User`s manual

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4. Locate the unit where the vent hood will be a mini-
mum of 4 ft from openable windows or doors.
5. This installation must conform with local building
codes and with NFGC (National Fuel Gas Code);
ANSI (American National Standards Institute)
Z223.1-1988 (Canada, CAN/CGA [Canadian Gas
Association] B149.1, [2]-M86); or NFPA (National
Fire Protection Association) 54-1988 TIA-54-84-1.
Refer to Provincial and local plumbing or wastewater
codes and other applicable local codes.
6. Approved for outdoor installation only on wood floor-
ing or on class A, B, or C roof covering materials.
INSTALLATION
Unit is shipped in the vertical airflow configuration (see
Fig. 1). To convert to horizontal discharge, remove horizontal
duct opening covers. Using the same screws, install covers
with insulation-side down (facing outside) on the unit on ver-
tical duct openings. Seals around duct openings must be
tight.
These units are equipped with an energy-saving, automatic,
electric direct-spark ignition system that does not have a
continuously burning pilot. All units are manufactured with
natural gas controls.
These units are designed for a minimum continuous return-
air temperature of 50 F (dry bulb) or an intermittent opera-
tion down to 45 F (dry bulb), such as when used with a night
setback thermostat.
All units can be connected into existing duct systems that are
properly sized and designed to handle an airflow of 300 to
500 cfm per each 12,000 Btuh of rated cooling capacity.
NOTE: When installing any accessory item, see the manu-
facturer’s installation instructions packaged with the acces-
sory. A qualified agency must use factory-authorized kits or
accessories when modifying this unit.
I. LOCATE THE UNIT
A. Clearance
Maintain clearance around and above unit to provide mini-
mum distance from combustible materials, proper airflow,
and service access (see Fig. 2 and 3).
Minimum clearance to combustibles is 48 in. on flue side
(18 in. with accessory flue discharge deflector), 0 in. on all
other sides.
Minimum clearance on all sides to block walls or any other
grounded surface is 42 inches.
Minimum clearance of 36 in. should be provided on side with
outdoor-air intake, if unit is so equipped.
Minimum distance between unit and other electrically live
parts is 48 inches.
Do not install unit in an indoor location. Do not locate unit
air inlets near exhaust vents or other sources of contami-
nated air.
Be sure that unit is installed so that snow will not block the
combustion intake or flue outlet.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Slab-mounted units should be at least 4 in. above the highest
expected water, flood, and runoff levels. Do not use the unit if
it has been under water.
Locate mechanical draft system flue assembly at least 48 in.
from any opening through which combustion products could
enter the building, and at least 24 in. from an adjacent build-
ing. When unit is located adjacent to public walkways, flue
assembly must be at least 7 ft above grade.
Flue gas can deteriorate building materials. Orient unit so
that flue gas will not affect building materials.
Adequate combustion-air space must be provided for proper
operation of this equipment. Be sure that installation com-
plies with all local codes.
Flue vent discharge must have a minimum horizontal clear-
ance of 4 ft from electric and gas meters, gas regulators, and
gas relief equipment.
B. Roof Curb Mount
Assemble and install accessory roof curb in accordance with
instructions shipped with curb (see Fig. 4). Install insula-
tion, cant strips, roofing felt, and counter flashing as shown.
Ductwork must be attached to curb. If gas, electric power, or
control power is to be routed through the curb, attach the
utility connection plates to the roof curb in accordance with
the accessory installation instructions. Accessory electric
and gas utility connection plates must be installed before
unit is in place on roof curb.
NOTE: If thru-the-bottom power and gas connections are
used, refer to the accessory installation instructions for
information on installation. Refer to Fig. 3 for drilling holes
in basepan.
IMPORTANT: The gasketing of the unit to the roof curb is
critical for watertightness. Install gasket with the roof curb
as shown in Fig. 4. Improperly applied gasket can also result
in air or water leaks and poor unit performance.
Curb should be level. This is necessary for unit drain to func-
tion properly. Unit leveling tolerances are shown in Fig. 5.
C. Slab Mount (Horizontal Units Only)
Provide a level concrete slab that extends a minimum of 6 in.
beyond unit cabinet. Install a 6 in. gravel apron in front of
condenser coil air inlet to prevent grass and foliage from ob-
structing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
SERVICE CLEARNCE
OPERATIONAL CLEARANCE
42”
42”
42”
48”
36”
12”
Fig. 2 — Service and Operational Clearances