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Step 3 — Locate Unit —
area that allows easy removal of the filter and access panels,
with enough room for service personnel to perform mainte-
nance or repair. Provide sufficient room to make fluid, electri-
cal, and duct connections. If the unit is located in a confined
space such as a closet, provisions must be made for return air to
freely enter the face of unit's air coil. On horizontal units, allow
adequate room below the unit for a condensate drain trap and
do not locate the unit above supply piping.
Step 4 — Mount the Unit
HORIZONTAL UNIT (50PTH) — While horizontal units
may be installed on any level surface strong enough to hold
their weight, they are typically suspended above a ceiling by
threaded rods. The manufacturer recommends these be at-
tached to the unit corners by hanger bracket kits. The rods must
be securely anchored to the ceiling. Refer to the hanging brack-
et assembly and installation instructions for details.
CAUTION
To avoid equipment damage, ensure horizontal units
installed above the ceiling conform to all local codes. An
auxiliary drain pan, if required by code, should be at least
4 in. larger than the bottom of the heat pump.
Plumbing connected to the heat pump must not come in di-
rect contact with joists, trusses, walls, etc. Some applications
require an attic floor installation of the horizontal unit. In this
case the unit should be set in a full size secondary drain pan on
top of a vibration absorbing mesh.
The secondary drain pan prevents possible condensate over-
flow or water leakage damage to the ceiling.
The secondary drain pan is usually placed on a plywood
base isolated from the ceiling joists by additional layers of vi-
bration absorbing mesh. In both cases, a
to this secondary pan should be run to an eave at a location that
will be noticeable.
If the unit is located in a crawl space, the bottom of the unit
must be at least 4-in. above grade to prevent flooding of the
electrical parts during heavy rains.
IMPORTANT: Horizontal units must be installed pitched
toward the condensate drain connection
VERTICAL UNITS (50PTV) — Vertical units should be
mounted level on a vibration absorbing pad slightly larger than
the base to minimize vibration transmission to the building
structure. It is not necessary to anchor the unit to the floor. (See
Fig. 5.)
IMPORTANT: On vertical units the condensate drain pan
is internally sloped. There is no internal P-Trap.
Step 5 — Check Duct System —
let collar and return air duct flange are provided on all units to
facilitate duct connections.
IMPORTANT: Supply air duct and return air duct flanges
are shipped unfolded with unit.
Fold the duct flange outwards along the perforated line. Re-
fer to Fig. 1-3 for physical dimensions of the collar and flange.
A flexible connector is recommended for supply and return
air duct connections on metal duct systems. All metal ducting
should be insulated with a minimum of 1 in. duct insulation to
avoid heat loss or gain and prevent condensate forming during
the cooling operation. Application of the unit to uninsulated
Locate the unit in an indoor
3
/
-in. drain connected
4
1
/
-in. per foot.
8
A supply air out-
ductwork is not recommended as the unit's performance will
be adversely affected.
To avoid equipment damage, do not connect discharge
ducts directly to the blower outlet.
The factory-provided air filter must be removed when using
a filter back return air grille. The factory filter should be left in
place on a free return system.
If the unit will be installed in a new installation which in-
cludes new ductwork, the installation should be designed using
current ASHRAE (American Society of Heating, Refrigerating
and Air-Conditioning Engineers) procedures for duct sizing. If
the unit is to be connected to existing ductwork, a check should
be made to assure that the duct system has the capacity to han-
dle the air required for the unit application. If the duct system is
too small, larger ductwork should be installed. Check for exist-
ing leaks and repair.
The duct system and all diffusers should be sized to handle
the designed airflow quietly. To maximize sound attenuation of
the unit blower, the supply and return air plenums should be in-
sulated. There should be no direct straight air path through the
return air grille into the heat pump. The return air inlet to the
heat pump must have at least one 90-degree turn away from the
space return air grille. If air noise or excessive airflow are a
problem, the blower speed can be changed to a lower speed to
reduce airflow.
Fig. 5 — Vertical Unit on Vibration Pad
Step 6 — Install Condensate Drain —
line must be connected to the heat pump and pitched away
from the unit a minimum of
densate to flow away from the unit. (See Fig. 6.)
This connection must be in conformance with local plumb-
ing codes. A trap must be installed in the condensate line to en-
sure free condensate flow.
8
CAUTION
VIBRATION
PAD FULL SIZE
A
1
/
-in. per foot to allow the con-
8
drain
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