Carrier 48EJ Gas Heater User Manual


 
Tables 24-26 show the input and output channel
designations.
Table 24 I/O Channel Designations Base Module CV
TERMINAL NO. ASSIGNMENT TERMINAL NO. ASSIGNMENT
T1-2 SPT (CCN) 10K Thermistor T23-25 Compressor 2 Safety DI (24 vac)
T3-4 STO (CCN) 10K Thermistor T24-25 Outside Air Enthalpy DI (24 vac)
T5-6 OAT 5K Thermistor T26-27 Economizer Pos. AO (4-20 mA)
T7-8 SAT 5K 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 T33-32 CV Power Exhaust2—DO(115vac)
T15-16 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 25 I/O Channel Designations Base Module VAV
TERMINAL NO. ASSIGNMENT TERMINAL NO. ASSIGNMENT
T1-2 SPT (CCN) 10K Thermistor T23-25 Compressor 2 Safety DI (24 vac)
T3-4 RAT 5K Thermistor T24-25 Outside Air Enthalpy DI (24 vac)
T5-6 OAT 5K Thermistor T26-27 Economizer Pos. AO (4-20 mA)
T7-8 SAT 5K Thermistor T28-29 Heat 1 Relay DO (24 vac)
T9-10 T30-29 Heat Interlock Relay DO (24 vac)
T11-12 SAT Reset AI (4 to 20 mA) T31-32 Modulated Power Exhaust DO (115 vac)
T13-14 T33-32
T15-16 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 Unloader1—DO(115vac)
T19-25 T39-38 Unloader2—DO(115vac)
T20-25 K1 Indoor Fan Relay DO (LV)
T21-25 K2 Compr. 1 (HV)
T22-25 Compressor 1 Safety DI (24 vac) K3 Compr.2—DO(HV)
Table 26 I/O Channel Designations Expansion Module (Field-Installed) CV and VAV
TERMINAL NO. ASSIGNMENT TERMINAL NO. ASSIGNMENT
T1-2 T23-25 Fire Evacuation DI (24 vac)
T3-4 T24-25 Fire Smoke Purge DI (24 vac)
T5-6 T26-27
T7-8 T28-29
T9-10 T30-29 Alarm Light Indicator DO (24 vac)
T11-12 IAQ Indoor AI (4 to 20 mA) T31-32 Power Exhaust Fire No.1—DO(115vac)
T13-14 IAQ Outdoor — AI (4 to 20 mA) T33-32 Power Exhaust Fire No.2—DO(115vac)
T15-16 T34-35 Power Exhaust Fire No.3—DO(115vac)
T17-25 Fan Status DI (24 vac) T36-35 Power Exhaust Fire No.4—DO(115vac)
T18-25 Filter Status DI (24 vac) T37-38
T19-25 Field Applied Status DI (24 vac) T39-38
T20-25 Demand Limit DI (24 vac) K1
T21-25 Fire Unit Shutdown DI (24 vac) K2
T22-25 Fire Pressurization DI (24 vac) K3
LEGEND (Tables 24-26)
AI Analog Input
AO Analog Output
CCN Carrier Comfort Network
CV Constant Volume
DI Direct Input
DO Direct Output
HV High Voltage
IAQ Indoor Air Quality
K Kilo-Ohms
LV Low Voltage
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
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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