Wiring - Main Power; High Voltage Connections - Bard 11EER WA Series User's Application Manual

Wiring – Main Power
WARNING
!
Electrical shock hazard.
Do not operate this equipment without an earth
ground attached and always disconnect the
remote electric power supplies before servicing.
Electrical shock can result in serious injury or
death.
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).
NOTE: In applications where a field-supplied
transformer is used to step down a higher
incoming voltage, the center leg must be
grounded when high resistance grounding is
used.
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 HIGH OR LOW
VOLTAGE WIRE SHIELD
Manual 2100-692H
Page 18 of 44
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
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 Tables 12A and 12B on pages
33 and 34 list fuse and wire sizes (75°C copper) for
all models including the most commonly used heater
sizes. Also shown are 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 SHIELD
FRONT VIEW
RIGHT SIDE VIEW
WIRE SHIELD
USE CONDUIT
WHEN FIELD WIRES
COME IN THROUGH
THE BACK
MIS-4044A
MIS-4044 A