Honeywell GmbH
8
MU1H-1242GE23 R0714
GB
8.3. Cleaning
1. Procedure see Maintenance
9. Disposal
• Ductile iron housing, powder coated with polyamide
• Stainless steel and brass check valves (DN65-200)
• EPDM diaphragm
• EPDM sealing washers
• Brass discharge valve
• Polyethylene pressure control line with stainless steel
braid
• Chrome plated brass ball valves
• To be carried out by an installation company
• To be carried out by the operator
Do not use any cleansers that contain solvents and/or
alcohol for cleaning the plastic parts, because this can
cause damage to the plastic components - water
damage could result.
Detergents must not be allowed to enter the environ-
ment or the sewerage system!
Observe the local requirements regarding correct waste
recycling/disposal!
10. Troubleshooting
Disturbance
Cause
Remedy
Discharge valve opens without
apparent reason
Pressure strokes in water supply system Install a pressure reducing valve upstream the
backflow preventer
Fluctuating inlet pressure
Install a pressure reducing valve upstream the
backflow preventer
Inlet check valve and/or discharge valves
are dirty
Remove check valve or discharge valve and
clean it
Leaky inlet check valve
Replace check valve
Discharge valve don’t close
Deposits on valve seat
Remove discharge valve, clean or replace it
Damaged ’o’ring
Remove discharge valve and replace ’o’ring
Leaky discharge valve
Remove discharge valve, clean or replace it
Discharge valve don’t open
Blocked pressure control pipe
Remove control pipe and clean it
