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Tables 21-23 show the input and output channel designations.
Table 21 — I/O Channel Designations
Base Module — CV
TERMINAL
NO.
ASSIGNMENT
T1-2 SPT (CCN) — 10K⍀ Thermistor
T3-4 STO (CCN) — 10K⍀ Thermistor
T5-6 OAT — 5K⍀ Thermistor
T7-8 SAT — 5K⍀ Thermistor
T9-10 —
T11-12 SAT Reset — AI (2-10 vdc)
T13-14 —
T15-16 —
T17-25 Y1 or Remote Start/Stop — DI (24 vac)
T18-25 Y2 — DI (24 vac)
T19-25 W1 — DI (24 vac)
T20-25 W2 — DI (24 vac)
T21-25 G — DI (24 vac)
T22-25 Compressor 1 Safety — DI (24 vac)
T23-25 Compressor 2 Safety — DI (24 vac)
T24-25 Outside Air Enthalpy — DI (24 vac)
T26-27 Economizer Pos. — AO (4-20 mA)
T28-29 Heat 1 Relay — DO (24 vac)
T30-29 Heat 2 Relay — DO (24 vac)
T31-32
CV Power Exhaust 1/Modulating Pwr Exht — DO
(115 vac)
T33-32 CV Power Exhaust2—DO(115vac)
T34-35 Condenser Fan — DO (115 vac)
T36-35 OFC2 — DO (115 vac)
T37-38 —
T39-38 —
K1 Indoor Fan Relay — DO (HV)
K2 Compr.1—DO(HV)
K3 Compr.2—DO(HV)
LEGEND
(Tables 21 and 22)
AI — Analog Input
AO — Analog Output
CCN — Carrier Comfort Network
CV — Constant Volume
DI — Direct Input
DO — Direct Output
HV — High Voltage
K⍀ — Kilo-Ohms
OAT — Outdoor-Air Temperature
OFC — Outdoor Fan Contactor
RAT — Return-Air Temperature
SAT — Supply-Air Temperature
SPT — Space Temperature
STO — Space Temperature Offset
T—Terminal
VAV — Variable Air Volume
Table 22 — I/O Channel Designations
Base Module — VAV
TERMINAL
NO.
ASSIGNMENT
T1-2 SPT (CCN) — 10K⍀ Thermistor
T3-4 RAT — 5K⍀ Thermistor
T5-6 OAT — 5K⍀ Thermistor
T7-8 SAT — 5K⍀ Thermistor
T9-10 —
T11-12 SAT Reset — AI (2-10 vdc)
T13-14 —
T15-16 —
T17-25 Remote Start/Stop — DI (24 vac)
T18-25 —
T19-25 —
T20-25 —
T21-25 —
T22-25 Compressor 1 Safety — DI (24 vac)
T23-25 Compressor 2 Safety — DI (24 vac)
T24-25 Outside Air Enthalpy — DI (24 vac)
T26-27 Economizer Pos. — AO (4-20 mA)
T28-29 Heat 1 Relay — DO (115 vac)
T30-29 Heat Interlock Relay — DO (115 vac)
T31-32 Modulated Power Exhaust — DO (115 vac)
T33-32 —
T34-35 Condenser Fan — DO (115 vac)
T36-35 OFC2 — DO (115 vac)
T37-38 Unloader1—DO(115vac)
T39-38 Unloader2—DO(115vac)
K1 Indoor Fan Relay — DO (HV)
K2 Compr.1—DO(HV)
K3 Compr.2—DO(HV)
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