Installation and servicing
Midi 135/150/235/250
Digital Pressurisation Unit
Page 1: ...Installation and servicing Midi 135 150 235 250 Digital Pressurisation Unit...
Page 2: ...rated with the front cover in place z In the interests of electrical safety a 30 mA residual current device R C D not supplied should be installed in the supply circuit This may be part of a consumer...
Page 3: ...l cause leakage 1 16 Secure pipework Ensure pipework to and from pump is independently supported clipped to prevent forces being transferred to inlet and outlet branches of the unit Do not secure pipe...
Page 4: ...ny spillage is contained or routed to avoid electrics or areas sensitive to water damage As part of the AB airgap CAT 5 fluid isolation the APU has a weir type overflow on the right hand side water wi...
Page 5: ...nit on either the left or right The pumps are connected to the tank via a rubber connector A pressure transducer monitors system pressure and if a reduction in system pressure is detected the controll...
Page 6: ...which the APU Midi is located is flat and level 3 If possible locate the unit against a wall for added stability 4 If the APU Midi is located in an area that might be subjected to flooding mount the A...
Page 7: ...dance with the current national electrical regulations and installed by a qualified person 5 12 Safety In the interests of electrical safety a 30 mA residual current device R C D not supplied should b...
Page 8: ...for boiler chiller shut down in the event that the APU Midi detects system pressure above the Hi alarm pressure or below the Lo alarm pressure The boiler interlock contact will be open circuit below t...
Page 9: ...to function correctly the following conditions must be met If these conditions have not been met the commissioning process should not continue z Ensure the system connection has been made into the hea...
Page 10: ...ctivity Pump run time Alarm reset 6 18 Setting menu Pass code protected if set The following functions can be set and modified System pressure 2 see Fig 20 Sets the required system pressure Set in 0 1...
Page 11: ...able from 3 to 120 seconds pre set to 3 seconds Increasing this time will reduce un wanted APU Midi operation during rapid system pressure fluctuations circulator pump starts Pump test Forces pump 1 L...
Page 12: ...pressure error and the red error light will illuminate on the front of the APU this is normal z Open the isolation valve on the outlet of the APU and the APU will run and start to fill the system 6 2...
Page 13: ...on the screen may be shown slightly higher than the set pressure whilst the pump is running As soon as the pump stops this displayed reading will settle back to the actual system pressure During the n...
Page 14: ...ng order after a prolonged period of maintainance the following steps should be taken 1 Inspect the APU for signs of damage 2 Check APU tank for debris remove debris and clean tank if needed Debris ma...
Page 15: ...em Activate system fill option to suppress alarm for 24 hours Leak in system Check system for leakage Monitor using system fill volume log reset if needed Increase pump run time limit Activity high al...
Page 16: ...pump operation Float valve operation x Level probe operation x Water condition x Exp vessel pre charge x Comments Service No 2 Date Engineer name Company name Tel No System pressure bar Differential...
Page 17: ...Office Gloucester Road Cheltenham GL51 8NR United Kingdom Object of the declaration Pressurisation Unit The object of the declaration described above is in conformity with the relevant Union harmonisa...
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