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Manual 2100-689

Page

13 of 32

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 ensure 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 “Start Up” section for important information on
three phase scroll compressor start ups.
See Tables 11 and 12 on pages 25 and 26 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: 240

Range: 253 – 216

Tap: 208

Range: 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 low voltage wiring, an 18 gauge copper, color-coded
cable is recommended. See Table 7 on page 14 for
more information.

Low Voltage Connections

These units use a 24-volt AC low voltage circuit. The

terminal is the 24V transformer output, and the

terminal is the 24VAC

hot

terminal for the operation

of the equipment. RT and R are connected with a
brass jumper bar which can be removed and RT and R
connected to an external NC (normally closed) contact
such as a fire/smoke detector that will cause immediate
shutdown of the equipment upon activation.

terminal is the

24VAC common and is grounded.

terminal is the

indoor blower input

terminal is the

1st Stage input for cooling.

terminal is the

2nd Stage compressor input for cooling

(if equipped with an economizer)

disables Balanced

Climate mode if jumper is removed on units without an
economizer (see page 18).

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