Fig. 28 — Typical Control Field Connections
24V CONTROL
LEGEND
AO — Analog Output (0-10 Vdc)
ALM — Alarm Relay
BO — Digital Output (Relay, 1A Max)
BMS — Building Manangement System
CB — Circuit Breaker
EWT — Entering Water Temperature
FU — Fuse
FM — Fan Motor
GND — Ground
IN — Thermistor or Dry Contact Input
LWT — Leaving Water Temperature
OAT — Outdoor Air Temperature
R1 — CW Valve Relay
R2 — CCW Valve Relay
R3 — FC Enable Relay
R4 — VFD Enable Relay
SW — Switch
TB — Terminal Block
TRAN — Transformer
VFD — Variable Frequency Drive
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