Manual 2100-703
Page
15 of 40
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 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 page 21 for important information on three phase
scroll compressor start ups.
See Table 13 on page 32 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 low voltage wiring, an 18 gauge copper, color-coded
cable is recommended. See Table 7 on page 17 for
more information.
Low Voltage Connections
These units use a 24-volt AC low voltage circuit.
C
terminal is
24VAC common and is grounded
.
G
terminal is the
indoor blower input
.
Y1
terminal is the
1st Stage input for cooling.
Y2
terminal is the
2nd Stage compressor input for
cooling (if equipped with an economizer).
B/W1
terminal is the
reversing valve input.
The
reversing valve must be energized for heating mode.
W2
terminal is the
1st stage electric heat
(if equipped).
W3
terminal is the
2nd stage of electric heat
or
emergency heat input
(if equipped).
This is not
applicable on units with dehumidification.
A
terminal is the
ventilation input
. This terminal
energizes any factory-installed ventilation option and
indoor blower.
D
terminal is the dehumidification input. If installed, this
terminal energizes any factory-installed dehumidification
option.
L
terminal is
24 volt alarm active output
.
For units equipped with an alarm relay:
1 terminal
is the
normally closed contact on the relay.
2 terminal
is the
normally open contact on the relay.
3 terminal
is the
common contact on the relay.
DDC Connections
11
terminal is
filter switch, common contact
on
auxiliary terminal strip
(F Control option only)
12
terminal is
filter switch, normally open contact
on
auxiliary terminal strip
(F Control option only)
Unit Shutdown Feature (Standard on All Models)
The RT terminal is the 24VAC transformer output,
and the R 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
shutdown of the equipment upon activation.
Balanced Climate™ Feature (Standard on All Models)
All units are equipped with the capability of running
in Balanced Climate mode. This mode is designed to
enhance the comfort level by reducing the indoor airflow
amount and extending the run time to help extract
more humidity during cooling operation. In heating
mode, the reduced airflow provides a warmer supply
air temperature creating more comfortable heat. The
Y1 terminal is the 24VAC input for Balanced Climate
compressor cooling operation. The Y2 terminal is the
24VAC input for compressor cooling standard operation.
Y1 and Y2 are connected with a brass jumper bar which
can be removed to enable Balanced Climate mode.
