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 board fault code indicator light will
flash rapidly and the furnace will not operate.
24-V WIRING — Make field 24-v connections at the 24-v termi-
nal 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 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.
ACCESSORIES
1. Electronic Air Cleaner (EAC)
Two quick-connect terminals, marked EAC-1 and EAC-2 are
provided for EAC connection. These terminals are energized
with 115-v, (1.0-amp maximum) during blower motor opera-
tion.
2. Humidifier (HUM)
Quick-connect terminal HUM and screw terminal C
OM
-24V
are provided for 24-v humidifier connection. The terminals are
energized with 24-v 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
090-14
115—60—1
127
104
9.0
14
31
15
090-16
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
135-16
115—60—1
127
104
10.1
14
28
15
135-20
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
A99408
115-V FIELD-
SUPPLIED
DISCONNECT
AUXILIARY
J-BOX
24-V
TERMINAL
BLOCK
THREE-WIRE
HEATING-ONLY
FIVE WIRE
NOTE 1
NOTE 2
FIELD-SUPPLIED
DISCONNECT
CONDENSING
UNIT
TWO
WIRE
FURNACE
C
O
N
T
R
O
L
R
G
COM
W
C
R
G
Y
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
BLOWER DOOR SWITCH
WHT
BLK
WHT
BLK
NOTES:
Connect Y-terminal in furnace as shown for proper blower 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
