Product Range • 20111 psi 1.5 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100 120 40 4 2 50 kPa 10 Gauge 50 20 30 60 70 80 90 100 200 300 400 500 600 700 800 9 10 3 900 Head of Water meters feet 1 3.5 4 5 6 7 8 20 30 40 MULTIPLY BY TO CONVERT INTO UNIT TO CONVERT kPa bar m H2O psi ft H2O 1 kPa 2 1 0.01 0.10197 0.1450 0.3346 1 bar 100 1 10.197 14.50 33.455 5 6 7 8 9 10 11 12 PRESSURE CONVERSION 1 m H2O 9.807 0.09807 1 1.4223 3.2808 ��.� �.� �.� 1 psi 6.895 0.06895 0.7031 1 2.3067 Pressure 1 ft H2O 2.989 0.02989 0.3048 0.4335 1 Quick pressure conversions can be read off scales. e.g. 7.6 mH2O = 25 ftH2O = 75 kPa = 11 psi approx. 1 3 4 5 Length mm in 10 20 30 40 60 70 80 90 100 110 120 130 140 150 6 1000 140 INTRODUCTION NEFA valves are designed and manufactured to New Zealand Standards and comply with the requirements of the New Zealand Building Code. This booklet has been compiled to assist you with the installation of NEFA products. Installation of valves should always be carried out by a qualified plumber and must comply with the requirements of the New Zealand Building Code and Local Territorial Authority. Refer to the Building Code Compliance Document G12 Water Supplies available from the Department of Building and Housing. While every effort has been made to ensure the accuracy of information included in this publication, the publisher takes no responsibility for errors or omissions. This publication is copyright protected and all rights are reserved. INDEX Pressure Reducing Feed Valve. . . . . . . . . . . 4 Pressure and Vacuum Relief Valve . . . . . . . . 4 Temperature Limiting Valve . . . . . . . . . . . . . 8 Pressure Limiting Valve . . . . . . . . . . . . . . 10 Mains Pressure Inlet Control Valve . . . . . . . . 12 Mains Pressure Tempering Valve . . . . . . . . . 14 High Performance Solar Tempering Valve. . . . 16 Cold Water Expansion Valve. . . . . . . . . . . 18 15mm 3-in-1 Filter Stopcock & Non-Return Valve . . . 20 20mm 3-in-1 Filter Stopcock & Non-Return Valve . . . 22 Water Heater Installation Checklist . . . . . . . 24 Mains Pressure Installation Guidelines . . . . . . 25 Low Pressure Installation Guidelines . . . . . . . 26 Troubleshooting Guide . . . . . . . . . . . . . . 30 NEFA Valve Packs . . . . . . . . . . . . . . . . . 32 NEFA Spare Parts & Service Kits . . . . . . . . . 34 3 6 m/12.FEATURES •• •• •• •• •• •• •• Forged Dezincification Resistant (DR) brass body Superior flow rate Adjustable outlet pressure Silicone diaphragm and Jumper Washer Acetal valve seat Easily serviced Complies with the requirements of NZBC G12 SPECIFICATIONS •• •• •• •• •• •• •• Conforms to NZS:4608 Factory set outlet pressures: 3.2 m 300 kPa 42 l/min 43 l/min 500 kPa 50 l/min 55 l/min 700 kPa 60 l/min 64 l/min Connections: Inlet 15 mm (½ BSP) male Outlet 20 mm (¾ BSP) male Overall length 145 mm Main body diameter 125 mm •• •• •• PRODUCT CODES NFV3715 NFV7615 NFV12215 3.Settable from 2.5 m to 11 m Adjustment 1 turn approx 600 mm head For 12.2 m NEFA Pressure Reducing Feed Valve NEFA Pressure Reducing Feed Valve NEFA Pressure Reducing Feed Valve 4 .Settable from 3 m to 18 m Adjustment 1 turn approx 1 m head Flow Rates at constant inlet pressure Inlet kPa 3.6 m / 12.7 m 7.7 m 7.7 m / 7.6 m 12.7 m/7.6 m .2 m .2 m Maximum inlet pressure 2000 kPa Maximum temperature 60°C For 3. If they are installed level undo lock nut and turn adjustment screw two turns out of body. adjusting screw 5 .29 for detailed instructions. Refer to Installation Guide.PRESSURE REDUCING FEED VALVE INSTALLATION •• •• •• •• The NEFA Pressure Reducing Feed Valve can be installed in any orientation. The valve should be installed where it can be easily accessed and when inside buildings above a safe tray. But for ease of service install with the cap to the top. IMPORTANT •• •• The water supply to a low pressure storage water heater must not exceed the maximum working pressure stated by the manufacturer. Install a NEFA 3-in-1 Filter Stopcock before the NEFA Feed Valve. bridge jumper washer jet cap fork diaphragm Fig 1. The valve should not be installed in the ground or in a situation where it could be subject to freezing. The NEFA Pressure Reducing Valve (Feed Valve) regulates the water supply pressure to the water heater to a suitable safe value. Factory setting allows for the NEFA Pressure and Vacuum Relief Valve to be fitted 1m above the NEFA Feed Valve. Pages 24 . 7 m 7.2 m NEFA Pressure & Vacuum Relief Valve NEFA Pressure & Vacuum Relief Valve NEFA Pressure & Vacuum Relief Valve 6 .6 m/12. providing air break in drain line Complies with the requirements of NZBCG12 SPECIFICATIONS •• •• •• •• •• •• •• •• Conforms to NZS:4608 Factory set pressures 3.2 m Heat Rating 8 kW Maximum temperature 99°C Connections: Inlet: 20 mm (¾ BSP) male Drain: 15 mm (½ BSP) male Integral vacuum relief Overall length 105 mm Diameter 85mm PRODUCT CODES NRV37 NRV76 NRV122 3.FEATURES •• •• •• •• •• •• •• Forged Dezincification Resistant (DR) brass body Easy to service Withstands boiling temperatures Tamper proof. prevents cylinder implosion on draining Integral vacuum break in outlet body. relief pressure permanently set Vacuum breaking jumper.6 m 12.7 m/7. the integral vacuum relief vent must be to the top.e. Refer to Installation Guide. as in an under sink installation.PRESSURE & VACUUM RELIEF VALVE INSTALLATION •• •• The NEFA Relief Valve must only be installed on a thermostatically controlled hot water system. allowance is made for the NEFA Relief Valve to be fitted 1 m above the NEFA Pressure Reducing Feed Valve. spring 7 . IMPORTANT •• •• •• •• •• •• •• When factory set. When draining a water heating cylinder. If they are installed at the same level. or other vented water will not cause a hazard or a nuisance. Maximum heating capacity 8 kW per valve The drain line must not rise above the NEFA Relief Valve. A NEFA Relief Valve must not be installed where there is a risk of the valve freezing. Pages 24 . to a point where the outlet cannot be obstructed or blocked and where expansion. It should run at a down grade out to atmosphere. The NEFA Relief Valve must not be installed on to a cylinder with an uncontrolled heat source i. It should not exceed 9 m in length and include not more than three 90° bends.29 for detailed instructions. flap diaphragm assembly vacuum break Fig 2. If the NEFA Relief Valve is fitted in a horizontal pipe run. Springs are not replaceable. solar or wetback. If the vacuum relief vent plug supplied with the NEFA Relief Valve is to be fitted to the Relief Valve body an alternative air break must be fitted in the drain line. the NEFA Relief Valve must be disconnected to ensure that adequate air can return to the cylinder to prevent cylinder collapse. undo the NEFA Feed Valve lock nut and turn adjustment screw two turns anticlockwise. When servicing NEFA Relief Valves always use the original spring. allow the water to flow 1-2 minutes to ensure the mixed water temperature has stabilised.FEATURES •• •• •• •• •• •• •• Cast Dezincification Resistant (DR) brass body Adjustable from 30°C to 65°C Fail Safe: Failure of cold water supply causes valve to close and shut off hot flow Configured for easy installation Non-return fitted to stop thermosyphon Serviceable Complies with the requirements of NZBC G12 SPECIFICATIONS •• •• •• •• •• •• Conforms to NZS:4617 Connections: All 20 mm ( ¾ BSP) male Factory set outlet temp 55°C Adjustable 30°C to 65°C Minimum 20 l/min at 35 kPa (3. •• Measure temperature at nearest outlet to tempering valve. •• 8 . Anticlockwise increases the temperature. ensure the hot water source is switched on and supplying water within the specified hot water temperature limits. hospitals. •• The recommended temperature differential hot supply/mixed outlet temperature to ensure thermal shut off is 15°C. •• Before setting the valve.5 m head) Maximum hot water temp 99°C PRODUCT CODES NTLV NEFA Temperature Limiting Valve SETTING TEMPERATURE Tempering valves must be commissioned at time of installation. The delivered hot water temperature at any sanitary fixture used for personal hygiene shall not exceed: a) 45°C for early childhood centres. old people’s homes. •• The set outlet temperature is adjusted by turning the adjusting screw in the cover of the valve with a screwdriver. Clockwise decreases the temperature. and b) 55°C for all other buildings. schools. •• At a flow rate of not less than 4 litres/minute. institutions for people with psychiatric or physical disabilities. Do not braze or solder near valve.29 for detailed instructions. Make up pipe runs to the NEFA TLV with 20mm copper pipe. In the event of high temperature the NEFA TLV will shut the hot supply and not allow the vent or relief valve to relieve pressure in the cylinder. but the supply pressures at the inlets to the NEFA TLV must be equal. Ensure that hot and cold supply pressures to the inlets of the NEFA TLV are equal. The NEFA TLV must not obstruct the hot water cylinder vent or NEFA Relief Valve. Alternatively the NEFA TLV may be installed close to the outlets being serviced.TEMPERATURE LIMITING VALVE LOW PRESSURE INSTALLATION •• •• •• •• •• •• •• The NEFA TLV can be installed in any orientation but ensure that the temperature adjusting screw is accessible. Pages 24 . On header tanks and low head installations the NEFA TLV should be positioned as low as possible (at base of cylinder) to increase performance. adjusting screw valve assembly cold flow mixed flow thermostatic element hot flow Fig 3. (Note the NEFA Cold Water Expansion Valve has a 20mm port to allow a simple pipe run to TLV). When installing in a wetback system try to install as far from cylinder as possible to allow for cooling (maximum 90°C). Refer to Installation Guide. IMPORTANT •• •• •• Never install a Temperature Limiting Valve directly onto the outlet of the hot water cylinder. Where inlet supply pressures are not equal an additional non-return valve should be fitted on the hot water supply line. Ensure that the NEFA TLV is positioned a minimum of 350mm from the hot outlet of the water heater. 9 . FEATURES •• •• •• •• •• •• •• DR brass construction Compact size Superior flow rate Pressure compensated Dry spring construction Ideal for protection of taps. 500 kPa Max inlet pressure 2000kPa Flow Rates at constant inlet pressure Inlet kPa 350 kPa 500 kPa 700 kPa 100 l/min 100 l/min Connections: Inlet and Outlet 20 mm (¾ BSP) male. pipe work and appliances from high supply pressures Complies with the requirements of NZBC G12 SPECIFICATIONS •• •• •• •• •• •• •• •• Conforms to NZS:4608 Factory set outlet pressures 350 kPa. Overall length 85 mm Main body diameter 40 mm Maximum temperature 80°C PRODUCT CODES NEPLV350MM20 NEPLV500MM20 350 kPa NEFA Pressure Limiting Valve 500 kPa NEFA Pressure Limiting Valve 10 . PRESSURE LIMITING VALVE INSTALLATION •• •• •• •• •• Install the NEFA Pressure Limiting Valve at entry to household to equalise complete system and protect tapware and appliances from excessive pressure. 11 . control spring jumper color coded set pressure valve seat Fig 4. The NEFA Pressure Limiting Valve is factory set. IMPORTANT •• •• Install a NEFA 3-in-1 Filter Stopcock before the NEFA Pressure Limiting Valve. The valve should be installed where it can be easily accessed. Pages 24 . Can be installed vertical or horizontal.29 for detailed instructions. Refer to Installation Guide. The valve should not be installed in the ground or in a situation where it could be subject to freezing. It cannot be serviced and should not be dismantled. Install with flow in direction of arrow marked on body. pipework and appliances from high supply pressures 60 mesh stainless steel filter efficiently prevents damage to hot water system by filtering foreign particles Complies with the requirements of NZBC G12 SPECIFICATIONS •• •• •• •• •• •• •• Conforms to NZS:4608 Maximum inlet pressure 2000 kPa Set pressure adjustable 100 kPa to 600 kPa Flow rate of 112 l/min on 20 mm pipe work at 700 kPa supply pressure 20 mm (¾ BSP) male inlet and outlet Overall length 145 mm.FEATURES •• •• •• •• •• •• •• •• •• Cast Dezincification Resistant (DR) brass body Superior flow rate Pressure compensated Set pressure adjustable Built-in Non-return valve prevents back flow Filter can be cleaned without shutting off any other valve Protection for entire household. to achive the desired outlet pressure. turn the screwdriver anti-clockwise (-). To increase the set pressure. Using a screwdriver rotate the adjusting screw shown in Fig 5. 12 . however the set outlet pressure can be increased or decreased if required. turn the screwdriver clockwise (+). To decrease the set pressure. taps. main body diameter 53 mm Maximum temperature 65°C PRODUCT CODES NPC500 500 kPa NEFA Mains Pressure Inlet Control Valve PRESSURE ADJUSTMENT •• •• The NPC is factory set as indicated on the valve. protecting tapware and appliances from excessive pressure. Turn the isolation control clockwise to the closed position. and when inside buildings above a safe tray where water from servicing the filter will not cause damage. the recommended orientation is with the filter cap facing down to allow foreign particles to fall away when the filter is removed for cleaning. 13 .29 for detailed instructions. To reassemble. 3. This will provide a point of isolation. Unscrew the filter cap. Care should be taken not to damage the filter. Withdraw the filter and clean it. PRESSURE LIMITING & NON-RETURN INSTALLATION •• •• •• A NEFA NPC500 Mains Pressure Inlet Control Valve should be installed in the main water supply at point of entry. The NEFA Mains Pressure Inlet Control Valve can be installed in any orientation.MAINS PRESSURE INLET CONTROL VALVE 4-in-1 ISOLATION. a filtered water supply and balanced water pressure to the whole house. Refer to Installation Guide. FILTER. SERVICING •• •• •• To remove and clean the filter (Refer Fig 5. The valve should be installed where it can be easily accessed. 2. isolation hand control set pressure adjustment diaphragm filter filter cap jumper non–return Fig 5. reverse the above procedure. Pages 24 .): 1. To ensure full flow it is recommended that the filter should be inspected and cleaned at 12 month intervals or more often if required. 3) The maximum ratio permitted between supply pressures.FEATURES •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• Provides safe controlled water temperature to sanitary outlets Cast DR brass body Fail Safe: Failure of cold water supply causes valve to close and shut off hot flow Advanced polymers give greater resistance to calcium deposits Factory tested and set at 55ºC adjustable from 35ºC to 58ºC Integral Non-Return on hot and cold . depending on site conditions. If a spike occurs it may take a few seconds for the temperature to stabilise back to within ±3°C. 5) Note: Steps should be taken to eliminate any causes of rapid changes in supply pressures.14 states that water shall be stored at not less than 60°C to inhibit the growth of legionella bacteria.ideal for commercial installations Tamper proof adjustment special tool supplied Maximum Hot Inlet Temperature 90°C SPECIFICATIONS Conforms to: NZS4617:1989 Connections: 20 mm (¾ BSP) male Recommended outlet temperature range: 45°C to 55°C (2) Factory setting (must be commissioned on site): 55°C nominal Accuracy of mixed outlet temperature: ± 3°C Cold water supply: 5°C to 25°C Hot water supply: 60°C to 90°C (1) Hot water / mixed water temperature differential: 15°C minimum Supply pressure – static: 1600 kPa maximum Supply pressure – dynamic: 200 kPa minimum 500 kPa maximum Max permitted pressure variations at either inlet: ± 10% maximum (4. as this may result in an outlet temperature spike greater than ±3°C from commissioned temperature.5) (from supply pressure at commissioning) Pressure supply differential – dynamic : 3:1 maximum (3) (at time of commissioning) Minimum flow rate: 4 litres/minute 1) The Building Code Approved Document G12 clause 6. 2) The valve can be set as low as 35°C or as high as 58°C. 4) The maximum permitted pressure variation in either supply from commissioning pressures in order to maintain the outlet temperature to ±3°C. To obtain good tempering valve response the cylinder thermostat should be set at a minimum of 65°C. It is recommended at time of commissioning that hot and cold pressures be as equal as possible. under dynamic flow operation. (These temperatures are outside the optimum working range of the valve and the requirements of G12). Notes: PRODUCT CODES NMTV NEFA Mains Pressure Tempering Valve 14 . The delivered hot water temperature at any sanitary fixture used for personal hygiene shall not exceed: a) 45°C for early childhood centres. hospitals.MAINS PRESSURE TEMPERING VALVE INSTALLATION •• •• •• Do not install an NMTV directly onto a hot water cylinder. Where installing into installations with separate hot and cold supply’s install a non-return valve on hot water supply or use the NEFA high performance solar tempering valve. measure temperature at nearest outlet to tempering valve. •• Using the adjusting tool supplied. IMPORTANT Tempering valves must be commissioned at time of installation.29 for detailed instructions. •• Before setting the valve. It is recommended that a NEFA NPC500 valve (with filter/strainer) is installed upstream of the cold inlet. All NMTV installations should have line strainers fitted. and b) 55°C for all other buildings. Strainers are essential to prevent debris entering the NMTV that could prevent it working effectively. schools. old people’s homes. allow the water to flow 1-2 minutes to ensure the mixed water temperature has stabilised. It is recommended that the valve be installed as close to the hot water source as possible. (Refer Fig 10. •• Using a thermometer. •• cap set temperature adjustment hot flow cold flow valve thermal element non–return valve Fig 6. Refer to Installation Guide. institutions for people with psychiatric or physical disabilities. Pages 24 . •• At a flow rate of not less than 4 litres/minute. For optimum performance install with a 150mm thermosyphon between the cylinder outlet and hot inlet. •• The recommended temperature differential hot supply/mixed outlet temperature to ensure thermal shut off is 15°C. mixed flow 15 . ensure the hot water source is switched on and supplying water within the specified hot water temperature limits. rotate the adjusting spindle (H) hot or (C) cold as indicated on the tool until the required set temperature is achieved. Page 25). ideal for commercial installations Tamper proof adjustment special tool supplied Maximum Hot Inlet Temperature 99°C SPECIFICATIONS Conforms to: NZS4617:1989 Connections: 20 mm (¾ BSP) male Recommended outlet temperature range: 45°C to 55°C (2) Factory setting (must be commissioned on site): 55°C nominal Accuracy of mixed outlet temperature: ± 3°C Cold water supply: 5°C to 25°C Hot water supply: 60°C to 99°C (1) Hot water / mixed water temperature differential: 15°C minimum Supply pressure – static: 1600 kPa maximum Supply pressure – dynamic: 200 kPa minimum 500 kPa maximum Max permitted pressure variations at either inlet: ± 10% maximum (4. If a spike occurs it may take a few seconds for the temperature to stabilise back to within ±3°C. It is recommended at time of commissioning that hot and cold pressures be as equal as possible. depending on site conditions. Notes: PRODUCT CODES NSTV20 High Performance Solar Tempering Valve 16 . 2) The valve can be set as low as 35°C or as high as 58°C. (These temperatures are outside the optimum working range of the valve and the requirements of G12). as this may result in an outlet temperature spike greater than ±3°C from commissioned temperature. 3) The maximum ratio permitted between supply pressures.5) (from supply pressure at commissioning) Pressure supply differential – dynamic : 3:1 maximum (3) (at time of commissioning) Minimum flow rate: 4 litres/minute 1) The Building Code Approved Document G12 clause 6. 5) Note: Steps should be taken to eliminate any causes of rapid changes in supply pressures. 4) The maximum permitted pressure variation in either supply from commissioning pressures in order to maintain the outlet temperature to ±3°C.14 states that water shall be stored at not less than 60°C to inhibit the growth of legionella bacteria.FEATURES •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• •• Provides safe controlled water temperature to sanitary outlets Cast DR brass body Fail Safe: Failure of cold water supply causes valve to close and shut off hot flow Advanced polymers give greater resistance to calcium deposits Factory tested and set at 55ºC adjustable from 35ºC to 58ºC Integral Non-Returns on hot and cold . To obtain good tempering valve response the cylinder thermostat should be set at a minimum of 65°C. under dynamic flow operation. •• Temperature adjustment Filter & Non-return Cold inlet Hot inlet Valve member Thermostatic element Fig 6. The delivered hot water temperature at any sanitary fixture used for personal hygiene shall not exceed: a) 45°C for early childhood centres. For optimum performance install with a 150mm thermosyphon between the cylinder outlet and hot inlet. •• Before setting the valve. •• The recommended temperature differential hot supply/mixed outlet temperature to ensure thermal shut off is 15°C. rotate the adjusting spindle (H) hot or (C) cold as indicated on the tool until the required set temperature is achieved. hospitals. Refer to Installation Guide. It is recommended that the valve be installed as close to the hot water source as possible. institutions for people with psychiatric or physical disabilities. •• Using a thermometer. (Refer Fig 10. schools. Strainers are essential to prevent debris entering the NMTV that could prevent it working effectively. If installed at an outlet fixture. allow the water to flow 1-2 minutes to ensure the mixed water temperature has stabilised. and b) 55°C for all other buildings. Page 25). IMPORTANT Tempering valves must be commissioned at time of installation. old people’s homes. It is recommended that a NEFA NPC500 valve (with filter/strainer) is installed upstream of the cold inlet. Mixed outlet 17 .29 for detailed instructions. All NMTV installations should have line strainers fitted. •• Using the adjusting tool supplied. •• At a flow rate of not less than 4 litres/minute.HIGH PERFORMANCE SOLAR TEMPERING VALVE INSTALLATION •• •• •• Do not install an NMTV directly onto a hot water cylinder. 1m of pipe must be installed between the NMTV and the outlet. measure temperature at nearest outlet to tempering valve. Pages 24 . ensure the hot water source is switched on and supplying water within the specified hot water temperature limits. 6 m head and 850 kPa systems Valve seat stainless steel PRODUCT CODES NECWE76 NECWE700 76 kPa NEFA Cold Water Expansion Valve 700 kPa NEFA Cold Water Expansion Valve 18 . Outlet and TLV Outlet 20 mm (¾ BSP) male Drain 15 mm (½ BSP) male Factory set for 7.FEATURES •• •• •• •• •• •• •• •• •• •• Forged Dezincification Resistant (DR) brass body Stainless steel valve seat standard Incorporates an outlet port for running direct equal pressure cold supply to TLV Design of valve allows perfect washer contact maintaining excellent seating at low relief pressure settings Diaphragm sealed spring chamber eliminates O-ring drag associated with normal piston type sealing Integral non-return valve supplied to conform to NZBC G12 Serviceable Easy to operate flushing mechanism Valve can be used as cylinder drain Complies with the requirements of NZBC G12 SPECIFICATIONS •• •• •• •• Conforms to NZS:4608 Connections: Inlet. Observe flow direction on body. It should not exceed 9m in length and include not more than three 90° bends.COLD WATER EXPANSION VALVE INSTALLATION •• •• The drain line must not rise above the NEFA CWE Valve. or other vented water will not cause a hazard or a nuisance. IMPORTANT •• •• •• The NEFA CWE Valve is factory set to relieve at a pressure slightly less than the NEFA Pressure Relief Valve and is not field adjustable.29 for detailed instructions. 19 . Refer to Installation Guide. For low pressure systems the NEFA Pressure Reducing Feed Valve setting must be reduced 1½ turns to avoid water wastage. For mains pressure systems a NEFA Pressure Limiting Valve must be fitted if the cold supply pressure is greater than 500 kPa. manual flush control diaphragm sealed dry spring chamber drain connection stainless steel valve seat integral non–return tempering valve connection (not shown) Fig 7. to a point where the outlet cannot be obstructed or blocked and where expansion. It should run at a down grade out to atmosphere. Pages 24 . FEATURES •• •• •• •• •• Forged Dezincification Resistant (DR) brass body Prevents damage to water system by filtering foreign particles Filter can be cleaned without shutting off any other valve 60 mesh stainless steel filter ensures efficient capture of foreign particles Built-in non-return valve prevents back-flow SPECIFICATIONS •• •• •• •• •• Connections: Inlet 15 mm (½ BSP) male Outlet 15 mm (½ BSP) female Length 75 mm Height 110 mm 60 mesh stainless steel filter Maximum inlet pressure 2000 kPa PRODUCT CODES N311 NEFA 15mm 3-in-1 Filter Stopcock & Non-return Valve 20 . 4. IMPORTANT •• To ensure full flow through the valve it is recommended that the filter should be removed and cleaned every 12 months. 3. The valve should not be installed in the ground or in situation where it could be subject to freezing. Unscrew filter cover anticlockwise and remove by sliding off spindle. • SERVICING To remove and clean filter (Refer Fig 8. Turn handle in clockwise direction and firmly shut off inlet water to valve. The NEFA 15mm 3-in-1 valve should be fitted with hand wheel down to allow foreign particles to fall away when the filter is removed. Remove handle retaining screw and remove hand wheel from spindle. non–return flap filter cover spindle handle Fig 8. 5. Install the valve with flow in the direction as marked on the valve. 2.): 1. Remove filter and clean. 21 . Reassemble in the reverse order.15mm 3-in-1 FILTER STOPCOCK & NON-RETURN VALVE INSTALLATION •• •• •• •• •• Install at inlet to household system to protect the complete household. depending on the water supply. The valve should be installed where it can be easily accessed. FEATURES • • • • • • Forged Dezincification Resistant (DR) brass body Prevents damage to water system by filtering foreign particles Filter can be cleaned without shutting off any other valve 60 mesh stainless steel filter ensures efficient capture of foreign particles Built in non-return valve prevents back-flow Design allows high flow rate through valve SPECIFICATIONS • • • • • • Connections: Inlet 20 mm (¾ BSP) male Outlet 20 mm (¾ BSP) female Length 90 mm Height 100 mm 60 mesh stainless steel filter Maximum inlet pressure 2000 kPa Flow rate at 700 kPa inlet pressure: 125 l/min PRODUCT CODES NE31120 NEFA 20mm 3in1 Filter Stopcock & Non-return Valve 22 . Reassemble in the reverse order taking care not to damage filter. Install the valve with flow in the direction as marked on the valve. 4. SERVICING • To remove and clean filter (Refer Fig 9. Unscrew filter cap anticlockwise and remove from valve body.20mm 3-in-1 FILTER STOPCOCK & NON-RETURN VALVE INSTALLATION • • • • • • Install at inlet to household system to protect the complete household. 2. 3. The NEFA 20mm 3-in-1 valve should be fitted with the filter cap down to allow foreign particles to fall away when the filter is removed for cleaning. IMPORTANT To ensure full flow through the valve it is recommended that the filter should be removed and cleaned every 12 months. The valve should not be installed in the ground or in situation where it could be subject to freezing. Note the filter cover only needs to be hand tight as it is o-ring sealed. depending on the water supply.): 1. Turn handle clockwise to shut off inlet water to valve. handle non–return valve filter cap Fig 9. 23 . Withdraw filter element and clean. The valve should be installed where it can be easily accessed. except as directed in instruction sheets. Never expose valves to a naked flame or heat. Measure delivered hot water temperature with thermometer at sanitary outlets. temperature pressure relief or cold water expansion valves. If you have any questions please contact Methven Limited Customer Service free phone 0800 804 222 ALWAYS •• •• •• •• •• •• •• Always connect NEFA valves to water heaters with non-ferrous fittings and copper pipe. Never fit a stop valve or any obstruction in a pressure relief or cold water expansion drain line. Always use copper pipe for drain lines from relief valves and cold water expansion valves. Never attempt to adjust the setting of pressure relief. NEVER •• •• •• •• •• •• •• Never install a tempering valve directly onto the outlet of the hot water cylinder. Always check for the correct flow direction through valves as indicated by markings on the valve and fitting instructions. Never attempt to adjust valves or tamper with seals. 24 . excess tape may be cut free when making connections and affect the function of the valve. Never fit a stop valve or any obstruction in the piping between the connection from the hot water cylinder and the inlet of a Pressure Relief Valve. Always flush pipes before connecting valves.INSTALLATION CHECKLIST THIS BOOKLET IS ISSUED AS A GENERAL GUIDE ONLY Refer to the water heater manufacturer’s installation instructions for specific requirements. Heat will destroy the seals and the sealing parts of the valve. Always check water supply pressure with a pressure gauge. Installation of valves should always be carried out by a qualified plumber and must comply with the requirements of the New Zealand Building Code and local Territorial Authority. Never allow thread sealing tape to extend over the end of threads. Refer to the New Zealand Building Code Compliance Document G12 Water Supplies available from the Department of Building and Housing. Always ensure that there is access to the hot water cylinder and valving in case future adjustment or replacement is required. These are safety devices and must be in excellent working order. The NEFA Cold Water Expansion Valve has an outlet port to allow a simple connection to the tempering valve. 25 . For optimum performance the cold water supply to the NEFA tempering valve must be at the same pressure as the hot water supply from the cylinder to the tempering valve. •• •• •• •• •• Always install a NEFA NPC500 Mains Pressure Inlet Control Valve in the main water supply at point of entry. This will provide a point of isolation.INSTALLATION GUIDELINES MAINS PRESSURE MAINS PRESSURE INSTALLATION HOT WATER TO LAUNDRY & KITCHEN TEMPERED WATER TO BATHROOM AND SHOWER BALANCED PRESSURE COLD WATER TO HOUSEHOLD COLD WATER MAINS INLET BALL VALVE NEFA NPC500 MAINS PRESSURE INLET CONTROL WITH INTEGRAL ISOLATION & FILTER 150mm Recommended NEFA NMTV MAINS PRESSURE TEMPERING VALVE TPR VALVE MAINS PRESSURE STORAGE WATER HEATER DRAIN NEFA NECWE700 COLD WATER EXPANSION VALVE WITH NON-RETURN DRAIN Fig 10. Where separate hot and cold water supplies are delivered to the NEFA tempering valve ensure the pressures are balanced and a nonreturn valve is fitted to the hot water supply. In order to ensure that the NEFA tempering valve works efficiently set the hot water cylinder thermostat to between 65°C to 70°C. a filtered water supply and balanced water pressure to the whole house. Use 20mm copper pipe to make up hot and cold supply connections to the tempering valve. NEFA Cold Water Expansion Valve drain lines should not exceed 3m in length and include not more than three 90º bends. REMEMBER •• •• Faulty valves must be immediately repaired or replaced. With average domestic hot water usage 2 to 4 litres of water from thermal expansion can be expected. 26 . In low pressure installations with a NEFA Cold Water Expansion Valve the NEFA Pressure Reducing Feed Valve adjusting screw must be turned 1½ turns anticlockwise to avoid water wastage.6 m or 12. •• •• •• •• •• PRESSURE REDUCING FEED VALVE NEFA Pressure Reducing Feed Valves come factory set at 3.7 m.2 m as indicated on the valve. The valve will operate in any position but for ease of service the valve should be installed with the cap up. allowance is made for the NEFA Relief Valve to be fitted 1 m above the NEFA Feed Valve. CYLINDER DRAIN •• Always install a NEFA 3-in-1 Filter Stopcock in the main water supply at point of entry. If they are installed level as in under sink heaters undo lock nut and turn adjustment screw 1½ turns anticlockwise. 7. This will protect the whole house and make isolation easy for servicing. When installed on a side entry cylinder a thermosyphon loop of 150mm at the entry to the cylinder will help prolong the life of the NEFA Pressure Reducing Feed Valve.LOW PRESSURE — VALVE VENTED LOW PRESSURE — VALVE VENTED INSTALLATION HOT WATER TO LAUNDRY & KITCHEN TEMPERED WATER TO BATHROOM AND SHOWER NEFA NTLV TEMPERING VALVE WATER HEATER TO NZS 4602 WITH THERMOSTAT & ALT SIDE THERMAL ENTRY ENERGY CUT OUT BALL VALVE 80mm MIN NEFA NRV76 PRESSURE & VACUUM RELIEF VALVE DRAIN NEFA N311 3in1 FILTER STOPCOCK & NON-RETURN COLD WATER MAINS INLET NEFA NFV7615 PRESSURE REDUCING FEED VALVE NEFA NECWE76 COLD WATER EXPANSION VALVE WITH NON-RETURN DRAIN Fig 11. When set at the factory. This eliminates any thermal expansion in the water heater. When water has stopped the pressure from the outlet of the NEFA Feed Valve is now balanced at the pressure of the relief or vent. Release the lock nut on the adjusting screw of the NEFA Feed Valve and wind the adjusting screw clockwise to increase the outlet pressure until water is observed at the vent. Remove cap by unscrewing from valve body. cap jumper valve jumper washer bridge fork adjusting screw lock nut ccw Fig 12. Run a hot tap for 5-10 seconds. Inspect jumper valve and valve seat on jet for damage. Remove bridge by sliding out of fork. Replace defective parts and reassemble. For open vented systems observe the vent pipe.INSTALLATION GUIDELINES •• •• •• •• •• •• •• •• SETTING THE OUTLET PRESSURE OF NEFA FEED VALVE Switch off the power to the Hot Water Cylinder. Wind the adjusting screw of the NEFA Feed Valve a further ½ to ¾ turn anticlockwise. For systems with a NEFA Relief Valve observe the outlet from the drain. Jet is sealed by o-ring and can be unscrewed from body. For the system to be efficient and to avoid wastage there must be a differential between the venting pressure and the NEFA Feed Valve’s set outlet pressure. For systems with a NEFA Cold Water Expansion Valve observe the drain from the Cold Water Expansion Valve. Slowly reduce the outlet pressure from the pressure reducing valve by turning adjusting screw anticlockwise until water from vent stops. Restore water pressure and reset outlet pressure of feed valve. •• SERVICING THE JUMPER WASHER OF NEFA FEED VALVE •• •• •• •• •• •• •• •• Isolate water supply to valve at inlet and outlet. Lift off jumper valve and remove jumper washer. + cw 27 . NZBC G12 Clause 7. 3. 28 . 3.5m head and for best performance install the NEFA tempering valve as close to the base of the cylinder as possible using 20mm copper pipe. The standing water level shall be a minimum of 300mm below insulation. TEMPERED WATER TO BATHROOM AND SHOWER NEFA NTLV TEMPERING VALVE NEFA N311 3in1 FILTER STOPCOCK & NON-RETURN HIGH PRESSURE COLD WATER TO HOUSEHOLD BALANCED PRESSURE COLD WATER TO SHOWER CYLINDER DRAIN Fig 14. NOT TO EXCEED WORKING PRESSSURE STATED ON CYLINDER. The use of an expansion control valve can help protect the water heater.7 METRES MIN.6 METRES MAX. NOT TO EXCEED WORKING PRESSSURE STATED ON CYLINDER.2. •• With low pressure header tank installations the NEFA tempering valve requires a minimum of 2. WATER HEATER TO NZS 4602 WITH THERMOSTAT & THERMAL ENERGY CUT OUT NEFA N311 3in1 FILTER STOPCOCK & NON-RETURN COLD WATER MAINS INLET NEFA NFV7615 PRESSURE REDUCING FEED VALVE ALT SIDE ENTRY BALL VALVE Fig 13.5 METRES MIN HEAD REQUIRED AT TEMPERING VALVE COLD WATER MAINS INLET HOT WATER TO LAUNDRY & KITCHEN WATER HEATER TO NZS 4602 WITH THERMOSTAT & ALT SIDE THERMAL ENTRY ENERGY CUT OUT BALL VALVE 7.LOW PRESSURE — OPEN VENTED LOW PRESSURE — OPEN VENTED INSTALLATION VENT PIPE HOT WATER TO LAUNDRY & KITCHEN TEMPERED WATER TO BATHROOM AND SHOWER NEFA NTLV TEMPERING VALVE ROOF LINE 7.6 METRES MAX. CYLINDER DRAIN •• •• In areas subject to freezing vent pipes shall be insulated.7 METRES MIN. LOW PRESSURE — HEADER TANK INSTALLATION VENT PIPE ROOF LINE 2. existing installation with an HEIGHT FROM CYLINDER BASE open vent to the roof. This installation is not suitable for areas subject to freezing. To increase the pressure of an 3. refer NZS 4602 WITH Fig 12 Page 27.INSTALLATION GUIDELINES •• •• •• •• •• •• •• •• •• •• •• •• PRESSURE RELIEF VALVES ALTERNATIVE RELIEF VALVE NEFA Pressure Relief Valves INSTALLATION are factory set to 3. Drain lines from the NEFA Cold Water Expansion Valve and the NEFA Relief Valve must fall continuously from the outlet of the valves. Alternatively install the NEFA Relief Valve after a thermosyphon loop of a minimum of 80 mm as shown in Fig 15.7 m 7. To protect the NEFA Relief Valve from excessive heat we recommend that the relief valve is fitted 80 mm below the top of the cylinder as shown in Fig 11. The NEFA Relief Valve should not be fitted more than 300mm above the cylinder. Drain lines should not exceed 3m in length and include not more than three 90° bends.7 m Relief Valve can be fitted PRESSURE & VACUUM VENT + RELIEF VALVE LINE RELIEF VALVE ROOF to the vent not more than NOT TO EXCEED WORKING PRESSSURE 3.7 m above the bottom of the STATED ON CYLINDER cylinder as shown in FIG 16. If there is a possibility of the drain freezing. an air break in the drain at the water heater is required. 29 . NEFA Relief Valve points down. Drain lines should run to a point where the outlet cannot be obstructed or blocked and where expansion and other vented water is discharged to atmosphere and will not cause a hazard or a nuisance. Except as detailed under existing installations below. Relief valves must only be NEFA NRV76 PRESSURE & VACUUM installed on a thermostatically WATER HEATER RELIEF VALVE TO controlled hot water cylinder NZS 4602 INSTALL WITH INTEGRAL WITH with a maximum heating VACUUM BREAK VENT HOLE UP THERMOSTAT capacity of 8 kW. THERMOSTAT & The vent pipe must be bent as THERMAL ENERGY shown so that the outlet of the CUT OUT Fig 16.2 m head as indicated 80 mm MIN on the valve and cannot be DRAIN adjusted. & THERMAL Relief Valves must not be ENERGY CUT OUT fitted to a water heater with Fig 15. a NEFA NEFA NRV37 TOTAL HEAD 3. a wetback or where solar heating is used. WATER HEATER The pressure reducing valve TO should then be adjusted.6 m or 12.7 METRES MAX. With average domestic hot water usage 2 to 4 litres of EXISTING INSTALLATION water from thermal expansion can be expected. Turn water on. washer and diaphragm for damage. YES Unblock CWE drainline Has Relief Valve stopped dripping? YES NO CHECK RELIEF VALVE High Pressure Does the Temperature Pressure Relief Valve (TPR) drip or ‘gush’ intermittently Low Pressure Turn off water supply to hot water cylinder. Average domestic hot water useage can expect 2-4 liters of expansion water per day. YES Install CWE with correct pressure NO Check correct pressure CWE is fitted Has dripping stopped? NO YES NO Check CWE drain line is not blocked YES Drip is normal thermal expansion. Check seat. CWE and Relief Valves are OK.FAULT FINDING FOR HOT WATER INSTALLATIONS If the Relief valve drain drips. Drip Replace TPR Nefa Feed. 30 . Replace if necessary. Check thermostat is not set to high. Note: Due to factory settings. If the Cold Water Expansion Valve (CWE) drain or vent pipe drips. Gush Check Thermostat. Is a Cold Water Expansion Valve (CWE) fitted? NO Check for thermal expansion. Run hot tap for 5-10 seconds. Turn water heater energy supply on. TPR is relieving high temperature water. Dismantle the Relief Valve and clean. springs cannot be exchanged. Turn water heater energy supply off. Refit Relief Valve. NO Install correct PLV YES Replace PLV YES Has dripping stopped? NO Check CWE Turn off water supply to the hot water cylinder. Replace if necessary.TROUBLESHOOTING GUIDE Check for cross feeding. (Low pressure systems only. Turn water back on. Check jet. Check seat. single lever mixer etc. Low Pressure Is a Pressure Limiting Valve (PLV) fitted? YES Check and rectify any cross feeding (inadvertent high pressure connection to low pressure) through a mixing unit e. seat and washer for damage. Dismantle the CWE and clean. Turn water on. Note: Cold feed to TLV must come off cold cylinder feed pipe AFTER the feed valve or PLV. Turn off water supply to the hot water cylinder only. YES Has dripping stopped? NO Check Feed Valve setting matches CWE / vent pipe height. Note: CWE is factory set and cannot be adjusted. shower mixer.) Refer setting instructions.g. 31 . Turn water back on. washer and diaphragm for damage. Replace with CWE kit if necessary. Has dripping stopped? NO CHECK SUPPLY PRESSURE High Pressure Remove the Feed Valve cap. Isolation & Filter) Mains Pressure Tempering Valve NECWE700 Cold Water Expansion Valve (with Intergral Non-Return) BV78820 20 mm M&F Ball Valve LOW PRESSURE NVKLP LOW PRESSURE INSTALLATION PACK 7. Stop cock & Non-return 20 mm M&F Ball Valve 32 .MAINS PRESSURE NEMPK MAINS PRESSURE INSTALLATION PACK 500 kPa NPC500 NMTV 20 mm Mains Pressure Inlet Control Valve (Pressure Limiting.6m) (With Integral Vacuum Break) NECWE76 Cold Water Expansion Valve (7.6 m) Pressure Relief Valve (7.6 m) (with Intergral Non-Return) NTLV N311 BV78820 Temperature Limiting Valve Filter.6 m Head NFV7615 NRV76 Pressure Reducing Feed Valve (7. 2 m) Pressure Relief Valve (12.2m Head NFV12215 NRV122 Pressure Reducing Feed Valve (12.VALVE PACKS MAINS PRESSURE NMPKSOL MAINS PRESSURE SOLAR INSTALLATION PACK 500 kPa NPC500 NSTV20 20 mm Mains Pressure Inlet Control Valve (Pressure Limiting. Stop cock & Non-return 20 mm M&F Ball Valve 33 . Isolation & Filter) High Performance Solar Tempering Valve NECWE700 Cold Water Expansion Valve (with Intergral Non-Return) BV78820 20 mm M&F Ball Valve MEDIUM PRESSURE NVK122 MEDIUM PRESSURE INSTALLATION PACK 12.2m) (With Integral Vacuum Break) NECWE120 Cold Water Expansion Valve (12 m) (with Intergral Non-Return) NTLV N311 BV78820 Temperature Limiting Valve Filter. 2m 270031 Nefa Feed Valve Adjusting Screw and Nut 920495 Nefa Feed Valve Backing Plate 920673 Nefa Feed Valve Spring Cap PRESSURE AND VACUUM RELIEF VALVE SPNRVSK Nefa Relief Valve Service Kit NRVD Nefa Relief Valve Diaphragm Assembly NRVF Nefa Relief Valve Flap 15mm 3-in-1 FILTER STOPCOCK SP193113 Nefa Filter 311 15mm SP311FLAP Non-return Flap N311 15mm 786101 311 15mm Spindle O-ring SP31120SK Nefa Kit 20mm 3-in-1 NTLV TEMPERATURE LIMITING VALVE 782004 Nefa TLV Service Kit NPC500 MAINS PRESSURE INLET CONTROL VALVE 920700 Filter and O-ring Service Kit NON-RETURN NECWENRV Nefa CWE Non-return Valve and Holder 34 .6m 920665 Nefa Feed Valve Spring 12.NEFA SPARE PARTS & SERVICE KITS PRESSURE REDUCING FEED VALVE SPNFVSK Nefa Feed Valve Service Kit NFVW Nefa Feed Valve Silicon Washer (pack 20) 920606 Nefa Feed Valve Jumper Assembly NFVD Nefa Feed Valve Diaphragm 920533 Nefa Feed Valve Diaphragm Assembly with Screw and Nut 920541 Nefa Feed Valve Fork 920568 Nefa Feed Valve Fork Bridge NFVCJ Nefa Feed Valve Replacement Jet Kit 920607 Nefa Feed Valve Plastic Cap and O-ring 920509 Nefa Feed Valve Cap O-ring (pack 5) 920657 Nefa Feed Valve Spring 3.7m and 7. SPARE PARTS & SERVICE KITS . methven. Methven Limited 447 Rosebank Road. Facsimile +64 9 829 0439. Methven reserves the right to alter specifications or product from that shown.com Freecall: 0800 804 222 Freefax: 0800 805 222 Please note: While every effort is made to ensure that the details in this brochure were correct at the time of printing. please visit www. Private Bag 19996. Telephone +64 9 829 0429. Auckland 1026. elemental chlorine free.net 280101 Issue D May 2011 .com. Avondale. Printed with soy-based printing inks.www. For detailed technical and warranty information. Email info@methven. New Zealand.methven. This brochure is printed on an environmentally responsible paper.