page no. 12 of 44
HEMNVx & HEMSL Range Users, Installation & Servicing Instructions Doc Ref M103 issue 3.6 Mar 2020.
All HEM heaters comply with the following European
Directives:
Energy Related Product Directive:
2009/125/EC*
Gas Appliance Directive:
2009/142/EC
Electromagnetic Compatibility Directive: 2004/108/EC
Low Voltage Directive:
2006/95/EC
Machinery
Directive:
2006/42/EC
Air heater(s) must be installed in accordance with
BS6230
and
BS5440
plus any relevant requirements of local and
national building codes.
* where appropriate
.
Wiring external to the air heater must be installed in
accordance with the I.E.E. Regulations for Electrical
Installations and any local regulations which apply.
All standard heaters are supplied by 230V - 1ph, 50Hz.
The method of connection to the main electricity supply
must:-
- facilitate the complete electrical isolation of the unit(s)
via a suitable fused isolator (see section 2.4.5 for ratings)
- be in a readily accessible position adjacent to the unit(s)
- serve only the unit(s)
- have a contact separation of at least 3mm in all poles.
See the accompanying wiring diagram for the heater
electrical connections.
A servicing valve and union to facilitate servicing must
be fitted to the gas inlet pipe work of the heater. The
gas supply must be completed in solid pipe work and be
adequately supported.
WARNING: When completing the final gas
connection to the heater do not place undue
strain on the gas pipe work of the heater
.
The local gas undertaking should be consulted at the
installation planning stage in order to establish the
availability of an adequate supply of gas to suit the
building requirements. An existing service pipe must not
be used without prior consultation with the local gas
undertaking.
An existing meter should be checked, preferably by the
gas undertaking, to ensure that the meter is adequate
to deal with the total rate of gas supply required by all
connected equipment.
Installation pipes should be fitted in accordance with IGE/
UP/2. Pipe work from the meter to the air heater must be
of adequate size.
Do not use pipes of a smaller size than the inlet gas
connection of the heater.
The complete installation must be tested for soundness
as described in the above Code.
Refer to tables detailed on next page for calculated free
areas of ventilation grilles.
Refer to Index 1 for Air inlet/exhaust flue and ventilation
sketches
Where AHU's are installed within the heated space
(ie not in a plant room)
and having a building design air
change rate of greater than 0.5/h, additional provision for
ventilation is
not required.
If the building design air change rate is
less than
0.5/h,
additional provision for natural or mechanical ventilation
is required.
These being:
Natural Ventilation:
Grilles having a free area of at least
2cm² per kW of rated heat input shall be provided at low
level i.e. below the level of the heater flue connection.
or
Mechanical Ventilation:
Must ensure that the space air
change rate is at least 0.5/h, must be of the ‘input’ type
and interlocked to ensure the heaters cannot work if the
input system is not working.
