Maintenance; Operation; Frost Protection; Disposal - Grundfos CRN 10 Montage- Und Betriebsanleitung

9. Maintenance

See the installation and operating instructions for standard CR,
CRN pumps.
Dosing pump
See the installation and operating instructions for the dosing
pump.

10. Operation

To ensure optimum function and performance, check the pressure
regularly.
Dosing pump
The pressure of the barrier fluid must always be 1.5 to 2 bar
higher than the pressure of the pumped liquid. This is
automatically checked by the pressure switch/ transmitter fitted
together with the dosing pump.
A very small quantity of the barrier fluid, i.e. less than
Note 10 ml/24 operating hours, will always flow into the
pumped liquid.

10.1 Frost protection

For general guidelines on frost protection of the pump, see the

installation and operating instructions for standard CR, CRN

pumps.
Seal chamber
Drain the seal chamber by slackening the lower plug (pos. E, fig.
1).
Dosing pump
For frost protection, see the installation and operating instructions
for the dosing pump.

Warning

If the pumped liquid is hazardous to health, take
special care when draining the pump. Local safety
regulations must be observed.

11. Disposal

This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grundfos company
or service workshop.
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