McQuay SWT028C User Manual

20 IM709
Table 9 Supply Fan Motor Data
Supply Power Wiring
1. Units require three-phase power supply.
2. Allowable voltage tolerances:
a. 60 Hertz
Nameplate 208V: Min.187V, Max. 229V
Nameplate 230V: Min.207V, Max. 253V
Nameplate 460V: Min.414V, Max. 506V
Nameplate 575V: Min.518V, Max. 632V
b. 50 Hertz
Nameplate 400V: Min. 342V, Max. 418V
3. Power lead wire sizing:
a. For units with cooling capability (all concurrent
loads) with or without hot water heating and circuits
with motor loads only:
MCA = 1.25 (largest motor RLA or FLA) + other
loads + 2 amps.
b. For units with cooling capability and non concurrent
electric heat capability:
In the cooling mode, the loads will be composed of
supply fan motor and compressors. In heating mode,
the loads will be composed of supply fan motor and
electric heater. The MCA is calculated for unit run-
ning in either mode; the highest value obtained is used
for the MCA.
(1) For unit in cooling mode:
MCA = 1.25 (largest RLA or FLA) + other loads +
2 amps.
(2) For unit in heating mode:
MCA = 1.25 (electric heat FLA + Fan FLA) + 2
amps.
4. Size wires in accordance with Table 310-16 or 310-19 of
the National Electrical Code.
5. Wires should be sized for a maximum of 3% voltage
drop.
Lug Sizes For Single Disconnect or
Power Block
Horsepower TYPE
208/60/3 230/60/3
400/50/3
a
a. 460/60/3 motors are used. Derate nameplate horsepower to 0.83 to obtain actual horsepower.
460/60/3 575/60/3
FLA FLA FLA FLA FLA
3
High Efficiency 9.9 9.0 4.5 4.5 3.4
Premium Efficiency 9.3 8.2 4.1 4.1 3.1
5
High Efficiency 14.8 14.0 7.0 7.0 5.3
Premium Efficiency 15.7 13.6 6.8 6.8 5.2
7.5
High Efficiency 22.3 21.6 10.8 10.8 8.2
Premium Efficiency 22.3 20.0 10.0 10.0 7.4
10
High Efficiency 29.7 28.0 14.0 14.0 11.0
Premium Efficiency 29.0 25.8 12.9 12.9 10.3
15
High Efficiency 44.4 40.6 20.3 20.3 16.2
Premium Efficiency 43.4 37.8 18.9 18.9 14.1
20
High Efficiency 57.0 50.0 25.0 25.0 20.0
Premium Efficiency 57.0 49.0 24.5 24.5 18.9
25
High Efficiency 69.8 62.0 31.0 31.0 24.3
Premium Efficiency 70.5 61.0 30.5 30.5 24.2
Table 10. Single Disconnect
UNIT VOLTAGE SIZE (AMPS)
018-028
208/230 225
018-028
400/460 100
018-028
575 100
035-040
208/230 225
035-040
400/460 150
035
575 100
040
575 150
Table 11. Lug Sizes For Single Disconnect
DISCONNECT SIZE LUG SIZE
100
#6-2/0
150
#2-3/0
225
#3-300 MCM
Table 12. Lug Sizes For Power Block
UNIT VOLTAGE LUG SIZE
018-040
ALL #6-400 MCM

McQuay SWT028C Specifications

General

Brand	McQuay
Model	SWT028C
Category	Air Conditioner
Language	English