37 - Service and maintenance -
SERVICE AND MAINTENANCE
9.1 REMOVING A PUMP
Follow all national and local safety requirements when re-moving the pump. Particular care
must be taken of the following:
Check the plant room layout and exit doors so you can evacuate the area quickly in case of
an emergency.
Seek assistance to handle and remove the pumps.
Always wear the correct protective safety clothing. As a minimum use safety goggles and
gloves. In case of NH3 have a safety gas mask ready to hand.
Isolate the pump by switching off and locking off the electrical supply and the
electrical controls. A label should be fixed to control panel to indicate pumps are
switched off and are being worked on. Note the sequence of electrical connections
and disconnect the wiring.
A trained engineer or suitable qualified electrician in accordance with electrical
engineering regulations should carry out any work on electrical equipment or
controls.
Before moving or tilting the pump e.g. to access or to clean the conical suction filter, replace
the shaft seal or other parts, the refrigerant must be discharged. It is recommend-ed that the
refrigerant is purged to the dry gas side of the surge drum via the pressure gauge valve at the
base of the discharge valve. Hot water may be used on the outside of the pump to accelerate
the boiling off of the liquid refrigerant.
The use of an open flame is prohibited.
When there is no liquid refrigerant left in the pump, any remaining refrigerant gas can be
purged through the pressure gauge valve or, if installed, the drain valve EA10 GÜ/GB with
quick acting valve.
When there is no residual pressure inside the pump the flange bolts can be carefully un-
screwed. Be aware of any trapped liquid or leaking valves seats.
Be aware of any trapped liquid or leaking valves seats.
9.2 OIL LEVEL CONTROL
The GP refrigerant pump is filled by the manufacturer with a special oil “MR 520” from FUCHS-
DEA, which guarantees optimum performance and avoids carbonisation of the oil. This oil can
be used at temperatures down to –50°C.
The oil level should be checked weekly. If you notice at standstill of the pump that the oil side
glass shows a distincly checkered marking under light, oil has to be replenished.
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