"Midi-Break" - Break Tank & Booster Set
Part Number: BTMIDI
BTMIDI-1 / 2A /3A
Wall mounted break tank and pump assembly with Fluid Category 5 protection by virtue of the integral Type AB air gap complying with BS EN13077: 2003. The set is housed in a stainless steel cabinet - with drainage holes in its base - ready for wall mounting in a frost free environment.
The primary purpose is to provide backflow protection in accordance with the new Water Regulations. The Midi unit also provides cold water at a known outlet pressure. Where hot water is required – see Ablution Plant – BTHW
Three models are available with differing flow characteristics. The Midi-1 is often used for a basic shower, Midi-2A for more pressure & Midi-3A for highest flow & pressure, such as a single hose union tap. The Midi-3A is built to a higher specification for commercial use with many additional features. For higher flow rates (multiple taps) where a good jet from a hose gun is required - use “Boost-A-Break” (model BTAB900, BTAB1200 or BTAB3-10).
The unit is quiet since the pump is mounted on anti vibration mounts with flexible - stainless braided – internal hoses.
Automatic pump control is by means of a pressure vessel, industrial pressure switch and a flow sensor. This system provides reliable pump operation with the minimal amount of starts. The pump has a “soft start” feature, which avoids water and electrical surges. The pump is protected via low level float switch in the cistern.
Where indicated on the drawing a Break Tank & Booster Set – model BTMIDI-3A1 shall be installed - as manufactured and distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk. The output pressure shall be 1.9 bar @ 0.20 lt/s and a closed valve head of 3.1 bar2. The unit shall be housed in a stainless steel cabinet which shall be mounted on a wall at a serviceable height. The internal cistern shall provide a type AB air gap. The cistern level shall be controlled automatically by a servo solenoid valve operated via stainless steel conductive electrodes and controller. The set shall incorporate a pump anti-seize pulse timer feature. A volt free BMS fault relay shall be provided3. A low-level pump cut-out shall automatically reset once the cistern is sufficiently full. The pump shall be continuously rated, feature brass wetted parts and be acoustically attenuated with anti-vibration mounts. The 22 mm overflow shall discharge in a safe and conspicuous manner. A 15 mm supply is required, which must maintain a dynamic pressure of 1.0 bar. The manufacturer’s flexible hose with servicing valve and strainer (supplied) shall be installed.
Amend as required:
 1.5 bar @ 0.15 lt/s and a closed valve head of 2.2 bar (for BTMIDI-1)
 1.5 bar @ 0.20 lt/s and a closed valve head of 3.0 bar (for BTMIDI-2A)
 delete for BTMIDI-1
The following are Fluid Category 5 examples from the Water Regulations (Table 6.1e) -
• Waste bin washing - single tap
• Hose union taps – non-domestic
• Wash-down – animals or any Fluid Category 5
• Underground or surface irrigation
• Baths in health care premises
• Sinks with hoses
• Bidet washing
• Vegetable washing
• Butchery & meat equipment / slaughterhouse
• Clothes washing machines – healthcare premises
• Dish washing machines – healthcare premises
• Instantaneous showers and heaters - care premises
• Applications deemed to be Category 5 by water company