GB
MU0H-1264GE23 R0520
5
5.2 Maintenance
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
environment or the sewerage system!
Interval: every 12 months
See chapter 10 Maintenance Report
Test set-up
Mount the backflow preventer in the testing equipment. Open
all the valves, to bleed the system. Close valve 3. Check that
the backflow preventer is sealed.
5.2.1 Inspection of check valve on input
side
1.
Close valve 2
2.
Wait 10 seconds and observe the differential
pressure. If it is constant, the check valve is airtight.
Make a note of the differential pressure
If the differential pressure = 0, the seal on the input side is
damaged or soiled. Follow the instructions in chapter 5.2.3
Maintenance.
5.2.2 Inspection of discharge valve
1.
Close valve 2
2.
Close valve 1
3.
Slowly open valve 3 and observe the differential
pressure. The discharge valve must respond (begin to
drop) before the differential pressure exceeds 0.14
bar. Make a note of the differential pressure at which
the discharge valve responds (drops).
If the differential pressure is <0.14 bar at the response
moment, follow the instructions in chapter 5.2.3 Maintenance.
5.2.3 Maintenance
Note:
For exploded drawing see chapter 11
1.
Fix the backflow preventer on the key area of the
housing and open the cover on the output side with
the help of a tape puller
2.
Remove the springs and piston
3.
Clean all interior parts and the running surface with
clear water and check that they are in good condition.
4.
If necessary, exchange all seals and pistons. When
dismantling, ensure that the sealing faces in the base
of the groove are not damaged.
5.
Lightly grease the seals.
6.
Reassemble in reverse order.
7.
6
Disposal
Observe the local requirements regarding correct waste
recycling/disposal!
7
Troubleshooting
8
Spare Parts
For Spare Parts visit homecomfort.resideo.com/europe
9
Accessories
For Accessories visit homecomfort.resideo.com/europe
Problem
Cause
Remedy
Discharge valve opens for no apparent
reason
Fluctuating inlet pressure
-
Pressure surge on the secondary side
-
Inlet check valve seal or discharge valve
seal soiled or defective
Remove and clean piston
Discharge valve does not close
Seal damaged
Remove piston and replace seal
Running surface is soiled
Remove and clean piston
