BENSON OLYMPIC WH - Air Distribution System; Hand over

(j) Repeat steps 4.2 c,a,
(k) Re-check all connections
and joints for gas soundness using an approved leak detection fluid.
(1) Remove burner cover and attach manometers to check burner pressure settings.
(m)
Repeat steps 4.2 d,e,f, allowing the heater to reach thermal equilibrium.
(n) Check burner pressure settings are in line with the data as per section 8.1 (if adjustment is
necessary refer to separate burner information within section B).
Note (i)
The figures quoted in section B are independent test figures based upon zero flue resistance.
(0) Adjust room thermostat to its highest setting, and allow the heater to continue to fire.
(p)
Gradually reduce the temperature setting on the room thermostat until the burner shuts down,
and then gradually increase the temperature setting on the thermostat until heat is called for,
and the burner automatically re-fires.
(q) Re-set
time clock to a minimum off period, checking that the burner shuts down, and then
automatically re-lights once the minimum off period has elapsed. (Separate information on the
time clock is contained within section B of the information package).
(r)
Check fan and limit stat by depressing and holding in the fan motor overload re-set button,
located on the heater electrical panel. The time between the fan stopping and burner shut
down should be noted, once the burner has shut down the overload on the motor should be
released. If the time interval between fan stop and burner shut down is greater t han 3 minutes
further checks should be made. These are as follows
(i) Check settings on fan and limit stat are correct, ie, fan on 60 °C, fan off 30 ° e, limit lOO ° e.
(ii) Check that the position of the unit is correct, ie, equi-distant between heat exchanger
body and heat shield panel.
(iii) Check integrity of unit , ensuring that neither the bi-metalic strip nor its casing is damaged.
(s) Undertake flue gas analysis using approved and calibrate d analysing equipment recording
data on the commissioning card, ie, CO, C0 2, net and gross flue temperatures. Record mains
gas pressure, burner head pressure, ambient temperature, barometric pressure, etc, and
complete percentage efficiency calculation, using the formula detailed in section 8.
Note (ii)
The burner air and gas pressure settings should be only very finely adjusted to achieve a C0 2
reading of 9.3% (+ / - 0.1 %) and 8.7% on WH 375 only. See also Note (i) above.
Note (iii)
The net efficiency level must not be } ower than 79 % for heaters fitted with a modulating or a
high / low burner. In other cases the net efficiency level must not be lower than 84%.
Note (iv)
All Cabinet Heaters are test fired and pre-commissioned as part of the manufacturing process , if
however, during on site commi s sioning the data are found to be not in accordance with the
manufacturers data, then the following action is recommended.
* Re-check all readings and calculations.
* Adjust burner as per manufacturers instructions.
* Consult Benson Environmental Ltd Technical Department.
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