Summary of Contents for McDonald Engineers UK THERMflow
- Page 1 THERMflow Boiler Model Technical Manual McDonald Engineers UK November 2017 flow THERM Boiler Model Technical Manual HOT WATER SOLUTIONS SINCE 1945...
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Page 2: Table Of Contents
THERMflow Combination General Schematic ............. 5 THERMflow Cylinder General Schematic ............. 6 THERMflow Connection Heights................7 THERMflow with External PHE ................8 THERMflow Combination with PHE General Schematic ........9 THERMflow Cylinder with PHE General Schematic ........... 10 Commissioning....................11 Commissioning Best Practice ................12 Troubleshooting.................... -
Page 3: Design
Handling & Storage It is important the THERMflow is handled with care and stored the correct way up in a dry place at all times prior to, during and after installation. Any manual lifting will need to comply with the requirements of the Manual Handling Operations Regulations issued by the Health &... -
Page 4: What Is A Thermal Store
Basics of the Thermal Store The THERMflow Boiler Model utilises open vented boilers and/or Electric Immersion Heaters as its primary heat source/s, with options available for wood burning, AGA, solid fuel boiler and underfloor connections amongst others. -
Page 5: Mains Water Supply
Water Treatment The THERMflow is part of the primary system and while it does not require any special water treatment itself, the radiators and other parts of the primary circuit will require the application of a protective scale and corrosion inhibitor such as Fernox to ensure adequate protection. -
Page 6: Thermflow Combination General Schematic
flow THERM Combination General Schematic Maintenance Free Jetseal Ballvalve Overflow (Not fitted as standard) Hot Out c/w Thermostatic Mixing Valve 22mm Boiler Flow (Other Sizes Available) 28mm Solid Fuel Flow (Other Sizes Available) 2 Litre High Efficiency Expansion Secondary Coil Bottle Thermometer High-Limit... -
Page 7: Thermflow Cylinder General Schematic
flow THERM Cylinder General Schematic 22mm Vent Hot Out c/w Thermostatic Mixing Valve 22mm Boiler Flow (Other Sizes Available) 28mm Solid Fuel Flow (Other Sizes Available) Secondary Return (Optional) High Efficiency 2 Litre Secondary Coil Expansion Bottle Thermometer High-Limit Stat Cold Mains Secondary Water @ 90⁰C ⁰C... -
Page 8: Thermflow Connection Heights
Bespoke options for specific installation are available and will be supplied with a sketch prior to manufacturing of the THERMflow. Capacity (Litres) 900 x... -
Page 9: Thermflow With External Phe
An External Plate Heat Exchanger (PHE) can be fitted to a THERMflow in replacement of the internal High Efficiency Coil. A THERMflow with an External PHE is an alternative to the standard thermal store, for properties with varying hot water demands. Instead of an internal High Efficiency Coil, a Plate Heat Exchanger is fitted to the external pipework of the cylinder. -
Page 10: Thermflow Combination With Phe General Schematic
flow THERM Combination with PHE General Schematic Maintenance Free Jetseal Ballvalve Overflow Hot Out (Not fitted as standard) c/w Thermostatic Mixing Valve External Plate Heat Exchanger 22mm Boiler Flow (Other Sizes Available) 28mm Solid Fuel Flow (Other Sizes Available) Cold Mains Secondary Water c/w Flow Switch Wiring Centre... -
Page 11: Thermflow Cylinder With Phe General Schematic
flow THERM Cylinder with PHE General Schematic Hot Out 22mm Vent c/w Thermostatic Mixing Valve External Plate Heat Exchanger 22mm Boiler Flow (Other Sizes Available) 28mm Solid Fuel Flow (Other Sizes Available) Cold Mains Secondary Water c/w Flow Switch Wiring Centre Thermometer High-Limit Stat @90⁰C... -
Page 12: Commissioning
Turn the Boiler Control Thermostat down slowly till it clicks off, then turn it to 75°C. (This should mean that the cylinder thermostat on the THERMflow controls the system. This can be checked by running off some hot water which should lead... -
Page 13: Commissioning Best Practice
Use a combined feed and vent. Use tube smaller than 28mm between boiler and THERMflow if the boiler exceeds an output of 60,000 Btu (17kW) output. Place any clothing or other combustible materials against or on the THERMflow. -
Page 14: Troubleshooting
Troubleshooting Below contains a troubleshooting and solution guide to the thermal store system. If this table does not resolve your problem, please contact either your installer or phone McDonald Engineers UK Technical Team for further advice. SYMPTOM SOLUTION The thermal store is designed to work best when the store temperature is at or approaching 75°C - 80°C. - Page 15 We recommend that the Feed & Expansion Tank should be sized to approximately 15% capacity of the total system to cope with the thermal expansion. *Sizes indicated are from McDonald Engineers UK Feed & Expansion Tank Sizes Feed & Expansion Tank Capacity Calculator Cylinder Capacity...
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Page 16: Schematics
Schematics... - Page 17 Pump Kit Wiring Diagram...
- Page 18 flow THERM with External PHE, Wiring Diagram Wiring Centre Flow Switch Charging Pump Mains...
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Page 19: Ancillary Descriptions
75°C- 80°C and control the boiler. The Solid Fuel Stat will be linked to the Central Heating Pump and will pump part of the contents of the THERMflow to a heat leak radiator in order to cool down the thermal store in the event of an overheat situation from an uncontrollable heat source such as solid fuel. - Page 20 35kW. THERMflow Programmer (WTPROG) The THERMflow programmer allows you to set “On” and “Off” time periods to switch the central heating on and off to suit the user’s requirements.
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Page 21: Installing A Gravity System
In absence of recommendations from the solid fuel boiler manufacturer as to the best layout, McDonald Engineers UK would advise the following layout would be most suitable to achieve the best performance from a gravity circulation layout, key points to... - Page 22 Hot Water Solutions Since 1945 The HWA Charter Statement requires that all members adhere to the following: To supply fit for purpose products clearly and honestly described To supply products that meet or exceed appropriate standards and building and water regulations ...
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