Troubleshooting - Honeywell FN74C Einbauanleitung

11. Troubleshooting

11.1 FK74C/FKN74C
Problem
Water is escaping from the spring
bonnet
Too little or no water pressure
The outlet pressure set does not
remain constant
11.2 F74C/FN74C
Problem
Too little or no water pressure
12. Spare Parts
No.Description
1 Valve insert complete
2 Filter insert complete
Filter mesh 100 μm
Filter mesh 50 μm
Filter mesh 200 μm
3 Clear filter bowl
complete
4 Pressure gauge
(0 - 16 bar)
5 Double ring wrench
for removing filter
bowl (no fig.)
Honeywell GmbH
Cause
Diaphragm in valve insert is faulty
Shutoff valves upstream or downstream
from filter not fully open
Pressure reducing valve is not set to the
desired outlet pressure
Filter mesh dirty
Not fitted in flow direction
Filter mesh dirty
Valve insert, sealing ring or edge of
nozzle is contaminated or worn
Rising pressure on outlet (e.g. in boiler) Check check valve, safety group etc.
Cause
Shutoff valves upstream or downstream
from filter not fully open
Filter mesh dirty
Not fitted in flow direction
Dimension Part No.
/ " - 1 / " D06FA-1B
3 1
4 4
/ " - 1 / " AF74-1A
3 1
4 4
/ " - 1 / " AF74-1C
3 1
4 4
/ " - 1 / " AF74-1D
3 1
4 4
/ " - 1 / " KF74-1A
3 1
4 4
M07M-A16
/ " - 1 / " ZR10K-3/4
3 1
4 4
GB
Remedy
Replace valve insert
Open the shutoff valves fully
Set outlet pressure
Reverse rinsing
Fit filter in flow direction (note direction of arrow
on housing)
Reverse rinsing
Replace valve insert
Remedy
Open the shutoff valves fully
Reverse rinsing
Fit filter in flow direction
13. Accessories
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
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)
9
/ " - 2"
1
2
MU1H-1149GE23 R0710