Nordyne R-410A Outdoor Unit Connections, Control Circuit Wiring, Thermostat Connections

•Connect the line-voltage leads to the terminals on the contactor inside the control 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 identifi cation and location of outdoor unit fi eld 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 (ANSI/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. A typical residential installation with a heat pump thermostat and air handler are shown in Figure 2.

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

Grounding

CAUTION:

The unit must have an uninterrupted or unbroken electrical ground to minimize personal injury if an electrical fault should occur.This ground may consist of electrical wire or approved conduit when installed in accordance with national or local codes.

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 3 minute short cycling delay before the outdoor unit will energize. Under normal conditions the switch is closed.

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

		Thermostat
NOTE: Jumper	G	R W2 C E O Y1 Y2 W1 W3
W1 & W2 together
for shorter staging
time.
Y1
W2			R
W1		W2
			OD
O		E	Stat
		C O Y1 Y2
Y/Y2
G
R
C
Air Handler		Heat Pump OD Section

Figure 2. Typical 2 - Stage Heat Pump w/ Optional Outdoor Thermostat and Variable Speed Air Handler

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