•35% annual leak rate of commercial and industrial refrigeration

•15% annual leak rate comfort cooling chillers and all other equipment

R407c Considerations

R407c equipment for leak detection are the same as R410a. However, the technician CANNOT use the exist- ing refrigerant in the system after leaks have occurred. There can be a significant change in the refrigerant com- position during multiple leaks and recharges. Unit should be recharged using the manufacturer's recommended charge. However the service technician must remember that when adding R407c to the system, it must come out of the charging cylinder as a liquid to avoid fractionation and for optimum system performance

Refrigerant Recovery

Use an R410a approved recovery device. Due to the increased pressure of R410a, recovery equipment has been redesigned to handle these higher pressures. Recov- ery equipment rated for R410a must be used. Recovery cylinders must have a service pressure rating of 400 psig (DOT 4BA 400 and DOT 4BW 400 are acceptable). DO

NOT USE STANDARD DOT RECOVERY OR STOR- AGE CYLINDERS WITH A 300 PSIG RATING WITH R410A! As stated earlier, a specific gauge set for use with R410a is required. These will allow pressure measure- ments to 800 psig on the high side and 250 psig on the low side. Hoses should have a service rating of 800 psig.

Figure 2. Triple Vacuum Procedure

R410a Application and Service Guide

Evacuation

Heat Controller recommends two evacuation methods, the deep vacuum method and the “Triple Vac” method.

The Deep Vacuum Method

The deep vacuum method requires a vacuum pump ca- pable of at least a 500 micron vacuum and a micron gauge capable of measuring this vacuum. The deep vacuum method is the most positive way of assuring a system is free of air and moisture and is the recommended method.

Triple Vacuum Method

The triple evacuation method should only be used when the vacuum pump is not capable of pulling a 500 micron vacuum. See Figure 2.

Figure 3. Vacuum and Time

The following is the Triple Evacuation procedure:

1.The unit should be evacuated to at least 29.72 in. Hg.

2.Break the vacuum with dry nitrogen and wait 1 hour.

3.Evacuate until at least 29.72 in. Hg. is reached and then continue for 15 minutes.

4.Break the vacuum with dry nitrogen and wait 1 hour.

5.Evacuate until at least 29.72 in. Hg. is reached and then continue for 20 minutes.

6.Isolate and Turn Vacuum Pump Off and wait. Vacuum measurement should stay low and not rise above 29.5 in. Hg. A rise above 29.5 in. Hg indicates a leak or moisture in system.

Refrigerant Charging

An undercharged TXV unit can be identified by:

•Low evaporating pressure

•High superheat

•Low subcooling

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Heat Controller R410A manual R407c Considerations, Refrigerant Recovery, Evacuation, Refrigerant Charging
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R410A specifications

The heat controller R410A is a modern refrigerant that has gained significant popularity in recent years, particularly in air conditioning systems and heat pumps. As an environmentally friendlier alternative to older refrigerants, R410A is primarily composed of a blend of two hydrofluorocarbons (HFCs): R-32 and R-125. This combination offers several advantages, making it a preferred choice for both residential and commercial heating and cooling applications.

One of the main features of R410A is its high efficiency. This refrigerant operates at higher pressures than traditional refrigerants like R22. As a result, systems designed to use R410A can achieve higher cooling capacities and overall energy efficiency. This leads to better performance and lower energy consumption, which is beneficial not only for the environment but also for consumers seeking to reduce energy bills.

Additionally, R410A is designed to have a significantly lower ozone depletion potential (ODP) compared to older refrigerants. It has an ODP of zero, meaning it does not contribute to the depletion of the ozone layer, aligning with global efforts to protect the environment. Furthermore, R410A has a lower global warming potential (GWP) than many traditional refrigerants, which further enhances its reputation as an eco-friendly refrigerant option.

When it comes to technologies, R410A has been integrated into various heat pump and air conditioning systems, many of which utilize advanced inverter technology. This technology allows the compressor to adjust its speed according to the cooling or heating demand, optimizing energy consumption and enhancing comfort levels. Additionally, systems using R410A are often equipped with enhanced heat exchange surfaces, allowing for better heat transfer and overall system efficiency.

Another characteristic of R410A is its compatibility with modern lubricants, which improves system performance and reliability. These lubricants are specifically formulated to work effectively with R410A, ensuring that systems maintain optimal efficiency throughout their operational lifespan.

In summary, the heat controller R410A boasts a range of features, technologies, and characteristics that make it a leading choice in the HVAC industry. With its high efficiency, low environmental impact, and compatibility with advanced systems, R410A continues to play a pivotal role in modern heating and cooling solutions. As the industry moves toward greener alternatives, R410A stands out as a viable refrigerant option for the future.
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