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7.0 Routine servicing
The appliance shall always be turned off by removing any heat demands.
Before working on the appliance ensure that the head temperature is below 150 °C. This is to
prevent any uncontrolled engine start which would constitute a hazardous situation and/or
possible damage to the engine.
The engine head temperature can be found on the Fascia Controller, by following the procedure
below;
1. Press 'OK' button
2. Then press 'I' button (between 1 and 3 seconds)
3. Select 'Engineer Level' using the setting knob and press '0K'
4. Select 'Input/Output test' and press '0K'
S. Select 'Head Control Temperature' and read temperature from display and note value
6. Confirm head temperature by selecting 'Head Unit Temperature' and read temperature from
display and note value
7. Both readings should be within 50° C of each other
To ensure continued efficient operation of the product, it is recommended that it is checked and
serviced as necessary at regular intervals. The frequency of servicing will depend upon the
particular installation conditions and usage, but In general once a year should be adequate. Any
service work must be carried out by qualified KD NAVIEN trained personnel only.
The product incorporates a flue sampling point on top of the appliance. Do not forget to replace
the screwed cap after use.
Refer to the Installation Manual for cover removal and replacement procedures.
Before commencing any internal service operation, ISOLATE the mains electrical supply, and
TURN OFF the gas supply at the main service cock.
Service the appliance by following the procedure detailed below:
Electrical capacitors can remain charged for long periods after disconnection from the
mains supply. Extreme caution must be exercised at all times when working on this
product.
When servicing the controls enclosure, before removing the cover, ensure a 5
minute waiting time is allowed for the enclosed capacitors to discharge.
7.1 Gas Emissions
1) Before carrying out any testing on the appliance ensure that a gas soundness test on the
installation is carried out.
2) Check each burner individually, see below;
7.2 Chimney Sweep Function
See section 5.5.2.
Navien stirling engine m-CHP installation manual
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