Installation
Installation in terms of mechanical work (refrigeration system and piping), electrical work, and
installation of safety equipment must be performed in accordance with local codes and rules and/
or according to
EN 378-3
and
EN 378-4
as a minimum requirement.
The pressure loss in the downstream line from the safety valve must meet the values stated in
EN
13136
to which
EN 378
is referring. The data necessary to dimension the line in accordance with this
standard is stated in the data sheet for your particular unit in the beginning of this manual.
Ensure that all necessary documents are available including declarations, certificates, identification
plates, manuals, machine card, log books, and/or other documentation required according to local
rules and/or
EN 378
.
The main issue and check points for installation of the compressor unit are as follows:
1. Lifting the unit. Only use the lifting lugs marked with red.
WARNING
This screw compressor unit may be top-heavy. Use caution to prevent it from turning over.
2. Place the unit with sufficient free space for operation and maintenance.
3. Place the unit on a foundation suitable for the actual load and vibrations with or without
vibration dampers according to the vibration design strategy.
4. Welding on suction piping, discharge piping, and other oil cooling system pipings. The piping
design must include proper design considerations regarding function, vibrations, thermal
expansion, and pre-stress after welding in order to avoid high load on the compressor unit
connections.
5. Leak and pressure test according to the applied/local codes and rules. Isolate the compressor
unit from the test pressure or disconnect pressure transducers and safety valves. Never exceed
the test pressure of the unit stated on the unit name plate.
6. Connect power supply wiring (compressor motor, oil pump motor (optional), and control
system) according to electrical diagrams.
7. Complete a final check of all relevant components, connections, electrical connections, safety
functions, meaning safety valve, safety high pressure cut-out (below compressor safety
overflow valve and not above 0.9 x maximum allowable pressure), and the machine room safety
equipment.
8. Evacuate the unit.
9. Charge oil (type according to SABROE oil recommendation).
10. Charge refrigerant.
11. Connect power supply.
12. Setup the control system settings including calibration according to the control system manual.
13. Check the direction of rotation of the compressor motor and oil pump (optional).
14. Mount the coupling.
35
SAB 283-355 A-Frame OHU 6042 and OHU 7650 (including ATEX) Screw Compressor Unit
