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SLAB MOUNT (Horizontal Units Only) — Provide a level
concrete slab that extends a minimum of 6 in. beyond the unit
cabinet. Install a gravel apron in front of the condenser coil air
inlet to prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
ALTERNATE UNIT SUPPORT — When the curb or
adapter cannot be used, support unit with sleepers using unit
curb or adapter support area. If sleepers cannot be used, sup-
port the long sides of the unit with a minimum of 3 equally
spaced 4-in. x 4-in. pads on each side.
Step 2 — Field Fabricate Ductwork —
ducts to the roof curb and building structure on vertical dis-
charge units. Do not connect ductwork to the unit. For horizon-
tal applications, field-supplied flanges should be attached to
horizontal discharge openings and all ductwork should be at-
tached to the flanges. Insulate and weatherproof all external
ductwork, joints, and roof openings with counterflashing and
mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be
insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with applica-
ble fire codes.
A minimum clearance is not required around ductwork.
Cabinet return-air static pressure (a negative condition) should
not exceed 0.35 in. wg with economizer or 0.45 in. wg without
economizer.
Step 3 — Install Condensate Drain Line and
External Trap —
Condensate drain connections are locat-
ed on the bottom and side of the unit. Unit discharge connec-
tions do not determine the use of drain connections; either
drain connection can be used with vertical or horizontal dis-
charge units.
When using the standard side drain connection, make sure
the plug in the alternate bottom connection is tight before
installing the unit.
To use the bottom drain connection for a roof curb installa-
tion, relocate the factory-installed plug from the bottom con-
nection to the side connection. The center drain plug looks like
a star connection, but can be removed using a
drive extension. See Fig. 3. The piping for the condensate drain
and external trap can be completed after the unit is in place.
All units must have an external trap for condensate drain-
age. Install a trap at least 4 in. deep and protect against freeze-
up. If the drain line is installed downstream from the external
trap, pitch the line away from the 50TFQ unit at
run. Do not use a pipe size smaller than the unit connection.
See Fig. 4.
Step 4 — Rig and Place Unit —
transportation damage, and file any claim with the transporta-
tion agency. Keep the unit upright and do not drop it. Spreader
Secure all
bars are not required if top crating is left on the unit, and rollers
may be used to move the unit across a roof. Level by using the
unit frame as a reference. See Table 1 and Fig. 5 for additional
information. Operating weight is shown in Table 1 and Fig. 5.
Lifting holes are provided in base rails as shown in Fig. 5
and 6. Refer to rigging instructions on the unit.
All panels must be in place when rigging. Unit is not
designed for handling by a fork truck. Damage to unit may
result.
POSITIONING — Maintain clearance around and above the
unit to provide proper airflow and service access. See Fig. 6.
A properly positioned unit will have the following clearanc-
1
es:
/
-in. clearance between the roof curb and base rails on
4
each side and front of the unit;
roof curb and rear of unit. (See Fig. 1, section C-C.)
Do not install the unit indoors. Do not locate the unit air in-
lets near exhaust vents or other sources of contaminated air.
Although the unit is weatherproof, guard against water from
higher level runoff and overhangs.
After the unit is in position, remove the polyethylene ship-
ping wrapper and top crating.
2
1
/
-in. socket
2
1
/
in. per ft of
4
Inspect the unit for
1
/
-in. clearance between the
4
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