avoid Double Trapping.
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