LIMITATIONS
These units must be installed in accordance with the following
national and local safety codes.
1. National Electrical Code ANSI/NFPS No. 70 or Canadian
Electrical Code Part 1, C22.1 (latest editions)
2. National Fuel Gas Code Z223.1 or CAN/CGA B149.1 or .2
Installation Code.
3. Local gas utility requirements.
4. Local plumbing and waste water codes and other applica-
ble local codes.
Refer to Table 1 for unit application data and to Table 2 for gas
heat application data.
If components are to be added to a unit to meet local codes,
they are to be installed at the dealer’s and/or the customer’s
expense.
Size of unit for proposed installation should be based on heat
loss calculations made according to methods of the Air Condi-
tioning Contractors of America.
LOCATION
Use the following guidelines to select a suitable location for
these units.
1. Unit is designed for outdoor installation only.
2. Condenser must have an unlimited supply of air. Where a
choice of location is possible, position unit on either north
or east side of building.
WARNING:Excessive exposure of this furnace to contami-
nated combustion air may result equipment dam-
age or personal injury. Typical contaminates
include: permanent wave solutions, chlorinated
waxes and cleaners, chlorine based swimming
pool chemicals, water softening chemicals, carbon
tetrachloride, Halogen type refrigerants, cleaning
solvents (e.g. perchloroethylene), printing inks,
paint removers, varnishes, hydrochloric acid, ce-
ments and glues, antistatic fabric softeners for
clothes dryers, masonry acid washing materials.
3. For ground level installation, use a level concrete slab with
a minimum thickness of 4 inches. The length and width
should be at least 6 inches greater than the unit base. Do
not tie the slab to the building foundation.
4. For roof top installation, be sure the structure will support
the weight of the unit plus any field installed components.
Unit must be installed on a level roof curb or appropriate
angle iron frame providing adequate support under the
compressor/condenser section.
5. Maintain level tolerance of unit to 1/8" maximum.
RIGGING OR HANDLING
Care must be exercised when moving the unit. Do not remove
any packaging until the unit is near the place of installation. Rig
unit with slings placed under the unit. Spreader bars of suffi-
cient length should be used across the top of the unit.
BEFORE LIFTING A UNIT, MAKE SURE THAT ITS WEIGHT
IS DISTRIBUTED EQUALLY ON THE CABLES SO THAT IT
WILL LIFT EVENLY.
Units may also be moved or lifted with a fork-lift. Slotted
openings in the skid are provided for this purpose.
Refer to Table 4 for unit weights and to Figure 1 for approximate
center of gravity.
CLEARANCES
All units require certain clearances for proper operation and
service. Installer must make provisions for adequate combus-
tion and ventilation air in accordance with Section 5.3, Air for
Combustion and Ventilation of the National Fuel Gas Code,
ANSI Z223.1 (in U.S.A.) or Sections 7.2, 7.3 or 7.4 of Gas
Installation Codes CAN/CGA-B149.1 and .2 (in Canada)
and/or applicable provisions of the local building codes. Refer
to Figure 5 for the clearances required for combustible con-
struction, servicing, and proper unit operation.
WARNING:Do not permit overhanging structures or shrubs to
obstruct the condenser air discharge, combustion
air inlet or vent outlet.
DUCT WORK
Duct work should be designed and sized according to the
methods of the Air Conditioning Contractors of America
(ACCA), as set forth in their Manual K.
A closed return duct system shall be used. This shall not
preclude use of economizers or ventilation air intake. Flexible
joints may be used in the supply and return duct work to
minimize the transmission of noise.
CAUTION: When fastening duct work to the side duct flanges
on the unit, insert the screws through the duct
flanges only. DO NOT insert the screws through
the casing. Outdoor duct work must be insulated
and waterproofed.
NOTE: Be sure to note supply and return openings.
Refer to Figure 5 for information concerning side supply and
return air duct openings.
INSTALLATION
Model D3GH
018
024
030
036
Voltage Variation
Min./Max.
1
187/253
Cooling
Wet Bulb Temp.
(°
F) of Air on Evap.
Coil, Min./Max.
57/72
57/72
57/72
57/72
Dry Bulb Temp.
(°
F) of Air on Cond.
Coil, Min./Max.
45/120
45/120
45/120
45/120
Heating
Minimum Ambient
Temperature.
(°
F)
-40
-40
-40
-40
1
Utilization range “A” in accordance with ARI Standard 110.
TABLE 1 - UNIT APPLICATION DATA
APPROXIMATE
CENTER OF
GRAVITY
FRONT
67-3/4
30
30-1/2
15-1/8
FIG. 1 - CENTER OF GRAVITY
530.44-N5Y
Unitary Products Group
3
