Nordyne R-410A Connecting the Return and Supply Air Flexible Ducts, Blower Speed, High Voltage

Note: For highly resistive duct systems it may be necessary to add an additional return air duct and or supply to achieve maximum performance and prevent coil icing and refrigerant fl ood back.

Connecting the Return and Supply Air Flexible Ducts

•The return duct for all units is 14” diameter.

•The supply duct for all units is 12” diameter.

•The fl exible ducts can be connected to the corresponding fittings with the clamps provided with the ducts. Note: To prevent a loss in cooling capacity, make sure all connections are tight.

•The fl exible ducts may be cut to the required length, see instructions packed with duct.Keep all ducts as short and straight as possible. Avoid sharp bends.

•Ducts may be spliced with sheet metal sleeves and clamps.

•Once the inner duct is connected to the proper fi tting, the insulation and plastic sleeve should be pulled over the connection and clamped.

•Homes with multiple supply ducts (or special applications), a Y fi tting is available to divide the supply air so it can be ducted to different areas of the home for more effi cient cooling. Note: For maximum performance, insulate the Y fi tting.

Blower Speed

For optimum system performance and comfort, it may be necessary to change the factory speed setting.SeeTable 2 (page 10) for factory settings. NOTE:Q5RE models have High Efficiency Motors with 5 speed taps.

WARNING:

To avoid electric shock, personal injury,or death,turn off the electric poweratthedisconnectorthemain service panel before making any electrical connections.

1.Disconnect all electrical power to the unit and remove the service panel.

CAUTION:

Labelallwirespriortodisconnection when servicing controls. Wiring errors can cause improper and dangerous operation.Verify proper operation after servicing.

2.Locate the orange, black and red wires terminated to the blower motor. The orange wire controls the low speed cooling and heating operations, the black wire controls high speed cooling and heating operations and the red wire controls the electric heating operation.

CAUTION:

To avoid personal injury or property damage, make certain that the motor leads cannot come into contact with any metal components of the unit.

3.Verify the required speed from the airflow data found inTable 2.Place appropriate wire on the appropriate motor speed tap for the required airfl ow.

4.Check all factory wiring per the unit wiring diagram and inspect the factory wiring connections to be sure none loosened during shipping or installation.

ELECTRICAL CONNECTIONS

WARNING:

To avoid electric shock, personal injury,or death,turn off the electric power at the disconnect or the main service panel before making any electrical connections.

High Voltage

1.Install a branch circuit disconnect of adequate size as specifi ed by the National Electrical Code. Locate the disconnect within sight of the unit.

2.Extend leads through power wiring hole (Figure 9). Connect L1 and L2 directly to the contactor.

3.Ground the heat pump unit using the green grounding screw provided in the control panel.

Low Voltage

1.Route 24V control wires through the sealing grommet (Figure 8) near the power entrance.

2.Connect the control wires to the defrost board and blower relay wire (Figure 9, page 10).

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