The junction box can be moved to left-hand side of furnace when
a left-hand side power supply is desired. Remove 2 screws holding
junction box. Mount junction box on left-hand side of furnace. The
blower door interlock switch must also be moved to left-hand side
of furnace due to length of wiring harness. (Holes have been
provided in casing). When moved, tuck wiring harness behind 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, the furnace control status LED will flash
rapidly and prevent heating operation.
B.
24-v Wiring
Refer to ESD Precautions Procedure before proceeding with 24-v
connections.
Make field 24-v connections at 24-v terminal block. (See Fig. 11.)
Connect terminal Y/Y2 as shown in Fig. 9 or 10 for proper cooling
operation. Use only AWG No. 18 or larger, color-coded copper
thermostat wire.
The 24-v circuit contains an automotive-type, 3-amp fuse located
on main control. Any 24-v electrical shorts during installation,
service, or maintenance could cause this fuse to blow. If fuse
replacement is required, use ONLY a 3-amp fuse. The control will
flash code 24 when fuse needs replacement.
C.
Accessories
1. Electronic air cleaner (EAC)
A terminal block (EAC-1 [hot] and EAC-2 [neutral]) is
provided for EAC connection. (See Fig. 11.) The terminals
are energized with 115v, 1-amp maximum during blower
motor operation.
2. Humidifier (HUM)
Screw terminals (HUM and C
OM
) are provided for 24-v
humidifier connection. The terminals are energized with
24v, 0.5-amp maximum when the gas valve is energized.
Fig. 9—Heating and Cooling Application Wiring Diagram 1-Stage Thermostat and Condensing Unit
A99071
115-V FUSED
DISCONNECT
SWITCH
(WHEN REQUIRED)
JUNCTION
BOX
CONTROL
BOX
24-V
TERMINAL
BLOCK
TWO-WIRE
HEATING-
ONLY
FIVE
WIRE
1-STAGE THERMOSTAT TERMINALS
FIELD-SUPPLIED
FUSED DISCONNECT
CONDENSING
UNIT
FURNACE
COM
R
W
Y
R
G
C
GND
GND
GND
GND
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
W/W1
W2
Y/Y2
G
NOTES:
1. Connect Y-terminal as shown for proper operation.
2. Some thermostats require a "C" terminal connection as shown.
3. If any of the original wire, as supplied, must be replaced,
use same type or equivalent wire.
TABLE 5—ELECTRICAL DATA
UNIT SIZE
VOLTS—
HERTZ—
PHASE
OPERATING
VOLTAGE RANGE
MAX
UNIT
AMPS
MIN
WIRE
GAGE
MAX WIRE
LENGTH (FT)‡
MAXIMUM FUSE OR
CKT BKR AMPS†
Max*
Min*
036040
115—60—1
127
104
11.4
14
32
15
024060
115—60—1
127
104
8.2
14
45
15
036060
115—60—1
127
104
10.6
14
34
15
042080
115—60—1
127
104
11.7
14
31
15
048080
115—60—1
127
104
13.4
14
27
15
036100
115—60—1
127
104
10.5
14
35
15
048100
115—60—1
127
104
13.2
14
28
15
060100
115—60—1
127
104
17.7
12
32
20
048120
115—60—1
127
104
13.2
14
28
15
060120
115—60—1
127
104
18.2
12
31
20
060135
115—60—1
127
104
17.4
12
33
20
* Permissible limits of the voltage range at which the unit will operate 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.
—9—
