2
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 ex-
ceed –.35 in. wg with Durablade or EconoMi$er economizer or
–.45 in. wg without economizer.
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; ei-
ther 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. See Fig. 5. 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.
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 refer-
ence. See Table 1 and Fig. 6 for additional information. Operat-
ing weight is shown in Table 1 and Fig. 6.
Lifting holes are provided in base rails as shown in Fig. 6
and 7. Refer to rigging instructions on unit.
POSITIONING — Maintain clearance around and above unit
to provide proper airflow and service access. See Fig. 7.
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 be-
tween roof curb and condenser fan end of unit (see Fig. 2, sec-
tions 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.
All panels must be in place when rigging and lifting.
Fig. 1 — Horizontal Conversion Panels
Summary of Contents for 50TFF008-014
Page 43: ......