Twinning - Nordyne Upfl ow/Horizontal Installation Instructions Manual

Furnace
Furnace
Model
Input
Number
(Btu/hr)
G7XA
046-23A 46,000
061-24B 61,000
076-24B 76,000
092-35C 92,000
107-45D 107,000
** Time-delay fuses or HACR-type circuit breakers are required.
Thermostat Wire Gauge
24
22
20
18
Proper line voltage polarity must be maintained in
order for the control system to operate correctly.
Verify the incoming neutral line is connected to the
white wire and the incoming "hot" line is connected
to the black wire. The furnace will not operate unless
the polarity and ground are properly connected as
shown in Figure 12 or the wiring diagram label inside
of the control door.

Twinning

The control boards on fi xed speed furnaces are capable
of being twinned to other furnaces of the same series,
only if the following criteria are met:
• The circuit boards are the same.
• The thermostat wires and the 1/4 inch thick quick-connect
terminals marked "TWIN" (Figure 13) on the furnace
controls must be connected together.
• The fuses must remain installed on each board.
• Twinned furnaces must be properly grounded according
to local codes.
14
Cabinet Nominal
Width Electrical
(in.) Supply
¼
14 230-50-1
½ 230-50-1
17
½
230-50-1
17
21 230-50-1
½ 230-50-1
24
Table 2. Wire Length and Voltage Specifi cations
Field Supplied Field Supplied
Fused Service
Disconnect w/in
Panel Sight of Furnace
Black (Hot)
White (Neutral)
Green or Bare
(Ground)
Ground
Field Line Voltage Wiring
Figure 12. Line Voltage Field Wiring
Maximum Minimum
Operating Operating
Voltage Voltage
230 208
230 208
230 208
230 208
230 208
Recommended Thermostat Wire Length
2 - wire
(Heating only)
55 ft.
90 ft.
140 ft.
225 ft.
Junction Box (may be int. or ext.
to the furnace). These connections
can be made in the field supplied
disconnect at the furnace.
Black Black
White White
Ground
Field Supplied
Panel Connector
Factory Line Voltage Wiring
THERMOSTAT
W G Y R
A/C
UNIT
IMPORTANT NOTE: G7 furnaces equipped with
variable speed iSEER™ motors may not be twinned
under any circumstances.
Maximum Minimum
Furnace Wire
Amperes Gauge
6.3 14
9.7 14
9.7 14
11.7 14
15.2 12
4 or 5 wire
(Heating/Cooling)
25 ft.
45 ft.
70 ft.
110 ft.
Black
White
Ground
R
C
Y
G
W
FURNACE
BOARD
MOTOR
BOARD
TWIN TERMINAL
FURNACE 1 FURNACE 2
Figure 13. Twinning
Maximum
Fuse or Circuit
Breaker Amps**
15
20
20
20
30
R
C
Y
G
W
FURNACE
BOARD
MOTOR
BOARD
TWIN TERMINAL