Fujitsu FO2416RTJNAA - Page 12

12
4.4 Refrigerant Line Set Selection
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replacement units, a liquid line filter drier must be
installed and the line set must be properly sized.
Test the oil for acid. If it tests positive for acid, a
suction line filter drier is mandatory.
IMPORTANT: When replacing an
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the line set or ensure that residual mineral oil is
drained from existing lines including oil trapped in
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4.4.1 Replacing Existing Systems
4.0 INSTALLATION
4.4.2 Line Set Length and Fitting Losses
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ϭϮ΀ϭϮϳϭ΁ ϭϰ΀Ϭϰϯ΁ Ϭϵ΀ϬϮϳ΁ Ϭϰ΀ϬϭϮ΁ ϵ΀Ϯϳϰ΁ ϱ΀ϭϱϮ΁ Ϭϲ΀Ϭϭϴ΁ ϲ΀ϭϴϯ΁
ϱϴ΀ϭϱϴϴ΁ ϭϱ΀Ϭϰϲ΁ ϭ΀ϬϯϬ΁ Ϭϱ΀Ϭϭϱ΁ ϭϮ΀ϯϲϲ΁ ϲ΀ϭϴϯ΁ Ϭϴ΀ϬϮϰ΁ ϲ΀ϭϴϯ΁
ϯϰ΀ϭϵϬϱ΁ ϭϵ΀Ϭϱϴ΁ ϭϯ΀ϬϰϬ΁ Ϭϲ΀Ϭϭϴ΁ ϭϰ΀ϰϮϳ΁ ϳ΀Ϯϭϯ΁ Ϭϵ΀ϬϮϳ΁ ϲ΀ϭϴϯ΁
ϳϴ΀ϮϮϮϯ΁ Ϯϯ΀ϬϳϬ΁ ϭϱ΀Ϭϰϲ΁ Ϭϳ΀ϬϮϭ΁ ϭϱ΀ϰϱϳ΁ ϴ΀Ϯϰϰ΁ ϭ΀ϬϯϬ΁ ϲ΀ϭϴϯ΁
ϭͲϭϴ΀Ϯϴϱϴ΁ Ϯϳ΀ϬϴϮ΁ ϭϴ΀Ϭϱϱ΁ Ϭϵ΀ϬϮϳ΁ ϮϮ΀ϲϳϭ΁ ϭϮ΀ϯϲϲ΁ ϭϱ΀Ϭϰϲ΁ ϲ΀ϭϴϯ΁
4.4.3 Liquid Line Selection
Table 1
Tubing
Refrigerant tubing is measured in terms of actual
length and equivalent length. Actual length is used
for refrigerant charge applications. Equivalent
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LQJOHQJWKÀWWLQJVYHUWLFDOVHSDUDWLRQDFFHVVRULHV
DQGÀOWHUGULHUV7KHWDEOHEHORZUHIHUHQFHVGLIIHU-
ent commonly used equivalent lengths.
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VXEFRROHGOLTXLGUHIULJHUDQWEHWZHHQWKHRXWGRRU
XQLWWRWKHLQGRRUXQLW,WLVLPSRUWDQWQRWWRDOORZWKH
UHIULJHUDQWWRÁDVKLQWRVXSHUKHDWHGYDSRUSULRUWR
the expansion device of the indoor or outdoor coil.
7KHÁDVKLQJRIUHIULJHUDQWFDQRFFXUIRUWKHIROORZ-
ing reasons:
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• Improperly selected liquid line size
• Absorption of heat prior to expansion device
 ([FHVVLYHYHUWLFDOVHSDUDWLRQEHWZHHQWKHRXW-
door unit and indoor coil
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 .LQNHGOLTXLGOLQH
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• Measure the total amount of vertical separation
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• Measure the linear length of liquid line needed.
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length.
• Reference Table 2 to verify the calculated
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vertical separation and diameter of liquid line.