SYSTEMP – Installation Operation Manual (IOM SYSTEMP rev.N)

Table Of Contents
48
9 COOLING CONNECTIONS
9.1 ROUTING OF THE COOLING CIRCUIT PIPES
WARNING!
Correct pipe routing is crucial for good conditioner operation. It is necessary to be particu-
larly careful in the choice and set-up of the supply and liquid pipes, especially with very long
lines.
It is important to remember that the pipes should be SHORT AND WITH THE LEAST BENDS
POSSIBLE since the cooling capacity of the circuit can be reduced based on its length.
9.1.1 DEVELOPMENT OF OIL TRAPS (SIPHONS) IN VERTICAL UPRIGHTS OF SUPPLY PIPE
WARNING!
When developing the oil traps (Siphons), ensure the oil traps (Siphons) are developed with a
180° curve section.
In the presence of vertical climbing sections (Uprights), in order to allow the oil return to the compressor, oil traps (Siphons)
must be inserted.
The operating principle of the oil traps is very simple and is similar to that of a siphon:
1) The oil that cannot be drawn from the refrigerant accumulates inside the trap (Siphon):
2) The trap continues to accumulate oil until it is completely blocked.
3) The obstruction causes the refrigerant pressure to rise in such a way as to push the accumulated oil upwards (Boost).
A Stage 1: Accumulation
B Stage 2: Obstruction
C Stage 3: Boost
Operating principle of oil traps (Siphons)
In order to work properly, the oil traps must be placed:
At the start of each vertical section, and
Every 5 metres of piping if the vertical line is particularly high.
9.1.2 BACK-SIPHON AT END OF SUPPLY LINE UPRIGHTS
In the presence of vertical climbing sections (Uprights), a back-siphon needs to be created at the end of the upright.
The back-siphon prevents any liquid refrigerant present in the piping from returning to the compressor when the latter is
inactive.
A B C