20
Thermann Installer's Manual
Heat Pump Water Heaters
Draining the cylinder
WARNING Burns
Hot water may escape when you drain the appliance.
To drain the hot water cylinder, e.g. when shutting the appliance down, proceed as follows.
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Isolate the appliance from the power supply.
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Close the shut-off valve in the cold water inlet line.
The hot water cylinder is drained via the cold water supply line.
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Open the drain valve installed in the cold water supply line (see chapter "Water connection"). If no drain
valve has been installed, undo the cold water supply line at the "Cold water inlet" connection.
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To vent the system, undo the hot water line connected to the "hot water outlet" connection.
Some residual water will remain in the bottom of the hot water cylinder.
Descaling the electric emergency/booster heater
Only descale the flange of the emergency/booster heater after disassembly. Never treat the inside of the hot
water cylinder or the impressed current anode with descaling agents. The electric emergency/booster heater
is screwed into the hot water cylinder of the appliance at a central point at the top.
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1 Electric emergency/booster heater with protective anode
Valves
Regularly check the valves in the system (safety valve, pressure reducing valve, drain valve) to ensure the
operational reliability of the appliance. The amount of limescale deposits depends on the local water quality.
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Check all valves in the system and remove limescale deposits.
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Replace the valves if necessary.
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Check the function of the valves.
Condensate drain
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Check whether the condensate drain is clear of obstructions. Remove contaminants.
Replacing the power cable
WARNING Electrocution
The power cable must only be replaced (for example if damaged) by a qualified contractor.
