hajdu ID20A, Manual

Page: 15 / 43

15
EN
When establishing pipeline connection, follow the installation order of the fittings according
to Figure 2 as the correct operation of the equipment depends on this. The combined safety
valve has to be connected to the cold water branch respecting the flow direction marked by
an arrow. The equipment has to be provided with a safety valve controlled for maximum 0.7
MPa operating pressure.
[The safety valve has to be mounted directly in front of the storage tank, onto the coldwater
branch, in a frost-free environment.
The safety valve is an accessory of the equipment.
Before mounting the valve, the coldwater pipe has to be flushed thoroughly, in order to
avoid any damage caused by a possible pollution. The combined safety valve contains a
one-way valve therefore it is not necessary to mount in a separate one-way valve. During
heating, leakage of extending water has to appear on the outlet tube of the combined safety
valve. When mounting, check if leakage is visible.
If the water pressure in the system exceeds the value of 0.6 MPa even temporarily, a pressure
reducing valve has to be mounted in front of the hot water storage tank, in the place as
indicated in Figures 1.b and 2.b. If this is missing, at the above mentioned pressure, the
safety valve will be leaking outside heating as well. The pressure reducing valve has to be
purchased and mounted by the customer. A closing valve has to be mounted in the coldwater
pipe leading to the storage tank in front of the fittings (combined safety valve, one-way
valve, etc.). With the help of this, the hot water storage tank and the water pipe fittings can
be separated from the pipeline (in the case of failure or other maintenance works).
OPERATION AND MAINTENANCE
If you observe water leakage or other abnormality from the inside of the storage tank,
immediately separate the equipment from the pipeline with the help of the closing valve.
IN THE CASE OF INDIRECT HEATING, PROTECTION AGAINST OVERHEATING HAS TO BE PROVIDED BY THE
INDIRECT HEATING EQUIPMENT.
Active anode
In addition to the enamel coating, the tank of the hot water storage tank is protected by an
anode as well against corrosion therefore it is important that the tank should always contain
an active anode of an appropriate size. Therefore the state of active anode has to be revised
every two years. This shall be a pre-condition of the guarantee for the tank (see warranty
certificate). If the anode diameter shrinks to about 10 mm, it has to be replaced.
It is extremely important that the active anode should be in a proper contact with the tank.
Therefore when a new anode is mounted or after other repair works, the link between the
active anode and the earthing screw has to be implemented in a way that provides a contact
of electrically proper conduction.]
Scale removal
Depending on the quality and quantity of the used water, scale deposition may occur on the
heat exchanger and the tank wall. The deposited scale decreases the efficiency of