Viessmann M22, Operating And Service Instructions

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9
Advantages of complying with the guidelines
■ Prolonged boiler service life
■ Reduced repair costs
Advantages of using chemical water treatment
■ The specified standard values and water conditions
are observed
■ No additional corrosion protection is required
– If the system is designed as a hot water heating
system sealed against corrosion and
– If all the other instructions stated in chapter "Stand-
ard values for water quality" are complied with
Recommendation
Use a chemical water treatment system in the boiler
system.
Request a quotation from Viessmann (for contact
details, see page 33).
Note
Observation of the following requirements is a neces-
sary condition for safeguarding your warranty rights.
The warranty excludes damage caused by scaling or
failure to adhere to water quality conditions.
Flow temperatures
≤
100 °C (VDI 2035 Part 1-2)
Recommendations
■ Prevent scale deposits (calcium carbonate) from
forming on the heating surfaces.
■ Pay particular attention to the standard values speci-
fied in VDI Guideline 2035 Part 1 "Prevention of
damage in water heating installations – Scale forma-
tion in domestic hot water supply installations and
water heating installations".
Conditions of applicability
■ Fill and top-up water consumed by the system during
its service life: Max. 3 times its capacity
■ Specific system volume: < 20 l/kW heating output. In
the case of multi boiler systems: The output of the
smallest steam boiler or hot water boiler applies here
■ All measures to prevent corrosion on the water side
in accordance with VDI 2035 Part 2 have been com-
plied with
Standard values (extract)
Total heating output kW
>
600
Total alkaline earths
mol/m
3 < 0.02
Total hardness °dH < 0.11
Tab. 1
Fill and top-up water
Soften the water:
■ If the total of alkaline earths in the fill and top-up
water exceeds the standard value
■ If larger fill and top-up water volumes are expected
Log the water volumes:
■ Install a water meter
■ Enter the volume of water filled and the water hard-
ness in the boiler system operator's log
Reduction of water consumption:
Install shut-off valves in each section of the system.
This enables the heating water to be drained just
from the affected section when work is required on
the system.
Operating information
■ Start the system in stages:
– Begin with the boiler with the smallest output
■ Prevent localised limescale deposits on the heating
surfaces by setting a high heating water flow velocity
■ When carrying out work on the system, only drain
the affected sections of the system
■ Only fill the heating system with treated water:
Occasions when this will be necessary:
– Commissioning
– Recommissioning
– After repairs or system expansion
– Filling with top-up water
■ Check filters, dirt traps and other blow-down or sepa-
rating facilities in the heating water circuit for depos-
its; clean them and check they are working correctly:
How often:
– After commissioning and reinstallation: At shorter
intervals
– Depending on the water treatment applied, e.g.
water softening: As required
Limescale deposits
Production
Limescale deposits shorten the service life of the
boiler. They form when the specified preventive meas-
ures have not been implemented correctly.
Preventive action:
■ Observe VDI Guideline 2035
■ Observe the information in these instructions
Remedies:
■ Remove deposits immediately
■ Restore operational viability of the boiler system
■ Check the boiler system for damage before recom-
missioning
■ Ensure that excessive limescale deposits (scaling)
cannot recur
■ Rectify incorrect operating parameters
Water quality
Standard values for water quality
6152553
Service