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16.1 Disconnect Fuse Sizing
The fuse classification must be determined by the service disconnect rating plate and all applicable codes.
Fuse sizing is determined by the motor size, control current and supply voltage. Fuses that are being
replaced must be replaced with the same type, size and class of fuse that was supplied with the air handler.
For additional information or to confirm original fuse specifications, consult the factory.
Table 8: Minimum and Maximum Fuse Size by Motor Size and Supply Voltage
Motor Size HP(kW)
208/3/60
2(1.5)
7.3-10.2
3(2.2)
10.1-14.2
5(3.7)
15.4-21.6
7.5(5.6)
23.1-32.4
10(7.5)
30.4-42.6
15(11.2)
42.4-59.4
20(14.9)
51.4-72.0
25(18.6)
66.4-93.0
30(22.4)
78.4-109.8
40(29.8)
50(37.3)
16.2 Wiring and Electrical Connections
All electrical wiring and connections, including
electrical grounding, must comply with:
United States: Refer to National Electrical Code
NFPA 70 - latest revision. Wiring must conform to the
most current National Electrical Code
ordinances, and any special diagrams furnished.
Canada: Refer to Canadian Electrical Code, CSA
C22.1 Part 1 - latest revision.
Check rating plate on air handler for supply voltage
and current requirements.
If any of the original control wire supplied with the air
handler must be replaced, replace it with type MTW
105°C, 600 V, 16 gauge wire or equivalent, except for
temperature control wiring, which must be a minimum
of 20 AWG Type Beldon 5401FE CMR 75C shielded
or equivalent.
For all other wires, replace with the equivalent size
and type of wire that was originally provided with the
air handler.
16.3 Remote Panel
The remote panel must be wired as shown on the
electrical schematic. For wire gauge sizes, see Page
41, Table 9. All power supply and motor wiring must
be minimum type THWN with a 167° F (75° C)
temperature rise.
16.3.1 Remote Panel Mounting Distance
If the interconnection wiring between the remote
panel and the air handler control enclosure is run in a
single conduit, the wire run can be as long as 100'
230/3/60
6.9-9.6
9.3-13.0
15.1-21.1
21.3-29.8
28.1-39.3
39.3-55.0
49.3-69.0
61.3-85.8
73.3-102.6
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®
, local
Electrical Characteristics
460/3/60
3.4-4.8
4.6-6.5
7.5-10.6
10.6-14.9
14.0-19.7
19.6-27.5
24.6-34.5
30.6-42.9
36.6-51.3
47.6-66.7
59.5-83.3
(30 m). For longer wire runs, consult the factory. If the
interconnection wiring between the remote panel and
the air handler control enclosure is run in two
conduits (separating the shielded cable and the 120
®
,
V power supply for the remote panel), the wire run
can be as long as 200' (60 m). For longer wire runs,
consult the factory. Care should be used to avoid
running the interconnect wiring near large industrial
loads or high voltage wire runs as that may further
limit the length of the interconnect wire run.
Table 9: Control Voltage Wiring For All Control
Systems
Volts
120
120
120
NOTE: Wiring for temperature controls must be run in
shielded cable as indicated on the wiring diagram.
16.3.2 Low Voltage Control Wiring
Low voltage (24 V - AC/DC) control wiring in excess
of 100' (30.5 m) in length should be in its own
separate conduit run to prevent interference.
16.4 Motor Current Draw
For specific current requirements, see rating plate
located on the blower motor. Current draw may be
adjusted downward by reducing blower rotations per
minute (RPM) or by increasing external static
pressure.
SECTION 16: E
575/3/60
230/1/60
2.6-3.6
13.3-18.6
3.7-5.2
17.3-24.2
6.1-8.5
24.3-34.0
8.3-11.6
32.3-45.2
10.6-14.8
40.3-56.4
16.8-23.5
19.8-27.7
24.5-34.3
29.6-41.4
38.0-52.6
48.1-66.7
Wire Gauge
Max Wire
18
150' (45 m)
16
250' (75 m)
14
350' (106 m)
LECTRICAL
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