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Flush & refill the system
1. Examine the system for water leaks and drain
the system whilst still hot.
2. Re-fill (using a suitable inhibitor) and vent the
system making a final check for leaks. On
Sealed Systems fill until the pressure gauge
registers 1.5 bar.
Set the system bypass
1. The by-pass valve should be adjusted so as to
maintain sufficient water flow through the boiler
to ensure that the overheat thermostat does
not operate under normal system conditions.
3.2 Final Adjustments
Control Thermostat
At its minimum and maximum settings, the
thermostat should control the water flow
temperature at approximately 55°C - 82°C.
Pilot Burner
The pilot is pre-set and no adjustment is
required. When lit the pilot flame envelope
should just cover the electrode tip. If the pilot
flame is not as described, replace as covered
in Section 4.6 - Servicing & Replacement of
Parts.
Fig. 23
Overheat Thermostat
The overheat thermostat is pre-set and no
adjustment is possible. It will require manual
re-setting if an overheat condition occurs (the
Red LED will be illluminated).
The re-set button is located on the controls
assembly, repeated shutdown by this device
should be investigated further and the fault
eliminated.
Products Discharge Safety Device (TTB)
CFL Only
This component is pre-set - no adjustment is
possible. In the case of flue blockage this
device will operate and the boiler will go to
24 Service & Replacement of Parts
lockout (The red LED will be illuminated). The
reset button is located on the controls
assembly, repeated shutdown by this device
should be investigated further and any fault
eliminated.
Other Boiler Controls
No further setting or checking is necessary as
all boiler mounted controls are designed so
that if a fault should occur they will fail safe.
External Controls
Check that any other external controls
connected in the system, such as clocks or
thermostats are correctly set and control the
boiler as required.
3.3 Advise the User
On completion of the installation, the installer
should demonstrate the operation of the boiler
and its associated controls. Also hand over all
the instructions.
1. If a programmer is fitted, ensure it is set as
shown in the instructions supplied with it.
2. Advise the user of the precautions
necessary to prevent damage to the system
and to the building in the event of the
system remaining inoperative during frost
conditions.
3. Advise the User that for continued efficient
and safe operation of the boiler it is
important that adequate servicing is carried
out at least once a year.
3.4 Installation Documentation
1. Leave a wiring diagram of the external
control circuit.
2. 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.
3. For IE, it is necessary to complete a
"Declaration of Conformity" to indicate
compliance to I.S. 813. An example of this is
given in I.S. 813 "Domestic Gas
Installations". In addition it is necessary to
complete the "Benchmark" Log Book.
Publication No. 5102977
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