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II. STEP 2 — FIELD FABRICATE DUCTWORK
Secure all ducts to roof curb and building structure on verti-
cal discharge units. Do not connect ductwork to unit. For hori-
zontal applications, field-supplied flanges should be attached
to horizontal discharge openings and all ductwork should be
attached to the flanges. Insulate and weatherproof all exter-
nal ductwork, joints, and roof openings with counter flashing
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 applicable
fire codes.
A minimum clearance to combustibles is not required around
ductwork on vertical discharge units. On horizontal dis-
charge units, a minimum clearance of 1 in. is required for
the first 12 in. of ductwork. Cabinet return-air static shall
not exceed
.35 in. wg with Durablade economizer or
.45 in. wg without economizer.
III. STEP 3 — INSTALL EXTERNAL TRAP FOR CONDEN-
SATE DRAIN
The unit's
⁄
-in. condensate drain connections are located
3
4
at 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
applications.
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 instal-
lation, relocate the factory-installed plug from the bottom con-
nection to the side connection. See Fig. 4. 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. See Fig. 5. If drain line is installed downstream from the
external trap, pitch the line away from the unit at 1 in. per
10 ft of run. Do not use a pipe size smaller than the unit
connection.
IV. STEP 4 — RIG AND PLACE UNIT
Inspect unit for transportation damage. File any claim with
transportation agency. Keep unit upright and do not drop.
Spreader bars are not required if top crating is left on unit.
Rollers may be used to move unit across a roof. Level by us-
ing unit frame as a reference. See Table 1 and Fig. 6 for ad-
ditional information. Operating weight is shown in Table 1
and Fig. 6.
Lifting holes are provided in base rails as shown in Fig. 7.
Refer to rigging instructions on unit.
Fig. 1 — Horizontal Conversion Panels
—2—
CAUTION: All panels must be in place when rigging.
Copy continued on page 7.
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