FK74C
Construction
The filter combination comprises:
• Housing with pressure gauge
• Spring bonnet with adjustment knob
• Valve insert complete with diaphragm and valve seat
• Rotatable connector piece (FK74C only)
• Threaded union connectors (FK74C only)
• Fine filter in clear filter bowl
• Ball valve with drain connection
• Double ring wrench
Materials
• High quality synthetic material housing
• Brass threaded connections
• High quality synthetic material spring bonnet, valve insert and
filter mesh carrier
• Red bronze connector piece (FK74C only)
• Stainless steel fine filter
EN0H-1149GE23 R1009 • Subject to change
• Shock-resistant, clear transparent synthetic material filter
bowl
• Fibre-reinforced NBR diaphragm
• NBR seals
FKN74C
FK74C/FKN74C
Reverse rinsing filter combination
Product specification sheet
Application
The FK74C/FKN74C filter combinations comprise reverse rinsing
filter and pressure reducing valve in one appliance. They ensure
a continuous supply of filtered water. The fine filter stops the
ingress of foreign bodies, for example rust particles, strands of
hemp and grains of sand. The pressure reducing valve prevents
pressure damage and reduces water consumption.
FK74C/FKN74C filter combinations are fitted in systems where a
pressure reducing valve is required. Both horizontal and vertical
installation is possible.
Special Features
• DIN/DVGW approved
• Inlet pressure balancing - fluctuating inlet pressure does not
influence outlet pressure
• Filtered water supplied even during reverse rinsing
• Patented reverse rinsing system - fast and thorough cleaning
of the filter with small amount of water
• Memory ring indicates when next manual reverse rinsing is
due
• Automatic reverse rinsing actuator with bayonet connector
can be retrofitted
• Large filter surface
• Shock resistant clear synthetic material filter bowl enables
easy checking of filter contamination
• Filter and complete filter bowl are replaceable
• The valve insert is of high quality synthetic material and can
be fully exchanged
• Standardised discharge connection
• Meets KTW recommendations for potable water
Range of Application
Medium Water
Inlet pressure Maximum 16.0 bar
Outlet pressure 1.5 - 6.0 bar
The filter is constructed for drinking water installations. In case of
a process water application the filter has to be proven individually.
Technical Data
Installation position Vertical or horizontal,
with filter bowl downwards
Operating pressure Minimum 1.5 bar
Operating temperature Maximum 30 °C
Connection size
3
/4", 1", 11/4"
www.honeywell.com 11
FK74C/FKN74C Reverse rinsing filter combination
Connection size DA74C R3/4"1"11/4"
Weight approx. kg 2.9 3.5 3.8
Dimensions mm
H 395 395 395
h 285 285 285
T 150 150 150
t666666
r272731
D 105 105 105
I 90 100 105
L 162 184 203
-value 5.5 6.0 6.5
k
vs
DIN/DVGW Approval No. DW-9311 AT 2316
Method of Operation
The filter combination combines reverse rinsing filter and pressure reducing valve in one appliance.
The filter insert comprises an upper part and a lower combination
section. When in the „filtering“ position, the small upper filter is
closed so that the water can only pass through the main filter
from outside to inside. When the ball valve is opened for reverse
rinsing, the filter is pushed downwards until the water supply to
the outer side of the main filter is stopped. Simultaneously, the
water flow is opened to the upper part of the filter. The water
needed for cleaning the filter passes through the upper sieve, the
rotating impeller and the main filter from inside to outside. By this
means, the filter is fully cleaned over its whole surface area at the
full inlet pressure. The filter automatically switches over to the
operating position when the ball valve is closed again.
The integral pressure reducing valve functions on a balanced
force principle whereby the force exerted by a diaphragm is
balanced against the force of an adjustment spring. The inlet
pressure has no influence on opening or closing of the valve. Inlet
pressure fluctuation does not therefore affect the outlet pressure.
Options
FK74C-...AA = Filter mesh size 100 µm, incl. rotatable connector
piece DA74C with threaded male connections
FK74C-...AC = Filter mesh size 50 µm, incl. rotatable connector
piece DA74C with threaded male connections
FK74C-...AD = Filter mesh size 200 µm, incl. rotatable connector
piece DA74C with threaded male connections
Connection size
FKN74C-1A = Filter mesh size 100 µm; rotatable connector
piece DA74C has to be ordered separately - see
accessories
FKN74C-1C = Filter mesh size 50 µm; rotatable connector piece
DA74C has to be ordered separately - see accessories
Z11S
VST06-A
RV277
12 www.honeywell.com
DA74C
VST06-B
ZA76C
Accessories
Z11S Automatic reverse rinsing actuator
For automatic filter cleaning at presettable intervals
DA74C Rotatable connector piece
For connection of retrofit filters and filter combinations
VST06-B Connection set
Solder connections
VST06-A Connection set
Threaded connections
RV277 Inlet check valve
1
Available in sizes R
/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)
EN0H-1149GE23 R1009 • Subject to change
Installation Example
FK74C/FKN74C Reverse rinsing filter combination
Installation Guidelines
• Install in horizontal or vertical pipework with filter bowl
downwards
o This position ensures optimum filter efficiency
• Install shutoff valves
• Ensure good access
o Pressure gauge can be read off easily
o Degree of contamination can be seen with clear filter bowl
o Simplifies maintenance and inspection
• The installation location should be protected against frost
• Fit immediately after water meter
o Corresponds to DIN 1988, Part 2
• It is recommended that a straight section of pipework at least
five times the nominal valve size is provided after the filter
combination
Flow Diagram
Typical Applications
Filter combinations of this type are suitable for all types of household installations. They can also be used for commercial and
industrial applications within the limits of their specifications.
Filter combinations of this type are installed:
• Where there is existing metal or plastics pipework
• For installation in horizontal or vertical pipework
• As replacement for an existing filter
• Where space is limited
• For protection against noise when the static pressure at take
off points exceeds 5.0 bar (DIN 4109)
• If the static pressure exceeds the maximum permissible
operating pressure of an installation
• If pressure fluctuations in the downstream system must be
avoided
• If the downstream system includes appliances which must be
protected against dirt
EN0H-1149GE23 R1009 • Subject to change
www.honeywell.com 13
FK74C/FKN74C Reverse rinsing filter combination
FK74C
Spare Parts
Filter combination FK74C/FKN74C (From 1995 onwards)
No. Description Dimension Part No.
FKN74C
1
1 Valve insert complete3/4" - 11/4"D06FA-1B
2 Filter insert complete
Filter mesh 100 µm
Filter mesh 50 µm
Filter mesh 200 µm
3 Clear filter bowl
3
/4" - 11/4" AF74-1A
3
/4" - 11/4" AF74-1C
3
/4" - 11/4" AF74-1D
3
/4" - 11/4"KF74-1A
complete
4 Pressure gauge M07M-A16
4
2
(0 - 16 bar)
5 Double ring wrench
for removing filter
bowl (no fig.)
3
/4" - 11/4" ZR10K-3/4
3
1
4
2
3
Automation and Control Solutions
Honeywell GmbH
Hardhofweg
D-74821 Mosbach
Phone: (49) 6261 810
Fax: (49) 6261 81309
http://europe.hbc.honeywell.com
www.honeywell.com
Manufactured for and on behalf of the
Environmental and Combustion Controls Division
of Honeywell Technologies Sàrl, Rolle, Z.A. La
Pièce 16, Switzerland by its Authorised Representative Honeywell GmbH
EN0H-1149GE23 R1009
Subject to change without notice
© 2009 Honeywell GmbH
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