Refrigerant Lines, General refrigerant line sizing

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
Unit Size	Length	(ID over OD)	(OD over ID)
	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,				Additional Charge, oz.
Unit		ft
Size		ft
	Min.		Max.	10 --- 25 ft		>25 --- 65 ft	>65 --- 100 ft
	Min.		Max.	(3.05 --- 7.62m)		(7.62---19.81m)	(19.81---30.48m)
				(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
12K
cool
cool						foot
only						foot
only
12K
hp
18K			100				0.1 oz. per
cool							0.1 oz. per
cool							foot
only							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%

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.