Carrier COBRA 48/50HJ004-014 - Manual (Page 6)

6
Step 4 — 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.
Remove the bottom wooden skids that are under the unit by
removing the wooden plates that hold the bottom wooden
frame to the unit. Level by using unit frame as a reference. Lift-
ing holes are provided in base rails as shown in Fig. 6A and 6B.
Refer to rigging instructions on unit.
POSITIONING — Maintain clearance around and above unit
to provide minimum distance from combustible materials,
proper airflow, and service access. A properly positioned unit
will have the following clearances between unit and roof curb:
1 /
4
-in. clearance between roof curb and base rails on each side
and duct end of unit; 1 /
4
-in. clearance between roof curb and
condenser coil end of unit.
Do not install unit in an indoor location. Do not locate unit
air inlets near exhaust vents or other sources of contaminated
air.
Be sure that unit is installed such that snow will not block
the combustion intake or flue outlet.
Unit may be installed directly on wood flooring or on
Class A, B, or C roof-covering material when roof curb is used.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Flue vent discharge must have a minimum horizontal clear-
ance of 4 ft from electric and gas meters, gas regulators, and
gas relief equipment.
Minimum distance between unit and other electrically live
parts is 48 inches.
Flue gas can deteriorate building materials. Orient unit
such that flue gas will not affect building materials. Locate
mechanical draft system flue assembly at least 48 in. from an
adjacent building or combustible material.
Adequate combustion- and ventilation-air space must be
provided for proper operation of this equipment. Be sure that
installation complies with all local codes and Section 5.3, Air
for Combustion and Ventilation, NFGC (National Fuel Gas
Code), and ANSI (American National Standards Institute)
Z223.1, and NFPA (National Fire Protection Association)
54 TIA-54-84-1. In Canada, installation must be in accordance
with the CAN1-B149 installation codes for gas burning
appliances.
After unit is in position, remove rigging skids and shipping
materials.
All panels must be in place when rigging.
CURB
PAD
ROOF
ADJUSTABLE
EQUIPMENT
SUPPORT
SCREW
SUPPORT
IN PLACE
10” x B (SEE CHART)
PROTECTIVE
RUBBER PAD
(EPDM)
C”
A
4”
HVAC UNIT
ENERGY
RECOVERY
SECTION
Fig. 4 — Supplemental Energy Recovery Section Equipment Support
UNIT SIZE
EQUIPMENT SUPPORT
PART NUMBER
DIMENSIONS (in.)
A B C
3-6 Ton
CRAQSUPT001A00 36.9 40 8 to 14
CRAQSUPT002A00 36.9 40 14 to 24
7 1 /
2
-12 1 /
2
Ton
CRAQSUPT003A00 49.7 54 8 to 14
CRAQSUPT004A00 49.7 54 14 to 24