Manual 2100-588A
Page 14 of 29
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 (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 “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 important information on
three phase scroll compressor start ups.
See Tables 5 & 6 for Electrical Specifications.
WIRING – LOW VOLTAGE WIRING
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).
An 18 gauge copper, color-coded thermostat cable is
recommended. The connection points are shown in this
Manual. See Table below.
Low Voltage Connection
These units use a 24-volt AC low voltage circuit. The
“
RT
” terminal is the 24V transformer output, and the
“
R
” terminal is the 24VAC
hot
terminal for the operation
of the equipment. “
RT
” and “
R
” are connected with
brass jumper bar which can be removed and “
RT
” and
“
R
” connected to external NC (normally closed) contact
such as a fire/smoke detector that will cause immediate
shutdown of the equipment upon activation.
“
C
” terminal is
grounded
.
“
G
” terminal is the
fan input
.
“
Y
” terminal is the
compressor input for cooling
.
“
W1
” terminal is the
1st stage electric heat
.
“
W2
” terminal is the
2nd stage heat
(if equipped).
“
A
” terminal is the
ventilation input
. This terminal
energizes any factory installed ventilation option. See
Table 14 for options.
NOTE: Models with “J” Control Module, “3”
terminal is used along with “1” and “2” for the alarm
relay.
LOW VOLTAGE CONNECTIONS
FOR DDC CONTROL
Fan Only
Energize G
Cooling Mode
Energize Y, G
1st Stage Heating
Energize W1
2nd Stage Heating
(if employed)
Energize W1, W2
Ventilation
Energize G, A