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20
Fig. 17 — Typical Access Panel and Compressor
Locations
Step 4 — Provide Unit Support
ROOF CURB MOUNT
Accessory roof curb details and dimensions are shown in Fig. 20-
22. Assemble and install accessory roof curb in accordance with
instructions shipped with the curb.
NOTE: The gasketing of the unit to the roof curb is critical for a
watertight seal. Install gasket supplied with the roof curb as shown
in Fig. 20-22. Improperly applied gasket can also result in air leaks
and poor unit performance.
Curb should be level. This is necessary for unit drain to function
properly. Unit leveling tolerances are shown in Fig. 18. Refer to
Accessory Roof Curb Installation Instructions for additional infor-
mation as required.
Install insulation, cant strips, roofing felt, and counter flashing as
shown. Ductwork must be attached to curb and not to the unit.
Thru-the-base power connection must be installed before the unit
is set on the roof curb. If field-installed thru-the-roof curb gas con-
nections are desired remove knockout in basepan located in the
gas section, see Fig. 17 for location. Gas connections and power
connections to the unit must be field installed after the unit is in-
stalled on the roof curb.
Fig. 18 — Unit Leveling Tolerances
If electrical and control wiring is to be routed through the basepan,
remove the knockouts in the basepan located in the control box ac-
cess area (see Fig. 17). For basepan knockout locations for vertical
airflow units, see Fig. 2, 7, or 12; for horizontal airflow units, see
Fig. 3, 8, or 13. Attach the service connections to the basepan.
SLAB MOUNT (HORIZONTAL UNITS ONLY)
Provide a level concrete slab that extends a minimum of 6-in.
(150 mm) beyond unit cabinet. Install a gravel apron in front of
condenser coil air inlet to prevent grass and foliage from obstruct-
ing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
A non-combustible sleeper rail can be used in the unit curb sup-
port area. If sleeper rails cannot be used, support the long sides of
the unit with a minimum of 4 equally spaced 4-in. x 4-in. (102 mm
x 102 mm) pads on each side. Locate pads so that they support the
rails. Make sure to avoid the fork openings.
Fig. 19 — Rigging Details
CONTROL BOX
ACCESS PANEL
FILTER AND
INDOOR COIL
ACCESS PANEL
INDOOR BLOWER
ACCESS PANEL
GAS HEAT
ACCESS PANEL
COMPRESSOR
(EACH SIDE)
HOOD CARTON LOCATION
(REAR ACCESS PANEL)
A-B
0.25 (6)
B-C
0.5 (12)
A-C
0.5 (12)
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A
B
C
"B"
"C"
"A"
(914-1371)
36"-54"
DETAIL A
SEE DETAIL A
PLACE ALL
S
EAL
S
TRIP
IN PLACE BEFORE PLACING
UNIT ON ROOF CURB.
DUCT END
NOTES:
1. Dimensions in ( ) are inches.
2. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around the unit center of gravity. Use
wooden top to prevent rigging straps from damaging unit.
UNIT
MAX WEIGHT
DIMENSIONS
A
B
C
lb
kg
in.
mm
in.
mm
in.
mm
48LC*B14
2135
970
127.8
3249
59.1
1501
52.3
1328
48LC*B17
2377
1080
141.5
3595
65.5
1664
60.3
1532
48LC*B20
2483
1129
141.5
3595
65.5
1664
60.3
1532
48LC*B24
2629
1195
157.8
4007
72.8
1849
60.3
1532
48LC*B26
2774
1261
157.8
4007
72.8
1849
60.3
1532
Summary of Contents for WeatherExpert 48LC B14 Series
Page 4: ...4 Fig 2 48LC B14 Vertical Airflow ...
Page 5: ...5 Fig 3 48LC B14 Horizontal Airflow ...
Page 6: ...6 Fig 4 48LC B14 Back View and Condensate Drain Location ...
Page 7: ...7 Fig 5 48LC B14 Corner Weights and Clearances ...
Page 8: ...8 Fig 6 48LC B14 Bottom View ...
Page 9: ...9 Fig 7 48LC B17 20 Vertical Airflow ...
Page 10: ...10 Fig 8 48LC B17 20 Horizontal Airflow ...
Page 11: ...11 Fig 9 48LC B17 20 Back View and Condensate Drain Location ...
Page 12: ...12 Fig 10 48LC B17 20 Corner Weights and Clearances ...
Page 13: ...13 Fig 11 48LC B17 20 Bottom View ...
Page 14: ...14 Fig 12 48LC B24 26 Vertical Airflow ...
Page 15: ...15 Fig 13 48LC B24 26 Horizontal Airflow ...
Page 16: ...16 Fig 14 48LC B24 26 Back View and Condensate Drain Location ...
Page 17: ...17 Fig 15 48LC B24 26 Corner Weights and Clearances ...
Page 18: ...18 Fig 16 48LC B24 26 Bottom View ...
Page 21: ...21 Fig 20 48LC B14 Roof Curb Details ...
Page 22: ...22 Fig 21 48LC B17 20 Roof Curb Details ...
Page 23: ...23 Fig 22 48LC B24 26 Roof Curb Details ...
Page 30: ...30 Fig 40 48LC B14 26 VAV RTU Open Control Wiring Diagram ...
Page 31: ...31 Fig 41 48LC B14 26 Power Wiring Diagram ...
Page 53: ......