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39
12 Commissioning
12.8 Heating System
Ensure that the external controls and programmer are calling
for heat.
Fully open all radiator valves, flow control valve, if fitted, see
diagram 5.1.
Press the “MODE” button to change to the CH.
Balance the radiators as r
equired and if fitted adjust valve
to give the required system dif
ferential. 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
o
C can be achieved
across flow and return.
NOTE: Should the system require that the appliance has to
be adjusted, the front casing will need to be removed as
described in the servicing section 13 and the control box
lowered into its service position.
The appliance pump has two speeds and can be adjusted to
suit the r
equirements of the system.
The appliance has an inbuilt automatic adjustable bypass
valve. The pr
essure can be adjusted between approx 1.5
and 3.5mH
2O but is factory pre-set to approx 2.5mH2O.
The pressure changes by approx 0.1mH
2O for each full turn
of the bypass screw, see diagram 12.3. Turning clockwise
increases the pressure and turning anti-clockwise decreases
the pressure.
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 taps
at all the low points of the system. Fill and vent the system
as described pr
eviously in section 12.3.
Lock or remove the handle from control valve, if fitted.
Adjust the boiler temperature contr
ols and any system
controls to their required settings.
12.9 Completion
Fit the base coverplate, see diagram 12.4.
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
with 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 curr
ent edition of I.S.813.
12.10 Instruct the User
Demonstrate, then instruct the User about the lighting
procedure and heating system controls operation.
Advise the user on the use and maintenance of any scale
reducer and pass on any relevant instructional documents.
Advise that to ensure the continued efficient and safe
operation of the boiler it is recommended that it is checked
and serviced at regular intervals. The fr
equency 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 curr
ent 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.
Diagram 12.4
Diagram 12.3
Advise the user that, like all condensing boilers this appliance
will produce a plume of condensation from the flue terminal in
cool weather. This is due to the high efficiency and hence low
flue 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 pr
otection
and pump/valve saver program will not operate.
Advise the User if the mains electricity and gas are to be
tur
ned 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: Contact your installation/servicing company as
draining, r
efilling and pressurising MUST be carried out by a
competent person.
Leave these instructions and the ‘Benchmark’ Installation,
Commissioning and Service Record with the user.
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