7
Sales/Spares & Replacement Help Line 01604 762881
6.
HEATER POSITIONING
6.1
This heater is not suitable for external installation unless it is protected from the elements by
a suitable enclosure. The enclosure must provide the clearance for installation, servicing and
maintenance as well as the correct level of ventilation. The selected position should allow for a
suitable flue system to be installed.
6.2
When installed in a timber frame, building guidance should be taken from the Gas Industry
Publication IGE / UP-7 (Guide for Gas Installations in Timber Frame Housing).
6.3
BS 6798 gives details of the essential features for a compartment or cupboard where a gas
appliance is to be installed. An existing cupboard may require modifications.
6.4
If the heater is installed in a room containing a bath or shower it is important to locate the electrical
switch in a position where it cannot be touched by anyone using the bath or shower. The current
IEE Wiring Regulations (BS 7671) for England and electrical provision of the Building Regulations
for Scotland gives details.
6.5
Room ventilation for the heater is not necessary as the heater draws its combustion air from the
outside of the building, cupboard or compartment ventilation is not necessary providing that the
minimum clearances are maintained. However, reference should be made to BS 5440 Pt. 2.
IMPORTANT:
This appliance must be completely level. It MUST NOT lean in any direction.
Otherwise it will cause problems with the condense draining.
7.
HEATER COMPARTMENT CLEARANCES
(see BS 5864)
7.1
IMPORTANT
- If the heater is to be fitted to an existing base duct (warm air plenum), always
ensure when installing the appliance, the rear of the heater is aligned with the rear of the base
duct. If there is any overhang or blanking off, it will be at the front of the heater. In any event,
blanking plates must be mechanically secured and all joints sealed.
7.2
When the heater is fitted into a compartment, a minimum clearance from the compartment
walls of 3 mm (
1
/
8
”) at the sides, rear and front must be left. Where clearances are less than 75
mm, internal surface must be lined with non-combustible material and the compartment must
be of a fixed rigid structure. However, there is no requirement for the use of non-combustible
material at the front of the unit. Consideration should also be given to the space required for the
removal and replacement of the filter tray and the entry of the gas and electrical supplies. If gas
connections are made from a side entry, a minimum clearance of 75 mm (3”) is required at that
side.
7.3
For service access, a minimum of 450 mm (18”) is required at the front of the heater. Space must
also be allowed, in a compartment installation, to permit the removal of the heater.
7.4
In airing cupboard installations, the part used as the air heater 7.1 must comply with the relevant
section of BS 5864 and must be completely separated by either a non-combustible partition or
a perforated metal partition with the perforations not exceeding 13 mm (½”). The secondary flue
must be a tight fit where it passes through the partition and must be suitably protected (see BS
5440: Part 1).
7.5
In under-stairs installations, the compartment must comply with the relevant section of BS 5864,
provided that in addition all internal surfaces (including the base) are non-combustible or lined
with non-combustible material. This requirement is applicable only to dwellings of more than two
storeys.
7.6
In free-standing installations, (refer to the instructions packed with top closure kit), only one or
two walls will be in close proximity to the air heater; these must be non-combustible.
7.7
Where the air heater is to be installed onto a combustible surface and under-floor ducting used,
a suitable base tray MUST be used in order to provide insulation.
NOTE:
where a base plenum is used, no base tray is required!
7.8
Although two permanent ventilation openings are not required, consideration should be given
to the amount of heat emitted by any ductwork present in the compartment, otherwise the
compartment temperature could increase and will affect the safe operation of the appliance and
its controls.
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