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VOLTS-
FURNACE SIZE
HERTZ-
PHASE
045-08/024045
115-60-1
045-12/036045
115-60-1
070-08/024070
115-60-1
070-12/036070
115-60-1
070-16/048070
115-60-1
090-14/042090
115-60-1
090-16/048090
115-60-1
090-20/060090
115-60-1
110-12/036110
115-60-1
110-16/048110
115-60-1
110-22/066110
115-60-1
135-16/048135
115-60-1
135-22/066135
115-60-1
155-20/060155
115-60-1
* Permissible limits of the voltage range at which the unit operates satisfactorily.
# Unit ampacity = 125 percent of largest operating component's full load amps plus 100 percent of all other potential operating components' (EAC, humidifier, etc.) full load
amps.
† Time-delay type is recommended.
‡ Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.
Fig. 22—Relocating J-Box
2. Cut wire tie on loop in furnace wires attached to J-Box.
3. Move box to desired location.
4. Fasten J-Box to casing with two screws removed in Step 1.
5. Route J-Box wires within furnace away from sharp edges,
rotating parts, and hot surfaces.
ELECTRICAL CONNECTION TO J-BOX
→
Field-Supplied Electrical Box on Furnace J-Box Bracket
See Fig. 23.
1. Remove cover from furnace J-Box.
2. Attach electrical box to furnace J-Box bracket with at least
two field-supplied screws through holes in electrical box into
holes in bracket. Use blunt-nose screws that will not pierce
wire insulation.
3. Route furnace power wires through holes in electrical box and
J-Box bracket, and make field-wire connections in electrical
box. Use best practices (NEC in U.S. and CSA C22.1 in
Canada) for wire bushings, strain relief, etc.
→ Table 7—Electrical Data
OPERATING
MAXIMUM
VOLTAGE RANGE
UNIT AMPS
Maximum* Minimum*
127
104
5.4
127
104
7.0
127
104
5.0
127
104
6.8
127
104
9.5
127
104
8.2
127
104
10.0
127
104
13.6
127
104
8.2
127
104
10.1
127
104
14.8
127
104
10.2
127
104
14.4
127
104
15.0
TWO
UNIT
MAXIMUM
AMPACITY#
WIRE LENGTH (FT)‡
7.54
9.50
7.06
9.22
12.60
10.83
13.13
17.61
10.75
13.12
18.99
13.27
18.55
19.33
A02099
→ Fig. 23—Field-Supplied Electrical Box on
4. Route and secure field ground wire to green ground screw on
J-Box bracket.
5. Connect line voltage leads as shown in Fig. 25.
6. Reinstall cover to J-Box. Do not pinch wires between cover
and bracket.
20
MAXIMUM
FUSE OR CKT BKR
AMPS†
49
15
39
15
52
15
40
15
29
15
34
15
28
15
32
20
34
15
28
15
30
20
27
15
30
20
29
20
Furnace Casing
MINIMUM
WIRE GAUGE
14
14
14
14
14
14
14
12
14
14
12
14
12
12
A03221
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