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INSTALLATION INSTRUCTIONS
Heating and Cooling Application Two−Stage Wiring Diagram with Single−Stage Thermostat
BLOWER
DOOR
SWITCH
BLK
BLK
WHT
WHT
GND
115 VOLT FIELD
JUNCTION
SUPPLIED
BOX
FUSED
DISCONNECT
J−Box Installation
WARNING
!
FIRE OR ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
If field−supplied manual disconnect switch is to be
mounted on furnace casing side, select a location where
a drill or fastener cannot damage electrical or gas
components.
The J-Box is used when field line voltage electrical connections
are made to the furnace wiring harness inside the furnace
casing. The J-Box is not required if a field-supplied electrical
box is attached to the outside of the furnace casing and the box
is grounded to the green ground wire of the main wiring
harness and the earth ground of the field electrical supply.
The J−Box cover, mounting bracket and screws are shipped in
the loose parts bag included with the furnace. The J−Box can
be mounted on the left or right side of the casing, as viewed
from the upflow position. (See Figure 36)
440 01 4001 05
NOTE 2
W
C
FIVE
WIRE
THREE WIRE
HEATING
ONLY
W2
C
O
COM
N
W/W1
T
NOTE 1
R
Y/Y2
O
R
L
G
24 VOLT
TERMINAL
NOTES: 1.
BLOCK
FURNACE
Specifications subject to change without notice.
Gas Furnace: (F/G)9MVT, (F/G)9MXT, (F/G)9MXE
FIELD 24 VOLT WIRING
FIELD 115 , 208/230 , 460 VOLT WIRING
FACTORY 24 VOLT WIRING
FACTORY 115 VOLT WIRING
1 STAGE
G
Y
R
THERMOSTAT
TERMINALS
CONDENSING
UNIT
Connect Y/Y2 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.
Figure 36
Optional J−Box Locations
Representative drawing only, some models may vary in appearance.
FIELD SUPPLIED
FUSED DISCONNECT
208/230 OR
460 VOLT
THREE
PHASE
208/230
VOLT
SINGLE
PHASE
GND
A11401
OPTIONAL
J−BOX
LOCATIONS
L12F024
31
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