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Ducts passing through an unconditioned space must be insu-
lated and covered with a vapor barrier.
If plenum return is used on a vertical unit, the return should
be ducted through the roof deck to comply with applicable
fire codes.
If electrical connections are to be routed through the bottom of
the unit, attach accessory thru-the-bottom service connections
to the basepan in accordance with installation instructions.
A minimum clearance is not required around ductwork. Cab-
inet return-air static pressure (a negative condition) should
not exceed 0.30 in. wg with economizer or 0.45 in. wg
without economizer.
III. STEP 3 — INSTALL EXTERNAL TRAP FOR
CONDENSATE DRAIN
The unit’s
3
/
4
-in. condensate drain connections are located on
the bottom and side of the unit. Unit discharge connections
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, ensure the
plug in the alternate bottom connection (in center of pan) 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. 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. If a 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 (
3
/
4
-in.). See Fig. 5.
The center drain plug looks like a star connection, however it
can be removed with a
1
/
2
in. socket drive extension.
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
using unit frame as a reference. See Tables 1A and 1B and
Fig. 6 for additional information. Operating weight is shown
in Tables 1A and 1B and Fig. 6.
Lifting holes are provided in base rails as shown in Fig. 6
and 7A and 7B. Refer to rigging instructions on unit.
A. Positioning
Maintain clearance around and above unit to provide proper
airflow and service access. See Fig. 7A and 7B.
Position unit on roof curb so that the following clearances are
maintained:
1
/
4
-in. clearance between roof curb and base
rails on duct end, front and back of unit; 3
5
/
16
-in. clearance
between roof curb and condenser fan end of unit (see Fig. 2,
sections A-A and C-C).
Do not install unit in an indoor location. Do not locate unit
air inlet near exhaust vents or other sources of contaminated
air.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
After unit is in position, remove shipping materials and rig-
ging skid.
CAUTION: All panels must be in place when rig-
ging and lifting. Unit is not designed for handling by a
fork truck. Damage to unit may result.
Fig. 1 — Horizontal Conversion Panels