screws holding the auxiliary J-box. Mount the J-box on the
left-hand side of the furnace (holes have been pre-drilled in
casing). When moved, tuck the wiring harness behind the clip
provided to keep extra wire lengths out of the way.
NOTE: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control status indicator light will flash rapidly
and the furnace will not operate.
24-V WIRING
Make field 24-v connections at the 24-v terminal strip. (See Fig.
10.) Connect terminal Y as shown in Fig. 9 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 main control board. Any 24-v 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.
ACCESSORIES
1. Electronic Air Cleaner (EAC)
Two quick-connect terminals marked EAC-1 and EAC-2 are
provided for EAC connection. (See Fig. 10.) These terminals
are energized with 115-v, (1.5-amp maximum) during blower
motor operation.
2. Humidifier (HUM)
A quick-connect terminal (HUM) and screw terminal (C
OM)
are provided for 24-v humidifier connection. (See Fig. 12).
HUM terminal is energized with 24v (0.5-amp maximum)
after pressure switch closes.
Table 5—Electrical Data
UNIT SIZE
VOLTS—
HERTZ—
PHASE
OPERATING
VOLTAGE RANGE
MAXIMUM
UNIT AMPS
MINIMUM
WIRE GAGE
MAXIMUM
WIRE LENGTH (FT)‡
MAXIMUM
FUSE OR CKT BKR
AMPS†
Maximum* Minimum*
045-08 115—60—1 127 104 6.0 14 47 15
045-12 115—60—1 127 104 8.3 14 34 15
070-08 115—60—1 127 104 5.9 14 47 15
070-12 115—60—1 127 104 8.7 14 32 15
091-14 115—60—1 127 104 9.0 14 31 15
091-16 115—60—1 127 104 10.4 14 27 15
111-12 115—60—1 127 104 8.0 14 35 15
111-16 115—60—1 127 104 10.1 14 28 15
111-20 115—60—1 127 104 14.4 12 31 20
136-16 115—60—1 127 104 10.1 14 28 15
136-20 115—60—1 127 104 13.3 12 33 20
155-20 115—60—1 127 104 14.0 12 31 20
* Permissible limits of the voltage range at which the unit operates satisfactorily.
† 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. 9—Heating and Cooling Application Wiring Diagram
A98209
115-V
FIELD-SUPPLIED
DISCONNECT
AUXILIARY
J-BOX
CONTROL
BOX
24-V
TERMINAL
BLOCK
THREE-WIRE
HEATING-
ONLY
FIVE
WIRE
NOTE 1
NOTE 2
FIELD-SUPPLIED
DISCONNECT
CONDENSING
UNIT
TWO
WIRE
FURNACE
R
G
C
WCR GY
GND
GND
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
WHT
BLK
WHT
BLK
NOTES: Connect Y-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.
W
Y
GND
THERMOSTAT
TERMINALS
1.
2.
3.
9
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