NK 295C - HONEYWELL - Free user manual and instructions

USER MANUAL NK 295C HONEYWELL

GB 1. Safety Guidelines

ding to a system of force balance. The piston force works against the spring force of the control valve. If the outlet pressure (back pressure) drops as a consequence of drawing water, leading to the piston force dropping as well, the now greater spring force will open the valve. The outlet pressure is higher again until the balance between piston and spring force is once again achieved. The inlet pressure has no influence in either opening or closing of the valve. Because of this, inlet pressure fluctuation does not influence the outlet pressure, thus providing inlet pressure balancing.

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 applications 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.

3. Application Medium Inlet pressure Outlet pressure Liquid category Backflow Preventer

2. Functional description The refilling combination combines backflow preventer, pressure reducing valve and ball valves in one appliance. The backflow preventer is a safety device in accordance with EN 1717 to protect systems against back pressure, back flow and back syphonage of nonpotable water into service pipe, plants and equipments. The backflow preventer is separated in three chambers (inlet, middle and outlet chamber). If no water is drawn from the downstream system, the backflow preventer is in normal position. The up- and downstream check valves and the discharge valve are closed. If water is drawn from the downstream system, the backflow preventer is in flow position. The check valves up- and downstream are opened and the discharge valve is closed. If the differential pressure between middle and inlet chambers is less than 10 % of the inlet pressure, the system disconnector moves into disconnect position (back suction). The inlet side backflow preventer closes and the discharge valve opens. There is no possibility to control the safety function by measuring. The pressure reducing valve reduces the pressure on the inlet side (admission pressure) to the level of the desired pressure on the outlet side (outlet pressure) in individual cases.

Spring-loaded pressure reducing valves work accorHoneywell GmbH Water without inhibitors min. 1.5 bar max. 10.0 bar 1.5-6 bar 3 (slightly toxic materials)

4. Technical data Installation position

horizontal pipework with discharge connection directed downwards Operating temperature max. 65°C Connection size HT 40 Discharge Connection size 1/2" AG

5. Scope of delivery The refilling combination consists of: • Shut off valve, up- and downstream • Complete backflow preventer with discharge connection, valve cartridge (incl. integrated check valve and discharge valve, upstream), integrated strainer upstream (mesh size approx. 0,5 mm) and check valve downstream • Complete pressure reducing valve with valve insert, spring hood (including adjuster knob), setpoint spring and pressure gauge

6. Assembly 6.1 Installations Guidelines • Install in horizontal pipework with discharge connection directed downwards • The installation may not take place in areas or ducts where poisonous gases or vapours may be present or where flooding can occur • The installation location must be ventilated well • The installation location should be protected against frost and be easily accessible 5

o Simplified maintenance and cleaning o Pressure gauge at the pressure reducing valve can be read off easily • Provide a straight section of pipework of at least five times the nominal valve size after the pressure reducing valve (in accordance with DIN 1988, Part 5) • The refilling combination has an integrated strainer - no separate strainer necessary o Refilling combination is protected against malfunction and corrosion damage resulting from ingress of foreign bodies, e.g. welding beads, sealing materials, metal cuttings and rust 6.2 Assembly instructions To avoid stagnating water, the refilling combination must be connected as directly as possible to the supply line! The guidelines of drinking water regulations apply for installation! 1. Thoroughly flush pipework 2. Remove the isolation shell 3. Install refilling combination • Install in horizontal pipework with discharge connection directed downwards • Note flow direction (indicated by arrow) o Install without tension or bending stresses 4. Attach drain pipe to discharge connection (plastic pipe HT 40) 5. Install isolation shell

We recommend a planned maintenance contract with an installation company In accordance with DIN EN 1717 a regular maintenance must be taken. 8.1 Inspection 8.1.1 Pressure reducing valve Interval: once a year To be carried out by an installation company or the operator. 1. Close ball valve on the outlet side of the refilling combination 2. Check outlet pressure on pressure gauge when no flow is occurring o If the pressure is increasing slowly, the valve may be dirty or defective. In this instance, carry out servicing and cleaning 3. Slowly open the ball valve on the outlet side of the refilling combination 8.1.2 System disconnector Interval: once a year To be carried out by an installation company or the operator. 1. Close shutoff valve on inlet 2. Open the drain point on the inlet side of the shut-off ball valve. o If the differential pressure between middle and inlet chambers is less than 10 % of the inlet pressure, the system disconnector moves into disconnect position (back suction). The inlet side backflow preventer closes and the discharge valve opens. Does not open the discharge valve Replace refilling combination! 3. Close the drain point on the inlet side of the shut-off ball valve 4. Slowly open shutoff valve on inlet

7. Commissioning 7.1 Setting outlet pressure 1. Close shut off valve on inlet and outlet 2. Slacken tension in compression spring o Insert the available adjuster knob and turn to the left 3. Open and close drain cock at the shut off ball valve downstream. Pressure reducing valve is decompressed. 4. Slowly open shutoff valve on inlet 5. Turn adjuster knob until the manometer shows the desired value. 6. Remove adjuster knob 7. Slowly open shutoff valve on outlet

Honeywell GmbH GB 9. Disposal

8.1.3 Leak-tightness Interval: once a year To be carried out by an installation company or the operator. 1. Open sampling point. Refilling combination changes into flow position. 2. Optical control refilling combination of location and tightness. If water exits at the refilling combination, call the technical customer support service!

• Dezincification-resistant brass housing • Discharge connection, valve cartridge, valve insert and spring hood in high-grade synthetic material • High-grade synthetic material check valve • Seals in NBR • Spring steel adjustment spring • Isolation shell in EPP Observe the local requirements regarding correct waste recycling/disposal!

10. Troubleshooting Problem Beating sounds

Non return valve is faulty

Call our Technical Customer Services

Water is escaping from refilling Sealing elements are contaminated or combination worn

Call our Technical Customer Services

No or too small water flow rate Refilling combination is not fitted in flow direction

Fit refilling combination in flow direction (note direction of arrow on housing)

Ball valves up- or downstream of refilling Open ball valves entirely combination are not fully open Drain cocks at the shut off ball valves upand downstream of the refilling combina- Close drain cocks tion are not fully close Pressure reducing valve is not set to the desired outlet pressure Refilling combination change not into flow position

Check supply pressure with reaction pres- Call our Technical Customer sure Services

Check plant Refilling combination opens and plant downstream leaky closes in short time intervals Call our Technical Customer Non return valve is contaminated or worn (pump) Services

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 MU1H-1548GE23 R0509 Subject to change © 2007 Honeywell GmbH

Safety Guidelines 5 Functional description 5 Application 5 Technical data 5 Scope of delivery 5 Assembly 5 Commissioning 6 Maintenance 6 Disposal 7 Troubleshooting 7