Specifications

Page 8 of 32 / IM 1060-3
Figure 8: Suggested Return Ducting per ASHRAE and SMACNA Publications
Two 90° Turns Prior to the Intake
(Ductwork Sized Based on Airow)
Flexible Connector
Acoustic/Thermal
Lining 10ft. (3 meters)
Ductwork Supported
Independent of Unit
Acoustic/Thermal
Lining
Acoustic/Thermal
Lining
Return Air Intake
Located
Away from the
Unit Blower
Flexible Connector
Ventilation Air
Ventilation may require outside air. The temperature of the
ventilation air must be controlled so that mixture of outside
air and return air entering the conditioner does not exceed
conditioner application limits. It is also typical to close off
the ventilation air system during unoccupied periods (night
setback).
The ventilation air system is generally a separate building
subsystem with distribution ductwork. Simple introduction of
the outside air into each return air plenum chamber reason-
ably close to the conditioner air inlet is not only adequate, but
recommended. Do not duct outside air directly to the condi-
tionerinlet.Providesufcientdistanceforthoroughmixingof
outside and return air. See "Operating Limits" on page 11.
Electrical Data
General
1. Verify the compatibility between the voltage and phase
of the available power and that shown on the unit serial
plate. Line and low voltage wiring must comply with local
codes or the National Electrical Code, whichever applies.
2. Applycorrectlinevoltagetotheunit.A7⁄8"(22mm)hole
and/ora1-1⁄8"(29mm)knockoutissuppliedontheside
of the unit. A disconnect switch near the unit is required
by code. Power to the unit must be sized correctly and
have dual element (Class RK5) fuses or an HACR circuit
breaker for branch circuit overcurrent protection. See the
nameplate for correct ratings.
3. Three phase 50 cycle units, 380/50-3, require a neutral
wire for 230/50-1 power to the fan circuit.
4. Connect the thermostat/subbase wiring with the power
“off ” to the unit.
5. Field supplied relays installed on the input terminals
W1, W2, Y1, Y2 or G may introduce electrical noise.
Never install relay coils in series with the inputs.
230-Volt Operation
All 208/230-volt three-phase units are factory wired for 208-
volt operation. For 230-volt operation, the line voltage tap on
the 24-volt transformer must be changed. Disconnect and cap
the red lead wire and interchange it with the orange lead wire
on the primary of the 24-volt transformer.
Table 4: Electrical Data
Unit Size Voltage/Hz/Phase
Fan
Compressor 1 Compressor 2
Fan Motor Total Unit
Minimum
Minimum
Maximum
Motor (HP)
RLA LRA RLA LRA
FLA FLA Voltage Circuit Amps Fuse Size
88.0
44.0
30.0
46.0
83.1
41.0
33.0
43.0
110.0
52.0
38.9
51.5
5.6
2.8
2.3
3.4
5.6
2.8
2.0
3.4
9.5
4.5
3.4
4.8
14.7
6.6
4.6
6.6
15.3
6.9
5.4
6.8
17.4
8.6
6.5
8.6
14.7
6.6
4.6
6.6
15.3
6.9
5.4
6.8
17.4
8.6
6.5
8.6
88.0
44.0
30.0
46.0
83.1
41.0
33.0
43.0
110.0
52.0
38.9
51.5
208/230-60-3
460-60-3
575-60-3
380-50-3
208/230-60-3
460-60-3
575-60-3
380-50-3
208/230-60-3
460-60-3
575-60-3
380-50-3
072
096
120
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
3
3
3
3
35.0
16.0
11.5
16.6
36.2
16.6
12.8
17.0
44.3
21.7
16.4
22.0
187.0
416.0
520.0
342.0
187.0
416.0
520.0
342.0
187.0
416.0
520.0
342.0
38.7
17.7
12.7
18.3
40.0
18.3
14.2
18.7
48.7
23.9
18.0
24.2
50
20
15
20
50
25
15
25
60
30
20
30