Furnace Rating

Orifice Drill Size

 

 

Plate Input (Btu/h)

Nat

LP

 

 

 

45000

44

54

60000

45

55

72000

43

54

96000

43

54

120000

43

54

144000

43

54

Table 9. Natural and LP Gas Orifice Sizes

for Elevations between zero and

4999 ft. Above Sea Level

used in this furnace require an earth ground to operate properly. Acceptable methods for grounding are electrical wire or conduit ap- proved for electrical ground service. Do not use gas piping as an electrical ground.

NOTE: Proper line voltage polarity must be maintained in order for the control system to operate correctly. Verify that the incoming neutral line is connected to the white wire and the incoming "hot" line is connected to the black wire in the furnace junction box. These furnaces will not operate unless po- larity and ground are properly connected. See Figure 23.

!CAUTION:

Label all wires prior to disconnection when servicing controls. Wiring er- rors can cause improper and danger- ous operation. Verify proper opera- tion after servicing.

Furnace Rating

Orifice Drill Size

 

 

Plate Input (Btu/h)

Nat

LP

 

 

 

45000

44

55

60000

45

56

72000

43

55

96000

43

55

120000

43

55

144000

43

55

Table 10. Natural and LP gas Orifice Sizes for Elevations between 5000 and 10,000 ft.

Above Sea Level

nace. See Figure 24 for the proper connections for heating only (two-wire) and heating/cooling (four-wire) applications. The recommended minimum wire gauge for thermostat wiring is shown in Table 11.

The thermostat must not be installed on an outside wall or any other location where its opera- tion may be adversely affected. Adverse affects include radiant loading from fireplaces, sunlight, or lighting fixtures, and convective loading from warm air registers or electrical appliances.

To check the heat anticipator setting either:

1.Add the current draw of the system compo- nents; or

2.Measure the current flow on the thermostat R-W circuit after the circulating blower mo- tor has started.

Set the heat anticipator according to the thermo- stat manufacturer's instructions for heat antici- pator settings.

START-UP AND ADJUSTMENTS

Low Voltage Wiring

Install the thermostat per the manufacturer's instructions. The low voltage (24 volt) connec- tions from the thermostat are made at the terminal strip on the control board in the fur-

Prior to start-up, verify that:

1.The line voltage power leads are securely connected, that the polarity of the connec- tions is correct, and that the furnace is properly grounded.

Field Supplied

Field Supplied

 

Fused Service

 

Panel Connector

 

Panel

 

 

 

 

Black (Hot)

Black

Black

Black

White (Neutral)

White

White

White

Green or Bare

 

 

 

(Ground)

 

Ground

Ground

Ground

 

Field Supplied Disconnect

Within Sight of Furnace

Field Line Voltage Wiring

Factory Line Voltage Wiring

Figure 23. Line Voltage Field Wiring

25

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Nordyne G6RC 90+ START-UP and Adjustments, Low Voltage Wiring, Furnace Rating Orifice Drill Size Plate Input Btu/h Nat