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Interconnecting Tubing (cont.)
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-
90° Short
Line Size
Radius
(in)
Elbow
3/8
1.3
1/2
1.4
5/8
1.5
3/4
1.9
7/8
2.3
1-1/8
2.7
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-
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
sure drop allowed for the liquid line is 50 PSI. The
ent commonly used equivalent lengths.
Table 1
Equivalent Length for Fi ngs ( )
90° Long
Radius
45°
Elbow
Elbow
0.8
0.3
0.9
0.4
1
0.5
1.3
0.6
1.5
0.7
1.8
0.9
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
• Round-down the total equivalent length to the
• Reference Table 2 to verify the rounded-down
-
INSTALLATION
Solenoid
Check
Valve
Valve
6
4
9
5
12
6
14
7
15
8
22
12
This will equal your total equivalent length.
closest value in Table 2.
value of the calculated equivalent length is com-
patible with the required vertical rise and diam-
eter of liquid line.
Note: Eleva on is defined as the
highest point of the line set to the
lowest
-
Site
Filter
Glass
Dryer
0.4
6
0.6
6
0.8
6
0.9
6
1
6
1.5
6
13
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