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Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Service
1. Insert and tighten new gaskets at all detached
on-site connections.
2. Open gas shut-off valve.
3. Check sealing points at input side of the combination
gas valve for leakage.
4. Put boiler into operation (see page 81).
5. Check output-side sealing points of combination gas
valve, sealing points between fan and burner plate
and sealing points between fan and Venturi-tube for
leakage.
Checking On-site Gas Connections for Leakage
WARNING
Risk of explosion due to gas leakage. Check for gas
leakage at the gauge connections.
CAUTION
Use of leak detection spray can lead to operational
malfunctioning. Leak detection spray must not come
into contact with electrical contacts.
Taking Final Measurement Reading
1. Take CO
2
measurement reading after each burner
dismantling in accordance with the items beginning
from pages 79 and 80.
2. Record measurement readings in record on page 219.
Checking the Water Conditions
Total output (MBH) Total Hardness (ppm of CaCO
3
)
> 1 Total
680
200
> 680 to
2050
150
> 2050
2
Water Quality
The lifetime of the entire heating system is influenced by
the water quality. A water treatment system will protect
against damages caused by corrosion and lime formation.
Hard water conditions (i.e. calcium carbonate) must be
avoided as it will cause deposits to accumulate on the
heat exchanger surfaces.
If in any doubt about the water quality, please have a
proper water analysis done. Check with regional chemical
suppliers for boiler water treatment or with Viessmann
Manufacturing Company Inc. directly.
The pH value of the heating water should be between 8.2
and 9.5
