Table 14 — I/O Channel Designations Base Module
TERMINAL
NO.
ASSIGNMENT
T1-2 —
T3-4 —
T5-6 OAT — 5K⍀ Thermistor
T7-8 SAT — 5K⍀ Thermistor
T9-10 —
T11-12 —
T13-14 —
T15-16 —
T17-25 Y1 — 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
AO — Analog Output
CV — Constant Volume
DI — Direct Input
DO — Direct Output
HV — High Voltage
K⍀ — Kilo Ohms
OAT — Outdoor Air Thermistor
OFC — Outdoor (Condenser) Fan Contactor
SAT — Supply Air Thermistor
T—Terminal
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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