Electrical Wiring; Line Voltage Wiring; Grounding - Oxbox J951X U Series Installation Instructions Manual

ELECTRICAL WIRING

WARNING:
ELECTRICAL SHOCK, FIRE OR
EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury, death or property
damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical
power to furnace.
• When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
• Electrical connections must be in compliance with all
applicable local codes with the current revision of the
National Electric Code (ANSI/NFPA 70).
• For Canadian installations the electrical connections
and grounding shall comply with the current Canadian
Electrical Code (CSA C22.1 and/or local codes).
IMPORTANT NOTE:
If replacing any of the original wires supplied with the
furnace, the replacement wire must be copper wiring and
have a temperature rating of at least 105° F (40° C). For
electrical specifications, refer to the furnace nameplate
or .
Table 5 (page 23)
FURNACE FURNACE
MODEL INPUT
NUMBER (BTUH)
38,000
J951X038BU
54,000
J951X054BU
72,000
J951X072CU
85,000
J951X090CU
J951X108DU 108,000
115,000
J951X120DU
54,000
J951X054BD
72,000
J951X072CD
90,000
J951X090CD
THERMOSTAT WIRE GAUGE
24
22
20
18
CABINET NOMINAL
WIDTH ELECTRICAL
(IN.) SUPPLY
17 ½ 115-60-1
17 ½ 115-60-1
21 115-60-1
21 115-60-1
24 ½ 115-60-1
24 ½ 115-60-1
17 ½ 115-60-1
21 115-60-1
21 115-60-1
Table 5. Wire Length & Voltage Specifications

Line Voltage Wiring

It is recommended that the line voltage (115 VAC) to the
furnace be supplied from a dedicated branch circuit containing
the correct fuse or circuit breaker for the furnace as listed
in .
Table 5 (page 23)
The installer should become familiar with the units wiring
diagram before making any electrical connections to the
unit. See Figure 31 (page 30)
the unit wiring label.
IMPORTANT NOTES:
An electrical disconnect must be installed readily
accessible from and located within sight of the furnace.
See or the wiring diagram label inside
Figure 25 (page 24)
of the control door. Any other wiring methods must be
acceptable to authority having jurisdiction.
Proper line voltage polarity must be maintained in order
for the control system to operate correctly. Verify the
incoming neutral line is connected to the white wire and
the incoming HOT line is connected to the black wire.
The furnace will not operate unless the polarity and
ground are properly connected as shown in

Grounding

WARNING:
To minimize personal injury, the furnace cabinet
must have an uninterrupted or unbroken electrical
ground. The controls used in this furnace require
an earth ground to operate properly. Acceptable
methods include electrical wire or conduit
approved for ground service. Do not use gas
piping as an electrical ground!
MAXIMUM MINIMUM
OPERATING OPERATING
VOLTAGE VOLTAGE
127 103
127 103
127 103
127 103
127 103
127 103
127 103
127 103
127 103
RECOMMENDED THERMOSTAT WIRE LENGTH
2 - WIRE
(HEATING)
55 ft.
90 ft.
140 ft.
225 ft.
, Figure 32 (page 31) , or
.
Figure 25
MAXIMUM
FURNACE
AMPERES
9.3
9.3
9.3
12.0
12.0
12.0
9.3
9.3
12.0
4 OR 5 WIRE
(COOLING)
25 ft.
45 ft.
70 ft.
110 ft.
23