Heatrae Sadia Multipoint 30H, Fitting Instructions Manual

Page: 8 / 20

8
WARNING
Failure to provide adequate pressure relief
will invalidate any warranty and lead to a
dangerous installation.
Discharge
`
It is a requirement of Building Regulation G3
that any discharge from an unvented system is
conveyed to where it is visible, but will not cause
danger to persons in or about the building.
The tundish and discharge pipes should be
fitted in accordance with the requirements and
guidance notes of Building Regulation G3. The
G3 Requirements and Guidance section 3.50 -
3.63 are reproduced in the following sections of
this manual. For discharge pipe arrangements
not covered by G3 Guidance advice should be
sought from your local Building Control Officer.
Any discharge pipe connected to the pressure
relief devices (expansion valve and temperature/
pressure relief valve) must be installed in a
continuously downward direction and in a frost
free environment.
`
Water may drip from the discharge pipe of the
pressure relief device. This pipe must be left
open to the atmosphere. The pressure relief
device is to be operated regularly to remove lime
deposits and to verify that it is not blocked.
G3 Requirement
“...there shall be precautions...to ensure that the
hot water discharged from safety devices is safely
conveyed to where it is visible but will not cause
danger to persons in or about the building.”
The following extract is taken from the latest G3
Regulations
Discharge pipes from safety devices
Discharge pipe D1
`
3.50 – Each of the temperature relief valves
or combined temperature and pressure relief
valves specified in 3.13 or 3.17 should discharge
either directly or by way of a manifold via a short
length of metal pipe (D1) to a tundish.
`
3.51 – The diameter of discharge pipe (D1)
should be not less than the nominal outlet size
of the temperature relief valve.
`
3.52 – Where a manifold is used it should be
sized to accept and discharge the total discharge
from the discharge pipes connected to it.
`
3.53 – Where valves other than the temperature
and pressure relief valve from a single unvented
hot water system discharge by way of the same
manifold that is used by the safety devices, the
manifold should be factory fitted as part of the
hot water storage system unit or package.
6. Installation
6.1 General
After reading the previous sections in this booklet
and choosing a good location for the product please
install, paying attention to the following hydraulic,
electrical and commissioning sections.
6.2 Water connections
WARNING
`
Under no circumstances should
the factory fitted temperature/
pressure relief valve be removed
other than a competent person. To
do so will invalidate any warranty
or claim.
`
No control or safety valve should
be tampered with or used for any
other purpose.
`
The discharge pipe should not
be blocked or used for any other
purpose.
`
The tundish should not be
located adjacent to any electrical
components.
Refer to the Installation schematic (figure 4, page
6) to determine which valves and accessories are
required.
Plumb in the valves in the sequence shown in the
relevant figures 4, page 6.
`
The water connections are 15mm diameter
copper tubes suitable for compression fittings.
Do not use solder joints as this will damage
the heater and may prevent servicing under
warranty.
`
The INLET is marked BLUE, the OUTLET is
marked RED. The WRAS listed isolating valve
(supplied) must be fitted on the cold water supply
to the product. Several hot outlets can be served.
`
A drain valve must be fitted below the heater in
the inlet pipework. It must be sited between the
heater and the check valve (see figure 4 page 6).
`
Plumbers Paste must not be used as it can
impair the operation of the valves.
`
The product MUST be fitted with a Pressure
Relief Valve. The factory fitted Temperature/
Pressure Relief Valve can fulfill this function.