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Wide tube
Narrow tube
Indoor unit
O.D.
1/2"
(12.7mm)
O.D.
1/4"
(6.35 mm)
Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU
CU-KS18NKUA
Heat exchanger
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service
valve
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service
valve
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Outdoor unit
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expansion
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H.P.
High pressure
switch
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