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Circulation connection
In order to operate the combi tank with a hot water circulation, a circulation connection attachment from Wikora is to be
installed between the tank and the circulation pipe. The circulation connection attachment is supplied as a pre-assembled unit,
and consists of one T-piece with integrated circulation dip lance made of stainless steel and a DHW mixing valve to prevent
scalding. The attachment is to be installed according to the preceding connection scheme. Any other connection method is not
acceptable and compromises the function of the combi tank. It is recommended to set the DHW mixing valve at 45-55° C.
In general, a circulation pipe involves high stand-by losses. For this reason, we recommend:
The use of a circulation pump which is dependent on time and temperature
•
•
The adequate insulation of the pipes
•
Equipping the circulation pipe with a check valve
6 Commissioning
Before putting into operation, the entire system should be flushed through. Particles in the system compromise the
operating reliability.
Fill the heating system slowly with water and vent all the air.
Open the cold water stop valve and all hot water nozzles. The hot water heat exchanger is full when water leaks out
of all hot water nozzles. Then close all nozzles again.
Start-up the heating system.
While the System is heating up, water will leak out of the safety valve.
Before the handover of the system to the end user/owner, the plumbing contractor should ensure that the
system is tested to full load, controls are set and that pipe work and connections are without leaks. Afterwards,
the end user has to be instructed in the operation and handling of the tank, as well as the system. The instruction must
to be documented in the installation and maintenance record.,
Please note that the operation and lifetime of the system depend decisively on a regular maintenance.
7 Maintenance and wear parts
Regular maintenance increases the lifetime and operation reliability of the system. Decalcification at regular intervals may be
necessary in highly calcareous water areas. Attention – only valid for heating tanks with hot water supply.
A chemical decalcification can be carried out by a specialist using an approved decalcifier and taking the appropriate
precautions.
1.
The safety valve protects the tank against excess pressure. The functional capacity must be checked at regular intervals
by venting. If an expansion vessel is used, the safety valve is not, or only rarely, required. Over a longer period of time
therefore, it can become blocked and not function when needed.
2.
If there is a danger of freezing, the DHW tank should be permanently heated or completely emptied.
3.
A damp cloth is sufficient to clean the outer parts. Please avoid using any abrasive or solvent cleaning.
© Wikora GmbH
Page 6
As of November 2013
Errors excepted.
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