27
Turn on main electricity supply.
Light burner by turning thermostat knob to high
setting (fully clockwise).
Check pressure after 10 minutes. Adjust if necessary to
the relevant figures for the corresponding model shown
in the chart below.
To set the main burner pressure adjust the throttle as
shown. To increase the burner pressure, turn the
adjustment screw in either direction until the required
pressure is obtained.
Set any timer control, room thermostats etc to the
customer's specific requirements.
Turn the boiler thermostat knob to the OFF
position marked O. Screw home the pressure
test point screw. Turn the boiler thermostat knob
to the required setting. Make a final check for gas
soundness of all gas carrying joints on boiler.
Check operation of flame failure device. Turn gas
control knob clockwise in the direction marked O. The
control knob cannot be depressed until ignition restart
interlock device in gas valve has disengaged. This
takes 60 seconds approximately. Pilot must not be relit
for 3 minutes after shut down.
The appliance is fitted with a pump overrun timer which
keeps the pump running (fully pumped systems only),
when any external control switches the appliance off.
To check the operation of this, turn programmer,time
switch off, the pump should continue to run for
approximately 3 minutes and then stop.
The boiler and system should be run and then flushed
and treated in accordance with BS7593: 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. Recheck for water leaks.
Carefully read and complete all sections of the
“Benchmark” Installation, Commissioning and Service
Record Log Book that are relevant to the appliance and
installation. The details of the Log Book will be required
in the event of any warranty work. The Log Book must
be handed to the user for safe keeping and each
subsequent regular service visit recorded.
Model
Input
Setting Pressure
kW
Btu/h
mbar
in wg
Maximum
11.00
37,500
15.4 + 0.5
6.2 + 0.2
30
Minimum
7.69
26,250
8.0 + 0.5
3.2 + 0.2
Maximum
14.65
50,000
16.3 + 0.5
6.5 + 0.2
40
Minimum
11.36
38,750
10.3 + 0.5
4.1 + 0.2
Maximum
18.32
62,500
16.3 + 0.5
6.5 + 0.2
50
Minimum
15.02
51,250
11.2 + 0.5
4.5 + 0.2
Maximum
21.98
75,000
16.0 + 0.5
6.4 + 0.2
60
Minimum
18.68
63,750
12.0 + 0.5
4.8 + 0.2
