Installation, commissioning and servicing instructions
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1 Pressure reducing s Installation, commissioning and servicing instructions Function Pressure reducing s are installed in residential water systems to reduce and stabilise inlet pressure from the water mains supply which is generally too high and variable for domestic appliances to function properly. These s can also be used to control inlet pressure to domestic hot water storage. The Tomson PRV series have been specifically designed and manufactured to meet the requirements of AS37.:00 Valves primarily for use in warm and hot water systems - P. : Control s. Product range AS 37. C of C 0467 Straight Pressure reducing DN (/ ), DN 0 (3/4 ) and DN ( ) Female connections (ISO 7/) Right-angle Pressure reducing DN 0 (3/4 ) Female connections (ISO 7/) Technical specifications Materials: Body: - Straight: dezincification resistant alloy CR EN 6 CW60N, chrome plated - Right-angle: dezincification resistant alloy CR EN 6 CW60N Cover: PA6G30 Control spindle: stainless steel Cartridge: PPS-PSU Components: brass EN 6 CW67N Diaphragm: EPDM Seals: EPDM Strainer: stainless steel Performance: Pressure setting range: kpa (Straight); 00 kpa (Right-angle) Factory setting: 30 and 00 kpa Max. inlet pressure: 000 kpa Max. working temperature: 80 C Medium: water Complies with: AS 37.
2 AS 37. WMKA Series Pressure range: kpa Max inlet pressure 600 kpa Flow rate: 00 kpa 600 kpa Max temperature: 60 C Dimensions B C D AS 37. WMKA Series Pressure range: kpa Max inlet pressure 600 kpa Flow rate: 00 kpa 600 kpa Max temperature: 60 C A A E Prod. code Ref. code Set (kpa) DN A B C D E Mass (kg) H TMS H TMS H TMS H TMS / 74, Ø ,4 0 3/4 74, Ø 46 84, 0, H TMS H TMS 00 74, 3 Ø ,4 B D C Pressure drop diagram Under following conditions: - Inlet pressure: 800 kpa - Outlet set pressure: 00 kpa p (kpa) / 3/4 p (m w.g.) , 0, 0 Flow rate (AS 37.): 0 DN DN 0 DN 0 l/min 30 l/min 0 00 kpa 60 l/min 0 l/min kpa 70 l/min 0 l/min kpa 7 l/min l/min kpa 0 A Flow rate (l/min) (m 3/h) p (kpa) /4 p (m w.g.) E 0, 0, Flow rate (l/min) (m 3/h) Prod. code Ref. code Set (kpa) DN A B H TMS /4 67 C D E Mass (kg) 46 Ø ,49 Flow rate (AS 37.): DN kpa Installation The pressure reducing must be installed by a licensed plumber and in accordance with AS/NZS 300, relevant local requirements and following these instructions. Installation diagram Check Pressure reducing Line strainer (where fitted) Isolating MAINS SUPPLY
3 Pressure reducing Line strainer (where fitted) Isolating MAINS SUPPLY Check System without recirculation STORAGE HOT WATER HEATER Tempering COLD WATER INLET. Flush the system.. Install the pressure reducing in any position either vertically or horizontally, not upside down, paying attention to the direction of flow indicator on the body of the. 3. Tomson PRV series pressure reducing s are factory set at 30 kpa or 00 kpa. 4. If required, reset the pressure by turning the screw on the top of the plastic cover. Turn it clockwise to increase the pressure and anticlockwise to decrease it. Note: Right-angle has fixed setting, not adjustable. 3
4 Recommendation for installation conditions Cavitation diagram Upstream pressure (kpa) Cavitation high risk Normal working conditions Out of working conditions Downstream set pressure (kpa) To minimize the risk of cavitation within the that may result in malfunctioning with erosion of sealing area, vibrations and noise, it is highly recommended to refer to the working conditions represented in the above diagram. Due to the numerous factors and variable conditions experienced such as system pressure, water temperature, air presence, flow rate and velocity, which may affect the behavior of the pressure reducing, it is advisable that the pressure ratio between the upstream pressure and the downstream set pressure is kept ideally to a value : and no greater than a value of 3:. (For example, upstream 000 kpa, set pressure 00 kpa, the pressure ratio = 000/00 = :). In these conditions, the possible risk of cavitation and malfunctioning is minimised, however this does not exclude the possible effects of the many other variables within the system under operating conditions. If the pressure ratio exceeds the indicated limit, the system design pressure or use of st stage pressure reducing s shall be reviewed. (For example, st stage reducing pressure from 600 to 800 kpa and then nd stage from 800 to 400 kpa). Pipework upstream and downstream of the pressure reducing shall be supported in accordance with the manufacturer s instructions, AS/NZS 300 along with any other local authority requirements, to avoid the creation and transfer of vibration and/or noise into the installation. The inlet strainer of the pressure reducing shall be periodically checked and cleaned, to minimize any partial or complete blockage which may limit the flow rate from the and/or create noise. 4
5 System flushing, cleaning and disinfection of the pipework to which the is installed shall be performed by suitably qualified persons in accordance with the system component manufacturer s instructions, AS/NZS 300 along with any other applicable local authority requirements. Exceeding the maximum stated chemical concentrations and/or duration of exposure may negatively impact on the performance of the system and/or components installed such as the pressure reducing. Chemical dosed products must be chemically compatible with materials used for the construction of the pressure reducing, specified in its technical documentation. Installation below ground If installing the Tomson PRV series underground, please ensure that steps are taken to protect the from becoming frozen in frost-prone areas or at risk of being submerged by raising water. Please allow yourself sufficient space to remove the cartridge should maintenance be required. The reading of a gauge for setting purposes may be difficult and an alternate means of checking downstream pressure may be necessary. Water hammering This is one of the main problems which may affect pressure reducing s. It is best to fit special devices to absorb water hammering when fitting pressure reducing s in systems at risk. WARNING: If it is critical to maintain the downstream pressure setting to protect equipment, as a safety measure, we recommend that a pressure, or safety, relief is installed downstream of the pressure reducing. Trouble-shooting. Increased downstream pressure near a water heater This problem is due to the water being heated by the water heater. There is no relief of the pressure because the reducing is correctly closed. The solution is to install an expansion vessel (between the heater and the reducer) to absorb the pressure increase.. The pressure reducing does not maintain its set pressure In most cases this is the result of impurities that deposit on the seat causing leakage with a resulting increase in pressure downstream. The solution is to fit a filter upstream from the reducer and subsequently to maintain and clean the cartridge (see Maintenance). Maintenance The pressure reducing is a device that controls the hydraulic circuit and its functioning needs to be checked at least every months. Proceed as follows for periodic cleaning of the strainer and inspection of the cartridge:
6 Turn off upstream water supply to the pressure reducing and open an outlet downstream to relief pressure Unscrew (anticlockwise) the setting screw to decompress the spring inside. 3 Unscrew the cover. 4 Extract the cartridge with the aid of pincers to grip the head of the screw. After inspection and cleaning, refit the cartridge or, alternatively, fit a replacement cartridge (cover tightening torque: 0 N m). 6 Reset the (see Installation). 3 4 Safety If the pressure reducing is not installed, commissioned and maintained properly in accordance with the instructions contained in this manual, it may not operate correctly, and may cause damage to objects and/or persons. Make sure that all the connections are water-tight. When installing the pressure reducing, make sure not to over-tighten the connections to the as, over time, a failure can occur with subsequent water leakage causing damage. Water temperatures higher than 0 C may cause severe burns. When installing, commissioning and maintaining the device, take the necessary precautions so that these temperatures will not endanger people. In the case of highly aggressive water, arrangements must be made to treat the water before it enters the pressure reducing, in accordance with current legislation. Otherwise, the pressure reducing may be damaged and not function correctly. Leave this operating manual with the user DISTRIBUTOR FOR AUSTRALIA: Reece Australia Ltd 8 Burwood Highway Burwood Victoria 3 Australia Tel Fax
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