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HERZ ETKF
Installation
Step 1: Inserting (replacing) the batteries
• Remove the battery compartment cover
• Insert 2 new LR6 batteries (Mignon/AA) into the battery compartment, ensuring they are the
right way round
• Reattach the battery compartment cover and click into place
New alkaline batteries have a life of approximately two years. A battery symbol (
) will indicate when the batteries need
to be replaced. after removing the old batteries, please wait approximately 1 minute before inserting the new ones. This
device does not suport operation with rechargeable batteries.
Nevver recharge standard batteries. Doing so will present a risk of explosion.
Do not throw the batteries into a fire.
Do not short-circuit batteries.
Used batteries should not be disposed of with regular domestic waste. Instead, they should be taken to your
local battery diposal point.
Step 2: Settingthe date and time of day
The firmware version number will be displayed briefly once you have inserted/ replaced the batteries and then you will be
automatically prompted to set the date and time of day.
• Use the setting wheel (C) to set the year (B)
• Confirm with OK (D)
• Use the setting wheel (C) to set the month (B)
• Confirm with OK (D)
• Use the setting wheel (C) to set the day (B)
• Confirm with OK (D)
• Use the setting wheel (C) to set the hour (B)
• Confirm with OK (D)
• Use the setting wheel (C) to set the minute (B)
• Confirm with OK (D)
The motor will start moving back the control pin while the entries are still being made.
• If “InS” is displayed with a rotating „ “ symbol, this indicates that the motor is still moving back. Once the device is
ready for the actuator to be installed on the valve, just “InS” will appear on the display.
• The weekly program and other settings can be customised prior to installation. To do this, press the menu button when
“InS” is shown on the display.
• Once programming is complete, “InS” will reappear on the display and installation (Step 3) can commence.
Step 3: Installing the energy-saving controller
The actuator can be installed on all HERZ TRVs. There is no need to drain away water or fiddle around with the heating system
before doing this.
First, you need to remove the old thermostat dial:
• Turn the thermostat dial anticlockwise as far as it will go.
• Release the thermal ring of the thermostat.
• Remove the thermostat from the valve.
The energy-saving controller can only be installed if “InS” is showing on the display. Following installation, the actuator will
perform an adjustment run so that it can adapt to the valve. During this process, “AdA” will be displayed.
• Place the actuator on the valve.
• Tighten the union nut.
• “InS” will appear on the display, press the OK button.
• The actuator will perform an adjustment run (“AdA” will appear on the display, operation not pos-
sible).
• After that, the actuator will be ready for operation (Auto mode).
If the adjustment run was initiated prior to installation, or if an error message will be displayed (F1, F2, F3); press OK to
move the motor back to the “InS” position.
