Units may also be moved or lifted with a fork-lift. Slotted open-
ings in the base rails are provided for this purpose. The 7-1/2
ton unit may be lifted from either the LH or RH side - under the
unit.
LENGTH OF FORKS MUST BE A MINIMUM OF 42" (for 7-1/2
ton units) and a MINIMUM OF 54" (for 10 ton units) when lifting
from either side.
Remove the nesting brackets from the four corners on top of
the unit. All screws that are removed to take these brackets off
must be replaced on the unit
CLEARANCES
All units require certain minimum clearances for proper opera-
tion and service. Refer to Figure 4 for these clearances.
WARNING: Do not permit overhanging structures or shrubs to
obstruct air discharge.
Additional height may be required for snow clearance if winter
operation is expected.
COMPRESSORS
Units are shippedwith compressormountingsfactory-adjusted
and ready for operation.
CAUTION: Do Not loosen compressor mounting bolts.
COMPRESSOR CRANKCASE HEATER
The compressor is equipped with a crankcase heater to pre-
vent refrigerant from mixing with crankcase oil during the
OFF cycle. The heaters will be energized when the compres-
sor is not running providing the unit disconnect switch is
closed.
CAUTION: Do not attempt to start the compressor without at
least eight hours of crankcase heat or compressor
damage will occur.
If a unit has just been installed or the unit disconnect switch has
been open for a long period of time, move the system switch on
the room thermostat to the “OFF” position before closing the
unit disconnect switch. Eight hours of crankcase heat are re-
quired to drive the liquid refrigerant out of the compressor bef-
ore the compressor can be started.
POWER AND CONTROL WIRING
Install electrical wiring in accordance with the latest National
Electrical Code (NFPA Standard No. 70) and/or local regula-
tions. The unit should be grounded in accordance with these
codes.
POWER WIRING
Check the voltage of the power supply against the data on the
unit nameplate. Check the size of the power wire, the discon-
nect switch and the fuses against the data on Table 3.
NOTE:
Copper conductors must be installed between the dis-
connect switch and the unit.
Refer to Figure 4 for the location of the power wire access
opening through the front of the unit. This opening will require a
field-supplied conduit fitting.
The field-supplied disconnect switch must be suitable for an
outdoor location. Although it should be installed near the unit,
do NOT secure it to the unit cabinet.
Refer to Figure 3 for typical field wiring.
CONTROL WIRING
Refer to Figure 4 for the location of the control wire access
opening through the front of the unit.
Route the necessary low voltage control wires from terminal
block 1TB of the unit controlbox throughthis accessopeningto
the indoor unit and to the room thermostat. Refer to Figure 3 for
typical field wiring.
The room thermostat should be mounted about 5 feet above
the floor and located where it will be exposed to normal room
air circulation.Do not locate it on an outside wall, near a supply
air grill, or where it may be affected by sunlight and/or drafts.
Circulation of air to the thermostat should not be blocked by
curtains, drapes, furniture, partitions, etc.
4
Unitary Products Group
035-15410-002-B-0404
FIG. 2
- TYPICAL RIGGING
MODEL
EFB090
EFB120
Compressor
1
Rating, (Tons)
7-1/2
10
Fans
Quantity
1
2
Diameter, (In.)/No. Blades
24/3
24/3
Nominal CFM
4604
7600
Fan Motors
2
HP
3/4
1/2
RPM
1100
1100
Coil
Face Area, (Sq. Ft.)
18.75
24.00
Rows Deep x Rows High
2 x 30
2 x 36
Finned Length, (In.)
90
96
Tube (Copper) OD - inches
3/8
3/8
Fins (Aluminum) per inch
18
16
Refrigerant-22
(Lbs.)
Holding Charge
1.0
2.25
Operating Charge
3
14.3
21.4
Pumpdown Capacity
4
19.6
24.6
Unit Weight
(Lbs.)
Shipping
355
435
Operating
350
430
1
These compressors are fully hermetic.
2
These PSC motors are directly connected to the outdoor fans and have inherent protection,
ball bearings and a 48 frame. Rotation (when viewing the shaft end of the motor) - 090=CW,
120=CCW.
3
Includes outdoor unit and matched indoor blower unit, but no piping. Refer to Table 6 for re-
frigerant line charge.
4
Based on a 95
°
F ambient.
TABLE 2
- PHYSICAL DATA
5 F T . M I N .
FORK-LIFT
OPENINGS
7-1/2 TON UNIT SHOWN
