Carrier 39L Series Installation, Operation, And Start-Up Instructions page 66

Central station air-handling units with product integrated controls (pic)
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LEGEND
AHU
— Air Handling Unit
CUST — Condensing Unit Status
DSIO — Relay Module
DX
— Direct Expansion
OAT
— Outdoor Air Thermostat
PIC
— Product Integrated Control
Factory Wiring
Field Wiring
Fig. 70 — Outdoor Air Thermostat/DSIO Wiring
66

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