Installation shall be in accordance with the current editions of:-
Building Standards (Scotland) (Consolidation) Regulations
Building Regulations
Gas Safety (Installation and Use) Regulations (as amended)
BS 7671 Institute of Electrical Engineers (I.E.E.) Wiring Regulations
BS 5482 Pt. 1 Domestic Butane- and Propane-gas-burning installations.
BS 5440 Pt. 1 (Flues for Gas Appliances)
BS 5440 Pt. 2 (Air Supply for Gas Appliances)
BS 5864 Installation of Gas Fired Ducted Air Heaters
British System Design Manual “Gas Fired Warm Air Heating”
Model and Local Authority Bye-laws
BS 5546 Installation of Domestic Hot Water Supplies.
IMPORTANT: STATUTE LAW DEFINES THAT ALL GAS APPLIANCES MUST BE INSTALLED BY COMPETENT PER-
SONS, (i.e. CORGI REGISTERED INSTALLERS) IN ACCORDANCE WITH THE GAS SAFETY (INSTALLATION AND
USE) REGULATIONS (CURRENT EDITION). FAILURE TO COMPLY WITH THESE REGULATIONS MAY LEAD TO
PROSECUTION.
2.
HEATER COMPARTMENT AND CLEARANCES
(See BS 5864)
2.1
IMPORTANT:
If the heater is to be fitted to an existing base duct (warm air plenum), always ensure that installation is
carried out such that the rear left hand corner of the heater is aligned with the rear left hand corner of the base duct, so
that any overhang or blanking off will be at the front and/or right hand side. In any event, blanking plates must be
mechanically secured and all joints sealed.
2.2
When the heater is fitted into a compartment, a minimum clearance from the compartment walls of 3mm at the
sides and rear, and 75mm (3 in) at the front must be left. Consideration should also be given to the space required for the
removal and replacement of the filter tray and the entry of the gas, water and electrical supplies. If gas and /or water
connections are made from a side entry, a minimum clearance of 75mm is required at that side.
2.3
For service access, a minimum of 450mm (18ins) is required at the front of the heater. Space must also be allowed, in a
compartment installation, to permit the removal of the heater. The clearance between the appliance and the compartment
should be not less than 75mm (3 in). However, if clearances are less than 75mm, the internal surface of the compartment
must be lined with non-combustible material. The compartment must be of a fixed rigid structure.
2.4
In airing cupboard installations, the part used as the air heater compartment must comply with the relevant section of
BS5864 and must be completely separated by either a non-combustible partition or a perforated metal partition with the
perforations not exceeding 13mm (1/2in). The secondary flue must be a tight fit where it passes through the partition and
must be suitably protected (see BS5440:Part 1).
2.5
In free-standing installations, (see instructions packed with TC32 or TC32R Top Closure Kit), only one or two walls will be in
close proximity to the air heater; these must be non-combustible.
2.6
If the Air Heater is to be installed onto a combustible surface, a suitable base tray is required (BT32 for J32 model
appliances) is required. However, when a base duct is used, this provides sufficient protection for combustible material and
no further insulation is required.
2.7
For Slot Fix applications (see instructions packed with the Slot Fix Kit), it is important to ensure that the draught diverter
relief is maintained on both sides of the application.
3.
VENTILATION AND COMBUSTION AIR
3.1
The room or internal space in which the heater is installed requires a permanent air vent of minimum effective area
41cm
2
(6in
2
). The air vent should be either direct to outside air or to an adjacent room or internal space (other than a
toilet or bathroom) that itself has an equivalent air vent direct to outside.
3.2
Combustion air may be introduced, via a 100mm (4in) nominal bore pipe, connected to a return air duct or plenum from
a ventilated area and fitted with a lockable damper. The damper should be adjusted to control combustion airflow to
0.0099m
3
/s (21cfm), (i.e. 1.26m/s [250ft/min] velocity in a 100mm [4in] bore pipe). If this arrangement is used, a non-
closeable warm air register MUST be provided in the same area as the front of the air heater or heater compartment if a
return air grille is not located in that area.
3.3
When installed in a compartment, two permanent ventilation openings into the compartment are required, one at high
level and one at low level, both communicating either directly with outside air or with a ventilated room or space. The
minimum effective areas specified in Table 1 are related to the rated heat input of the Air Heater, and assuming that a
HIJAN 6P circulator is fitted.
3.4
If any room or area from which air is drawn for ventilation or combustion contains an extract fan, the permanent vents
must be sized to ensure that the operation of the appliance(s) at full rate is/are not adversely affected. A spillage test as
specified in sub-para 6.8 (Safety Checks) is carried out and any remedial work undertaken.
2
Fig. 7, PRINCIPAL DIMENSIONS (mm)
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