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Each heater supply must be fitted with a
separate isolating cock positioned adjacent
to and upstream of the union which must be
sited outside the heater.
The isolating cock should be of the 90
0
turn
type and should be clearly marked
OPEN /
CLOSED
it should also be installed so as
to fall to the closed position.
An approved gas jointing compound must
be used on all joints and unions and the
system purged and tested for soundness
prior to final connection.
The connection to the heater can be made
by way of either an approved flexible
coupling or rigid connection. Threaded
connections must comply to ISO 288/1 or
ISO 7/1 further information concerning
accepted European practice is detailed in
BS EN1020.
The diameter of the pipework from the
isolating cock to the burner must not be less
than the diameter of the connection into the
multiblock.
Note
Reference to The Institute of Gas Engineers
publications Utilisation Procedures IGE/UP1
and IGE/UP2 together with reference to
BS6891 is strongly advised.
3.0 Commissioning
Note
It is a requirement that only suitably
qualified and competent personnel are
allowed to undertake the commissioning
of the heater.
It is also strongly recommended that
prior to commissioning the engineers
familiarises themselves with the heater.
the specific requirements of the
installation / application, and the
information contained within the manual.
Warning
All heaters are subject to a rigorous test
programme prior to despatch, whilst such a
programme does involve pre-commissioning
and the setting of the heater to operate
efficiently and within its designed
operational limits this does not mean that
the function of thorough on site
commissioning is less important.
It is strongly recommended that the
equipment used for the sampling and
analysis of the flue gases is accurate to
/- 0.1% and maintained so that it is
regularly calibrated.
The following pre-commissioning checks
should be undertaken, having first ensured
that the gas and electrical supplies are
turned off.
(a) Check that all panels and fasteners are
secure and in place.
(b) Check that the heater is mounted safely.
(c) Check that the flue is sealed, secured,
and adequately supported.
(d) Check that the fan is free to rotate, that
the fan is secured to its shaft, and that the
guards and fan assembly are all in place
and properly secured.
(e) Check that the heater is installed so that
it is not tilted and remains square.
(f) Check that the outlet louvres (Axial
heaters) are set to offer minimum resistance
to air flow.
3.1 Electrical pre-tests
The electrical safety checks must include
the following
