Wiring - Main Power; High Voltage Connections - Bard WA Series User Manual

Wiring – Main Power
Main electrical power must be supplied to the unit
from a clean, reliable power source. Verify voltage being
supplied to the unit is consistent during all times of the
day and within the range specified for the unit in the
unit specifications and on the unit serial plate. Voltage
must be measured at the field power connection point
in the unit and while the unit is operating at full load
(maximum amperage operating condition).
Refer to the unit serial plate and unit specifications
for wire sizing information and maximum fuse or
circuit breaker size. Each outdoor unit is marked with
a "Minimum Circuit Ampacity". This means that the
field wiring used must be sized to carry that amount
of current. Depending on the installed KW of electric
heat, there may be two field power circuits required. If
this is the case, the unit serial plate will so indicate.
All models are suitable only for connection with copper
wire. Each unit and/or wiring diagram will be marked
"Use Copper Conductors Only". These instructions
must be adhered to. Refer to the National Electrical
Code (NEC) for complete current carrying capacity data
on the various insulation grades of wiring material. All
wiring must conform to NEC and all local codes.
The electrical data on the serial plate, in the unit
specifications and also in Table 11 on page 33 list fuse
and wire sizes (75°C copper) for all models including
the most commonly used heater sizes. Also shown are
FIELD HIGH OR LOW
VOLTAGE WIRE SHIELD
FIGURE 19

High Voltage Connections

FIELD HIGH OR LOW
VOLTAGE WIRE SHIELD
FRONT VIEW
USE CONDUIT
WHEN FIELD WIRES
COME IN THROUGH
THE BACK
RIGHT SIDE VIEW
the number of field power circuits required for the
various models with heaters. The unit rating plate lists
a "Maximum Time Delay Relay Fuse" or circuit breaker
that is to be used with the equipment. The correct type
and size must be used for proper circuit protection and
also to ensure that there will be no nuisance tripping
due to the momentary high starting current of the
compressor motor.
Three phase models must have proper phasing. A phase
monitor is included in all three phase models, and will
indicate improper phasing during a call for cooling
(24VAC at Y1 terminal). See provided information
included in this document regarding the phase monitor.
High Voltage Connections
Route field wires under the field wire shield shown in
Figure 19. (The field wire shield can be removed for
wire installation.) If field power is supplied to the left
side of the unit, run the high voltage wires under the
shield and to the right of the wire shield next to the
compressor contactor and up into the upper control
panel where the connections are made. If field power is
supplied to the right of side of the unit, the low voltage
wires can be run under the field wire shield to access
the low voltage terminal strip.
When field wires are supplied through the back of the
unit, flexible conduit must be extended through the
back of the unit and terminate into the knock-outs on
the upper control panel (see Figure 19).
WIRE SHIELD
FRONT VIEW
RIGHT SIDE VIEW
MIS-4044
WIRE SHIELD
USE CONDUIT
WHEN FIELD WIRES
COME IN THROUGH
THE BACK
MIS-4044
MIS-4044
Manual 2100-720C
Page 17 of 42