Manual 2100-547J
Page
12 of 26
Wiring – Main Power
Refer to the unit rating plate 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 lists 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 size must be used for proper
circuit protection and also to assure that there will
be no nuisance tripping due to the momentary high
starting current of the compressor motor.
The disconnect access door on this unit may be locked
to prevent unauthorized access to the disconnect. To
convert for the locking capability, bend the tab located
in the bottom left-hand corner of the disconnect
opening under the disconnect access panel straight
out. This tab will now line up with the slot in the door.
When shut, a padlock may be placed through the hole
in the tab preventing entry.
See
Three Phase Scroll Compressor Start Up
Information
on page 14 for important information on
three phase scroll compressor start ups.
See Tables 6A and 6B (pages 21 and 22) for electrical
specifications.
Wiring – Low Voltage
All 230/208V 1 phase and 3 phase equipment have
dual primary voltage transformers. All equipment leaves
the factory wired on 240V tap. For 208V operation,
reconnect from 240V to 208V tap. The acceptable
operating voltage range for the 240 and 208V taps are:
TAP RANGE
240
253 – 216
208
220 – 187
NOTE:
The voltage should be measured at the field
power connection point in the unit and while
the unit is operating at full load (maximum
amperage operating condition).
For wiring size and connections, refer to Wiring Manual
2100-554.
Optional Outdoor Thermostat
Applications
Since most equipment at the time of manufacture
is not designated for any specific destination of the
country and are installed in areas not approaching the
lower outdoor temperature range, outdoor thermostats
are not factory installed as standard equipment, but
are offered as an option. There are also different
applications for applying outdoor thermostats.
The setpoint of either type of outdoor thermostat
application is variable with geographic region and
sizing of the heating equipment to the individual
structure. Utilization of the heating Application Data,
and the heat loss calculation of the building are useful
in determining the correct set points.
NOTE:
The additional LAB (low ambient bypass) relay
is required to prevent heater operation during
low temperature cooling operation.
