27
Fig. 29 — Typical Main Power Connections
POWER WIRING
All power wiring must comply with applicable local and national
codes. A fused disconnect is supplied in the control panel with an
external handle on all 09FC models.
General Wiring Notes:
1. The control circuit does NOT require a separate power
source. Control circuit power is obtained by a step-down
transformer from the main three-phase power supply. The
LVT (low voltage terminal) strip is provided for field-wired
control devices.
2. All field power enters the unit through a hole located in the
bottom of the control box shelf. Refer to Fig. 25 for field wir-
ing details. Refer to Fig. 5-11 for exact location of field power
entry. Be sure to seal entering power wire conduit per NEC
requirements.
3. Maximum field wire sizes allowed by lugs on fused discon-
nect are listed in Table 4.
4. Terminals for field power supply are suitable for copper con-
ductors. Insulation must be rated 75°C minimum.
Control power is obtained from the main power supply and does
NOT require a separate source. A toggle switch, SW1 (marked
LEGEND
AO — Analog Output (0-10 Vdc)
ALM — Alarm Relay
BO — Digital Output (Relay, 1A Max)
BMS — Building Management 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
POWER
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