Checks - BENSON RS UHA Assembly And Use Manual

To ensure that the heater is working correctly certain
criteria need to be checked. Start up heater and check
the following

Check that the fan starts approximately 30 seconds
after ignition of the burner.
When the heater is at its full efficiency after about 20
minutes the following checks should be made
Check that the horizontal fins are correctly set so as to
give the optimum heating performance and the air flow
is sufficient to cool the heat exchanger. Ensure where
vertical fins are installed they are also open and not
restricting the air flow.

Check that there are no gas leaks

Check that the gas rate is correct using a meter.
WARNING!
It is a requirement that only qualified personnel are
allowed to carry out installation commissioning or
servicing.
Before commencing any maintenance or servicing work
the heater must be shut down and allowed to cool, and
have the gas and electric supplies to it turned off at the
supply cock and isolator respectively.
COMBUSTION PRODUCT SAMPLING
1. Flue gas sampling point.
2. Combustion air sampling point.

CLEANING THE FLUE DISCHARGE AND AIR
INTAKE PIPES
The cleaning of the flue and air intake pipes consists of
the removal of any dust and debris inside the pipes.

CLEANING THE FAN
The cleaning of the fan assembly consists of clearing
any dust or debris from the fan blades, motor, and
protective guard.

FLUE VENTER CLEANING
The cleaning of the flue venter consists of the cleaning
of dust from the fan blades.

LIMIT THERMOSTAT
Check the limit thermostat operation once a year by
removing the TEST link and checking that the burner
has extinguished.

CHECKS

MAINTENANCE
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200
4
35

Check injector pressure is correct.

Check temperature rise is correct to data plate.

Check the operation of the control and limit
thermostats TR, SND, LM.

Check that the room thermostat operates the burner
not the fan.

Check that the motor absorption is not more than
stated on data plate.

Check that the flue venter and axial fan are working
correctly.

Check that the fan runs on 3–4 minutes after the
burner has shut down.

Check output corresponds to that on the data plate.

Check that there is no condensate in the flue
gasses.
In order to carry out analyses of the Flue gasses
sample points must be made at the following
dimensions See Diagram.
100

BURNER BAR CLEANING
The burner bar should be removed from its housing and
the tube(s) should be cleaned with a brass wire brush
and any dust or debris blown clear with a compressed
air gun. Any tubes gaskets or seals that are damaged
should be replaced.

AIR FLOW FINS
Ensure that the horizontal fins are set so as to evenly
distribute the air in the area to be heated they should
opened to a minimum of 45 degrees this will ensure that
there is sufficient air flow over the combustion chamber
and avoid nuisance over heat lockout .For this reason it
is also important to ensure that the vertical louvres if
fitted are also open and clean.
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