SB-110-4 37
NOTICE
Potential chemical reactions due to air penetra-
tion!
Proceed swiftly and keep shut-off valves closed
until evacuation.
4.3.1 Pipe connections
The pipe connections are suitable for pipes in all com-
mon dimensions in millimetres and inches. Brazed con-
nections have stepped diameters. The pipe will im-
merge more or less depending on its dimensions. If ne-
cessary, the bushing may even be cut at the end with
the largest diameter.
4.3.2 Shut-off valves
CAUTION
Depending on the operation mode, the shut-off
valves may become very cold or very hot.
Risk of burning or frostbite!
Wear suitable protective equipment!
NOTICE
Do not overheat the shut-off valves!
Cool the valve body and the brazing adapter
during and after the brazing operation.
Maximum brazing temperature 700°C!
For welding, dismount the pipe connections and
the bushes.
When turning or mounting shut-off valves:
NOTICE
Risk of damage to the compressor.
Tighten screws crosswise in at least 2 steps to
the prescribed tightening torque.
Test tightness before commissioning!
When retrofitting the ECO shut-off valve:
Information
To increase the corrosion protection, it is recom-
mended to coat the surface of the ECO shut-off
valve.
4.3.3 Pipelines
Use only pipes and system components that are
• clean and dry inside (free from slag, swarf, rust and
phosphate coatings) and
• delivered with an air-tight seal.
The compressors are supplied with blanking plates on
the pipe connections or shut-off valves.
▶ Remove the blanking plates when mounting.
Information
The blanking plates are only designed to serve
as a transport protection. They are not suitable
as a separation between different system sec-
tions during the strength pressure test.
NOTICE
For systems with rather long pipelines or for
brazing operations without protective gas:
Install the suction-side cleaning filter (mesh size
<25μm).
NOTICE
Risk of compressor damage!
Generously sized filter dryers should be used to
ensure a high degree of dehydration and to
maintain the chemical stability of the circuit.
Make sure to choose a suitable quality (molecu-
lar sieves with specially adapted pore sizes).
Information
Notice for mounting the suction-side cleaning fil-
ter, see Manual SH-110.
Mount pipes in a way to protect the compressor from
flooding with oil or liquid refrigerant during standstill.
Follow the notes given in SH-110.
HS.85: Liquid injection and / or economiser
The optional pipes for liquid injection (LI) and / or eco-
nomiser (ECO) must first be routed upward from the
connection (see following figure). This avoids oil migra-
tion and damage to the components through hydraulic
pressure peaks (see Manual SH-110). The kit for eco-
nomiser operation already includes the required pipe
joint with swan neck. See also Technical Information
ST-610 and the information given in Manual SH-170.
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