Unical AIREX 25 2S, Installation And Servicing Manual

Page: 34 / 40

34
Servicing schedule
To ensure the continued safe and efficient
operation of the boiler it is highly
recommended that it is checked at regular
intervals and serviced when necessary, and
that only original spare parts are used.
Regular attention will prolong the boiler’s life
span.
If the boiler is not checked and serviced
regularly it could cause material and
personal damages.
For this reason UNICAL recommends that a servicing contract
should be made with one of our authorized After Sales Service
Assistance Centre.
The boiler must have regular maintenance and cleaning in order
to ensure reliable and efficient operation. Regular attention
will prolong the boiler’s life span.
The frequency of servicing will be determined by the service
engineer and will depend on the appliance’s state of condition.
To ensure reliable and efficient boiler operation please refer to
the table on page 37 where the “recommended servicing and
maintenance operations” are indicated.
INSTRUCTIONS FOR INSPECTION AND SERVICING
To ensure a long life to all your boiler
components and in order not to alter the
conditions of the approved product, only
original UNICAL spare parts must be used.
Before servicing always carry out the following steps:
- Disconnect the mains electricity supply.
- Separate the appliance from the electrical supply by means
of a separating device with an opening contact of at least 3
mm (for example safety devices or power switches) and
ensure yourself that it cannot be accidentally reinserted.
- Close the on-off gas cock fitted upstream of the back up
boiler.
- Close any on-off valves fitted on the CH flow and return
pipes, as well as the cold water inlet valve.
Once all the necessary maintenance work has been
completed always follow these steps:
- Open the CH flow and return valves as well as the cold
water inlet valve
- Purge the boiler and, if necessary, restore the heating
system’s pressure.
- Open the back up boiler’s on-off gas cock.
- Switch on the electrical supply to the boiler.
- Test for gas soundness, on the gas side (auxiliary boiler
with gas burner) and on the water side.
SERVICING & MAINTENANCE
SCHEDULE
5