Manual 2100-403
Page 11
WIRING — MAIN POWER
Refer to the unit rating plate for wire sizing
information and maximum fuse or “HACR" type
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 (75ºC
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 “HACR" type 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 information on three phase
scroll compressor start-ups.
WIRING — LOW VOLTAGE WIRING
230/208V, 1 phase and 3 phase equipment 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:
Nine (9) wires should be run from thermostat subbase to
the 24V terminal board in the unit. A nine conductor, 18
gauge copper, color-coded thermostat cable is
recommended. The connection points are shown in
Figures 7 and 8.
LOW VOLTAGE CONNECTIONS
These units use a grounded 24 volt AC low voltage
circuit.
The
"R"
terminal is the
hot
terminal and the
"C"
terminal is
grounded
.
"G"
terminal is the
fan input
.
"Y"
terminal is the
compressor input for cooling
.
"B"
terminal is the
reversing valve input
. The reversing
valve must be energized for heating mode.
"R"
terminal is
24 VAC hot
.
"C"
terminal is
24 VAC grounded
.
"L"
terminal is
compressor lockout
output
. This
terminal is activated on a high or low pressure trip by
the electronic heat pump control. This is a 24 VAC
output.
"W2
" terminal is
second stage heat
(if equipped).
"01"
terminal is the
ventilation input
. This terminal
energizes any factory installed ventilation option.
"E"
terminal is the e
mergency heat input
. This terminal
energizes the emergency heat relay.
"W3"
terminal is the 24
dehumidification circuit
.
"W1"
terminal is the
compressor input of heat pump
heating
.
NOTE: for total and proper control using DDC, a
total of 8 controlled outputs are required (7 if
no ventilation system is installed). For proper
system operation under Emergency Heat
conditions where the compressor needs to be
deactivated, the B-W2-E outputs need to be
energized. Removing the W1 (compressor)
signal alone turns the compressor off, but does
not activate the additional circuitry embedded
in the heat pump for proper and complete
operation.
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).
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