10
1)
Options / model variants
Original instructions
MC 5M - MC 6P - MC 7P
Installation guide
c c
3.7 BA valve
(a) Female
coupling
BA valve
(b) Male
coupling
Maintenance
1. Mount a male coupling on the water tap.
2. Connect (a) on the BA valve to the water tap.
3. Mount a female coupling on the water inlet hose.
4. Connect (b) on the BA valve to the water inlet hose.
5. Connect the water inlet hose to the high pressure washer.
6. Turn on the water and start the machine.
At least once a year, check the function as follows:
1. After work, switch off the high pressure cleaner.
2. Close the water tap valve.
3. Release the pressure in water the supply hose by triggering the
spray pistol.
4. Dismount the backflow preventer. Water has to come out of the
drain opening (c) (max. 100ml) to ensure separation of the potable
water.
5. If this is not the case, try cleaning the BA valve or contact your
Nilfisk representative.
This high pressure washer/cleaner is only allowed to be con-
nected with the drinking water mains, when an appropriate
backflow preventer has been installed, Type BA according to
EN 60335-2-79.
The BA valve can be ordered under number:
• BA valve including GARDENA couplings: 106411177
• BA valve including NITO couplings: 106411178
• BA valve including GEKA couplings: 106411179
• BA valve without couplings: 106411184
The couplings can be ordered under number:
• 3/4” GARDENA (a): 1608629
• 3/4” GARDENA (b): 32541
• 3/4” NITO (a): 1602945
• 3/4” NITO (b): 1600659
• 1/2” NITO (b): 1604669
• 3/4” GEKA (a): 1718
• 3/4” GEKA (b): 1311
CAUTION
• The backflow preventer can be mounted either vertically or hori-
zontally, and the drain opening (c) must be mounted pointing
downwards.
• Water flowing from the drain opening (c) must be able to flow
freely.
• If there is a risk of running sands in the inlet water (i.e. from your
own well), an additional filter should be mounted between the
water tap and backflow preventer.
• The length of the hose between the backflow preventer and the
high pressure washer must be at least 12 metres (min diameter
3/4 inch) to absorb possible pressure peaks.
• As soon as water has flown through the BA valve, this water is
not considered to be drinking water any more.
• Protect the backflow preventer to any exposure to frost.
• Keep the backflow preventer clean, and free of dirt.
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