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INTEGRATED FURNACE CONTROL
11. COMMUNICATING ECM MOTOR
COMMUNICATIONS (CONTROL) CONNECTION
(P4)
This connector sends and receives messages to and
from the blower motor through a single peer-to-peer
network. The blower motor does not communicate on
the same communications buss as the furnace,
condenser (or heat-pump) and thermostat. Further, a
different communications protocol is used.
12. DIPSWITCHES
Seven-Segment Display Orientation; SW1
As the control will be applied in a multi-position furnace, a
means of changing the orientation of the seven-segment
display is required. This dipswitch is to be labeled SW1.
Factory setting of the SW1 dipswitch is OFF. The factory
setting display orientation is with the control placed with
the low voltage terminal block T2 is on the left side.
Cool Blower-Off Delay; SW2 & SW3
A means of selecting the cooling speed blower “off” delay
time is provided. In legacy mode, dipswitches are required
to select the delay time. These dipswitches are labeled
SW2 and SW3. The following table defines the settings:
Selection
SW2
SW3
Selection
A*
OFF
OFF
30 seconds
B
ON
OFF
45 seconds
C
OFF
ON
60 seconds
D
ON
ON
0 seconds
Note: Factory setting = 30 seconds
Cooling Airflow Selection; SW4 & SW5
SW4 and SW5 are used to select cooling airflow in legacy
mode. The value used for each selection is specified
below.
HIGH COOL SELECTIONS:
½ HP Blower
¾ HP Blower
SW4
SW5
(56 & 70 KBTU)
(84, 98 &112 KBTU)
OFF*
OFF
1050 CFM
1750 CFM
ON
OFF
875 CFM
1400 CFM
OFF
ON
700 CFM
1225 CFM
ON
ON
525 CFM
1050 CFM
LOW COOL SELECTIONS:
The following CFM’s will be used for low-stage legacy
cooling unless dipswitch SW9 is in the ON position - in
which case the low cooling airflow becomes 50% of the
high cooling airflow.
½ HP Blower
¾ HP Blower
SW4
SW5
(56 & 70 KBTU)
(84, 98 &112 KBTU)
OFF*
OFF
788 CFM
1313 CFM
ON
OFF
656 CFM
1050 CFM
OFF
ON
525 CFM
919 CFM
ON
ON
394 CFM
788 CFM
*Factory Setting
Airflow dipswitches are to be used to determine airflow
when a legacy (24 VAC) call is placed on the thermostat
inputs of the control. Communicated calls will have CFM
requirements as part of the call (when a legacy condenser
is attached to a communicating furnace the airflow de-
mand will be transmitted from the communicating thermo-
stat as the installer will configure the cooling airflow
requirements for the non-communicating condenser at the
thermostat and the airflow requirements for the condenser
will be stored, at and transmitted from, the thermostat).
HUMIDISTAT (24V)
(CONTACTS OPEN
WHEN HUMIDITY
IS ABOVE SET POINT)
ST-A1194-81
SWITCH #S2-8 MUST BE IN “ON POSITION
(NOTE: FACTORY POSITION IS ”OFF”).
TURNING THIS SWITCH “OFF” WILL DISABLE
DEHUMIDIFICATION OPERATION WITH A
NON-COMMUNICATING THERMOSTAT
SA1
SA2
OAT1
OAT2
S1
S2
S3
HUM
HUM
EAC
L1
N
E
U
T
R
A
L
1
2
R
C
HUM STAT
W1
W2
G
Y1
Y2
B
FIGURE 52
HUMIDISTAT USED TO CONTROL DEHUMIDIFICATION IN COOLING ONLY (NO HUMIDIFIER)
NOTE: FOR USE WITH NON-COMMUNICATING THERMOSTATS.
ST-A1194-81-00
HUMIDISTAT
(24V)
(CONTACTS
OPEN
WHEN
HUMIDITY IS
ABOVE SET
POINT)
SWITCH #S2-8 MUST BE IN “ON” POSITION (NOTE: FACTORY
POSITION IS “OFF”). TURNING THIS SWITCH “OFF” WILL DISABLE
DEHUMIDIFICATION OPERATION WITH A NON-COMMUNICATING
THERMOSTAT