TAHI THERMOSTATIC MIXER VALVE (1 and 2 outlets) INSTALLATION INSTRUCTIONS Issue A 435036 Methven warrants this product against manufacturing defects and that it is suitable for use under the operating conditions specified in this instruction sheet. For your warranty please refer to www.methven.com or call Customer Service TESTING AND MAINTENANCE ● The valve must be tested to ensure correct operation at commissioning and thereafter at intervals no greater than 12 months ● For details on maintenance procedures and spare parts please refer to 435035 Tahi Thermostatic Maintenance Guide New Zealand 0800 804 222 Australia 1300 638 483 UK 0800 195 1602 TECHNICAL SPECIFICATIONS Operating Pressure Suitable for mains pressure. Min 150kPa, Max 500kPa (Dynamic). Operating Temperature Maximum mixed temperature 47˚C Inlet Connections Female ¾” BSP / ¾” NPT All pipework must be thoroughly flushed prior to installation of the system OPERATING CONDITIONS OF USE Before installation the operating conditions of use must be checked. Table 1 contains details of the necessary conditions of operation. Operating pressures above 500kPa will require the installation of a pressure reducing valve. Single Dual Maximum Static Pressure 1000kPa 1000kPa Flow pressure (Hot & Cold) 150- 500kPa 150- 500kPa Hot Supply Temperature 55 - 85 °C 55 - 85 °C Optimum Hot Supply Temperature 60 - 65 °C 60 - 65 °C Cold Water Supply Tem- perature 5 – 25 °C 5 – 25 °C Maximum Allowable Outlet Temperature 46 °C 46 °C Max Dynamic Pressure Ratio (Hot to Cold OR Cold to Hot) 3.5 : 1 3.5 : 1 Minimum Temperature Differential Between Either Supply and Outlet Temperature 12 °C 12 °C Installation Type Concealed Concealed Number of Outlets 1 2 Service Valves Integral Integral End Connector Specs FEMALE: ¾” BSP / ¾” NPT FEMALE: ¾” BSP / ¾” NPT Overal Dimensions (W x H x D) 164mm x 191mm x 145mm 221mm x 191mm x 145mm Table 1. Operating Conditions of use * If a water supply is fed by gravity then the supply pressure should be verified to ensure the conditions of use are appropriate for the valve. NORMAL OPERATING CONDITIONS ● Inlet Dynamic Pressures nominally balanced to within 10% of each other. ● A temperature differential of approximately 50˚C between the hot and cold inlet temperatures. ● A temperature differential of 15-30˚C between the mixed blend setting and either supply. NOTES ● The Tahi thermostatic mixer valve is precision engineered and will give continuous safe and controlled performance providing it is installed, commissioned and maintained according to the instructions contained in this document. ● The fitting of strainers is recommended as close as is practicable to the water supply inlets of the thermostatic mixing valve. (Recommended maximum mesh aperture of 0.02”). ● For reasons of general safety hot water storage temperature should generally be maintained between 60˚C - 65˚C. ● The factory nominal preset temperature is achieved with inlet conditions of 300 kPa balanced dynamic pressure, cold inlet temp at 15˚C and hot inlet temp at 70˚C. Preset temperature may vary if site conditions differ from these values. FLOW RATES 0 10 20 30 40 50 Flow Rate (L/min) 150 200 250 300 350 400 450 500 Dynamic Pressure (Inlet) kPa 150 200 250 300 350 400 450 500 23.9 27.3 30.6 33.7 36.7 39.5 42.2 44.8 MAX Flow Rate (L/Min) 29.1 32.8 36.4 39.7 42.9 45.9 48.8 51.5 Dynamic Supply Pressure (kPa) Single Dual Single Outlet Dual Outlet Symptom 1 Only hot or cold water from outlets Symptom 3 Mixed outlet temperature drift. Symptom 4 Cross feed of hot water into supply or vice versa. Symptom 5 Maximum mixed outlet temp too high or low. Check inlet supplies are not reversed. Check that hot water is reaching the mixer. Check that service valves are both open. Check if the hot or cold supply has failed. Check that operating conditions have not changed. Refer symptom 2. Refer symptom 3&4. Check strainers around cartridge for blockage Check that dynamic pressures are nominally balanced. Check cartridge performance. Replace if necessary FAULT FINDING FLOWCHART Check non-return valve function Check strainers around cartridge for blockage Check that service valves are both open (see B) 45 45 106 (±10mm) 106 (±10mm) 84 (±10mm) 84 (±10mm) Check limit settings (Refer to commissioning) Check non-return valve function. NOTE: 1) VALVE TRAVEL ±40°. DO NOT OVERSTRESS 2) VALVE OPEN DIRECTIONS DIFFER ON HOT AND COLD 7 operate. Check installation depth is within manufacturers stated limits (refer step 1) Dual Flow Unit Single Flow Unit All measurements in mm. All measurements in mm. 163 91 40 Hole centres at 173.2 91 57.4 40 221 Hole centres at 173.2 B. Sevice Valve Operation OPEN OPEN CLOSE A. CLOSE Single Flow Unit Dual Flow Unit Rough in assembly Rough in Box Trim Kit Box Rough in Box Trim Kit Box Rough in assembly Lever covers Faceplate Escutcheon assembly Depth Adjustor Dial knob Dial Cap assembly 2 Short Screws 2 Long Screws Dial Guide Wooden stick Lever covers Faceplate Escutcheon assembly Depth Adjustor Dial knob Dial Cap assembly 2 Short Screws 2 Long Screws Dial Guide Wooden stick