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054D:24B
54,000
17 1A
115-60-1
127
072D-35C
172,000
21
115-60-1
127
090D,35C
90,000
21
115-60-1
127
108D-45D
108,000
24- 1A
115-60:1'
127
** Time-delay fuses or HACR-type circuit breakers are required.
103
103
103
103
!0.0
14
9.3
14
!5.6
14
15:6
14
20
15
30
30
24
i
55 ft"
25 fL
..............................................
22
/
90fL
45fL
20
!
! 40 ft:
I
70 ft"
18
.[
225 ft:
'
110 ft.
Table 6. Wire Length and Voltage Specifications
Junction Box (may be int. or ext.
Field Supplied
Field Supplied
to the furnace). These connections
Fused
Service
Disconnect
w/in
can be made
in the field supplied
Panel
Sight
of Furnace
disconnect
at the furnace.
Black
(Hot)
White
(Neutral)
Green
or Bare
(Ground)
Cki
White
White
Field Supplied
......
Field
Line Voltage
Wiring
__
Factory
Line Voltage
Wiring
__
Black
White
Panel Connector
?
Ground
Figure 38. Line Voltage Field Wiring
3O
Twinning
Single
stage M4 furnaces
are not supplied
with a
built-in twinning capability. Other valuable features and
enhancements were made to the new control that made it
necessary to remove the twinning capability. All standard
two-stage furnaces equipped with the fixed speed iSEER
TM
motor include a twinning terminal on the blower control
board.
However, if both single stage furnaces are upgraded to
the fixed speed iSEER TMblower, the twin terminal on the
blower control boards (Figure 39) may be used to twin the
single stage furnaces only if the following criteria are met:
Both furnaces and motors must be the same size.
Both motors must be on the same speed for cooling
and heating.
Both furnaces must have a common return duct and
common supply plenum.
Both furnaces must be on the same leg of power.
IMPORTANT
NOTE:
M4 furnaces
equipped
with
variable speed iSEER _Mmotors
may not be twinned
under any circumstances.
Please contact your furnace
distributor
for technical
details.
iiii:
......
llll_
_---b--1
f
b
....................
llll,
llll,
llll,
llll,
llll,
llll,
i
•
_
oRI
I .........
o_: i
•
4
4
A/C
UNiT
OL_I
OWl
FURNACE
BOARD
FSHE
BOARD
TWlNTERMINAL
FURNACE 1
oRq
oCI
nYi
OGI
oWl
FURNACE
BOARD
FSHE
BOARD
TWlNTERMINAL
FURNACE 2
Figure 39. Single Stage Twinning
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