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controller. The DDC controls option contains the
following installed components:
Dirty Filter Switch Indicator (DFS)
The switch is adjustable and measures pressure drop
across the unit filter surface. When pressure drop is
higher than the switch setting, NO contacts are provided
to indicate the filter needs to be serviced. Refer to page
34 for instructions on making switch adjustments.
Discharge Air Sensor
The discharge air sensor provides a temperature reading
of the supply air leaving the unit. The sensor is a 10K
OHM @ 77°F measuring device. It is installed in the
supply airstream in the heater bracket.
Airflow Switch
The airflow switch measures the pressure differential
between the blower inlet and outlet. It is located directly
above the blower partition. Relay contacts (NO) are
provided for the DDC controls option that indicates the
indoor blower assembly needs to be serviced.
Compressor Current Sensor
The compressor current sensor indicates when the
compressor is operational by measuring amp draw. It is
located inside the unit control panel. Relay contacts (NO)
are provided to indicate the compressor is not operating
See Table 4 for low voltage connections for DDC control.
Part Number
8403-060
3 stage Cool; 3 stage Heat; Electronic Programmable/Non-Programmable; HP or Conventional; Auto or Manual
(1120-445)
changeover; Dehumidification Output
3 stage Cool, 3 stage Heat; Programmable/Non-Programmable; HP or Conventional; Auto or Manual Changeover;
CS9B-THOA
Humidity Sensor w/ dehumidification; Motion Sensor w/Intelligent Learning Control; BACnet-compatible
3 stage Cool, 3 stage Heat; Programmable/Non-Programmable; HP or Conventional; Auto or Manual Changeover;
CS9B-THOCA
Humidity Sensor w/ dehumidification; CO
3 stage Cool, 3 stage Heat; Programmable/Non-Programmable; HP or Conventional; Auto or Manual Changeover; Humidity
CS9BE-THOA
Sensor w/ dehumidification; Motion Sensor w/Intelligent Learning Control; BACnet-compatible; Ethernet-compatible
3 stage Cool, 3 stage Heat; Programmable/Non-Programmable; HP or Conventional; Auto or Manual Changeover;
CS9BE-THOCA
Humidity Sensor w/dehumidification; CO
Ethernet-compatible
8403-089
1 stage Cool, 1 stage Heat – Heat Pump; 1 stage Cool, 1 stage Heat – Conventional; Programmable/Non-
(T4 Pro)
Programmable Electronic; Auto or Manual changeover
8403-090
2 stage Cool, 3 stage Heat – Heat Pump; 2 stage Cool, 2 stage Heat – Conventional; Programmable/Non-
(T6 Pro)
Programmable Electronic; Auto or Manual changeover
8403-091
1 stage Cool, 1 stage Heat; Non-Programmable; FEMA use
8403-092
2 stage Cool, 3 stage Heat – Heat Pump; 2 stage Cool, 2 stage Heat – Conventional; Programmable/Non-
(T6 Pro Wi-Fi)
Programmable Electronic; Auto or Manual changeover; Wi-Fi
Manual 2100-689J
Page
18 of 42
Low Voltage Connections for DDC Control
Fan Only
1st Stage
Cooling Mode/
Balanced Climate
2nd Stage
Cooling Mode
1st Stage Heating
2nd Stage Heating
(if employed)
Ventilation
Dehumidification
(if employed)
TABLE 5
Wall Thermostats
Predominate Features
Sensor; Motion Sensor w/Intelligent Learning Control; BACnet-compatible
2
Sensor; Motion Sensor w/Intelligent Learning Control; BACnet-compatible;
2
TABLE 4
Units w/
Standard Units
Economizers
Energize G
Energize G
Energize Y1, G
Energize Y1, G
Energize Y2 to
overide Balanced
Climate mode
Energize Y1, Y2, G
when Y1-Y2
jumper is
removed
Energize B/W1
Energize B/W1
Energize B/W1, W2
Energize B/W1, W2
Energize A
Energize A
Energize D
Energize D
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