38/40MVC, MVQ

REFRIGERANT LINES

General refrigerant line sizing:

1. The 38MVC/MVQ units are shipped with a full charge of R410A refrigerant. All charges, line sizing, and capacities are based on runs of 25 ft (7.6 m). For runs over 25 ft (7.6 m), consult long-line section on this page for proper charge adjustments.

2.Minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m).

3.Refrigerant lines should not be buried in the ground. If it is necessary to bury the lines, not more than 36-in (914 mm) should be buried. Provide a minimum 6-in (152 mm) vertical rise to the service valves to prevent refrigerant migration.

4.Both lines must be insulated. Use a minimum of 1/2-in. (12.7 mm) thick insulation. Closed-cell insulation is recommended in all long-line applications.

5.Special consideration should be given to isolating interconnecting tubing from the building structure. Isolate the tubing so that vibration or noise is not transmitted into the structure.

SThe following maximum lengths are allowed:

REFRIGERANT LINE LENGTHS ft. (m)

Unit Size

Max Line

Max Elevation

Max Elevation

Length

(ID over OD)

(OD over ID)

 

9K

65 (20)

35 (11)

35 (11)

12K

65 (20)

35 (11)

35 (11)

18K

100 (30)

50 (15)

50 (15)

24K

100 (30)

60 (18)

60 (18)

SThe following are the piping sizes.

 

PIPE SIZES

 

Unit Size

Mix Phase

Vapor

9K

1/4”

3/8”

12K

1/4”

1/2”

18K

1/4”

1/2”

24K

3/8”

5/8”

Refrigerant Charge

 

REFRIGERANT CHARGE lb. (kg)

Unit Size

 

Air Conditioner

Heat Pump

9K

 

2.3 (1.0)

2.4 (1.1)

12K

 

2.9 (1.3)

3.0 (1.4)

18K

 

4.4 (2.0)

TBD

24K

 

TBD

TBD

SAbove charge is for piping runs up to 25 ft. (7.6 m).

SFor piping runs greater than 25 ft. (7.6 m), add 0.1 oz. of refrigerant per foot of extra piping up to the allowable length.

Long Line Applications, 38MVC Units:

1.A crankcase heater should be added for line lengths longer than 25 ft (7.62 m) to prevent the migration of refrigerant to the compressor during the “OFF” cycle.

2.A field fabricated wind baffle is recommended.

3.No change in line sizing is required.

4.Add refrigerant per table below.

ADDITIONAL CHARGE TABLE

 

 

Total

 

Additional Charge, oz.

Unit

Line Length,

 

 

ft

 

 

 

 

Size

 

 

 

 

 

 

Min.

 

Max.

10 --- 25 ft

 

>25 --- 65 ft

>65 --- 100 ft

 

 

(3.05 --- 7.62m)

(7.62---19.81m)

(19.81---30.48m)

 

 

 

 

9K

 

 

 

 

 

 

 

cool

 

 

 

 

 

 

 

only

 

 

 

 

 

 

 

9K

 

 

 

 

 

 

 

hp

 

 

65

 

 

 

 

 

 

 

 

 

 

 

12K

10

none

 

0.1 oz per

 

 

 

 

 

cool

 

 

 

 

 

 

 

foot

 

only

 

 

 

 

 

 

 

 

 

 

 

 

 

12K

 

 

 

 

 

 

 

hp

 

 

 

 

 

 

 

18K

 

 

100

 

 

 

0.1 oz. per

cool

 

 

 

 

 

 

 

 

 

 

foot

only

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5.Reduction in capacity due to long lines can be calculated from the chart below.

CAPACITY LOSS

Capacity, % Loss

 

 

Line Length, ft

 

Cooling:

25

45

65

100

9 & 12 KBTU/H models

0%

2%

5%

 

18 & 24 KBTU/H models

0%

2%

4%

7%

Heating:

 

 

 

 

9 & 12 KBTU/H models

0%

7%

11%

 

18 & 24 KBTU/H models

0%

7%

11%

15%

18

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Carrier 38MVC, 40MVC, 38MVQ, 40MVQ service manual Refrigerant Lines, General refrigerant line sizing, Refrigerant Charge
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40MVQ, 40MVC, 38MVQ, 38MVC specifications

The Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ are advanced air-conditioning systems designed for both residential and commercial applications. These units are recognizable for their commitment to efficiency, reliability, and comfort, making them ideal choices for various environments.

One of the standout features of these models is their high energy efficiency ratings. Both the 38MVC and 38MVQ boast Seasonal Energy Efficiency Ratios (SEER) that exceed industry standards, delivering substantial energy savings over time. The 40MVC and 40MVQ models also continue this trend, featuring enhanced efficiency that translates into lower utility bills and a reduced carbon footprint.

These air-conditioning units utilize Carrier's innovative inverter technology, which allows for variable speed operation. This means that the compressor can adjust its speed according to the cooling demand, resulting in smoother temperature control and less energy consumption. The inverter technology not only maximizes comfort but also contributes to quieter operation, as the systems can run at lower speeds when full capacity is not required.

In addition to efficiency, the Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ are equipped with advanced filtration systems. These systems work to purify the air by reducing allergens and pollutants, ensuring a healthier indoor environment. Some models also come equipped with smart connectivity options, allowing users to control their air conditioning remotely via a smartphone app. This feature adds convenience and helps monitor energy usage effectively.

With durable construction and high-quality components, these units are designed to withstand the test of time, reducing the need for frequent repairs or replacements. They are also built to operate quietly, so they can provide comfort without disturbing the peace of the indoor environment.

In terms of installation flexibility, the Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ can be easily integrated into various existing HVAC systems, thanks to their compatible size and design. This adaptability makes them suitable for a wide range of applications, from small residential homes to larger commercial spaces.

Overall, the Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ models are engineered with cutting-edge technologies that prioritize efficiency, comfort, and ease of use, making them an excellent choice for those looking to enhance their indoor climate control solutions.
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