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© Danfoss | Climate Solutions | 2023.07
6.7 Pressure switch
Check that the safety and protection devices (pressure switch, motor protection, electrical contact
protection measures, etc.) are functioning properly.
Switch on the compressor and let it run for at least 10 minutes.
The machine should reach a state of equilibrium.
Check the
oil level
: The oil level must be visible in the sight glass.
After a compressor is replaced, the oil level must be checked again. If the level is too high, oil
must be drained off (danger of oil liquid shocks; reduced capacity of the refrigerating system).
Ensure that both shut-off valves are open before starting the
compressor!
If larger quantities of oil have to be topped up, there is a risk of oil
impact effects. If this is the case, check the oil return!
6.6 Start-up
6
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Commissioning
Suitably adjusted pressure switches according to UL 207 / EN 378 or national standards that switch
off the compressor
before reaching
the maximum permissible operating pressure must be installed
in the system. The pressure reduction for the pressure switches can occur either at the suction and
pressure lines between the shut-off valve and compressor or at the non-lockable connections for the
shut-off valves (connections A and B, see Chapter 9).
