Refrigerant Piping Design; System Piping - Sanyo SGP-EGW190M Technical Data Manual

System Design

(1) System piping

1) Limitations on refrigerant tubing length
2) Ranges for Refrigerant Tubing Length and Installation Height Difference
Category
Allowable tubing
Length
Allowable Height
Difference
Allowable length
for branched
tubing
(header branch)
*1. The minimum length for the main tubing is 7 m.
*2. The maximum length for balance tubes is 10 m.
*3. If cooling mode is expected to be used when the external temperature is 10°C or below, the
maximum length is 30 m.
Symbol
L1 Max. allowable tubing length
Difference between longest and shortest
L = (L2 – L4)
tubing lengths after the No. 1 branch (first
branching point)
Max. length for main tube (tube with widest
1
LM*
diameter)
1, 2 to 48 Max. length for each tube branch
2
L5* Distance between outdoor units
Max. height difference
H1
between indoor and
outdoor units
H2 Max. height difference between indoor units
Max. height difference between outdoor
2
H3*
units
Max. length between first T-tee branch
L3 (provided by installer) and the closed tube
end

2. Refrigerant piping design

Description
If outdoor unit is
above
If outdoor unit is
below
D-3
Tubing Length [m]
170
(Equivalent length 200)
40
120
30
10
50
*3
35
15
4
2