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Tools and Parts
Gather the required tools and parts before starting installation.
Read and follow the instructions provided with any tools listed
here.
Tools Needed
Torch
Tape measure
Flat-blade screwdriver
Parts Needed
Check local codes. Check the existing drain configuration before
purchasing parts.
Field-fabricated auxiliary drain pan (in some installations)
Parts Supplied
Evaporator coil may be provided as a separate coil or
mounted in a duct extension.
System Requirements
IMPORTANT:
The blower and duct system must be properly sized in order
to provide adequate cooling and heating performance. For
proper cooling operation, the airflow through the indoor coil
should be 350 to 450 CFM per ton of cooling capacity (or
350 to 450 CFM per 12,000 Btu/h) based on the rating of the
outdoor unit.
All air passing over the evaporator coil must be filtered.
Evaporator coils are matched to specific outdoor units to
obtain an ARI rating. The orifice installed on each evaporator
coil is chosen for the Btu/h capacity of the coil. The factory-
installed orifice size is stamped on the orifice body, and is
identified with a label on the orifice extension stub. The orifice
size must match the size called for on the refrigerant charging
table found on the outdoor unit. A selection of replacement
orifices is available from the distributor.
Location Requirements
When the evaporator coil is installed in an attic, above a finished
ceiling, or in any location where condensate overflow would
result in property damage, the installer must provide an auxiliary
drain pan in addition to the primary and secondary drains. The
auxiliary drain pan must be connected to a drainage system
separate from the primary condensate drain.
2
¹⁄₄" nut driver
¹³⁄₁₆" open end wrench
Level
Drain Requirements
All vertical mount models come from the factory with right
and left front drain connections.
Multiposition models come from the factory with right and left
front drain connections for vertical installations and left front
drain connections when installed in the horizontal position.
Minimum ¾" copper or PVC drain lines are recommended.
NOTE: Check local codes before connecting drain lines to an
existing drainage system.
A field-fabricated auxiliary drain pan, with a drainpipe to the
outside of the building, is required in all installations over a
finished living space or in any area that may be damaged by
overflow from the main drain pan. In some localities, local
codes may require an auxiliary drain pan for any horizontal
installation.
CAUTION
If secondary drain is not installed, the secondary access
must be plugged.
INSTALLATION INSTRUCTIONS
Inspect Shipment
Check the evaporator coil rating plate to confirm
specifications are as ordered.
Upon receipt of equipment, inspect it for possible shipping
damage. Examine the evaporator coil inside the carton if the
carton is damaged.
If damage is found, it should be noted on the carrier's freight
bill. Damage claims should be filed with the carrier
immediately. Claims of shortages should be filed with the
seller within 5 days.
NOTE: If any damages are discovered and reported to the carrier,
do not install the evaporator coil, because your claim may be
denied.
Install Upflow/Downflow Evaporator Coil
IMPORTANT:
The evaporator coil must be installed in the discharge
(supply) air of a gas unit.
NOTE: Do not install an evaporator coil in the return air, or
excessive condensation will occur within the unit.
Install the evaporator coil level with the drain connection to
ensure proper drainage.
To avoid damage to the plastic drain pan, minimum spacing
is required between the drain pan and a unit heat exchanger.
A minimum spacing of 2" (5.1 cm) is required for a gas unit.
See "Evaporator Coil Drain Pan Clearances."
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