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WARNING
!
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance. What
to do if you smell gas:
DO NOT try to light any appliance.
DO NOT touch any electrical switch, or use any phone in
your building.
IMMEDIATELY call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.
If you cannot reach your gas supplier, call the fire
department.
WARNING
!
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect gas piping from unit when pressure testing at
pressure greater than 0.5 psig. Pressures greater than
0.5 psig will cause gas valve damage resulting in hazardous
condition. If gas valve is subjected to pressure greater than
0.5 psig, it must be replaced before use. When pressure
testing field-supplied gas piping at pressures of 0.5 psig or
less, a unit connected to such piping must be isolated by
closing the manual gas valve(s).
IMPORTANT: Units have high ambient operating limits. If limits
are exceeded, the units will automatically lock the compressor out
of operation. Manual reset will be required to restart the
compressor.
INSTALLATION
Step 1 — Provide Unit Support
Roof Curb
Assemble or install accessory roof curb in accordance with
instructions shipped with this accessory. (See Fig. 1.) Install
insulation, cant strips, roofing, and counter flashing as shown.
Ductwork can be installed to roof curb before unit is set in place.
Ductwork must be attached to curb and not to the unit. Curb must
be level. This is necessary to permit unit drain to function properly.
1
Unit leveling tolerance is ±
/
16- -
Refer to Accessory Roof Curb Installation Instructions for
additional information as required. When accessory roof curb is
used, unit may be installed on class A, B, or C roof covering
material. Carrier roof curb accessories are for flat roofs or slab
mounting.
IMPORTANT: The gasketing of the unit to the roof curb is critical
for a watertight seal. Install gasket with the roof curb as shown in
Fig. 1. Improperly applied gasket can also result in air leaks and
poor unit performance. Do not slide unit to position on roof curb.
Alternate Unit Support
When a curb cannot be used, install unit on a noncombustible
surface. Support unit with sleepers, using unit curb support area. If
sleepers cannot be used, support long sides of unit with a minimum
of 3 equally spaced 4-in. x 4-in. pads on each side.
in. per linear ft in any direction.
Slab Mount (Horizontal Units Only)
Provide a level concrete slab that extends a minimum of 6 in.
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.
Step 2 — Remove Shipping Rails
Remove shipping rails prior to lowering unit onto roof curb. (See
Fig. 2.) The rails are attached to the unit at both the return end and
condenser end. Remove the screws from both ends of each rail. Be
careful not to drop the rails onto any surface that could be
damaged. Discard the rails. It is important to replace the screws
into the unit to avoid any air or water leakage.
CAUTION
!
UNIT OR PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in equipment or
property damage.
Do not allow the shipping rail to drop on the roof surface.
Damage to the roof surface may result.
Step 3 — Rig and Place Unit
Inspect unit for transportation damage. See Table 1-3 for physical
data. File any claim with transportation agency.
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.
Do not drop unit; keep upright. Use spreader bars over unit to
prevent sling or cable damage. Rollers may be used to move unit
across a roof. Level by using unit frame as a reference. Leveling
1
tolerance is ±
/
- -in. per linear ft in any direction. See Fig. 3 for
16
additional information and unit rigging weight.
Four lifting holes are provided in the unit base rails as shown in
Fig. 3. Refer to rigging instructions on unit.
Positioning
Maintain clearance, per Fig. 4, around and above unit to provide
minimum distance from combustible materials, proper airflow, and
service access.
Do not install unit in an indoor location. Do not locate air inlets
near exhaust vents or other sources of contaminated air. For proper
unit operation, adequate combustion and ventilation air must be
provided in accordance with Section 5.3 (Air for Combustion and
Ventilation) of the National Fuel Gas Code, ANSI Z223.1
(American National Standards Institute).
Although unit is weatherproof, guard against water from higher
level runoff and overhangs.
Locate mechanical draft system flue assembly at least 4 ft from any
opening through which combustion products could enter the
building, and at least 4 ft from any adjacent building (or per local
codes). When unit is located adjacent to public walkways, flue
assembly must be at least 7 ft above grade. Locate unit at least 10
ft away from adjacent units.
2
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