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 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.
Fig. 29 — Typical Main Power Connections
27
POWER
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