The model 30L is covered under the Building Regulations and therefore it is not
possible to accommodate the expansion water within the system pipe work and
consequently a set of expansion controls must be installed.
Note: The discharge from relief valves must be made in a safe and conspicuous
manner; therefore a tundish (Kit C) is available for 10 and 15 litre units if required.
Please note that in all cases the dielectric junctions must be connected to the
heater before any other connection is made (these prevent an electrolytic
reaction).
Only the use of copper pipe is recommended for connection to the heater. If any
other material is used it must be able to withstand 90°C at 7 bar pressure for
long periods.
No valve must be fitted between the expansion/pressure relief valve and the
water heater.
All other required safety components to install the model 30L are supplied as a
kit with the appliance:
15mm pressure reducing valve set at 3.5bar.
Expansion vessel (charge pressure set at 3.5bar)"
c) DISCHARGE PIPE WORK NOTE:
The following guidelines refer to Building Regulation G3. It is good practice to
follow these guidlines for all relief valve discharge pipe work.
1) The tundish must be vertical and fitted within 600 mm of the temperature &
pressure relief valve and must be located with the cylinder. The tundish must also be
in a position visible to the occupants, and positioned away from any electrical devices.
The discharge pipe from the tundish should terminate in a safe place where there is
no risk to persons in the vicinity of the discharge and to be of metal.
2) Discharge pipes from the temperature & pressure relief and pressure relief valve
may be joined together.
14
Fig. 3
(Models 30L)
The tundish must be installed away from electrical devices.
