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ALTERNATE UNIT SUPPORT — When the curb cannot
be used, install unit on a noncombustible surface. Support
unit with sleepers, using unit curb support area. If sleepers
cannot be used, support long sides of unit with a minimum
of 3 equally spaced 4-in. x 4-in. pads on each side.
Step 2 — Rig and Place Unit — Inspect unit for trans-
portation damage. File any claim with transportation agency.
Do not drop unit; keep upright. Use spreader bars over
unit to prevent sling or cable damage. Rollers may be used
to move unit across a roof. Level by using unit frame as a
reference; leveling tolerance is ±
1
⁄
16
in. per linear ft in any
direction. See Fig. 3 for additional information. Unit oper-
ating weight is shown in Table 1.
Four lifting holes are provided in ends of unit base rails
as shown in Fig. 3. Refer to rigging instructions on unit.
POSITIONING — Maintain clearance, per Fig. 4and 5, around
and above unit to provide minimum distance from combus-
tible materials, proper airflow, and service access.
Do not install unit in an indoor location. Do not locate
unit air inlets near exhaust vents or other sources of con-
taminated air. For proper unit operation, adequate combus-
tion and ventilation air must be provided in accordance with
Section 5.3 (Air for Combustion and Ventilation) of the
National Fuel Gas Code, ANSI Z223.1 (American National
Standards Institute).
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Locate mechanical draft system flue assembly at least
4 ft from any opening through which combustion products
could enter the building, and at least 4 ft from any adjacent
building. When unit is located adjacent to public walkways,
flue assembly must be at least 7 ft above grade.
ROOF MOUNT — Check building codes for weight distri-
bution requirements. Unit weight is shown in Table 1.
Instructions continued on page 7.
UNIT
48HJ
MAXIMUM SHIPPING
WEIGHT
Lb Kg
D015 1920 871
E015 1940 880
E017 2310 1048
D025 2535 1150
Dimension A
UNIT Ft-in. mm
48HJD015 3-1
3
⁄
8
949
48HJE015 3-1
1
⁄
4
946
48HJE017 3-4
3
⁄
4
1035
48HJD025 3-4
3
⁄
4
1010
NOTES:
1. Dimensions in ( ) are in millimeters.
2. Refer to Table 1 for unit operating weights.
3. Remove boards at ends of unit and runners prior to rigging.
4. Rig by inserting hooks into unit base rails as shown. Use corner
postfrom packagingtoprotect coilfromdamage. Usebumperboards
for spreader bars.
5. Weights donot includeoptional economizer. SeeTable1 forecono-
mizer weight.
6. Weights givenare for aluminumevaporator coil platefins and cop-
per condensercoil plate fins. Weights of othermetal combinations
are listed in Table 1.
All panels must be in place when rigging.
Fig. 3 — Rigging Details
Fig. 2 — Horizontal Supply/Return Curb
and Horizontal Adapter Details
3