Tables 24-26 show the input and output channel designations.

Table 24 Ð I/O Channel Designations Base Module Ð CV

TERMINAL NO.

ASSIGNMENT

TERMINAL NO.

 

ASSIGNMENT

T1-2

SPT (CCN) Ð 10K V Thermistor

T23-25

Compressor 2 Safety Ð DI (24 vac)

T3-4

STO (CCN) Ð 10K V Thermistor

T24-25

Outside Air Enthalpy Ð DI (24 vac)

T5-6

OAT Ð 5K V Thermistor

T26-27

Economizer Pos. Ð AO (4-20 mA)

T7-8

SAT Ð 5K V Thermistor

T28-29

Heat 1 Relay Ð DO (24 vac)

T9-10

Ð

T30-29

Heat 2 Relay Ð DO (24 vac)

T11-12

SAT Reset Ð AI (4 to 20 mA)

T31-32

CV Power Exhaust 1/Modulating Power Exhaust Ð DO (115 vac)

T13-14

Ð

T33-32

CV Power Exhaust 2 Ð DO (115 vac)

T15-16

Ð

T34-35

Condenser Fan Ð DO (115 vac)

T17-25

Y1 or Remote Start/Stop Ð DI (24 vac)

T36-35

OFC2 Ð DO (115 vac)

T18-25

Y2 Ð DI (24 vac)

T37-38

 

Ð

T19-25

W1 Ð DI (24 vac)

T39-38

 

Ð

T20-25

W2 Ð DI (24 vac)

K1

Indoor Fan Relay Ð DO (LV)

T21-25

G Ð DI (24 vac)

K2

Compr. 1 Ð DO

(HV)

T22-25

Compressor 1 Safety Ð DI (24 vac)

K3

Compr. 2 Ð DO

(HV)

 

 

 

 

 

Table 25 Ð I/O Channel Designations Base Module Ð VAV

TERMINAL NO.

ASSIGNMENT

TERMINAL NO.

ASSIGNMENT

T1-2

SPT (CCN) Ð 10K V Thermistor

T23-25

Compressor 2 Safety Ð DI (24 vac)

T3-4

RAT Ð 5K V Thermistor

T24-25

Outside Air Enthalpy Ð DI (24 vac)

T5-6

OAT Ð 5K V Thermistor

T26-27

Economizer Pos. Ð AO (4-20 mA)

T7-8

SAT Ð 5K V Thermistor

T28-29

Heat 1 Relay − DO (24 vac)

T9-10

Ð

T30-29

Heat Interlock Relay Ð DO (24 vac)

T11-12

SAT Reset Ð AI (4 to 20 mA)

T31-32

Modulated Power Exhaust Ð DO (115 vac)

T13-14

Ð

T33-32

Ð

 

T15-16

Ð

T34-35

Condenser Fan Ð DO (115 vac)

T17-25

Remote Start/Stop Ð DI (24 vac)

T36-35

OFC2 Ð DO (115 vac)

 

T18-25

Ð

T37-38

Unloader 1 Ð DO (115

vac)

T19-25

Ð

T39-38

Unloader 2 Ð DO (115

vac)

T20-25

Ð

K1

Indoor Fan Relay Ð DO (LV)

T21-25

Ð

K2

Compr. 1 (HV)

 

T22-25

Compressor 1 Safety Ð DI (24 vac)

K3

Compr. 2 Ð DO (HV)

 

Table 26 Ð I/O Channel Designations Expansion Module (Field-Installed) Ð CV and VAV

TERMINAL NO.

ASSIGNMENT

TERMINAL NO.

ASSIGNMENT

 

T1-2

Ð

T23-25

Fire Ð Evacuation Ð DI (24 vac)

 

T3-4

Ð

T24-25

Fire Ð Smoke Purge Ð DI (24 vac)

 

T5-6

Ð

T26-27

Ð

 

T7-8

Ð

T28-29

Ð

 

T9-10

Ð

T30-29

Alarm Light Indicator Ð DO (24 vac)

 

T11-12

IAQ Indoor Ð AI (4 to 20 mA)

T31-32

Power Exhaust Fire No. 1 Ð DO (115

vac)

T13-14

IAQ Outdoor Ð AI (4 to 20 mA)

T33-32

Power Exhaust Fire No. 2 Ð DO (115

vac)

T15-16

Ð

T34-35

Power Exhaust Fire No. 3 Ð DO (115

vac)

T17-25

Fan Status Ð DI (24 vac)

T36-35

Power Exhaust Fire No. 4 Ð DO (115

vac)

T18-25

Filter Status − DI (24 vac)

T37-38

Ð

 

T19-25

Field Applied Status Ð DI (24 vac)

T39-38

Ð

 

T20-25

Demand Limit Ð DI (24 vac)

K1

Ð

 

T21-25

Fire Ð Unit Shutdown Ð DI (24 vac)

K2

Ð

 

T22-25

Fire Ð Pressurization Ð DI (24 vac)

K3

Ð

 

 

LEGEND (Tables 24-26)

KV

Ð Kilo-Ohms

AI

Ð Analog Input

LV

Ð Low Voltage

AO

Ð Analog Output

OAT Ð Outdoor-Air Temperature

CCN Ð Carrier Comfort Network

OFC Ð Outdoor Fan Contactor

CV

Ð Constant Volume

RAT

Ð Return-Air Temperature

DI

Ð Direct Input

SAT

Ð Supply-Air Temperature

DO

Ð Direct Output

SPT

Ð Space Temperature

HV

Ð High Voltage

STO

Ð Space Temperature Offset

IAQ

Ð Indoor Air Quality

T

Ð Terminal

 

 

VAV

Ð Variable Air Volume

NOTE: For 4 to 20 mA signals, all even numbered terminals are negative (−) polarity, and all odd numbered terminals are positive (+) polarity.

61

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Carrier EW I/O Channel Designations Base Module Ð CV, I/O Channel Designations Base Module Ð VAV, Terminal no Assignment

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