GEA Bock HGZ7 - Manual (Page 29)

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7| Commissioning
Make sure that the suction and pressure line shut-off valves are open.
With the compressor switched off, add the liquid refrigerant directly to the condenser or receiver,
breaking the vacuum.
Pay attention to adequate refrigerant fill before starting up the compressor.
During operation, refrigerant must be free of bubbles in sight glasses 1 and 2 of the liquid
subcooler.
If the refrigerant needs topping up after starting the compressor, it can be topped up in vapour
form on the suction side, or, taking suitable precautions, also in liquid form at the inlet to the
evaporator.
7.5 Refrigerant charge
CAUTION Wear personal protective clothing such as goggles and protective
gloves!
ATTENTION Avoid overfilling the system with refrigerant!
To avoid shifts in concentration, zeotropic refrigerant blends must
always only be filled into the refrigerating plant in liquid form.
Do not pour liquid coolant through the suction line valve on
the compressor.
It is not permissible to mix additives with the oil and
refrigerant.
7.6 Start-up
WARNING Ensure that both shut-off valves are open before starting the
compressor!
ATTENTION If larger quantities of oil have to be topped up, there is a risk of
oil hammer effects.
If this is the case check the oil return!
Check that the safety and protection devices (pressure switch, motor protection, electrical contact
protection measures, etc.) are all functioning properly.
Switch on the compressor and allow to run for a minimum of 10 min.
Check the oil level by: The oil must be visible in the sightglass.