Anti Short Cycle Timer Test

The 3 minute time delay feature can be bypassed by shorting the “TEST” pins together.

Heating Mode

When the “TEST” pins are shorted together for more than 1 second, the control will switch between defrost mode and heating mode as described in the Defrost Test Procedure section (page 12).

Cooling Mode

When the ‘TEST” pins are shorted together for more than 1 second, the Anti Short Cycle Timer will be bypassed.

ADJUSTMENT OF REFRIGERANT

CHARGE:

CAUTION:

This heat pump contains liquid and gaseous refrigerant under pressure.Adjustmentofrefrigerant charge should only be attempted by qualiﬁed, trained personnel thoroughly familiar with the equipment and safe responsible refrigerant handling procedures. Under no circumstances should the homeowner attempt to install and/or service this equipment. Failure to comply with this warning could result in equipment damage, personal injury, or death.

NOTE: The unit must be charged while both ﬁ rst and second stages are operating.

NOTE: To achieve rated capacity and efﬁ ciency the compressor must be exposed to refrigerant for at least 24 hours prior to running and then must be run for a minimum of 12 hours.See Refrigerant Charging Charts (Figures 11 - 14, pages 14 & 15) for Charging in Cooling Mode.

Charging an R-410A Unit in AC Mode with Outdoor Temperatures Above 65F.

1.With the system operating at steady-state, measure the liquid refrigerant pressure in psig at the service valve.

2.Measure the liquid refrigerant temperature (° F) at the service valve.

3.For the temperature measured, determine the required liquid refrigerant pressure from the appropriate charging charts.

•If the pressure measured in step 1 is greater than the required liquid refrigerant pressure

determined in step 4, then there is too much charge in the system. Remove refrigerant and repeat steps 1 through 3 until the system is correctly charged.

•If the pressure measured in step 1 is less than the required liquid refrigerant pressure determined in step 4, then there is too little charge in the system. Add refrigerant and repeat steps 1 through 3 until the system is correctly charged.

Charging an R-410A Unit in Heating Mode.

1.Evacuate the refrigerant system.

2.Weigh in the proper charge as shown on the unit rating plate and use the Heating Charging Tables (pages 16 & 17) as a guide. Tables reﬂect conditions at high speed operation.Unit charge MUST be veriﬁ ed in cooling season.

3.Verify the unit is operating properly according to the heating functional checkout on page 12.

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.