Step 5 - Field Fabricate Ductwork; Step 6 - Rig And Place Unit - Carrier 50HT-A07 Installation Instructions Manual

Fig. 4 - - Unit Leveling Tolerances
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
0.45 in. wg (112 Pa) without economizer.
For vertical ducted applications, secure all ducts to roof
curb and building structure on vertical ducted units. Do
not connect ductwork to unit.
Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in
accordance with applicable 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.
MAX WEIGHT
UNIT
LB
50HT--- A07 645
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.
3. Unit weights do not include economizer.
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A-B B-C A-C
0.5" (13) 1.0" (25) 1.0" (25)
C06110
KG IN
293 74.38
Fig. 5 - - Rigging Details
For units with accessory electric heaters: Horizontal
applications require a minimum clearance to combustible
surfaces of 1- - in (25 mm) from duct for first 12- - in (305
mm) away from unit. Vertical applications do not require
a minimum clearance around ductwork
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars must be
used when lifting the unit, even when the top crate
remains in place. Rollers may be used to move unit across
a roof. Level by using unit frame as a reference. See Table
1 and Fig. 5 for additional information.
Lifting holes are provided in base rails as shown in Fig5.
Refer to rigging instructions on unit.
Before setting the unit onto the curb, recheck gasketing on
curb.
!
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.
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.
DIMENSION
A B
MM IN
1888 38
8
CAUTION
C
MM IN
965 41.38
C06005
MM
1051