21
> 1 %
> 1 %
max. 10 m
© STULZ GmbH – all rights reserved EN/02.2018/G17F
cyberlab original instructions
Measures to take with hot gas pipes if the condenser is positioned higher than the A/C unit:
• Ascending pipes must have oil traps every 3 m (see drawing).
• Install an oil trap at the end of horizontal gas pipes whenever the following pipe is an ascending pipe (see
drawing).
non return valve
(supplied loose)
non return valve
(supplied loose)
oil trap
appr
ox. 3 m
The units contain an oil separator which is installed at the hot gas side of the compressor and serves to recu-
perate oil in all operating states. The separated oil is injected on the suction side of the compressor.
For the hot gas line and the liquid line each a non return valve is supplied loose with the A/C unit. For the liquid
line we recommend to install the non return valve near the condenser, this avoids the return flow of refrigerant
in to the condenser and a possible low pressure error at the unit start.
For the hot gas line we recommend to install the non return valve as close as possible to the A/C unit. The
non return valve avoids the return flow of liquid refrigerant from the condenser when the A/C unit is not in
operation.
5.3.1.3 Strength pressure test
The compressor has been strength-tested in the factory. It is not necessary for the customer to strength-
or leak-test the compressor again.
nOtICe
Screwed pipe joints can loosen by long transportation distances.
Before final commissioning, check all screwed pipe joints in the refrigerant circuit on tightness
and retighten if necessary.