4. Connect line voltage leads as shown in Fig. 22.
FOR BX CABLE INSTALLATION
1. Route BX cable to hole in J-Box.
2. Secure BX cable to J-Box bracket with connectors approved
for the type of cable used.
3. Secure ground wire to green screw on J-Box bracket.
4. Connect line voltage leads as shown in Fig. 22.
J-BOX COVER INSTALLATION
1. Remove J-Box cover from blower access door on furnace and
reinstall blower access door screw.
2. Insert tab of J-Box cover into slot of J-Box bracket.
3. Fold tab on J-Box bracket with pliers.
4. Secure J-Box cover to bracket with screw provided.
5. Remove U-shaped cut-out from outer door to clear J-box.
24-V WIRING
Make field 24-v connections at the 24-v terminal strip. (See Fig.
32.) Connect terminal Y/Y2 as shown in Fig. 22 or Fig. 24-31 for
proper cooling operation. Use only AWG No. 18, color-coded,
copper thermostat wire.
The 24-v circuit contains an automotive-type, 3-amp fuse located
on the control. Any direct shorts during installation, service, or
maintenance could cause this fuse to blow. If fuse replacement is
required, use ONLY a 3-amp fuse of identical size.
Fig. 22—Field Wiring Diagram
A95236
115-VOLT FIELD-
SUPPLIED
FUSED
DISCONNECT
JUNCTION
BOX
CONTROL
BOX
24-VOLT
TERMINAL
BLOCK
THREE-WIRE
HEATING-
ONLY
FIVE
WIRE
NOTE 2
NOTE 1
1-STAGE
THERMOSTAT
TERMINALS
FIELD-SUPPLIED
FUSED DISCONNECT
CONDENSING
UNIT
FURNACE
COM
R
W
C
Y
R
G
GND
GND
FIELD 24-VOLT WIRING
FIELD 115-, 208/230-, 460-VOLT WIRING
FACTORY 24-VOLT WIRING
FACTORY 115-VOLT WIRING
Connect Y/Y2-terminal as shown for proper operation.
Some thermostats require a "C" terminal connection as shown.
If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
208/230- OR
460-VOLT
THREE
PHASE
208/230-
VOLT
SINGLE
PHASE
WHT
BLK
WHT
BLK
W/W1
W2
Y/Y2
G
NOTES: 1.
2.
3.
→
Table 5—Electrical Data
UNIT SIZE
VOLTS-
HERTZ-
PHASE
OPERATING
VOLTAGE RANGE
MAXIMUM
UNIT AMPS
UNIT
AMPACITY#
MAXIMUM
WIRE LENGTH (FT)‡
MAXIMUM
FUSE OR CKT BKR
AMPS†
MINIMUM
WIRE GAGE
Maximum* Minimum*
070-12/036070 115-60-1
127
104
9.0
12.0
30
15
14
090-16/048090 115-60-1
127
104
9.6
12.6
29
15
14
110-22/066110 115-60-1
127
104
15.1
19.3
29
20
12
135-22/066135 115-60-1
127
104
14.9
19.1
30
20
12
155-22/066155 115-60-1
127
104
15.0
19.2
29
20
12
* 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. 23—Relocating J-Box
A02099
TWO
17