Baxi LUNA HT 1.280, Installation, Operation And Maintenance Manual

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4.3 Corrosion protection
Caution! Risk of damage of the device!
Before operation the system must be thoroughly flushed and re-filled with cold
water. The pH of filling water must be between 7.0 and 8.3. The pH value can
change based on CO
2
formation in connection with the calcium loss during system
operation. This must be inspected in the yearly service however, in known hard
water areas this may need to be more frequently i.e. 6 monthly, 3 monthly etc.
For systems with under floor heating and pipe work which is not oxygen-tight, sys-
tem separation from the boiler and other corrosion endangered components must
be installed i.e. a heat exchanger.
4.4 Requirements for heating
circuit water
To ensure economical operation and keep the heat exchanger in serviceable condi-
tion it may be necessary to treat the filling water with additives. If the water hard-
ness is greater than 17.5 degrees Clarke or 259mg/litre of Calcium then, this must
be treated. This depends on the total water hardness, system volume and the size
of the boiler.
If, in a special case, a need exists to use additives in a mixture (e.g. hardness stabil-
ser, frost protecion agent, sealing agent,etc.) it has to be observed that the agents
are compatible with each other and the pH-value is not altered. Preferably, agents
from the same manufacturer should be used.
The instructions of the additive manufacturer have to be observed.
Released additives
Currently, the following agents have been approved by BAXI:
- “Full heating protection“ from Fernox
- “Sentinel 100“ from GE Betz
As a single frost protection agent, also Tyfocor® L may be used.
If not approved agents are used, the guarantee becomes void!
When softener facilities are used, water softening to a hardness of minimum 6 to
8 °dH is recommended.
The pH-value must not exceed the permissable value of 8.3.
Maintenance instructions
The water hardness of the heating water has to be checked within the scope of the
recommended maintenance of the boiler (every two years) and, possibly, the res-
pective amount of additive has to be added.
Before installation
358 436 08.10 17