7.5 Anode replacement
1. Opening the HWR reaction vessel to replace anodes
Once the display indicator of the regulator is on the left in the “0” range during the
heating phase, you must check the installed anode and replace it where applicable.
To do this, follow the steps below:
- Close the inlet and outlet on the HWR
- Place a bucket or other collecting vessel under the emptying valve
- If possible remove the bleeder, open the drain ball valve, and speed up the empty-
ing process by pressing the cut-off valve.
- Carefully pull the polycover off in an upwards movement.
- Sever the orange connector on the cable of the functional display.
- Remove the insulation fleece and remove the plug from the plug-in flap.
- The container is closed by means of a flange. Open the vessel and take the flange
with the anode bracket out and check it.
a) If the anode is completely used up and only the black wire is present, it is neces-
sary to install a new anode
b) If the anode is still there and the display was showing “0” before this, an oxide
layer is covering the anode, which is preventing it from working. Clean the anode
with a wire brush, then it should function again. Otherwise check the display func-
tion using a 1.5V. If it doesn’t react, then the display device is faulty.
2. Installing the new anode
When the anodes are completely used up, install the new anodes as follows:
The anodes are attached to a bushing screw (1), which is fed through the flange and
sealed using PTFE seals. Do not remove this bushing screw!
- Do not remove the anode stabiliser.
- Often the anode bracket is strongly soiled and needs to be cleaned using a steel
brush prior to removal.
- In order to remove the anode, hold the bushing screw (1) and loosen the anode
screw (2).
- Hold the new anode by screwing the anode screw (2) into the bushing screw (1). The
firm connection between the anode screw and bracket is important.
- After assembly the firm fit of the entire bushing screw on the flange must be checked
and retightened where applicable.
- Replace the seal of the flange whenever you replace the anode
- Reattach the flange or brass plug on the HWR and pay attention that the cable con-
nection is reattached to the functional display before you replace the plastic lid on the
insulation.
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