Adey CP1-03-04914 Installation And Servicing - Page 7

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6 . The flexible hose and any wiring can be retained in the desired position

using cable ties and the two metal cable retention points on the top left

and right of the APU tank . See Figs . 10 & 11 .

7 . The warning pipe should be connected to a suitable drain via a tundish

enabling visual warning of an overflow condition . The overflow fitting is

designed to use 19 to 23 mm diameter plastic waste pipe or connect to

G ¾ threaded pipe . Ensure there is a demountable joint in the pipe to

allow the removal of the APU Midi if needed .

8 . Non-return valves, pressure reducing valves and RPZ valves MUST NOT

be installed between the APU Midi and the heating/cooling system . These

devices will prevent the pressure sensor from reading the system pressure

and will lead to incorrect operation of the unit .

9 . The APU Midi should be connected to the system return header along with

the expansion vessels as specified in BS 7074 . See Fig . 12 .

4 .16 Typical installation diagram:

Expansion

vessel

APU Midi

Warning pipe

4 .17 Vessel sizing & location:

1 . System expansion vessel sizing should comply with the BS 7074 Expansion

Vessel sizing calculation .

2 . The pressurisation unit and expansion vessels should be connected to the

system at the same point, to provide a neutral pressure reading .

3 . A lockshield valve and drain valve should be installed at the inlet of each

expansion vessel to allow for servicing .

Fig . 13

Isolation

Drain

valves

valve

Fig . 12

Lockshield

valve

Drain valve

- 12 -

5 ELECTRICAL INSTALLATION / EARTHING

5 .15 Adjacent pipes: Adjacent suction and delivery pipes should be fitted with

earthing clamps in accordance with current regulations (Fig . 14) .

Return

header

5 .16 Earthing: This appliance must be earthed via the supply cord .

5 .17 Pipework: Copper or metallic pipework must have supplementary earth

bonding where the continuity has been broken by flexible hoses or plastic

components .

5 .18 Additional earthing: Certain installations may require additional earthing

arrangements such as equipotential bonding . Reference should be made to

the relevant regulations concerning this subject to ensure compliance .

5 .19 Connections: The APU Midi must be connected to a dedicated fused SPUR via

a lockable isolator to avoid unauthorised disconnection .

5 .20 The electrical connection must be made adjacent to (not behind) the APU

Midi to allow disconnection of the electrical supply should the pump module

need to be removed for service or maintenance .

5 .11 Regulations: The electrical installation must be carried out in

accordance 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 be installed in the supply circuit .

This may be part of a consumer unit or a separate unit .

5 .13 Before starting work on the electrical supply ensure power supply is

isolated .

5 .14 DO NOT allow the supply cord to contact hot surfaces, including the

motor shell, pump body or pipework . The cord should be safely

routed and secured by cable clips .

Flexible

hoses

Fig . 14

- 13 -

Earth continuity

connection

Metallic

pipework