Commissioning; Maintenance And Wear Parts - WIKORA WPKR 750 Installation Manual Operating Instructions

6 Commissioning


Before putting into operation, the entire system should be flushed through. Particles in the system compromise the
operating reliability.
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When filling the system, fill the DHW tank first and put pressure on it. Open the cold water stop valve and all hot
water nozzles. The tank is full when water leaks out of all hot water nozzles. Then close all nozzles again.

Fill the heating system slowly with water and vent all the air.

Start-up the heating system.
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Set the DHW temperature and supervise the system while heating up.

While the System is heating up, water will leak out of the safety valve.
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After the tank has heated up and cooled down for the first time, the flange screws must be retightened by
means of a set torque wrench and the flange connection should be checked for tightness.
Torque chart
External diameter of flange/
Diameter of pitch circle
170 / 145 mm
180 / 150 mm
210 / 180 mm
280 / 245 mm

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.
1 . Close the cold water stop valve and drain the tank to check the inner tank as well as the heat exchanger. Disconnect any
electrical devices from the appliance. Then, carefully remove the insulation of the flange cover and unscrew the flange
cover. Limescale and rough residues can be crushed by a wooden bar. Only use an approved decalcifier. Screw the
flange cover hermetically after the cleaning process by using a new flange seal. Fill the tank and check all connections for
tightness. Finally, replace the insulation and, if necessary, remount the electrical devices accordingly.
A chemical decalcification can be carried out by a specialist using an approved decalcifier and taking the appropriate
precautions. Please note that the tank must be disconnected from the DHW installation (cold water / hot water /
circulation).
2. For protection purposes, the tank is equipped with a magnesium protection anode. Its transmission depends on the local
water properties. It should be examined for the first time after 2 years and afterwards annually in order to check its
transmission. The diameter should be at least 1/3 of the original diameter, the surface should be homogenous and without
any limescale crust. If necessary, it should be replaced by an original Wikora anode to protect the tank against corrosion.
2.a. Alternatively, the tanks can be equipped with an external current anode. Please note that a protection against
corrosion is only guaranteed if the anode is energized and connected accordingly.
If the protection anode is neglected, this can cause damage through corrosion and lead to a loss of warranty.
3. 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 ti me
therefore, it can become blocked and not function when needed.
4. If there is a danger of freezing, the DHW tank should be permanently heated or completely emptied.
5. A damp cloth is sufficient to clean the outer parts. Please avoid using any abrasive or solvent cleaning agents.
© Wikora GmbH
Torque Nm
32 Nm
32 Nm
40 Nm
70 Nm
Page 6 As of 6/22/2015
Errors excepted.