Heat Controller R-410A Grounding, Thermostat / Low Voltage Connections, Outdoor Fan Motor

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 as listed in 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.

•208/230 Volt units are shipped from the factory wired for 230 volt operation. For 208V operation, remove the lead from the transformer terminal marked 240V and connect it to the terminal marked 208V.

•Optional equipment requiring connection to the power or control circuits must be wired in strict accordance of the NEC (ANSI/NFPA 70), applicable local codes, and the instructions provided with the equipment.

Grounding

WARNING:

The unit cabinet must have an uninterrupted or unbroken electrical ground to minimize personal injury if an electrical fault should occur. Do not use gas piping as an electrical ground!

This unit must be electrically grounded in accordance with local codes or, in the absence of local codes, with the National Electrical Code (ANSI/NFPA 70) or the CSA C22.1 Electrical Code. Use the grounding lug provided in the control box for grounding the unit.

Thermostat / Low Voltage Connections

COPPER WIRE SIZE — AWG

(1% Voltage Drop)

	Supply Wire Length-Feet				Supply Circuit
					Ampacity
200		150	100	50
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

	Recommended T-Stat Wire
Thermostat	Unit to T-Stat (Length in FT)
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

• Thermostat connections should be made in accordance

with the instructions supplied with the thermostat and

the indoor equipment. A typical installation with a heat

pump thermostat and air handler is shown in Figure 2.

• 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.

• The low voltage wires must be properly connected to

the units low voltage terminal block. Recommended

wire gauge and wire lengths for typical thermostat

connections are listed in Table 2.

• The thermostat should be mounted about 5 feet

above the floor on an inside wall. DO NOT install the

thermostat on an outside wall or any other location

where its operation may be adversely affected by radiant

heat from fireplaces, sunlight, or lighting fixtures, and

convective heat from warm air registers or electrical

appliances. Refer to the thermostat manufacturer’s

instruction sheet for detailed mounting and installation

NOTE: Jumper

W1 & W2 together for shorter staging time.

Y1

W2

W1

O

Y/Y2

G R C

Thermostat

G R W2 C E O Y1 Y2 W1 W3

R

W2

OD

E Stat

C O Y1 Y2

information.

Outdoor Fan Motor

If the unit utilizes a 2-speed condenser fan motor, this motor will operate on low speed when in low cooling, and on high speed when in high cooling. A relay within the control area switches the fan motor from low to high speed using the call for high cooling as the trigger. Other models that utilize BLDC fixed torque variable speed fan motors will not require a relay.

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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