Honeywell D15SN A Series, Installation Instructions Manual, Page: 8 / 33

MU1H-1057GE23 R0715 8 Honeywell GmbH
GB
9. Maintenance
In accordance with DIN EN806-5, the following measures
must be taken:
9.1. Inspection
9.1.1. Pressure Reducing Valve
1. Close shutoff valve on outlet
2. Check outlet pressure using a pressure meter when there
is zero through-flow
• If the pressure is increasing slowly, the valve may be
dirty or defective. In this instance, carry out servicing
and cleaning
3. Slowly open shutoff valve on outlet
9.2. Maintenance
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 hexagon nut on spring bonnet
5. Slacken tension in compression spring
• Turn control adjustment screw to the left (-) until it does
not move any more
6. Unscrew spring bonnet
7. Check the cartridge insert for fault-free condition and
replace insert or sealing parts if necessary.
8. Reassemble in reverse order
10. Disposal
• Housing made of ductile cast iron
(EN-GJS-400-15 EN1563), coated with PA (polyamide)
• Spring bonnet made of ductile cast iron
(EN-GJS-400-15 EN1563), coated with PA (polyamide)
• Cartridge insert made completely of low-lead (<2.2 % acc.
to DIN 50930 part 6) brass with stainless steel valve
spindle
• Spring steel adjustment spring
• Diaphragm and seals made of EPDM
• Groove ring and sealing disc made of high-quality PU
• Stainless steel screws and nuts
We recommend a planned maintenance contract with
an installation company
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!
Observe the local requirements regarding correct waste
recycling/disposal!
11. Troubleshooting
Problem Cause Remedy
Water is escaping from the spring
bonnet Diaphragm is faulty Replace diaphragm
Spring bonnet not screwed flush Retighten the screws
O-ring forgotten in the diaphragm piston
during assembly Insert O-ring
Too little or no water pressure Shutoff valves up- or downstream of the
pressure reducing valve are not fully open Open the shutoff valves fully
Pressure reducing valve is not set to the
desired outlet pressure Set outlet pressure
Pressure reducing valve is not fitted in flow
direction Fit pressure reducing valve in flow direction
(note direction of arrow on housing)