Nordyne R-410A user manual Locating the Thermostat, Speed Outdoor Fan Motor Select Models

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High Voltage

Low Voltage

Figure 8. Power Entry

Overcurrent Protection

Generally, the best fuse or breaker for any heat pump is the smallest size that will permit the equipment to run under normal usage and provide maximum equipment protection. Properly sized fuses and breakers also prevent nuisance trips during unit startup. If a fuse blows or a breaker trips, always determine the reason. Do not arbitrarily install a larger fuse or breaker and do not,in any case,exceed the maximum size listed on the data label of the unit.

Locating the Thermostat

Locate the thermostat away from drafts and slamming doors. The thermostat must not be installed on an outside wall or any other location where its operation may be adversely affected by radiant heat from fi replaces, sunlight, or lighting fi xtures, or convective heat sources such as supply air registers or electrical appliances. Mount on an inside wall approximately fi ve feet from the fl oor.

This heat pump is a two stage Cooling and Heating appliance that requires a 2-stage Cooling/Heating thermostat. The heat-cool thermostat prevents simultaneous operation of the heating and cooling units and is equipped with an ON-AUTO fan mode that allows the home owner to operate the indoor blower when only air circulation is desired.

Connect the low voltage wires to the respective terminals on the thermostat base (Figure 9).See thermostat instruction sheet for more detailed information.

2-Speed Outdoor Fan Motor

(Select Models)

If the unit utilizes a 2-speed condenser fan motor, this motor will operate on low speed when in low cooling/heating, and on high speed when in high cooling/heating.

Low Pressure Switch

The low pressure switch is factory installed and located in the suction line internal to the unit.The switch is designed to protect the compressor if a loss of charge occurs. Under normal conditions, the switch is closed.

If the suction pressure falls below 5 psig, then the switch will open and de-energize the unit.The switch will close again once the suction pressure increases above 20 psig. The low pressure switch interrupts the thermostat inputs to the unit. Note: When the switch opens and then closes, there will be a 3 minute short cycling delay before the unit can energize.

High Pressure Switch

The high pressure switch is factory installed and located in the compressor discharge line internal to the unit.The switch is designed to de- energize the system when very high pressures occur during abnormal conditions.Under normal conditions, the switch is closed.

If the discharge pressure rises above 575 psig, the switch will open and de-energize the unit. The switch will close again once the discharge pressure decreases to 460 psig. The high pressure switch interrupts the thermostat inputs to the unit. Note: When the switch opens and then closes, there will be a 3 minute short cycling delay before the unit can energize.

Defrost Cycle Control

The defrost cycle is controlled by an adaptive demand defrost board which features:

•Adaptive Demand Defrost algorithm.

•4 Field selectable defrost termination temperatures.

•Field selectable delay feature.

•High pressure and low pressure switches.

•Sensing of second stage compressor demand.

•Test/speed up capability.

•Anti short cycle timer (3 minutes) for compressor protection.

•On board diagnostics with fl ashing LED for quicker troubleshooting. See Table 3 (page 11).

The adaptive Demand Defrost controls the defrost cycle in response to an adaptive demand algorithm that uses coil temperature and ambient temperature. It provides user selectable defrost termination temperatures (50° F - 80° F coil temperature).

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Contents USER’s Manual & Installation Instructions System Operation Safety Information User InformationAbout the Heat Pump Pre-Installation Check Warranty InformationGeneral Information Inspecting EquipmentHeat Pump Installation Unit Under the HomeCondensate Drainage Locating and Installing Return AIR Assembly Installing Return Supply AIR FittingsSupply Duct Return DuctTypical Applications Locating and Installing Supply DampersBlower Speed Connecting the Return and Supply Air Flexible DuctsElectrical Connections High VoltageHigh Pressure Switch Low Pressure SwitchLocating the Thermostat Speed Outdoor Fan Motor Select ModelsX24K Motor Speed Air FlowX36K X48KControl Diagnostic Ambient Sensor Mounting Diagnostic Description LED StatusPre-Start Checklist Start-Up ProcedureDefrost Test Procedure Anti Short Cycle Timer Test Adjustment of Refrigerant ChargeCharging an R-410A Unit in Heating Mode Refrigerant Charging Charts for Cooling Mode of Operation Charging Chart for 4 ton Units Refrigerant Charging Tables for Heating Mode of Operation Q5RF-X48K Ton Units Wiring DiagramQ5RF/PPH2RF Series Small Package H/P ¢709064-¤
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R-410A specifications

Nordyne R-410A is a widely recognized refrigerant used in modern air conditioning and heat pump systems, known for its efficiency and environmentally friendly attributes. As a hydrofluorocarbon (HFC) refrigerant, R-410A has become the preferred choice for many manufacturers seeking to meet stringent environmental regulations while providing superior cooling performance.

One of the main features of R-410A is its higher energy efficiency compared to older refrigerants like R-22. This efficiency is primarily attributed to its higher pressure capabilities, which allow for improved heat transfer and reduced energy consumption in residential and commercial systems. As energy costs continue to rise, the use of R-410A in HVAC systems offers a viable solution for reducing utility bills while maintaining optimal comfort levels.

R-410A is also non-ozone-depleting, which sets it apart from many traditional refrigerants. While older refrigerants have been phased out due to their potential harm to the ozone layer, R-410A presents a sustainable alternative that aligns with environmental goals. It features a zero ozone depletion potential (ODP), making it a responsible choice for installations concerned with ecological impact.

In terms of technology, R-410A works effectively in both air conditioning and heat pump systems, providing reliable cooling in hot conditions and heat in colder months. It is compatible with a variety of system designs and can excel in both residential and commercial applications. Moreover, the thermodynamic properties of R-410A ensure consistent and reliable performance, regardless of the external temperature fluctuations.

Another characteristic of R-410A is its ability to operate at lower temperatures, which enhances its versatility. This capability allows for the design of systems that can function efficiently in a wider range of climate conditions. As a result, HVAC technicians and contractors benefit from its reliability and performance, leading to less frequent maintenance and enhanced customer satisfaction.

Lastly, R-410A systems are equipped with advanced components that improve overall functionality. These systems often include variable-speed compressors, which optimize energy use based on cooling demand, and advanced refrigerant management technologies that ensure safe and efficient operation.

In conclusion, Nordyne R-410A stands out as a superior refrigerant due to its energy efficiency, environmental benefits, and adaptability across a range of HVAC applications. As the industry continues to innovate and shift toward sustainable solutions, R-410A remains at the forefront of refrigerant technology, ensuring homeowners and businesses alike enjoy efficient and eco-friendly cooling options.
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