Diagnostic Description LED Status | Nordyne R-410A instruction

Control is uncalibrated when power is applied. Calibration occurs after a defrost cycle. The control initiates defrost after 34 minutes of accumulated compressor run time in heating with coil temperature below 35° F. The defrost cycle terminates when the coil sensor reaches termination temperature or after 14 minutes. Note: All units are shipped from the factory with the default termination temperature set at 70° F.

Defrost function is disabled if coil temperature is above 35° F. If the ambient sensor is detected as open or shorted, demand defrost will not operate and control will revert to time/temperature defrost operation. If the outdoor coil sensor is detected as open or shorted, the control will not perform demand or time/temperature defrost operation. Note: When the defrost cycle initiates, there will be a 30 second compressor delay going into and out of the defrost cycle. This delay may be removed by removing P6 connector on the board.

This 2-stage unit will defrost in second stage regardless of the stage called for by the thermostat.

	Diagnostic Description	LED Status

	Control Fault (No Power)	Off
	Normal Operation	On

	ASCD Delay Active	1 Flash
	(with compressor demand)	1 Flash
	(with compressor demand)
	Low Pressure Switch Lockout	2 Flashes

	High Pressure Switch Lockout	3 Flashes

	Ambient Sensor Fault	4 Flashes

	Coil Sensor Fault	5 Flashes

Table 3. Control Diagnostic

Ambient Sensor Mounting

For optimum performance of the heat pump system, the ambient sensor (Figure 10) must be mounted on the outside of the unit.

1. Remove the mounting bracket and all hardware included in the packet .

2. R e m ove s t a r bu s h i n g f r o m 7 / 8 ” hole in cor ner panel of the unit .

3.Route the ambient sensor through the 7/8” hole in the corner panel of the unit, and then

through the 7/8” hole in the mounting bracket.

4. R o u t e t h e s e n s o r t h r o u g h t h e star bushing. Use the star bushing to secure the mounting bracket to the unit.

5.Secure the ambient sensor inside the plastic clip and secure it to the mounting bracket with the screw and nut provided.

6.Install one spacer next between the plastic clip and mounting bracket.

7.Bend the mounting bracket into position. Install the mounting bracket to the unit using the screw in the corner panel.

Nut

Bolt

Ambient Sensor

Plastic Clip

Star Bushing

Figure 10. Ambient Sensor Mounting

Electric Heat Package (optional)

This heat pump is shipped without an auxiliary electric heat kit installed.If electric heat is desired, an accessory Heater Kit must be ﬁ eld installed. See Speciﬁ cations Sheet for available kits and their application.

•Select the correct size heat package for the installation.

•Follow installation instructions provided with each heater kit.

•Installation is most easily accomplished before making duct or electrical connections.

•Refer to Table 2 (page 10) for blower speeds.

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.