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Manual 2100-606B

Page

15 of 30

TABLE 3

Thermostat Wire Size

Low Voltage Connections for DDC Control

Fan Only

Energize G

Cooling Mode

Energize Y, G

Heat Pump Heating

Energize Y, G, B

2nd Stage Heating

Energize G, W2, Y, B

w/Heat Pump (if employed)

Ventilation

Energize G, O1

Emergency Heat

Energize B, W2, E, G

Transformer

FLA

Wire Gauge

Maximum

Distance

in Feet

2.3

20 gauge
18 gauge
16 gauge
14 gauge
12 gauge

45
60

100
160
250

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 “Start Up” section for important information on
three phase scroll compressor start ups.
See Table 9 for Electrical Specifications.

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).

WIRING – LOW VOLTAGE WIRING

230/208V, 1 phase and 3 phase equipment contain
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 240V and
208V taps are:

TABLE 2

Operating Voltage Range

An 18 gauge copper, color-coded thermostat cable is
recommended. The connection points are shown in
this manual (see Table 2).

Low Voltage Connection

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

” terminal is the

hot

terminal and the “

”

terminal is

grounded

“