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Andrews
Water Heaters
Flexistor.
400ltr, 500ltr, 800ltr, 1000ltr, 1250ltr, 1450ltr, 2000ltr, 2500ltr
Installation Manual
INSTALLATION AND SERVICE MANUAL
Unvented Flexistor Water Heaters
Installation & Servicing Instructions
Important
Please read & understand all these instructions before commencing installation.
This cylinder range does not incorporate an internal heat exchanger.
Please leave this manual with the customer for future reference.
Andrews. Built to perform.
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Table of Contents
Related Manuals for andrews Flexistor 400
Summary of Contents for andrews Flexistor 400
- Page 1 Unvented Flexistor Water Heaters Installation & Servicing Instructions Important Please read & understand all these instructions before commencing installation. This cylinder range does not incorporate an internal heat exchanger. Please leave this manual with the customer for future reference. Andrews. Built to perform.
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Page 2: Table Of Contents
Contents Product Specification Introduction General requirements THE BENCHMARK SCHEME Checklist Storage and handling Technical data ErP data information Immersion allocation table Thermostat control schematics Wiring Schematics Limitations Water supply Installation & Commissioning General Installation Cold Water Supply Secondary circulation and De-Stratification Discharge Pipe work Direct Model Commissioning... -
Page 3: Product Specification
Building Regulation Part L. The Andrews Flexistor unvented water heater can be fed directly from the cold water mains supply to the property without the need for separate feed cisterns or vent pipes. It is supplied complete with all its necessary inlet and safety controls. -
Page 4: Checklist
Checklist (if purchased through Heatrae Sadia) Before commencing installation check that all the components for your Andrews Flexistor unit are contained in the package. The following components are supplied as standard with your Andrews Flexistor unit: Commercial Cylinder Vol- Pressure Reducing Valve... -
Page 5: Storage And Handling
To aid installation, the Andrews Flexistor is provided with lifting points located at the top of the unit. To access the lifting eyes please remove the red outlet gromett and the top cover. The weights of the units are noted on Table 5. -
Page 6: Technical Data
Technical data (Indirect models in conformance with BS EN 12897:2006) Maximum mains water supply pressure 2.5MPa (25 bar) Operating pressure/PRV (low pressure system) 0.60MPa (6. bar) Operating pressure/PRV (high pressure system) 1.00MPa (10 bar) Expansion vessel pressure (low pressure system) 1.0MPa (10 bar max) Expansion vessel pressure (high pressure system) 1.6MPa (16 bar max) - Page 7 FIGURE 2: Flexistor Dimensions Connection 400 500L Connection 1000L Connection 1250 - 1450L Connection 2000 - 2500L 2” BSP 2” BSP 2” BSP 2”BSP ½”BSP ½”BSP ½”BSP ½”BSP 1138 1416 1502 1897 1466 1721 1493 1886 ½”BSP ½”BSP ½”BSP ½”BSP 1001 1191 1263...
- Page 8 2” BSP Hot Outlet 1 ¼” BSP T&P Connection 2” BSP ½” BSP Secondary Flow Sensor pockets 2” BSP Cold Inlet 2” BSP Secondary Return FIGURE 3: Flexistor Connections NOTE: All connections BSP female threads N o m i n a l Unit Weight (kg) Capacity Empty...
- Page 9 N o m i n a l Per Day Per Year Capacity (kWh/24h) kWh/24h) (Litres) 1.72 2.14 2.74 1000 3.33 1215 1000 3.60 1314 1250 3.90 1423 1450 4.30 1569 2000 2500 4.50 1642 Table 6: Standing heat-loss Testing is carried out to BS EN12897:2006 N o m i n a l Maximum kW ratings Capacity...
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Page 10: Immersion Allocation Table
Element 94110301 94110302 94110303 94110304 94110305 94110306 94110307 94110308 94110309 Location ... -
Page 11: Wiring Schematics
Wiring Schematic Single phase wiring schematic Earth Neutral Live Fuse (not supplied) Contactors (not supplied) Live Live marked ‘L’ Earth Earth Neutral terminal marked 'N' Typical head layout for a single phase heater Neutral Cut-Out Temperature 80°C Immersion Heater (Factorey set) FIGURE 5: Single phase wiring schematic Note: The 2 external contactors must be approved... -
Page 12: Limitations
Limitations • The Andrews Flexistor unvented water heater should not be used in any of the following instances: • Solid fuel boilers or any other boiler in which the energy input is not under effective thermostatic control unless additional and appropriate safety measures are installed. -
Page 13: Installation & Commissioning
The pressure reducing valve can be connected anywhere on the cold water mains supply prior to the Andrews Flexistor unit. There is no requirement to site it close to the unit, it can be located at a point where the mains supply enters the premises if this is more convenient but you must install a non-return valve just after the reducing valve for ease of maintenance. - Page 14 Pressure reducing valve Pressure relief 1.5 - 6 bar or 5 - 10 bar valve, 8 bar or 13 bar direction direction Pressure relief discharge Mains water in To cylinder Pressure gauge connections (one each side) compression connections Figure 07: Cold water combination valve (for 400 & 500ltr) THERMAL CUT-OUT PROBE CONTROL HOUSING...
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Page 15: Secondary Circulation And De-Stratification
TYPICAL DE-STRATIFICATION LOOP SYSTEM Hot water outlet Check Valve (not supplied) SECONDARY De-stratification pump CIRCULATION Balanced cold Check valve water connection Pressure relief WRAS approved valve Pressure reducing pump valve Direction of flow Mains water Secondary supply return Tundish Discharge To Drain pipe Expansion... - Page 16 Outlet Pipe work Ideally the pipe work from the Andrews Flexistor to the outlet fittings should be in 2” pipe, smaller bore pipe can be used but it could impact on the performance of the unit. Small bore pipe can also be used to suit some taps, but runs should be of minimum length.
- Page 17 The following extract is taken from latest G3 Regulations Discharge pipes from safety devices Discharge pipe D1 3.50 Safety devices such as temperature relief valves or combined temperature and pres- sure relief valves (see paragraphs 3.13 or 3.18) should discharge either directly or by way of a manifold via a short length of metal pipe (D1) to a tundish.
- Page 18 Note: An alternative approach for sizing discharge pipes would be to follow Annex D, section D.2 of BS 6700:2006 + A1:2009 Specification for design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages. 3.59 Where a single common discharge pipe serves more than one system, it should be at least one pipe size larger than the largest individual discharge pipe (D2) to be connected.
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Page 19: Discharge Pipe Work
5. The tundish must be installed so that it is visible to the end user. 6. The tundish and drain valve must be installed away from any electrical components. 7. No valve should be fitted between the 8 bar or 13 bar pressure relief valve and the Andrews Flexistor unit. - Page 20 Notes: 1) Discharge pipe-work D2 can now be a plastic pipe but only pipes that have been tested to a minimum 110°C must be used. 2) Discharge pipe D2 can now be plumbed in the soil stack but only soil stacks that can handle temperatures of 99°C or greater should be used.
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Page 21: Direct Model
(20Nm or 14.75 ft/lb) as per the Commercial Immersion heater fitting instructions (36006161). Wire up the immersion heater as per Fig 5 or Fig 6, page 11 or Andrews Flexistor immersion heater fitting instructions. Refill the cylinder and check for leaks. Turn on the supply and set the thermostat temperature to the desired water temperature (60°C - 65°C is recommended). -
Page 22: Commissioning
The customer should then countersign the Benchmark commissioning checklist to accept completion. The Service Record should be filled in when any subsequent service or maintenance operation is carried out on the Andrews Flexistor unit. See pages 32 and 33 for Benchmark... -
Page 23: Maintenance & Servicing
Switch off the electrical supply to the immersion heater(s) and primary heat source, if used. Turn off the mains water supply to the Andrews Flexistor unit. Attach a hosepipe to the drain valve having sufficient length to take water to a suitable discharge point below the level of the unit, at least one metre below the unit is recommended. - Page 24 Benchmark On completion of any maintenance or service of the Andrews Flexistor, the Benchmark “Installation, Commissioning and Service Record”, Pages 32 & 33, should be filled in to record the actions taken and the date the work was undertaken. Maintenance Under normal circumstances the control valves should not require any maintenance.
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Page 25: Fault Finding
NEVER bypass any thermal controls or operate system without the necessary safety valves. v) Water contained in the Andrews Flexistor unit may be very hot, especially following a thermal control failure. Caution must be taken when drawing water from the unit. -
Page 26: Spares
Spare parts A full range of spare parts are available for the Andrews Flexistor range. Refer to the Technical Data label on the unit to identify the model installed and ensure the correct part is ordered. Description Spares Number Immersion Heater Gasket... -
Page 27: Accessories
Pressure gauge 95970142 Temperature gauge (calibrated) 95970017 Pressure gauge (calibrated) 95970016 Flexistor 400/500L 6 bar cold water control kit 7038498 Flexistor 800L 6 bar cold water control kit 7038499 Flexistor 1000L 6 bar cold water control kit 7038500 Flexistor 1250L 6 bar cold water control kit... -
Page 28: Spares Drawings
Part Part 95:607:396 95:611:025 10-48 43-47 Part Part 95:607:_ _ _ 95:605:_ _ _ 11-14 Part Part 95:605:_ _ _ 95:605:182 17-22 Part Part 95:605:_ _ _ 95:607:452... - Page 29 23-25 26-29 Part Part 95:605:_ _ _ 95:605:_ _ _ 30-31 Part Part 95:605:_ _ _ 95:612:650 Part Part 7031593 95:980:025 35&36 Part Part 95:607:_ _ _ 95:605:177...
- Page 30 Part Part 95:980:009 95:607:690...
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Page 34: Warranty
` The Andrews water heater has not been subjected to excessive pressure beyond the guidelines detailed in the installation instructions. ` The Andrews water heater has not been subjected to frost, nor has it been tampered with or been subject to misuse or neglect. - Page 35 The Environment This product is made from many recyclable materials, therefore at the end of its useful life it should be disposed of at a local authority recycling centre in order to realise the full environmental benefits. Insulation is by means of an approved HCFC/CFC free polyurethane foam.
- Page 36 Customer support ICOM Energy Association 8am-5pm, Monday-Friday 0345 070 1055 andrewswaterheaters.co.uk linkedin.com/company/andrews-water-heaters @AndrewsWH 500403 Andrews. Built to perform. a Baxi Heating brand Registered office address: Andrews Water Heaters 3 Innovation House, Oaklands Business Centre, Oaklands Park, 7038476_issue _04 Wokingham RG41 2FD...
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