CONDENSATE DRAIN
The unit is supplied with 3/4” primary and auxiliary
condensate drains. Both drains must be trapped
outside the unit and piped in accordance with
applicable building codes. Do not reduce the drain line
size less than the connection size on the drain pan.
Condensate should be piped to an open drain or to the
outside. All drains must pitch downward away from the
unit a minimum of 1/8” per foot of line to ensure proper
drainage.
REFRIGERANT PIPING
Refrigerant piping external to the unit shall be sized in
accordance with the instructions of the manufacturer of
the outdoor equipment.
METERING DEVICE
All units are shipped with a checkow piston or thermal
expansion valve installed, which is designed for air
conditioning or heat pump operation. If your application
requires a thermal expansion valve or check expansion
valve and the unit is ordered with a piston, then it is
necessary to remove the piston from the distributor
assembly and install the proper metering device. Be
sure to follow the instruction in the kit to ensure proper
installation.
BLOWER
This unit is supplied with a multi-speed motor with a
direct drive blower wheel which can obtain various air
ows. As an option, ECM X-13 motor is available. This
motor provides variable speeds, at a constant torque,
with a brush-less DC motor. The unit is shipped with
the blower connected for high speed. If a lower blower
speed is required. Disconnect all power to the unit,
remove the black indoor fan motor lead from the fan
relay, place an insulated cap on the black lead, remove
the insulated cap from the red indoor fan motor lead,
place a spade connector on the lead, and connect it
to the fan relay where the black lead was originally
connected. Be sure to check the air ow and the
temperature drop across the evaporator coil to ensure
that you have sufcient air ow.
WIRING
Consult all schematic and pictorial wiring diagrams of
this unit and the outdoor equipment to determine
SL* / BL* Series Air Handler Installation Guide Page 2
UNPACKING
Carefully unpack the unit and inspect the contents for
damage. If any damage is found at the time of delivery,
proper notication and claims should be made with the carrier
who delivered the unit.
Check the unit rating plate to ensure model number and
voltage, plus any kits agree with what you ordered. The
supplier should be notied immediately of any discrepancy
or parts shortage.
LOCATION
The blower coil unit should be centrally located. The unit
may be installed in an attic, basement or crawl space with 0”
clearance from any side, front, rear or duct work.
NOTE: If the unit is located above a nished ceiling
or living space, an auxiliary safety drain pan must be
installed under the unit. A separate drain line must be
installed from the safety pan.
The unit must be installed in a level position to ensure proper
condensate drainage. Make certain the unit is level in both
directions within 1/8”.
When the unit is installed in an enclosed area, the room
should be large enough, and have an opening large enough
to allow replacement of the unit. All servicing is done from
the front. A clearance of 24” is needed for service, unless the
closet door aligns with the front of the unit.
NOTE: If you are installing the unit in an unconditioned
space such as an attic or crawlspace, you must ensure
that the area provides sufcient air circulation to prevent
moisture collection on the cabinet during high dew point
conditions. A drain pan must be installed under the
entire unit when it is installed above a nished ceiling or
location in an unconditioned space.
DUCT WORK
The duct work should be installed in accordance with the
NFPA No. 90A “Installation of Air Conditioning and Ventilating
Systems” and NFPA No. 90B “Residential Type Warm Air
Heating and Air Conditioning Installation”.
The duct work should be insulated in accordance with the
applicable requirements for the particular type installation as
required by HUD, FHA, VA, the applicable building code, local
utility, or other governing body.
INSTALLATION GUIDE
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