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2004 Product Data 69
14. Installation
14.1 Piping Length & Refrigerant Charge
The maximun allowable level and piping length
7.5m
It does not matter which unit is higher.
7.5m
Indoor Unit
A
B
C
D
[Outdoor Unit]
Indoor Unit Capacity Pipe Size Rated Max Additional
(Btu/h) Gas Liquid Length Length Refrigerant
7k, 9k, 12k 3/8"(9.52mm) 1/4"(6.35mm) 7.5m 15m 30g/m
18k, 24k 1/2"(12.7mm) 1/4"(6.35mm) 7.5m 15m 30g/m
Refrigerant Charge
❋ Extra refrigerant = (Extended length - Rated length) x Additional refrigerant
Model Standard Length Max piping length each indoor unit Max total
[Outdoor Unit]
A, B, C, D A B C D
piping length
A2UC/H146FA0 7.5m 15m 15m - - 30m(A+B)
A2UC/H186FA0 7.5m 15m 15m - - 30m(A+B)
A3UC/H216FA0 7.5m 15m 15m 15m - 45m(A+B+C)
A4UC/H306FA0 7.5m 15m 15m 15m 15m 60m(A+B+C+D)