Adey Midi 235 Installazione e assistenza - Pagina 5

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3 KEY FEATURES

3 .11 The APU Midi comprises of the following main components:-

1 . Moulded tank – Main body of the APU, comprising of an integrated water

tank with warning pipe and weir overflow and mounting the brass pump

assembly, manifold and controller .

2 . Pump assembly – One or two brass peripheral pump units powered by

induction motors, with integrated non return valves and venting screw .

Mounted into the moulded tank with vibration isolating rubber mounts .

3 . Outlet manifold – Brass manifold with pressure transducer used to monitor

system pressure and connection to the pump(s) .

4 . Programmable controller – Intuitive, user set controller allowing system set up

and easy alarm connection .

5 . Wall mounting plate – Robust stainless steel wall mounting plate allowing

quick, easy installation and removal if needed .

6 . Moulded cover – Moulded acrylic capped ABS cover retained to the

moulded tanks with Dual Lock

access .

3 .12 Principle of operation: The pressurisation unit consists of a break tank and

one/two peripheral pumps . The break tank is supplied with mains water from

either the left or right through a flexible hose connected to a float valve and

includes an overflow and weir to maintain an AB air gap in the tank . The unit is

connected to the heating/chiller system via another flexible hose which can

exit the unit 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 controller runs the pumps until the system is re-

pressurised to the required pre-set level . If the unit only has a single pump

connected it will run continuously until this level is reached, if the unit is a

twin pump model the pumps run in duty standby mode (the controller will

alternate which pump starts first to even the wear on the pumps) . The pumps

are fitted with non-return valves to ensure system pressure is maintained once

pressurised .

fastening system for quick and easy

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4 INSTALLATION

4 .11 Fill valve flow restrictor guidelines: The side entry fill valve must be fitted

with the correct filter and flow restrictor combination (dependant on the

mains water pressure) into the G ½ threaded tail as outlined below:

Coloured insert - To be used for water pressure between 1 and 4 bar

White insert - To be used for water pressure above 4 bar

4 .12 Cold mains feed connection: The connection to the cold water mains inlet is

made using the 15 mm compression flexible hose supplied . Ensure the rubber

sealing washer supplied with the hose is installed when the hose is fitted .

Fig. 3

When tightening ensure the fill valve within the tank is not rotated . If the

valve is rotated it may not function correctly with the risk of flooding . The

hose is made water tight with a sealing washer on assembly, nip tight to

4 to 5 Nm for water tight seal . (Do not overtighten) . See Fig . 6 .

Fig. 4

Fig. 5

Fig. 6

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