These units must be installed in accordance with the following
national and local safety codes:
1. National Electrical Code ANSI/NFPA No. 70.
2. National Fuel Gas Code Z223.1.
3. Gas-Fired Central Furnace Standard ANSI Z21.47a.
4. Local gas utility requirements.
5. Canadian Electrical Code C22.1
6. Canadian Installation Codes CAN1-B149.
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/heat gain calculation made according to the methods of
the Air Conditioning Contractors of America (ACCA).
Thisfurnaceisnottobeusedfortemporaryheatingofbuildings
or structures under construction.
LOCATION
Use the following guidelines to select a suitable location for
these units.
1. Unit is designed for outdoor installation only.
2. Outdoor coil must have an unlimited supply of air. Elevate
the unit sufficiently to prevent any blockage of the air
entrances in areas where snow accumulations are
expected.
WARNING:Excessive exposure of this furnace to
contaminated combustion air may result in
equipment damage 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, cements 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 rails.
Do not tie slab to the building foundation.
4. Roof structure must be able to support the weightoftheunit
and its accessories. Unit must be installed on a solid level
roof curb or appropriate angle iron frame.
CAUTION: If a unit is to be installed on a roof curb or
special frame , gasketing mustbeappliedto all
surfaces that come in contact with the unit
underside.
5. Maintain level tolerance to 1/2" maximum across the entire
length or width of the unit.
OUTDOOR COIL CONDENSATE DRAINAGE
PRECAUTION
Condensate will drain from the outdoor coil during the heating
and defrost cycles. Normally this condensate may be allowed
to drain directly onto the ground/roof. A gravel bed is
recommended to prevent mud splashing.
WARNING:The unit should not be installed in an area where
mud or ice could cause personal injury. Remember
that condensate will drip from the outdoor coil
during heat and defrost cycles and that this
condensatewillfreezewhenthetemperatureofthe
outdoor air is below 32
°
F.
RIGGING AND HANDLING
Exercise care when moving the unit. Do not remove any
packaging until the unit is near the place of installation. Rig the
unit by attaching chain or cable slings to the lifting holes
provided in the base rails. Spreaders, whose length exceeds
the largest dimension across the unit, MUST 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 forklift. Slotted
openings in the base rails are provided for this purpose.
LENGTH OF FORKS MUST BE A MINIMUM OF 54".
Remove the nesting brackets from the four corners on top of
the unit. All screws that are removed when taking these
brackets off must be replaced on the unit.
CAUTION: An adhesive backed label is provided over the
outside of the combustion air inlet opening to
preventmoisturefromenteringtheunitwhichcould
cause damage to electrical components. Allow this
closure label to remain in place until the
combustion air hood is to be installed (refer to
Figure 7).
RefertoTable 4forunitweightsandtoFigure1 forapproximate
center of gravity.
CLEARANCES
All units require certain clearances for
proper operation and service. Installer must make provisions
for adequate combustion 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 10 for the clearances required for
combustible construction, servicing, and proper unit operation.
WARNING:Do not permit overhanging structures or shrubs to
obstruct outdoor air discharge outlet, combustion
air inlet or vent outlet.
DUCTWORK
Ductwork shouldbe designed and sizedaccording to themethods
inManualQoftheAirConditioningContractorsofAmerica(ACCA).
Aclosed return duct system shall be used. This shall not preclude
use of economizers or outdoor fresh air intake. The supply and
INSTALLATION
Model 090 MBH 120 MBH
Voltage
Variation
Min. / Max.*
208 / 230V 187 / 253
460V 414 / 506
575V 518 / 630
Wet Bulb Temperature (°F)
of Air on Indoor Coil,
Min. / Max. 57 / 72 57 / 72
Dry Bulb Temperature (°F)
of Air on Outdoor Coil,
Min. / Max. 45 / 120 45 / 120
*Utilization range “A” in accordance with ARI Standard 110.
TABLE 1 - UNIT APPLICATION DATA
FIG. 1 - CENTER OF GRAVITY DIM. 7-1/2 Ton 10 Ton
A 32" 32-1/2"
B 44-3/4" 44"
511.17-N2W
Unitary Products Group 3
