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3. Ahigh-density fiberglass (2 lb minimum density) or semi-
rigid foamed insulation such as Styrofoam™ will be re-
quired inside the ducts to prevent air erosion. The insu-
lation must be firmly secured in the discharge duct near
the blower discharge to withstand the high air velocity.
Step 7 — Insulate the Unit — The 09BY units are
not insulated. If the unit will be operated during cold weather
and the equipment room is not at outdoor temperatures, the
unit cabinet should be insulated to prevent condensation. In-
sulate the unit in the same manner as the ductwork insula-
tion described in Condenser Air Duct Insulation section on
page 10.
Step 8 — Complete Electrical Connections
IMPORTANT: Units may be used on 208, 230, 460,
or 575 v, 3-phase systems. As shipped from the fac-
tory, units are wired for 460 v or 575 v operation. If
the unit will be used on a 208 or 230 v system, rewire
the condenser fan motor prior to unit start-up.The 575-v
motor is connected to the proper voltage as shipped,
and all connections are internal to the motor.
To rewire the unit, disconnect and reconnect the wires at
the motor junction box as shown on the connection diagram
on the unit motor cover or in the unit wiring book.
GENERAL — Verify that nameplate electrical requirements
match available power supply. Voltage at condenser must be
within the minimum and maximum shown in Table 4 and
phases must be balanced within 2%. Contact local power com-
pany for line voltage corrections. Never operate a motor where
a phase imbalance in supply voltage is greater than 2%. Use
the following formula to determine the percentage of volt-
age imbalance:
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage
Example: Supply voltage is 240-3-60.
AB = 243 v
BC = 236 v
AC = 238 v
243 + 236 + 238
Average Voltage =
3
717
=
3
= 239 v
Table 4 — Electrical Data
UNIT
09BY
VOLTAGE
(3 Ph, 60 Hz)
SUPPLY VOLTAGE* FAN POWER SUPPLY
Min Max FLA Hp MCA MOCP
006
208/230 187 254 7.5
2
9.4 15
460 414 508 3.4 4.3 15
575 518 632 2.7 3.4 15
008
208/230 187 254 10.5
3
13.6 20
460 414 508 4.8 6.0 15
575 518 632 3.9 4.9 15
012
208/230 187 254 10.5
3
13.6 20
460 414 508 4.8 6.0 15
575 518 632 3.9 4.9 15
014
208/230 187 254 16.7
5
20.9 35
460 414 508 7.6 9.5 15
575 518 632 6.1 7.6 15
016
208/230 187 254 16.7
5
20.9 35
460 414 508 7.6 9.5 15
575 518 632 6.1 7.6 15
024
208/230 187 254 30.8
10
38.5 60
460 414 508 14.0 17.5 30
575 518 632 11.0 13.8 20
LEGEND
FLA — Full Load Amps
MCA — Minimum Circuit Amps. Used for wire sizing.
(Complies with NEC Section 430-24.)
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code
*Units are suitable for use on electrical systems where voltage sup-
plied to the unit terminals is within listed minimum and maximum
limits.
NOTES:
1. Maximumallowablephase imbalance:Voltage ± 2%;Amps± 10%.
2. Maximum incoming wire size for power circuit is 2/0 max.
Fig. 10 — Placement of Duct Flanges on Units
09BY016 and 09BY024
11