No.

Label

Type

Description

1

+

RS485 Modbus A

Line A

2

−

RS485 Modbus B

Line B

3

GND_ISO

Earth ground

4

MAT

Type II NTC 10K or 0-10 Vdc

Mixed or Discharge Air Temperature Sensor

5

COM

COM

Mixed or Discharge Air Temperature Sensor Common

6

OAT

Type II NTC 10K or 0-10 Vdc

Outside Air Temperature Sensor

7

OAH

0-10 Vdc or 4-20 mA

Outside Air Relative Humidity Sensor

8

COM

COM

Outside Air Temperature Sensor or Outside Air Relative Humidity Sensor Common

9

AUX-AI

0-10 Vdc, 2-10 Vdc or 0-5 Vdc

Air Quality Sensor or Pressure Sensor

10

RAT

Type II NTC 10K or 0-10 Vdc

Return Air Temperature Sensor

11

RAH

0-10 Vdc or 4-20 mA

Return Air Relative Humidity Sensor

12

S-COM

COM

24 Vac Common

13

S-24V

24 Vac

24 Vac Power out to sensors

14

VFD 0-10

0-10 Vdc

Variable-Speed Supply Fan Output

15

COM

COM

Variable-Speed Fan Output Common

16

ACT-FB

2-10 Vdc

Damper Actuator Feedback

17

ACT2-10

2-10 Vdc

Damper Actuator Output

18

ACT-COM

COM

Damper Actuator Output Common

19

ACT-24V

24 Vac

24 Vac Power out to Damper Actuator

20

AUX2-O

24 Vac OUT

Configurable:

  • Cooling Stage 3 Output
  • Exhaust Fan (1 or 2)
  • VFD On/Off (Variable Speed Supply Fan Enable or Disable)
  • ERV
  • System Alarm output (Title 24)

21

COM

COM

24 Vac Common

22

AUX2-I

24 Vac IN

Configurable:

  • Cooling Stage 3 Input
  • Shut Down
  • Heat Conventional (W1)
  • Heat Pump Changeover (reversing valve O/B, HP(B)/HP(O))
  • Preoccupancy

23

AUX1-O

24 Vac OUT

Configurable:

  • Cooling Stage 3 Output
  • Exhaust Fan (1 or 2)
  • VFD On/Off (Variable Speed Supply Fan Enable or Disable)
  • ERV
  • System Alarm output (Title 24)

24

COM

COM

24 Vac Common

25

AUX1-I

24 Vac IN

Configurable:

  • Cooling Stage 3 Input
  • Shut Down
  • Heat Conventional (W1)
  • Heat Pump Changeover (reversing valve O/B, HP(B)/HP(O))
  • Preoccupancy

26

OCC

24 Vac IN

Occupancy input

  • T-STAT
  • ALWAYS

27

Y2O

24 Vac OUT

Cooling Stage 2 Output to stage 2 mechanical cooling

28

Y2I

24 Vac IN

Cooling Stage 2 Input from commercial thermostat

29

Y1O

24 Vac OUT

Cooling Stage 1 Output to stage 1 mechanical cooling

30

Y1I

24 Vac IN

Cooling Stage 1 Input from commercial thermostat

31

C

COM

24 Vac Common

32

R

24 Vac

24 Vac Power