resideo FKN74C Fine Filter Instruction Manual

resideo FKN74C Fine Filter

Safety Guidelines

1. Follow the installation instructions.
2. Use the appliance
   • according to its intended use
   • in good condition
   • with due regard to safety and risk of danger.
3. Note that the appliance is exclusively for use in the appli-cations detailed in these installation instructions. Any other use will not be considered to comply with requirements and would invalidate the warranty.
4. Please take note that any assembly, commissioning, servicing and adjustment work may only be carried out by authorized persons.
5. Immediately rectify any malfunctions which may influence safety.

Functional description

The filter insert comprises an upper part and a lower combi-nation 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 pres-sure. The filter automatically switches over to the operating position when the ball valve is closed again.
The filter combination combines reverse rinsing filter and pressure reducing valve in one appliance.
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.

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

Scope of delivery

The filter combinations FK74C and FKN74C 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

The fine filters F74C and FN74C comprises:

• Housing with pressure gauge
• Threaded connections
• Rotatable connector piece (F74C only)
• Fine filter in clear filter bowl
• Ball valve with drain connection
• Double wring wrench

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
• F74C-…AA = Filter mesh size 100 μm, incl. rotatable connector piece DA74C with threaded male connections
• F74C-…AC = Filter mesh size 50 μm, incl. rotatable connector piece DA74C with threaded male connections
• F74C-…AD = Filter mesh size 200 μm, incl. rotatable connector piece DA74C with threaded male connections
• FN74C-1A = Filter mesh size 100 μm; rotatable connector piece DA74C has to be ordered separately – see accessories
• FN74C-1C = Filter mesh size 50 μm; rotatable connector piece DA74C has to be ordered separately – see accessories

Assembly

Installations Guidelines

• Install in horizontal or vertical pipework with filter bowl downwards
• This position ensures optimum filter efficiency
• Install shutoff valves
• Ensure good access
• Pressure gauge can be read off easily
• Degree of contamination can be seen with clear filter bowl
• Simplifies maintenance and inspection
• The installation location should be protected against frost
• Fit immediately after water meter
• 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

Assembly instructions

1. Thoroughly flush pipework
2. Install rotatable connector piece
   • Note flow direction
   • Install without tension or bending stresses When connecting to an existing flange of another make ensure that the inlet flow is through the outer ring of holes. If this is not so, the whole connection piece must be installed the other way round, even if the arrow does not then indicate the actual flow direction. If the flange is threaded, the threaded holes must be drilled out to a diameter of 6.3 mm.
3. Install filter to rotatable connector
4. Seal in pressure gauge

Discharge of reverse rinsing water

The reverse rinsing water must be routed to the drain channel in such a way that no backwater can occur.

To do this there are 3 options:

1. Direct connection:
   • Connector DN 50/70 as well as the necessary pipes and siphon (3 elbows 90°) in DN 70.
2. Discharge into floor drain
3. Drain into open container.
   Filter size: Reverse rinsing volume*
   3/4″: 12 litre
   1″ and 1 1/4″: 15 litre
   at 4 bar inlet pressure and 3 x 3 seconds reverse rinsing duration

Commissioning

Setting outlet pressure (FK74C/FKN74C only)

Note: Set outlet pressure min. 1 bar under inlet pressure.

1. Close shutoff valve on inlet

2. Release pressure on outlet side (e.g. through water tap)

3. Close shutoff valve on outlet

4. Loosen slotted screw
   Do not remove slotted screw

5. Slacken tension in compression spring
   Turn control handle to the left (-) until it does not move any more

6. Slowly open shutoff valve on inlet

7. Turn adjuster knob until the manometer shows the desired value.

8. Retighten slotted screw

9. Slowly open shutoff valve on outlet

Reverse rinsing

During reverse rinsing, an inlet pressure of at least 1.5 bar is required. The reverse rinsing interval depends on the degree of dirt in the water. At the latest every 2 months, reverse rinsing should be carried out according to DIN 1988, Part 8. To ensure convenient and regular adherence to the reverse rinsing interval, we recommend installing an automated reverse rinsing system Z74S / Z74A (see accessories).
Note: Filtered water can also be tapped during reverse rinsing.

Manual reverse rinsing
If reverse rinsing water is not to be discharged via a direct connection, a collecting container must be positioned beneath before reverse rinsing.

1. Open ball valve by turning the reverse rinsing button to the stop point
   Select bar must be upright
   The patented reverse rinsing system starts

2. Close ball valve again after approx. 3 seconds. Repeat procedure three times
   If the filter is extremely dirty, the procedure may have to be repeated additional times With aid of the memory ring, the next deadline for manual reverse rinsing can be booked.

Automatic reverse rinsing
The automated reverse rinsing system Z74A resp. Z74S is available as an accessory. The automated system reliably takes over reverse rinsing of the filter at intervals which can be set between 4minutes and 3months. (Z74A) resp. at a fixed intervall of 45 days (Z74S).

Maintenance

Note: We recommend a planned maintenance contract with an installation company In accordance with DIN 1988, part 8, the following measures must be taken:

Inspection

Pressure reducing valve (FK74C/FKN74C)
Note: Interval: once a year

1. Close shut off valve on outlet

2. Check back pressure using a pressure meter when there is zero through-flow
   If the pressure is increasing slowly, the valve may be dirty or defective. In this instance, carry out servicing and cleaning

3. Slowly open shutoff valve on outlet

Filter
Interval: every 2 months 

• The filter must be cleaned by reverse rinsing regularly, at the latest every 2 months
• Non-compliance can lead to the filter becoming blocked This results in a drop in pressure and decreasing water flow
• The filter meshes are made of stainless steel. A red coating as a consequence of rust from the pipelines has no influence on function or the way the filter works
  Note: Do not forget to do a visual check of the ball valve. Replace if it is dripping!

Maintenance

Pressure reducing valve
Frequency: every 1-3 years (depending on local operating conditions) To be carried out by an installation company

1. Close shutoff valve on inlet

2. Release pressure on outlet side (e.g. through water tap)

3. Close shutoff valve on outlet

4. Loosen slotted screw
   Do not remove slotted screw
   Caution! There is a spring in the spring bonnet. It may cause injuries if the spring is derailing. Make sure tension in compression spring is slak- kened!

5. Slacken tension in compression spring
   Turn control handle to the left (-) until it does not move any more
   Do not turn in too far!

6. Unscrew spring bonnet
   Use double ring wrench ZR10K

7. Remove slip ring

8. Remove valve insert with a pair of pliers

9. Unscrew filter cup and guide piece
   Use double ring wrench ZR10K

10. Remove slotted ring

11. Check that sealing ring, edge of nozzle and slotted ring are in good condition, and if necessary replace the entire valve insert

12. Reassemble in reverse order
    Note: Press in diaphragm with finger before inserting slip ring Screw in filter bowl hand-tight (without tools) 13.Set outlet pressure

Cleaning

Caution! Do not use any cleaning agents containing solvents and/or alcohol to clean the plastic parts!
If necessary, the filter bowl and the filter can be cleaned.
Frequency: every 6 month (depending on local opera-ting conditions)
To be carried out by an installation company Detergents must not be allowed to enter the environment or the sewerage system!

1. Close shutoff valve on inlet

2. Release pressure on outlet side (e.g. through water tap)

3. Close shutoff valve on outlet

4. Unscrew filter bowl
   Use double ring wrench ZR10K

5. Remove filter, clean and reinsert

6. Place O-ring onto filter bowl

7. Screw in filter bowl hand-tight (without tools)

8. Slowly open shutoff valve on inlet

9. Slowly open shutoff valve on outlet

Disposal

• High quality synthetic material housing
• Brass threaded connections
• High quality synthetic material spring bonnet, valve insert and filter mesh carrier (FK74C and FKN74C only)
• Red bronze connector piece (FK74C and F74C only)
• Stainless steel fine filter
• Shock-resistant, clear transparent synthetic material filter bowl
• NBR seals

Note: Observe the local requirements regarding correct waste recycling/disposal!

Troubleshooting

FK74C/FKN74C

Spare Parts

Accessories

• Z74S: Automatic reverse rinsing actuator
  For automatic filter cleaning at presettable intervals

• Z74A: Automatic reverse rinsing actuator
  For automatic filter cleaning at presettable intervals

• DA74C: Rotatable connector piece
  For connection of retrofit filters and filter combination

• VST06-B Connection set
  Solder connections

• VST06-A Connection set
  Threaded connections

• RV277 Inlet check valve
  Available in sizes R1/2″ – 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)

Accessories 

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