page no. 15 of 36
OUH Range Users, Installation & Servicing Instructions Doc Ref M105 issue 5.8 Apr 2020.
The air heater will be delivered to site pallet mounted and
protected by plastic sheeting.
Note: In order to achieve the desired
performance levels it is recommended that the
installation height (floor level to base of unit)
for OUH20 and OUH30 is between 2.5m and
3.0m, and OUH45 and OUH60 is between 3.0m and 5.0m.
Note: The minimum clearances must be
observed for installation and servicing.
Warning: Any combustible material adjacent
to the air heater and the flue system must
be so placed or shielded as to ensure that its
temperature does not exceed 65 °C.
Warning: When OUH modular components
are used in conjunction with the heater each
component must be individually supported.
If the heater is to be base mounted it may be stood
directly on the platform, provided it is of a suitable non-
combustible material and does not extend past the front
edge of the heater.
The air heater may be installed either:
a) Suspended by steel chains, rods or straps, dependent
on OUH model.
b) on specifically designed cantilever brackets from a non
combustible wall.
c) on a level noncombustible surface. The surface must
not extend past the front edge of OUH heaters.
The method of installation must be capable of adequately
supporting the weight of the unit (See section 1.2,) and
any ancillary equipment. Before installing the heater
the existing structure must be inspected to ensure it is
suitable. All supports should be protected against the
effects of rust or corrosion.
If noise levels are of particular importance, the heater
should be isolated from the structure of the building by
installing it on suitable anti-vibration mountings.
In all such cases, and in addition, when the heater is
suspended it is essential that all oil, duct, electrical and
flue connections to the heater are made with flexible
connections to maintain continuity of connection. In the
case of the flue connection single wall stainless steel flue
is deemed to flex sufficiently to meet the requirements.
Raise the heater up to the point of installation using
suitable and safe means and connect to the means of
suspension.
OUH/C and OUH/D models are designed for use with duct
work to more precisely define the point of air delivery,
and /or provide ducted return air or ducted fresh air inlet.
All ducting must be independently supported of the air
heater.
Joints and seams of supply ducts and fittings must be
securely fastened and made airtight. If required the
ductwork should be insulated to reduce heat loss.
Ducting should be connected to the heater spigots via
an airtight flexible coupling of non-combustible material.
Before fitting the coupling it must be ensured that a
minimum clearance of approximately 15mm will be
maintained between the ends of the ducting and the
heater spigots.
Sound attenuators may be fitted in inlet and outlet ducts
to reduce airborne fan noise. Materials used in outlet
sound attenuators must be capable of withstanding
100°C air temperature without any deterioration.
The room thermostat should be fitted at a point which
will be generally representative of the heated area as
far as temperature is concerned. Draughty areas, areas
subjected to direct heat e.g. from the sun, and areas
where the air movement is relatively stagnant e.g. in
recesses, are all positions to be avoided.
The thermostat should be mounted about 1.5m from the
floor.
Any room thermostat, frost thermostat, time clock etc.
must be suitable for switching 230V, 5A and must be of
the 'snap action' type to minimise contact bounce.
For electrical connections of external controls see section
2.5 or the accompanying wiring diagram.
The oil pipework length and diameter should be in
accordance with the information given in the burner
instruction booklet.
