Trane Variable Refrigerant Flow System Mini Outdoor Unit Series Instrukcja Instalacji Pobierz pdf (Strona 16)

16 VRF-SVN33A-EN

Refrigerant Piping

Figure 11. Distribution header connection

Table 9. Maximum refrigerant piping length and height differences for installations with Y-joints and EEV kits

Piping location

Piping length and

height difference

(ft [m])

Distribution header connection

(refer to Figure 11)

Y-joint and distribution

header connection

(refer to Figure 12)

Maximum allowable

piping length

Mini outdoor unit to

indoor units

Actual length

The distance between the mini outdoor unit and the farthest indoor unit ≤

492 ft (150 m)

Example: 8 indoor units

a+g ≤ 492 ft (150 m)

Example: 8 indoor units

a+b+c ≤ 492 ft (150 m)

Equivalent length

The distance between a mini outdoor unit and the farthest indoor unit ≤

574 ft (175 m)

(a)

Main pipe length

The main pipe (a) from the mini outdoor unit to the first Y-joint should be

less than 361 ft (110 m)

Total length The sum of the total length of pipes should be less than 984 ft (300 m)

Maximum allowable

height difference

Mini outdoor unit to

indoor units

Height

H1: Height difference between a mini outdoor unit and indoor unit < 164 ft

(50 m)

H2: Height difference between indoor units ≤ 49 ft (15 m)

Maximum allowable length after 

Y-joint

Actual length

The distance between the first Y-joint

and the farthest indoor unit ≤ 131 ft

(40 m)

Example: b+c–f+g ≤ 131 ft (40 m)

The distance between the first Y-

joint and the farthest indoor unit ≤

131 ft (40 m)

Example: 8 indoor units

b+c, d+g ≤ 131 ft (40 m)

(a) If the equivalent length between a mini outdoor unit and the farthest indoor unit exceeds 295 ft (90 m), increase the main gas pipe by one size.

Distribution header

Mini outdoor unit

Indoor units

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 51 52

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