R410a Application and Service Guide

An overcharged TXV unit can be identified by:

•High subcooling

•High head pressures

Even though R410a has a very small fractionation po- tential it cannot be ignored completely when charging. To avoid fractionation, charging a system with R410a should be done with LIQUID from the tank to maintain optimum system performance. To ensure the proper blend of refrigerant is used, it is important that liquid only be removed from the storage tank. Some cylinders use dip tubes which allow liquid to be extracted from the cylinder. These can be identified as recovery tanks with yellow tops and gray bottom and have a dual liquid and vapor valve assembly. Storage tanks without dip tubes will need to be tipped upside down in order for liquid to be removed. Once the liquid is removed from the storage cylinder, it can be charged into the system in the vapor state as long as all of the refrigerant is used from the charging cylinder. Liquid charging can be accomplished by using:

Figure 3. Th

•A throttling valve (Figure 3) to ensure the liquid vaporizes as it enters the suction line of the unit.

•Τhe gauge set valve as a throttling device to restrict liquid from flooding the compressor during charging.

Recharging should always be accomplished by using the nameplate charge. When this is not possible, charging us- ing the subcooling method can be done using the follow- ing procedure. This method requires accurate gauges and a digital strap-on temperature meter.

1.Operate system for 10 minutes to stabilize.

2.Ensure that the unit has proper water and air flow and the air filter is clean.

3.Attach gauges to discharge port and record the saturation temperature at this pressure using a pressure/temperature chart for R410a.

4.Measure the liquid line (LL) temperature (between aircoil and TXV in heating and between coax and TXV in cooling).

5.Subtract the LL temperature from the saturation pressure to find the subcooling. Consult Table 4 for appropriate values.

6.If the subcooling is too low add 2-4 oz.; if too

high, remove 2-4 oz. Typical values are shown in Table 4.

Superheat can be calculated similarly. This method also requires accurate gauges and digital strap-on thermometer.

1.Operate system for 10 minutes to stabilize.

2.Ensure that the unit has proper water and air flow and the air filter is clean.

3.Attach gauges to suction port and record the satura- tion temperature at this pressure using a pressure/ temperature chart for R410a.

Table 4. Typical Pressure and Temperatures (HTV060 Shown)

HTV060

 

Full Load Cooling - without HWG active

 

 

Full Load Heating - without HWG active

 

Entering

Water

Suction

Discharge

Super-

Sub-

Water

Air Temp

Suction

Discharge

Super-

Sub-

Water

Air Temp

Water

Pressure

Pressure

Temp Rise

Pressure

Pressure

Temp Drop

TempºF

Flow GPM

PSIG

PSIG

 

cooling

ºF

DropºF DB

PSIG

PSIG

 

cooling

ºF

RiseºF DB

 

 

 

 

 

 

 

 

7.5

1 17-127

170-190

27-32

15-20

18.2-20.2

17-23

66-76

282-302

10-16

9-14

8-10

19-25

30

1 1.3

1 16-126

143-163

28-33

13-18

12.6-14.6

17-23

69-79

285-305

10-16

9-14

6-8

19-25

 

15.0

1 15-125

135-155

29-34

12-17

7-9

17-23

72-82

289-309

10-16

10-15

4-6

20-26

 

7.5

128-138

238-258

16-21

14-19

20.5-22.5

21-27

90-100

310-330

1 1-17

12-17

1 1.3-13.3

24-30

50

1 1.3

126-136

222-242

21-26

13-18

14.9-16.9

21-27

95-105

313-333

1 1-17

12-17

8.5-10.5

25-31

 

15.0

125-135

205-225

26-31

12-17

9.2-1 1.2

21-27

99-109

316-336

1 1-17

12-17

5.7-7.7

26-32

 

7.5

135-145

315-335

10-15

14-19

21-23

22-28

1 15-125

337-357

12-18

14-19

14-16

28-35

70

1 1.3

134-144

296-316

12-17

13-18

15.5-17.5

22-28

120-130

341-361

12-18

14-19

10.6-12.6

29-36

 

15.0

133-143

276-296

15-20

1 1-16

10-12

22-28

126-136

345-365

12-18

15-20

7.3-9.3

30-37

 

7.5

139-149

408-428

10-15

15-20

20.1-22.1

21-27

157-167

390-410

15-20

14-19

18.2-20.2

37-45

90

1 1.3

138-148

386-406

10-15

13-18

14.8-16.8

21-27

161-171

394-414

15-20

14-19

13.9-15.9

38-46

 

15.0

138-148

364-384

10-15

1 1-16

9.5-1 1.5

21-27

166-176

398-418

15-20

15-20

9.6-1 1.6

39-47

11 0

7.5

144-154

515-535

8-13

14-19

19-21

20-26

 

 

 

 

 

 

1 1.3

143-153

493-513

8-13

13-18

14-16

20-26

 

 

 

 

 

 

 

15.0

142-152

469-489

8-13

12-17

9-1 1

20-26

 

 

 

 

 

 

HWG should be disabled for accurate chart comparison

*Based on Nominal 400 cfm per ton airflow and 70° F EAT htg and 80/67° F EAT cooling **Cooling air and water numbers can vary greatly with changes in humidity Subcooling is based upon the head pressure at compressor service port

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Heat Controller R410A manual Typical Pressure and Temperatures HTV060 Shown
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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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