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Tables 46-48 show the input and output channel designations.
Table 46 — I/O Channel Designations Base Module — CV
Table 47 — I/O Channel Designations Base Module — VAV
Table 48 — I/O Channel Designations Expansion Module (Field-Installed) — CV and VAV
LEGEND (Tables 46-48) NOTE: All even numbered terminals are negative (–) polarity and all
odd numbered terminals are positive (+) polarity.
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)
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)
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 —
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