Carrier 48AY020-060, 48EW, 48EY024-068, 48AW, 48EK, 48AK, 48AJ, 48EJ specifications

Tables 46-48 show the input and output channel designations.

Table 46 — I/O Channel Designations Base Module — CV

TERMINAL NO.	ASSIGNMENT	TERMINAL NO.	ASSIGNMENT
T1-2	SPT (CCN) — 10KV Thermistor	T23-25	Compressor 2 Safety — DI (24 vac)
T3-4	STO (CCN) — 10KV Thermistor	T24-25	Outside Air Enthalpy — DI (24 vac)
T5-6	OAT — 5KV Thermistor	T26-27	Economizer Pos. — AO (4-20 mA)
T7-8	SAT — 5KV Thermistor	T28-29	Heat 1 Relay — DO (24 vac)
T9-10	—	T30-29	Heat 2 Relay — DO (24 vac)
T11-12	SAT Reset — AI (4 to 20 mA)	T31-32	CV Power Exhaust 1/Modulating Power Exhaust — DO (115 vac)
T13-14	IAQ Indoor — AI (4 to 20 mA)	T33-32	CV Power Exhaust 2 — DO (115 vac)
T15-16	IAQ Outdoor — AI (4 to 20 mA)	T34-35	Condenser Fan — DO (115 vac)
T17-25	Y1 or Remote Start/Stop — DI (24 vac)	T36-35	OFC2 — DO (115 vac)
T18-25	Y2 — DI (24 vac)	T37-38	—
T19-25	W1 — DI (24 vac)	T39-38	—
T20-25	W2 — DI (24 vac)	K1	Indoor Fan Relay — DO (LV)
T21-25	G — DI (24 vac)	K2	Compr. 1 — DO (HV)
T22-25	Compressor 1 Safety — DI (24 vac)	K3	Compr. 2 — DO (HV)

Table 47 — I/O Channel Designations Base Module — VAV

TERMINAL NO.	ASSIGNMENT	TERMINAL NO.	ASSIGNMENT
T1-2	SPT (CCN) — 10KV Thermistor	T23-25	Compressor 2 Safety — DI (24 vac)
T3-4	RAT — 5KV Thermistor	T24-25	Outside Air Enthalpy — DI (24 vac)
T5-6	OAT — 5KV Thermistor	T26-27	Economizer Pos. — AO (4-20 mA)
T7-8	SAT — 5KV Thermistor	T28-29	Heat 1 Relay - DO (24 v)
T9-10	—	T30-29	Heat Interlock Relay — DO (24 v)
T11-12	SAT Reset — AI (4 to 20 mA)	T31-32	Modulated Power Exhaust — DO (24 vac)
T13-14	IAQ Indoor — AI (4 to 20 mA)	T33-32	—
T15-16	IAQ Outdoor — AI (4 to 20 mA)	T34-35	Condenser Fan — DO (115 vac)
T17-25	Remote Start/Stop — DI (24 vac)	T36-35	OFC2 — DO (115 vac)
T18-25	—	T37-38	Unloader 1 — DO (115 vac)
T19-25	—	T39-38	Unloader 2 — DO (115 vac)
T20-25	—	K1	Indoor Fan Relay — DO (LV)
T21-25	—	K2	Compr. 1 — DO (HV)
T22-25	Compressor 1 Safety — DI (24 vac)	K3	Compr. 2 — DO (HV)

Table 48 — I/O Channel Designations Expansion Module (Field-Installed) — CV and VAV

TERMINAL NO.	ASSIGNMENT	TERMINAL NO.	ASSIGNMENT
T1-2	—	T23 and TB2-1	Fire — Evacuation — DI (24 vac)
T3-4	—	T24 and TB2-1	Fire — Smoke Purge — DI (24 vac)
T5-6	—	T26-27	—
T7-8	—	T28-29	—
T9-10	—	T30 and TB2-2	Alarm Light Indicator — DO (24 vac)
T11-12	—	T31	Power Exhaust Fire No. 1 — DO (115 vac)
T13-14	—	T33	Power Exhaust Fire No. 2 — DO (115 vac)
T15-16	—	T34	Power Exhaust Fire No. 3 — DO (115 vac)
T17 and TB2-1	Fan Status — DI (24 vac)	T36	Power Exhaust Fire No. 4 — DO (115 vac)
T18 and TB2-1	Filter Status - DI (24 vac)	T37	—
T19 and TB2-1	Field Applied Status — DI (24 vac)	T39	—
T20 and TB2-1	Demand Limit — DI (24 vac)	K1	—
T21 and TB2-1	Fire — Unit Shutdown — DI (24 vac)	K2	—
T22 and TB2-1	Fire — Pressurization — DI (24 vac)	K3	—

			LEGEND (Tables 46-48)
AI	—	Analog Input	OAT — Outdoor-Air Temperature
AO	—	Analog Output	OFC — Outdoor Fan Contactor
CCN —		Carrier Comfort Network RAT — Return-Air Temperature
CV	—	Constant Volume	SAT — Supply-Air Temperature
DI	—	Direct Input	SPT — Space Temperature
DO	—	Direct Output	STO — Space Temperature Offset
HV	—	High Voltage	T	— Terminal
IAQ —		Indoor Air Quality	TB	— Terminal Block
KV	—	Kilo-Ohms	VAV — Variable Air Volume
LV	—	Low Voltage

NOTE: All even numbered terminals are negative (–) polarity and all odd numbered terminals are positive (+) polarity.

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