BENSON MH300, User Instructions

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Alternatively, the static pressure should be
measured at the start of the ductwork to
confirm that it is within the permissible
tolerance.
(b) If the current drawn is greater than the
stated running current, in most probability this
will be caused by insufficient static pressure
within the ductwork, in which case system
resistance should be increased through the
introduction of a damper placed as close to the
start of the ductwork as possible, thereby
resulting in a reduction in drawn current.
The damper should be adjusted until the
current is in accordance with that stated on the
data plate.
(c) If the current drawn is too low the duct
outlet grilles will require opening to reduce
static pressure and increase air volume, if this
is not the case overheat cut outs can be
caused.
4.4 Commissioning - hand over
(a) Upon full and satisfactory completion of
commissioning, a record of commissioning
information
(contact, date, etc) should be left with the
heater, a copy of which must also be
forwarded to Benson Heating Service
Department.
(b) The commissioning engineer must ensure
that the user is familiar with the safe and
efficient use of the heater, detailing the
function of all controls, and main components.
(c) The user should be made aware of the
following in particular
(i) Lighting, shutdown, and operational
information.
(ii) Safety features, data plate, and labelling.
(iii) The requirement for regular inspection -
especially if the heater is within a more
demanding environment - and the need for
regular servicing carried out by competent and
qualified persons.
Caution
After approximately 100 hours of running, the
tension of the fan belts must be checked to
ensure that they are correct and that they have
not stretched. See section 5.2 for further
instructions.
5.0 Servicing
Warning
Servicing must be carried out on a regular
basis, the maximum interval between services
being 1 year. It is a requirement that only
suitably qualified and competent persons are
allowed to undertake servicing.
Before any maintenance or servicing work
is carried out the heater must be shut down
and allowed to cool, and have the oil and
electric supplies to it turned off at the
supply valve and isolator respectively.
Caution
Certain component parts are factory sealed
and are designed so as to be tamper proof.
Usually such items do not require servicing,
and therefore should not be tampered with.
Failure to comply with this can invalidate any
warranty, and can also lead to premature
failure.
The following parts fall within this category:
thermostat, fan and motor.
Additionally, the fan and limit stat has been
factory set, and must not be re-set without
formal consent from the manufacturer.
Reference should be made to the separate
information covering the operational details of
the burner .
Only approved spare/replacement parts can
be fitted, failure to comply with this can
compromise the safe and efficient running
of the heater, and can also invalidate any
warranty claim.
5.1 Planned Servicing
In order to maintain the efficient operation of
the heater it is recommended that the following
planned servicing and preventative