Honeywell GmbH
9
MU1H-1149GE23 R0710
GB
11. Troubleshooting
11.1 FK74C/FKN74C
11.2 F74C/FN74C
Problem
Cause
Remedy
Water is escaping from the spring
bonnet
Diaphragm in valve insert is faulty
Replace valve insert
Too little or no water pressure
Shutoff valves upstream or downstream
from filter not fully open
Open the shutoff valves fully
Pressure reducing valve is not set to the
desired outlet pressure
Set outlet pressure
Filter mesh dirty
Reverse rinsing
Not fitted in flow direction
Fit filter in flow direction (note direction of arrow
on housing)
The outlet pressure set does not
remain constant
Filter mesh dirty
Reverse rinsing
Valve insert, sealing ring or edge of
nozzle is contaminated or worn
Replace valve insert
Rising pressure on outlet (e.g. in boiler) Check check valve, safety group etc.
Problem
Cause
Remedy
Too little or no water pressure
Shutoff valves upstream or downstream
from filter not fully open
Open the shutoff valves fully
Filter mesh dirty
Reverse rinsing
Not fitted in flow direction
Fit filter in flow direction
12. Spare Parts
13. Accessories
No.Description
Dimension Part No.
1
Valve insert complete
3
/
4
" - 1
1
/
4
"
D06FA-1B
2
Filter insert complete
Filter mesh 100
μ
m
3
/
4
" - 1
1
/
4
"
AF74-1A
Filter mesh 50
μ
m
3
/
4
" - 1
1
/
4
"
AF74-1C
Filter mesh 200
μ
m
3
/
4
" - 1
1
/
4
"
AF74-1D
3
Clear filter bowl
3
/
4
" - 1
1
/
4
"
KF74-1A
complete
4
Pressure gauge
M07M-A16
(0 - 16 bar)
5
Double ring wrench
for removing filter
bowl (no fig.)
3
/
4
" - 1
1
/
4
" ZR10K-3/4
Z74S
Automatic reverse rinsing actuator
For automatic filter cleaning at presettable inter-
vals
Z74A
Automatic reverse rinsing actuator
For automatic filter cleaning at presettable inter-
vals
DA74C
Rotatable connector piece
For connection of retrofit filters and filter combina-
tions
VST06-B Connection set
Solder connections
VST06-A Connection set
Threaded connections
RV277
Inlet check valve
Available in sizes R
1
/
2
" - 2"
ZA76C
Connector piece
For conversion of the fine filters with rotatable
connector pieces (1 1/4" and 1 1/2") into retrofit
filter combinations (Converts 63 mm hole centres
to 45 mm hole centres)
