508151-01
Issue 2104
Page 19 of 72
On-Board Links
NOTE:
In Comfort Sync systems with a conventional
outdoor unit (non-communicating), the on-board clippable
links must be set to properly configure the system.
Carefully review all configuration information provided.
Failure to properly set DIP switches, jumpers and on-
board links can result in improper operation!
WARNING
On-Board Link W914 Dehum (R to DS)
On-board link W914, is a clippable connection between
terminals R and DS on the integrated control. W914 must
be cut when the furnace is installed with either the zone
control or a thermostat which features humidity control. If
the link is left intact the PMW signal from the control will be
blocked and also lead to control damage. Refer to Table 11
for operation sequence in applications including A96DS2V,
a thermostat which features humidity control and a single-
speed outdoor unit. Table 12 gives the operation sequence
in applications with a two-speed outdoor unit.
On-Board Link W951 Heat Pump (R to O)
On-board link W951 is a clippable connection between
terminals R and O on the integrated control. W951 must
be cut when the furnace is installed in applications which
include a heat pump unit and a thermostat which features
dual fuel use. If the link is left intact, terminal “O” will remain
energized eliminating the HEAT MODE in the heat pump.
On-Board Link W915 2-Stage Compressor
(Y1 to Y2)
On-board link W915 is a clippable connection between
terminals Y1 and Y2 on the integrated control. W915 must
be cut if two-stage cooling will be used. If the link is not cut
the outdoor unit will operate in second-stage cooling only.
Indoor Blower Motor
Power Choke
(4 and 5 Ton Only) Blower Motor
(B3)
Figure 6.
During blower operation, the ECM motor emits
energy that may interfere with pacemaker operation.
Interference is reduced by both the sheet metal cabinet
and distance.
WARNING
The motor communicates with the integrated control via a
2-way serial connection. The motor receives all necessary
functional parameters from the integrated control and does
not rely on a factory program like traditional variable speed
motors. A96DS2V units use a three-phase, electronically
controlled D.C. brushless motor (controller converts single
phase a.c. to three phase D.C.), with a permanent-magnet
type rotor (Figure 7). Because this motor has a permanent
magnet rotor it does not need brushes like conventional
D.C. motors.
The stator windings are split into three poles which are
electrically connected to the controller. This arrangement
allows motor windings to turn on and off in sequence by
the controller.
Earlier ECM motors used on other Allied Air furnace
models are not interchangeable with motors used on
the A96DS2V furnace line.
IMPORTANT
A solid-state controller is permanently attached to the
motor. The controller is primarily an A.C. to D.C. converter.
Converted D.C. power is used to drive the motor. The
controller contains a microprocessor which monitors
varying conditions inside the motor (such as motor
workload).