Maintenance; Regular Inspections; Integrated Pressure Vessel; Taking The Rcme System Out Of Operation - Grundfos RCME Notice D'installation Et De Fonctionnement

17. Maintenance

Warning
Before starting any work on pumps, terminal
boxes or control cabinet, the power supply must
have been switched off for at least five minutes,
and it must be ensured ensure that it cannot be
accidentally switched on.
17.1 CU 372
The CU 372 is maintenance-free. It must be kept clean and dry.
Protect it from direct sunlight. The temperature of the CU 372
must not exceed the maximum ambient temperature.
See section
19.2

Temperatures.

17.2 Regular inspections

The RCME system should be inspected at regular intervals.
This must be carried out when the system has been shut down.
Perform the following:
• Check that there are no leaks in the internal pipework, the
pump and the buffer tank.
• Check the precharge pressure of the pressure vessel and
adjust, if necessary. See section
vessel.
• Check that the booster pump operates quietly and smoothly
without vibration or excessive noise.
Should any faults be found, see section
After inspection, ensure that the isolating valves are fully open,
and that the power supply to the RCME system is switched on
again.

17.3 Integrated pressure vessel

Set the precharge pressure of the vessel to 70 %
of the setpoint selected on the booster pump
control panel (booster pump discharge

pressure).

Note
Measure the precharge pressure while the
system is pressureless.
If the precharge pressure is not set correctly,
this may result in incorrect operation of the
RCME unit.
Check and adjust the precharge pressure of the vessel before the
booster pump is filled with water. If the system has already been
filled and the pump has been running, proceed as follows:
1. Switch off the power supply to the RCME system.
2. Release the water pressure by opening a tap in the discharge
pipe of the system. Leave the tap open while checking and
adjusting the precharge pressure.
3. The precharge pressure can now be checked using a car tyre
pressure gauge. The air valve is located under the small lid on
top of the pressure vessel.
For small pressure adjustments a foot pump can be used.
If large amounts of gas are required, use dry nitrogen to
prevent corrosion within the vessel.
Setting example:
If the setpoint has been set to 4.5 bar, the precharge pressure
must be 4.5 x 0.7 = 3.15 bar.
24
17.3 Integrated pressure
21. Fault finding.

18. Taking the RCME system out of operation

Take the RCME system out of operation by switching the main
switch off.
Warning
The conductors to the main switch are still live.
Lock the main switch to ensure that the power
supply cannot be accidentally switched on.

19. Technical data

19.1 Pressure
Maximum operating pressure: 5 bar.
19.2 Temperatures
Liquid temperature: 3-40 °C.
Maximum ambient temperature: 40 °C.

19.3 Relative air humidity

Maximum 95 %.

19.4 Sound pressure level

65 dB(A).

19.5 Enclosure class

IP54.

19.6 Volume of buffer tank

Rated volume: 160 litres.
Effective water volume: 108 litres.
Minimum booster pump operating volume: 41 litres.

19.7 Weight of RCME unit

Weight with filled buffer tank: 200 kg.
The stated weight includes base plate, booster pump and buffer
tank.

19.8 Dimensions

See fig. 3 on page 116.

20. Electrical data

20.1 Supply voltage

3 x 400 VAC - 10 %/+ 10 %, 50 Hz, PE.