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Tubing

Interconnecting Tubing and

Fitting Losses

Refrigerant tubing is measured in terms of actual

length and equivalent length. Actual length is used

for refrigerant charge applications. Equivalent

length takes into account pressure losses from tub-

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ent commonly used equivalent lengths.

Equivalent Length for Fings ()

Line Size

(in)

90° Short

Radius

Elbow

90° Long

Radius

Elbow

45°

Elbow

Solenoid

Valve

Check

Valve

Site

Glass

Filter

Dryer

3/8 1.3 0.8 0.3 6 4 0.4 6

1/2 1.4 0.9 0.4 9 5 0.6 6

5/8 1.5 1 0.5 12 6 0.8 6

3/4 1.9 1.3 0.6 14 7 0.9 6

7/8 2.3 1.5 0.7 15 8 1 6

1-1/8 2.7 1.8 0.9 22 12 1.5 6

Liquid Line Selection

The purpose of the liquid line is to transport warm

sub-cooled liquid refrigerant from the outdoor unit

to the indoor unit. It is important not to allow the re-

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refrigerant can occur for the following reasons:

• Low refrigerant charge

• Improperly selected liquid line size

• Absorption of heat prior to expansion device

• Excessive vertical rise between the condenser

and evaporator

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sure drop allowed for the liquid line is 50 PSI. The

procedure for selecting the proper liquid line is as

follows:

• Measure the total amount of vertical rise

• Measure the total amount of liquid line needed

• Add all of the equivalent lengths associated with

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This will equal your total equivalent length.

• Round-down the total equivalent length to the

closest value in Table 2.

• Reference Table 2 to verify the rounded-down

value of the calculated equivalent length is com-

patible with the required vertical rise and diam-

eter of liquid line.

Table 1

Note: Elevaon is deﬁned as the

highest point of the line set to the

lowest

INSTALLATION

Interconnecting Tubing (cont.)

Brand	Fujitsu
Model	FO14R Series
Category	Heat Pump
Language	English

Fujitsu FO14R Series User Manual

Table of Contents

Questions and Answers:

Fujitsu FO14R Series Specifications

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