Carrier 50EY User Manual
Page 50
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 Exhaust 2 — DO (115 vac)
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
Unloader 1 — DO (115 vac)
T39-38
Unloader 2 — DO (115 vac)
K1
Indoor Fan Relay — DO (HV)
K2
Compr. 1 — DO (HV)
K3
Compr. 2 — DO (HV)
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