Starting; Priming; Frequency Of Starts And Stops; Operation And Maintenance - Grundfos CH Series Installation And Operating Instructions Manual

5. Starting

5.1 Priming

Do not start the pump until it has been filled with
liquid and vented.
Warning
In systems with hot liquids, extreme
caution should be exercised when
venting the pump to eliminate the risk
of personal injury caused by escaping
water.
Booster systems and systems where the liquid
level on the suction side is above the pump inlet:
1. Close the isolating valves either side of the
pump.
2. Remove the priming plug P. See fig. 4.
3. Slowly open the suction valve and keep it open
until a steady stream of liquid runs out the
priming port.
4. Close the valve, replace the priming plug and
tighten securely.
5. Open the suction valve.
6. Start the pump and slowly open the discharge
valve until it is fully open.
Priming plug
Fig. 4
Pumping from tanks and wells where the liquid
level on the suction side is below the pump inlet:
1. Close the discharge isolating valve.
2. Remove the priming plug P. See fig. 4.
3. Pour water through the priming port. Make sure
that the suction pipe and pump are completely
filled with liquid and vented.
4. Replace the priming plug and tighten securely.
5. Start the pump and slowly open the discharge
valve until it is fully open.

5.2 Frequency of starts and stops

Maximum 100 starts per hour.

6. Operation and maintenance

Under normal operating conditions, the pump does
not require any maintenance.
If the pump has been used for pumping liquids that
may leave impurities in the pump, it should be
flushed through with clean water immediately after
use.

6.1 Frost protection

Pumps which are not being used during periods of
frost should be drained to avoid damage.
Remove the priming and drain plugs P and V.
See fig. 5.
Do not replace the plugs until the pump is to be used
again.
Priming and drain plugs
Fig. 5
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