Slab Mount (Horizontal Units Only); Alternate Unit Support - Carrier 50HCQ Installation Instructions Manual

Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are shown in
Fig. 7. Refer to Accessory Roof Curb Installation
Instructions for additional information as required.
Fig. 7 − Unit Leveling Tolerances
Install insulation, cant strips, roofing felt, and counter
flashing as shown. Ductwork must be attached to curb and
not to the unit. The accessory thru−the−base power package
must be installed before the unit is set on the roof curb.
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A-B B-C A-C
0.5" (13) 1.0" (25) 1.0" (25)
C06110
If electric and control wiring is to be routed through the
basepan, attach the accessory thru−the−base service
connections to the basepan in accordance with the
accessory installation instructions.
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 obstructing 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
support area. If sleeper rails cannot be used, support the long
sides of the unit with a minimum of 3 equally spaced 4−in. x
4−in. (102 mm x 102 mm) pads on each side.
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