VOKERA Mynute EHE Installation & Servicing Instructions Manual - page 10
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condense on leaving the terminal; the effect of such pluming
must be considered.
If installed less than 2m above a
pavement or platform to which people have access (includ-
ing balconies or flat roofs) the terminal must be protected
by a guard of durable material. The guard must be fitted
centrally over the terminal. Refer to I.S. 813, when the
terminal is 0.5 metres (or less) below plastic guttering or 1
metre (or less) below painted eaves.
3A.5
AIR SUPPLY
The following notes are intended for general guidance
only.
This appliance is a room-sealed, fan-flued boiler, conse-
quently it does not require a permanent air vent for combus-
tion air supply.
When installed in a cupboard or compartment, ventilation
for cooling purposes is also not required.
3A.6
WATER CIRCULATION
Specific recommendations are given in I.S. 813. The fol-
lowing notes are for general guidance only.
3A.6.1 PIPEWORK
It is recommended that copper tubing be used in conjunc-
tion with soldered capillary joints.
Where possible pipes should have a gradient to ensure air
is carried naturally to air release points and that water flows
naturally to drain cocks.
Except where providing useful heat, pipes should be
insulated to avoid heat loss and in particular to avoid the
possibility of freezing. Particular attention should be paid
to pipes passing through ventilated areas such as under
floors, loft space and void areas.
3A.6.2 AUTOMATIC BY-PASS
The appliance has a built-in automatic by-pass, conse-
quently there is no requirement for an external by-pass,
however the design of the system should be such that it
prevents boiler ‘cycling’.
3A.6.3 DRAIN COCKS
These must be located in accessible positions to facilitate
draining of the appliance and all water pipes connected to
the appliance.
3A.6.4 AIR RELEASE POINTS
These must be positioned at the highest points in the
system where air is likely to be trapped. They should be
used to expel trapped air and allow complete filling of the
system.
3A.6.5 EXPANSION VESSEL
The appliance has an integral expansion vessel to accom-
modate the increased volume of water when the system is
heated. It can accept up to 8 litres of expansion from within
the system, generally this is sufficient, however if the
system has an unusually high water content, it may be
necessary to provide additional expansion capacity (see
6.19).
3A.6.6 FILLING POINT
A method for initial filling of the system and replacing water
lost during servicing etc. is required (see fig. 5). You should
ensure this method of filling complies with the local water
authority regulations.
3A.6.7 LOW PRESSURE SEALED SYSTEM
An alternative method of filling the system would be from
an independent make-up vessel or tank mounted in a
position at least 1 metre above the highest point in the
system and at least 5 metres above the boiler (see fig. 5a).
The cold feed from the make-up vessel or tank must be fitted
with an approved non-return valve and stopcock for isola-
tion purposes. The feed pipe should be connected to the
return pipe as close to the boiler as possible.
3A.6.8 FREQUENT FILLING
Frequent filling or venting of the system may be indicative
of a leak. Care should be taken during the installation of the
appliance to ensure all aspects of the system are capable
of withstanding pressures up to at least 3 bar.
3A.7
ELECTRICAL SUPPLY
The appliance is supplied for operation on 230V @ 50Hz
electrical supply; it must be protected with a 3-amp fuse.
The method of connection to the mains electricity supply
must allow for complete isolation from the supply. The
preferred method is by using a double-pole switch with a
contact separation of at least 3,5mm (3° high-voltage
category). The switch must only supply the appliance and
its corresponding controls, i.e. time clock, room thermostat,
etc.
3A.8
MOUNTING ON A COMBUSTIBLE SURFACE
If the appliance is to be fitted on a wall of combustible material,
a sheet of fireproof material must protect the wall.
3A.9
TIMBER FRAMED BUILDING
If the appliance is to be fitted in a timber framed building,
it should be fitted in accordance with I.S. 813 and local
Building Regulations. The Institute of Gas Engineers pub-
lication (IGE/UP/7) ‘Guide for Gas Installations in Timber
Frame Buildings’ gives specific advice on this type of
installation’.
3A.10 INHIBITORS
Vokera recommend that an inhibitor - suitable for use with
copper and aluminium heat exchangers - is used to protect
the boiler and system from the effects of corrosion and/or
electrolytic action. The inhibitor must be administered in
strict accordance with the manufacturers instructions*.
*Water treatment of the complete heating system – includ-
ing the boiler – should be carried out in accordance with I.S.
813 and the Domestic Water Treatment Association’s
(DWTA) code of practice.
3A.11 DECLARATION OF CONFORMITY
A Declaration of Conformity (as defined in I.S. 813) must be
provided on completion of the installation. A copy of the
declaration must be given to the responsible person and
also to the gas supplier if required.