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MAINTENANCE
6.6
Cleaning and maintaining the gas boiler
The boiler is only allowed to be cleaned and
maintained by a licensed specialist or Hoval
customer service technician.
The Hoval gas boiler must be cleaned and serviced at
least 1x a year.
NOTICE
If the Hoval gas boiler was in operation dur-
ing the building phase, it is essential to check
the degree of contamination. Clean in the
case of heavy dirt build-up.
Ring spanner, screwdriver, open-end span-
ner, vacuum cleaner, compressed air, spray
bottle, water, fine sandpaper, long-nosed pli
-
ers, blowtorch
1. Before cleaning while the heat generator is in opera-
tion, carry out the following tasks:
- If a neutralisation unit is present, check its function ac-
cording to the manufacturer’s operating instructions:
-
Check the neutralising effect of the neutralising
agent in the neutralisation unit (measure the pH
value of the condensate after it has passed through
the neutralisation unit. A pH value ≥ 6.5 is OK).
- Functional check of all electrically operated com-
ponents of the neutralisation unit/condensate pump
combination (if present).
2. Set the blocking switch to “0” and disconnect the heat
generator from the mains (e.g. main switch, fuses).
3. Close main gas valve.
4. Set up the climbing aid and remove the upper section
of the cladding (see chapter 2.4, steps 1 to 7).
5. Undo all burner plug-in connections.
6. Remove the supply air connection from the Venturi
tube of the burner, if present.
7. Disconnect gas connection from the gas valves.
!
Bracing
Fig. 44
8. Opening combustion chamber:
- Unscrew palm grips.
- Swivel the burner upwards, with the boiler door
!
CAUTION
UltraGas
®
2 (190 - 1550):
If a gas pressure spring is weakened, the
boiler door is lowered. There is an increased
danger of injury when reopening the boiler
door.
• In such cases, replace both gas pressure
springs.
Fig. 45
9.
Check burner cylinder web.
- The burner cylinder must be cleaned if visible contam-
ination exists (such as deposits, e.g. builder’s dust).
- If the burner cylinder web is damaged or there are cracks
in the welds, the burner cylinder must be replaced.
Summary of Contents for 51-UltraGas 2 1000
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