Manual 2100-752B
Page
20 of 49
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.
FIGURE 20
High Voltage Connections
The electrical data on the serial plate, in the unit
specifications and also in Table 9 on page 37 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
Field wires can enter the cabinet through either a top
or side knock-out on the right. Both entrance points
will utilize the wire channel to direct field wires to the
control panel. Figure 20 shows the entrance points and
wire routing.
MIS-4184
FIELD WIRE ENTRANCE
MIS-4184
CIRCUIT BREAKER
WIRE CHANNEL TO
ROUTE FIELD WIRES
INTO CONTROL PANEL
