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Step 5 —
Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition) shall
not exceed 0.35 in. wg (87 Pa) with economizer or without
economizer.
For vertical ducted applications, secure all ducts to roof curb and
building structure.
Do not connect ductwork to unit.
Fabricate supply ductwork so that the cross sectional dimensions
are equal to or greater than the unit supply duct opening dimen
-
sions for the first 18-in. (458 mm) of duct length from the unit
basepan.
Insulate and weatherproof all external ductwork, joints, and roof
openings with counter flashing and mastic in accordance with ap
-
plicable codes.
Ducts passing through unconditioned spaces 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.
UNITS WITH ACCESSORY OR OPTIONAL ELECTRIC
HEATERS
Minimum clearance is not required around ductwork.
Step 6 —
Rig and Place Unit
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 Table 2
on page 19 and Fig. 22 for additional information.
Lifting holes are provided in base rails as shown in Fig. 22. Refer
to rigging instructions on unit.
Before setting the unit onto the curb, recheck gasketing on curb.
Fig. 22 —
Rigging Details
WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could cause personal injury.
For vertical supply and return units, tools or parts could drop
into ductwork and cause an injury. Install a 90 degree turn in
the return ductwork between the unit and the conditioned
space. If a 90 degree elbow cannot be installed, then a grille of
sufficient strength and density should be installed to prevent
objects from falling into the conditioned space. Due to electric
heater, supply duct will require 90 degree elbow.
CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage to roofing
materials.
Membrane roofs can be cut by sharp sheet metal edges. Be
careful when placing any sheet metal parts on such roof.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
All panels must be in place when rigging. Unit is not designed
for handling by fork truck when packaging is removed.
If using top crate as spreader bar, once unit is set, carefully
lower wooden crate off building roof top to ground. Ensure
that no people or obstructions are below prior to lowering the
crate.
NOTES:
1. Dimensions in ( ) are in millimeters.
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
50LC-*14
2004
911
127.8
3249
59.1
1501
52.3
1328
50LC-*17
2246
1021
141.5
3595
65.5
1664
60.3
1532
50LC-*20
2353
1069
141.5
3595
65.5
1664
60.3
1532
50LC-*24
2499
1136
157.8
4007
72.8
1849
60.3
1532
50LC-*26
2643
1201
157.8
4007
72.8
1849
60.3
1532
"B"
"C"
"A"
(914-1371)
36"-54"
DETAIL A
SEE DETAIL A
PLACE ALL SEAL STRIP
IN PLACE BEFORE PLACING
UNIT ON ROOF CURB.
DUCT END
Summary of Contents for WeatherExpert 50LC14
Page 4: ...4 Fig 2 50LC Vertical Airflow Size 14...
Page 5: ...5 Fig 3 50LC Horizontal Airflow Size 14...
Page 6: ...6 Fig 4 50LC Back View and Condensate Drain Location Size 14...
Page 7: ...7 Fig 5 50LC Corner Weights and Clearances Size 14...
Page 8: ...8 Fig 6 50LC Bottom View Size 14...
Page 9: ...9 Fig 7 50LC Vertical Airflow Sizes 17 20...
Page 10: ...10 Fig 8 50LC Horizontal Airflow Sizes 17 20...
Page 11: ...11 Fig 9 50LC Back View and Condensate Drain Location Sizes 17 20...
Page 12: ...12 Fig 10 50LC Corner Weights and Clearances Sizes 17 20...
Page 13: ...13 Fig 11 50LC Bottom View Sizes 17 20...
Page 14: ...14 Fig 12 50LC Vertical Airflow Sizes 24 26...
Page 15: ...15 Fig 13 50LC Horizontal Airflow Sizes 24 26...
Page 16: ...16 Fig 14 50LC Back View and Condensate Drain Location Sizes 24 26...
Page 17: ...17 Fig 15 50LC Corner Weights and Clearances Sizes 24 26...
Page 18: ...18 Fig 16 50LC Bottom View Sizes 24 26...
Page 21: ...21 Fig 19 Roof Curb Details 14 Size Unit...
Page 22: ...22 Fig 20 Roof Curb Details 17 and 20 Size Units...
Page 23: ...23 Fig 21 Roof Curb Details 24 and 26 Size Units...
Page 30: ...30 Fig 42 50LC 14 26 Electro Mechanical Control Wiring Diagram...
Page 31: ...31 Fig 43 50LC 14 26 RTU Open Control Wiring Diagram...
Page 32: ...32 Fig 44 50LC 14 26 SystemVu Control Wiring Diagram...
Page 35: ...35 Fig 47 Typical Power Wiring Diagram SystemVu Controls 50LC Unit 208 230V Shown...
Page 36: ...36 Fig 48 Typical Power Wiring Diagram SystemVu Controls 50LC Unit 460V 575V Shown...
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