Standard Values For Water Quality; Top-Up Water; Condensate Return; Water Treatment System - Viessmann Vitomax HS M73 Operating And Service Instructions

Standard values for water quality

Advantages of complying with the guidelines
■ Prolongs boiler service life.
■ Reduces repair costs.
Advantages of using a 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 other instructions stated in the "Standard val-
ues for water quality" chapter are complied with.
Raw water
Not usually suitable as boiler feedwater in its delivered
state and must be treated before use. The type of
boiler feedwater treatment depends on the raw water
quality. As the water quality may change, regular
checks are required.

Top-up water

A suitable water meter should be installed in the water
supply pipe for treating the boiler feedwater. This
records the amount of top-up water added to the recy-
cled condensate. It will also indirectly monitor the
amount of steam removal.

Condensate return

Where possible, feed the condensate back to the feed-
water tank without loss. To fulfil the boiler feedwater
requirements (Tab. 15), the condensate may need to
be treated.

Water treatment system

Depending on raw water quality and amount of top-up
water, the raw water and top-up water must be adjus-
ted to fulfil the boiler water requirements (Tab. 17 & 18
page 20).
In order to do this, a suitable chemical and thermal
water treatment system must be installed.
Recommendation
Contact Viessmann for a quotation for a water treat-
ment system.
If required, there must be an option to add oxygen
binders to the feedwater tank or its inlet pipe (residual
hardness stabilisers, alkalising agents and phos-
phates).
Recommendation
Use a chemical water treatment system in the boiler
system.
Please contact Viessmann for a quotation.
Note
Observation of the following requirements is a neces-
sary condition for safeguarding your warranty rights.
The warranty excludes damage due to corrosion and
scaling. Prevention of damage due to scaling.
Depending on the operating mode (24 h or 72 h) and
country-specific regulations, suitable test devices are
used to ensure compliance with the requirements.
Entry in the operator's log
■ Measurements
■ Amounts of top-up water
Chemical consumption
■
Required maintenance
■
The operator's log can be used to simulate the operat-
ing conditions at any time.
Water quality
19