Hoval 51-UltraGas 2 1000, Installation Instructions Manual

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MAINTENANCE
6. Maintenance
NOTICE
Damage to the system can result from failure
to perform cleaning and maintenance or in-
correct cleaning and maintenance.
• Have the heating plant inspected and
cleaned once per year.
• If necessary, have the plant serviced.
• To avoid damage to the heating plant, rem-
edy faults immediately!
6.1 Safety instructions
CAUTION
Cutting injuries as a result of sharp edges.
Handle sections of the cladding carefully and
avoid contact with sharp edges.
!
CAUTION
Risk of injury for non-expert personnel.
Maintenance and cleaning work are only al -
lowed to be performed by trained specialist
personnel or by Hoval customer service.
NOTICE
After repairs or replacements of boiler parts,
flue gas measurement must always be per -
formed as described in chapter 6.7.
WARNING
The heat generator must be de-energised for
maintenance.
Set the blocking switch to “0” and disconnect
the heat generator from the mains (e.g. main
switch).
WARNING
All electrical power supply circuits must be
switched off before accessing the terminals.
Perform reset, see operating instructions.
6.2 Deaeration
1. Open all radiator valves.
2. Heat up the plant for at least half a day with a high
flow temperature.
3. Switch boiler off and wait for 5 minutes.
4. Thoroughly bleed the system.
6.3 Top up with water
§
ÖNORM H5195, European Standard
EN 14868 and VDI Guideline 2035 must be
complied with (see chapter 5.3).
If the water pressure drops below 1 bar, a warn-
ing is output and the boiler output is reduced
to 50%. If the water pressure drops below 0.5
bar, the boiler automatically switches to lockout.
Replenish replacement water if the pressure drops below
the minimum system pressure:
1. Connect the filling hose to the water tap.
2. Deaerate the filling hose.
3. Connect the filling hose to the filling and drain valve.
4. Replenish replacement water (see chapter 5.2).
6.4 Renewing fuse
WARNING
Electrical installation must be performed by a
licensed electrician.
1. Set the blocking switch to “0” and disconnect the heat
generator from the mains (e.g. main switch, fuses).
2. Remove the front cladding according to the proce-
dure in chapter 4.8
3. Remove the protecting cover from TopTronic
®
E -
WEZ, press to the side and remove.
4. Renew fuse (T 10 A 250 V).
Fig. 43
5. Mount protecting cover and close cladding.
6. Restore the electrical power supply.