Owner manual
40
12 Commissioning
Additionally the safe nominal maximum heat input of the
appliance can be achieved at an inlet pressure down to
15mbar.
NOTE:
The BURNER PRESSURE cannot be measured.
Gas Rate
Make sure that ALL other gas burning appliances and pilot
lights are off.
Check the gas rate using the gas meter test dial and stop
watch, at least 10 minutes after the burner has lit.
The approximate maximum gas rates are:
12.7 Heating System
Ensure that the external controls are calling for heat.
Fully open all radiator valves, ow control valve and bypass
valve if tted.
Balance the radiators as required and if tted adjust ow
control valve to give the required system differential. Turn off
all radiators that can be shut off by the user and check to see
if less than the maximum differential allowed of 20
0
C can be
achieved across ow and return.
NOTE: Allow the system to reach maximum temperature then
switch off the boiler by isolating from the electrical supply.
Drain the entire system rapidly whilst hot, using the drain tap
at the lowest part of the system. Fill and vent the system as
described previously in section 12.2
Lock or remove the handle from controls valve, if tted.
Adjust the boiler temperature controls and any system
controls to their required settings.
12.8 Completion
Ensure that the magnetic lighting instruction label is placed on
the surface of the boiler casing.
GB: It is a requirement that the “Benchmark” Installation
Commissioning and Service Record is completed and left wth
the user.
IE: it is necessary to complete a “Declaration of Conformity” to
indicate compliance to I.S.813. An example of this is given in
the current edition of I.S.813.
12.9 Instruct the User
● Demonstrate, then instruct the User about the lighting
procedure and heating system controls operation.
● Advise that to ensure the continued efcient and safe
operation of the boiler it is recommended that it is checked
and serviced at regular intervals. The frequency of servicing
will depend upon the installation conditions and usage, but in
general, once a year should be enough.
● Draw attention, if applicable, to the current issue of the Gas
Safety (Installation and Use) Regulations, Section 35, which
imposes a duty of care on all persons who let out any property
containing a gas appliance in the UK.
● The user shall not interfere with or adjust sealed
components.
● It is the Law that any servicing is carried out by a
competent person approved at the time by the Health and
Safety Executive.
● Advise the user that, like all condensing boilers this
appliance will produce a plume of condensation from the ue
terminal in cool weather. This is due to the high efciency and
hence low ue gas temperature of the boiler.
● Advise the user of the precautions necessary to prevent
damage to the system, boiler and the building, in the event of
the heating system being out of use during frost or freezing
conditions.
● Advise the user that the permanent mains electrical supply
SHOULD NOT be switched off, as the built in frost protection
and pump saver program will not operate.
● Advise the User if the mains electricity and gas are to be
turned off for any long periods during severe weather, it is
recommended that the whole system, including the boiler,
should be drained to avoid the risk of freezing.
NOTE: Sealed System: Contact your installation/servicing
company as draining, relling and pressurising MUST be
carried out by a competent person approved at the time by
the Health and Safety Executive.
● Leave these instructions and the ‘Benchmark’ Installation,
Commissioning and Service Record with the user.
kW m3/hr ft3/hr kW m3/hr ft3/hr
35 3.7 131 22 2.3 81.2
34 3.6 127 21 2.2 77.7
33 3.5 124 20 2.1 74.2
32 3.4 120 19 2.0 70.6
31 3.3 117 18 1.9 67.1
30 3.2 113 17 1.8 63.6
29 3.1 109.5 16 1.7 60.0
28 3.0 106 15 1.6 56.5
27 2.9 102.4 14 1.5 53.0
26 2.8 98.9 13 1.4 49.5
25 2.6 91.8 12 1.3 45.9
24 2.5 88.3 11 1.2 42.4
23 2.4 84.8 10 1.12 38.9
14249
APPROXIMATE GAS RATES
MODEL NATURAL GAS G20
m3/h ft3/h
12hx 1.28 45
15hx 1.60 56.5
18hx 1.93 68
24hx 2.58 91
30hx 3.26 115
35hx 3.8 134
12.6 Range Rating
The boilers are fully modulating, therefore it is not necessary
to range rate them, however, if desired, you can adjust the
boiler in 1kW increments between 10 and maximun output of
your appliance, as follows:
a) Press and hold the ‘MODE’ and “+” button for 5
seconds. The display will change to ashing ‘0’.
b) Use the ‘+’ or ‘-’ button to scroll to 96.
c) Press and hold ‘MODE’ 5 seconds to conrm.
d) The display now shows a ashing ‘d. 0’.
e) The part load setting is displayed in kW.
Press ‘MODE’ the max rate will be indicated, to
change the value to the desired setting, use the ‘+’
or ‘-’ button.
f) Press ‘MODE’ for 5 sec to conrm the new setting
has been saved.
g) Press and hold ‘MODE’ and “+” to exit.