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54
EcoBlue System
7219708 - 01 (04/15)
10
Maintenance
Expansion Vessel Charge
- 1.0 bar
13. To check the charge accurately ensure the system is cold.
It is also necessary to relieve the pressure by draining the
boiler. Using a suitable gauge check the pressure at the valve
on the underside of the vessel (12 - 15 - 18 - 24 - 28 models)
or on the top left of the boiler (32 model). Adjust the pressure as
required and repressurise the system.
A right angled valve extension will aid checking and
repressurising (12 - 15 - 18 - 24 - 28 models).
17. Check the operation of the Safety Pressure Relief Valve.
Simulate ‘Flame Failure’ fault by isolating the supply at gas cock
and operating the boiler. 133 should be displayed.
18. Reassemble the appliance in reverse order, ensuring the
front case panel is securely fitted. Recommission the boiler.
19. Complete the relevant Service Interval Record section of the
Benchmark Commissioning Checklist at the rear of this
publication and then hand it back to the user.
Control Box
removed for clarity
Fig. 47
Fig. 48
10.3 Specific Maintenance Operations
Changing Components
See Section 10.2 paragraph 2 for removal of case panel door
etc.
10.3.1 Spark Ignition & Flame Sensing Electrodes
1. Note their position and disconnect the electrode leads
2. Remove the retaining screws securing each of the electrodes
to the combustion box cover and remove the electrodes, noting
their orientation.
3. Check the condition of the sealing gaskets and replace if
necessary. Reassemble in reverse order (Fig. 49).
4. If satisfactory combustion readings are not obtained ensure
the electrode position is correct and perform the combustion
check again.
WARNING
When changing components ensure that both the
gas and electrical supplies to the boiler are isolated
before any work is started. When the component has
been changed recommission the boiler as described
in Section 7.
Always examine any seals or gaskets, replacing
where necessary. The Case Front Panel MUST seal
effectively against the boiler side panels.
Spark Ignition
Electrode
Flame Sensing
Electrode
Electrode
Leads
Vessel Valve
(12 - 15 - 18 - 24 - 28 models)
Vessel Valve
(32 models)
Fig. 49
Sealing
Gasket
Sealing
Gasket