Honeywell GmbH 9 MU1H-1101GE23 R0507
GB
9.1.3 Check valve
1. Close shut off valve on outlet
2. Open check valve
o Until the pressure is released, some water will flow out of
the check valve. After a short period of time the water
flow should stop. If the water continues to drip or run,
then the backflow preventer must be replaced - see
servicing of backflow preventer
3. Close check valve again
4. Open shut-off valve again
9.2 Servicing
9.2.1 Pressure reducing valve
1. Close shutoff valve on inlet
2. Release pressure on outlet side (e.g. through water tap)
3. Close shutoff valve on outlet
4. Loosen slotted screw
o Do not remove slotted screw
5. Slacken tension in compression spring
o Turn control handle to the left (-) until it does not move
any more
o Do not turn in too far!
6. Unscrew spring bonnet
o Use double ring wrench ZR10K
7. Remove slip ring
8. Remove valve insert with a pair of pliers
9. Unscrew filter cup and guide piece
o Use double ring wrench ZR10K
10.Remove slotted ring
11.Check that sealing ring, edge of nozzle and slotted ring are
in good condition, and if necessary replace the entire valve
insert
12.Reassemble in reverse order
13.Set outlet pressure
9.3 Adjusting the setting scale
If the adjustment knob is removed, this setting is lost. A new
setting can be achieved using a pressure gauge.
1. Close shutoff valve on inlet
2. Release pressure on outlet side (e.g. through water tap)
3. Close shutoff valve on outlet
4. Loosen slotted screw
o Do not remove slotted screw
5. Slowly open shutoff valve on inlet
6. Set desired outlet pressure (e.g. 4 bar)
7. Align scale (e.g. 4) in middle of viewing window
8. Retighten slotted screw
9. Slowly open shutoff valve on outlet
9.3.1 Filter
• The filter must be cleaned by reverse rinsing regularly, at
the latest every 2 months
• Non-compliance can lead to the filter becoming blocked
This results in a drop in pressure and decreasing water
flow
• The filter meshes are made of stainless steel. A red
coating as a consequence of rust from the pipelines has no
influence on function or the way the filter works
9.3.2 Check valve
1. Close shutoff valve on inlet
2. Release pressure on outlet side (e.g. through water tap)
3. Close shutoff valve on outlet
4. Replace check valve
9.4 Cleaning
5. Close shutoff valve on inlet and outlet.
6. Release pressure on outlet side (e.g. through water tap)
7. Close shutoff valve on outlet
8. Unscrew filter bowl
o Use double ring wrench ZR10K
9. Remove filter, clean and reinsert
10.Place O-ring onto filter bowl
11.Slowly open shutoff valve on inlet
12.Slowly open shutoff valve on outlet
Interval: once a year
Frequency: every 1-3 years (depending on local
operating conditions)
To be carried out by an installation company
Caution !
There is a spring in the spring bonnet. It may cause
injuries if the spring is derailing.
• Make sure tension in compression spring is slak-
kened!
Press in diaphragm with finger before inserting slip ring
Screw in filter cup hand-tight (without tools)
Interval: every 2 months
Do not forget to do a visual check of the ball valve.
Replace if it is dripping!
To be carried out by an installation company
Caution !
Do not use any cleaning agents containing solvents
and/or alcohol to clean the plastic parts!
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