Carrier EW, 48EJ, EK, EY024-048 installation instructions

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.

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