Nilfisk FOOD MH42 Mode D'emploi page 46

8.4. Preventive/regular maintenance
Depending on usage, the following maintenance
should take place atleast once a year in order to pre-
vent defects and operational failures.
8.4.1. Rinsing the injector (MH42 / MP42)
Clean product supply after use to prevent clogging
from product/disinfectant remains.
1. Remove User Pack, if necessary.
2. Hold rinsing bottle with clean water against suc-
tion opening (with User Pack) or hose
(with can holders).
- Or, place User Pack with clean water in holder
or hose in bucket of clean water.
3. Activate hose handle until clean water flows from
nozzle (approx. 20 seconds).
Note:
Repeat procedure on all product supply systems.
8.4.2. Change of injector (MH42 / MP42)
Refer to image below for injector location.
1. Turn off power supply.
2. Turn off water and air supply.
3. Depressurise the system.
4. Unscrew and change injector. Beware of chemi-
cal residue.
5. Reconnect water, air supply and power supply.
8.4.3. Descaling (MH42 / MP42)
The interval of the descaling procedure depends on
the water hardness. Refer to table below.
°dH ppm Time between deliming
0-5 18-90 12 months
5-10 90-180 6 to 12 months
10-15 180-270 3 to 6 months
15-20 270-360 3 to 6 months
>20 >360 1 to 3 months
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Manual block system (MH42 / MP42)
1. Disconnect water and power supply to the unit.
2. Remove the unit's cover.
3. Depressurize the system.
4. Remove the injector block, product non-return
valve, air valve, and air non-return valve, including
the air fittings.
5. Rinse the injector block in clean water.
6. Place the injector block and product non-return
valves in a deliming bath with the selector knob
over the surface.
7. Wait for 60 minutes.
8. Rinse the injector block in clean water.
9. Reassemble the air valve, air non-return valve, and
product non-return valve on the injector block, and
mount the injector block in the unit.
10. Reconnect water to the unit.
11. Test the unit in foam position, making sure the
vacuum is sufficient (recommended: 14.8-20.7
inHg/-0.05-0.07MPa).
12. Test the unit's start and stop function in both foam
and rinse positions.
13. Reattach the unit's cover.
8.4.4. Coupling
• Lubricate all coupling parts regularly (once a
month) with waterproof grease to prevent leaks
and o-ring damage.
• If the unit has a spray gun, lubricate the gun's
o-ring.
• Replace o-rings in leaking quick couplings.
• • • • • •
8.4.5. Internal cleaning of the unit
• Internal cleaning of the unit is recommended
once a year, depending on the environment
where it is installed.
• Avoid spraying inside the unit.
• It is recommended to regularly check all product
110009350-1
hoses approximately once every three months.
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