6.0 Commissioning the Appliance
32
6.1
Commissioning the Appliance (Cont)
1. From the table opposite check that the main
burner pressure is correct after the appliance has
been running for 10 minutes.
2. Check for gas soundness, with main burner
alight, using leak detection fluid.
3. If necessary, adjustment to main burner
pressure can be made by altering the regulator as
shown (Fig. 82).
4. To alter the burner pressure, turn the adjustment
screw in either direction until the required pressure
is obtained.
5. Turn the boiler thermostat to the OFF position
marked 0. Screw home the pressure test point
screw. Turn the boiler thermostat knob to the
required setting.
6. The boiler and system should be run and then
flushed and treated in accordance with
BS 5793:1992 and the flushing agent / inhibitor
manufacturers instructions. When all the air has
been removed from the water circuit, the pump and
radiators should be balanced to achieve the design
temperature drop across the system.
7. Make a final check for gas soundness and set
any timer control, room thermostats etc. to the
customer's specific requirements.
8. The boiler is protected by an integral frost-stat,
but if the boiler is not to be used for a long period
of time, the system should be drained.
NOTE: The frost thermostat operates even if
the boiler thermostat is in the OFF position and
it is necessary therefore, if the system is
drained, for the external electrical and gas
supplies to be isolated.
It is recommended that a label be affixed to the
appliance to draw attention to the fact that the
system has been drained.
WARNING - If the system is filled with very cold
water and the boiler lit, the action of the frost
protection thermostat will prevent the boiler
from shutting down before the water
temperature reaches 10°C.
Model
Input
Setting Pressure
kW
Btu/h
mbar
in wg
30
Maximum
10.99
37, 500
16.0 + 0.5
6.4 + 0.2
Minimum
7.33
25, 000
8.0 + 0.5
3.2 + 0.2
40
Maximum
14.65
50, 000
16.0 + 0.5
6.4 + 0.2
Minimum
11.36
38, 750
10.0 + 0.5
4.0 + 0.2
50
Maximum
18.32
62, 500
16.0 + 0.5
6.4 + 0.2
Minimum
15.02
51, 250
11.5 + 0.5
4.4 + 0.2
60
Maximum
21.98
75, 000
16.0 + 0.5
6.4 + 0.2
Minimum
18.68
63, 750
11.5 + 0.5
4.4 + 0.2
70
Maximum
25.64
87, 500
16.0 + 0.5
6.4 + 0.2
Minimum
22.35
76, 250
12.16 + 0.5 4.8 + 0.2
80
Maximum
29.31
100, 000
16.0 + 0.5
6.4 + 0.2
Minimum
22.35
76, 250
9.5 + 0.5
3.8 + 0.2
Burner Pressure
Test Point
Regulator
Fig. 82
