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, Connect the line-voltage leads to the
terminals on thecontactor i nsidethecontrol
compartment.
.
Use only copper wire for the line voltage power
supply to this unit (Table 1). Use proper code
agency listed conduit and a conduit connector
for connecting
the supply wires to the unit.
Use of rain tight conduit is recommended.
,
See the unit wiring label for proper high and low
voltage wiring. Make all electrical connections
in accordance
with all applicable
codes and
ordinances.
.
Use a separate branch electrical circuit for this
unit. A means of electrical disconnect must be
located within sight of and readily accessible
to the unit. This switch shall be capable of
electrically de-energizing
the outdoor unit.
.
Overcurrent protection must be provided at the
branch circuit distribution panel and sized as
shown on the unit rating label and according
to applicable local codes.
Outdoor
Unit Connections
The outdoor unit requires both power and control
circuit electrical connections.
Refer to the unit
wiring diagram / schematic for identification and
location of outdoor unit field wiring interfaces.
Control
Circuit
Wiring
The outdoor unit is designed to operate from a
24 VAC Class II control circuit. The control circuit
wiring must comply with the current provisions
of the NEC (ANSl/NFPA 70) and with applicable
local codes having jurisdiction.
Thermostat
Connections
Thermostat
connections
should
be made
in
accordance
with the instructions
supplied with
the thermostat, and with the instructions supplied
with the indoor equipment. See Table 2 for proper
wire gauge
and their recommended
lengths
for typical
thermostat
connections.
A typical
residential
installation
with an air conditioner,
thermostat,
and air handler is shown in Figure 2.
Low-Pressure
Switch
A low-pressure
switch is factory installed and
located
internally
on the suction
line of the
outdoor unit.The switch is designed to protect the
compressor from a loss of charge by interrupting
the thermostat
inputs to the unit.
If the suction pressure falls below 5 psig, the
switch will open and de-energize
the outdoor
unit.The switch will close again when the suction
pressure increases above 20 psig. NOTE: When
the switch opens and then closes, there is a 5
minute short cycling delay before the outdoor
unit will energize. Under normal conditions
the
switch is closed.
COPPER WIRE SIZE -- AWG
(1% Voltage Drop)
Supply Wire Length=Feet
Supply
Circuit
200
150
100
50
Ampacity
6
8
10
14
15
4
6
8
12
20
4
6
8
10
25
4
4
6
10
30
3
4
6
8
35
3
4
6
8
40
2
3
4
6
45
2
3
4
6
50
2
3
4
6
55
1
2
3
4
60
Wire Size based on N.E.C.for 60° type copper conductors.
Table 1. Copper Wire Size
NwO1TEndJ Uw_ Per
I Thormos,o,
I
together for
G rR W
Y2
Y1 I
shorter staging
' "i '[ I'
"l x
"1 _ '
J
tim_e"SeeTable
2
i
[
,
..............................................................
_
R
NOTE: in AC applications,
the 0 &Y connection must
A/C
OD Section
be connected
as shown.
Figure 2. Typical
2-Stage Air Conditioner
with Variable Speed Air Handler
Recommended T'STATWire
Thermostat
Length (Unit to T'STAT)
Wire Gauge
2-Wire
5-Wire
(Heating)
(Heating!Cooling)
24
55
25
22
90
45
20
140
70
18
225
110
Table 2. Thermostat Wire Gauge
High-Pressure
Switch
A high-pressure
switch is factory installed and
located internally on the compressor discharge
line of the outdoor unit. If the discharge pressure
rises above 650 psig, the switch will open and
de-energize the outdoor unit.The switch will close
again after the discharge pressure decreases to
460 psig. NOTE: When the switch opens and
then closes, there will be a 3 minute short cycling
deEaybefore the outdoor unit will energize. Under
normal conditions the switch is closed.
9
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