NK 295C - Faucets HONEYWELL - Free user manual and instructions

Product type	Filling combination (system separator, pressure reducer, and integrated shut-off valve)
Brand	HONEYWELL
Model	NK 295C
Category	Valves
Mounting position	Horizontal, drain connection downward
Max operating temperature	65°C
Drain connection	HT 40 (plastic pipe)
Connection dimensions	1/2" AG
Permissible fluid	Water without inhibitors
Liquid category	3 (low toxicity)
Disconnector type	CA (conforming to DIN EN 1717)
Body material	Dezincification-resistant brass
Seal material	NBR
Spring material	Spring steel
Insulating jacket	Expanded polypropylene
Integrated filter basket	Yes, mesh ~0.5 mm
Main function	Protection against backflow (pressure, flow, siphonage) and downstream pressure regulation
Disconnector maintenance interval	Once a year
Pressure reducer maintenance interval	Once a year
Max upstream pressure	Not specified in the manual, but typically 16 bar (estimate)
Downstream pressure adjustment range	Adjustable as needed (indicated on manometer)

Frequently Asked Questions - NK 295C HONEYWELL

How to install the NK 295C filling combination?

Mount it horizontally with the drain connection facing downward. Flush the pipe before installation. Follow the flow direction indicated by the arrow. Install a stabilization section of at least 5 x DN after the device. Secure the drain pipe in HT 40.

How to adjust the downstream pressure of the pressure reducer?

Close the upstream and downstream shut-off valves. Release the spring by turning the adjusting knob to the left. Open and close the downstream drain to depressurize. Slowly open the upstream valve, then turn the adjusting knob to the desired pressure displayed on the manometer. Remove the knob and slowly open the downstream valve.

What is the annual maintenance of the disconnector?

Close the upstream valve and open the drain on the inlet side. If the purge valve does not open, the disconnector is defective and must be replaced. Close the drain and slowly reopen the upstream valve. Perform this check once a year.

What to do in case of repeated noises?

Repeated noises are often due to a defective check valve. Contact Honeywell technical customer service.

How to maintain the pressure reducer?

Check the downstream pressure annually on the manometer at zero flow. If the pressure slowly increases, clean or replace the internal components. Call a qualified installer if necessary.

Which fluid can I use with the NK 295C?

Only water without inhibitors of liquid category 3 (low toxicity). Do not use for aggressive or corrosive fluids.

Why is water flowing from the filling combination?

This may be due to dirty or defective seals or incorrect installation (reversed flow direction). Contact technical support.

What to do if the flow is low or zero?

Check that the shut-off valves are fully open and that the drains are properly closed. Make sure the downstream pressure is correctly set. If the problem persists, check the supply pressure.

Does the NK 295C pump (rapid opening and closing)?

Pumping indicates a leak in the downstream installation or a dirty/defective check valve. Check the installation and clean or replace the valve.

What are the materials of the filling combination?

The body is made of dezincification-resistant brass, seals of NBR, springs of steel, and the insulating jacket of expanded polypropylene. The valves and cartridge are made of high-quality plastic.

USER MANUAL NK 295C HONEYWELL

Keep instructions for later use!

1. Follow the installation instructions.
2. Use the appliance
   according to its intended use
3. in good condition
   with due regard to safety and risk of danger.
4. 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.
5. Please take note that any assembly, commissioning, servicing and adjustment work may only be carried out by authorized persons.
6. Immediately rectify any malfunctions which may influence safety.

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 non-potable 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 accor

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.

3. Application

Medium	Water without inhibitors
Inlet pressure	min. 1.5 bar max. 10.0 bar
Outlet pressure	1.5-6 bar
Liquid category	3 (slightly toxic materials)
Backflow Preventer

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

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

1. Attach drain pipe to discharge connection (plastic pipe HT 40)
2. Install isolation shell

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.

1. Slowly open shutoff valve on inlet
2. Turn adjuster knob until the manometer shows the desired value.
3. Remove adjuster knob
4. Slowly open shutoff valve on outlet

8. Maintenance

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

1. 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!

1. Close the drain point on the inlet side of the shut-off ball valve
2. Slowly open shutoff valve on inlet

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!

9. Disposal

• 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	Cause	Remedy
Beating sounds	Non return valve is faulty	Call our Technical Customer Services
Water is escaping from refilling combination	Sealing elements are contaminated or 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 combination are not fully open	Open ball valves entirely
	Drain cocks at the shut off ball valves up- and downstream of the refilling combination are not fully close	Close drain cocks
	Pressure reducing valve is not set to the desired outlet pressure	Set outlet pressure
Refilling combination change not into flow position	Check supply pressure with reaction pres-sure	Call our Technical Customer Services
Refilling combination opens and closes in short time intervals (pump)	plant downstream leaky	Check plant
	Non return valve is contaminated or worn	Call our Technical Customer Services

Méodium voda bez inhibitoru

Automation and Control Solutions

Honeywell GmbH

Hardhofweg

D-74821 Mosbach

Phone: [phone]

Fax: [phone]

http://europe.hbc.honeywell.com

www.honeywell.com

Manufactured for and on behalf of the

Environmental and Combustion Controls Division of

16, Switzerland by its Authorised Representative Honeywell GmbH

MU1H-1548GE23 R0509

Subject to change

© 2007 Honeywell GmbH

Honeywell

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7.1

8.1.1

8.1.2

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1. Safety Guidelines 5
2. Functional description 5
3. Application 5
4. Technical data 5
5. Scope of delivery 5
6. Assembly 5
7. Commissioning 6
8. Maintenance 6
9. Disposal 7
10. Troubleshooting 7

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