HORSTMANN CENTAURPLUS HRT4-ZW (01) PDF Document

The indicator against the radio mast symbol on the CentaurPlus ZW shows that the radio link is established. A flashing indicator means that the wireless connection has been temporarily lost. This is usually restored by going to the thermostat and turning the dial up and down. If no indicator is present next to the radio mast symbol, then this would suggest that the CentaurPlus ZW and the HRT4-ZW thermostat have not been paired correctly on installation.

The room thermostat will only operate during “On” periods set by the time control, which is always indicated by the red neon indicator light on the front. If there is no light, then the heating is “Off” and the room thermostat is inoperative. When the timeswitch is “On” (shown by the red indicator light), the thermostat will be operational.

When the thermostat is “calling” for heat, the flame symbol will appear in the thermostat display. If the timeswitch is “On,” the heating will be operative and will run under the control of the timeswitch and the temperature set on the room thermostat.

The boost facility allows the user to boost the system which is currently “OFF” for 1 hour. To activate it, press the BOOST button. “BOOST” will be shown on the display for the duration of the boost period, and the system ON indicator will be illuminated. To cancel the boost and return to normal programming, press the BOOST button again at any time during the boost period.

The advance facility allows the user to advance the system to “ON” when currently “OFF” or switch the system “OFF” when currently “ON”. Press the ADVANCE button once to move to the next ON/OFF time. “ADVANCE” will be shown on the display until the next programme switching time. To cancel the advance, press the ADVANCE button again to return the unit to its normal programme.

You can alter the functionality of the programme by using the SELECT button. The options include:

AUTO: Timeswitch follows all programmed “ON” and “OFF” times.

ALL DAY: Timeswitch operates from the 1st “ON” time until the 3rd “OFF” time, ignoring all switching times in between.

24hrs: Timeswitch will be constantly “ON”.

OFF: Timeswitch will be constantly “OFF”. This allows you to turn off the heating during the summer without altering the programme times (Boost is still available).

Press the SELECT button repeatedly to cycle through these options. The settings are permanent until altered by the user.

If the display becomes frozen or scrambled, or to revert to default time settings, reset the unit by pressing the SET and SELECT buttons together. This must be done with the power “ON”. Release the buttons, and the timeswitch will return to preset factory settings.

To set the clock and calendar:

1. Press the SET button until the set indicator is next to the “clock” position.

2. Use the + and – buttons to adjust the hour and press ENTER.

3. Use the + and – buttons to adjust the minutes and press ENTER.

4. Use the + and – buttons to set the date and press ENTER.

5. Use the + and – buttons to set the month and press ENTER.

6. Use the + and – buttons to set the year and press ENTER.

Once the year is set and ENTER is pressed, the process is complete, and the display returns to the run position. Check that the correct time and day are showing.

To alter the time settings:

1. Press the SET button until the SET indicator is next to the PROG position.

2. Use the PLUS and MINUS buttons to adjust the day.

3. To Copy: If you want to copy settings to another day, select the day required and press COPY (“IN” is displayed). Repeat for other days as required.

4. To Set Independent Times: Press ENTER. Use the PLUS and MINUS buttons to select the day required and press ENTER.

5. Use the PLUS and MINUS buttons to adjust the 1st ON time, then press ENTER.

6. Use the PLUS and MINUS buttons to adjust the 1st OFF time, then press ENTER.

7. Repeat this process for the 2nd and 3rd settings.

8. To finish programming, press the SET button until the SET indicator is in the RUN position.

Note: If a midday “ON” period is not required, ensure the 2nd ON/OFF times are both set to 12:00pm, which cancels the period.

The default time settings preset at the factory are as follows:

Note: The factory default settings for the 2nd ON/OFF times are both set at 12:00pm (midday) which cancels this “ON” period giving 2 ON/OFF periods for the day.

To adjust the required temperature setting, turn the dial anti-clockwise to decrease it and clockwise to increase it. The display will show the required temperature setting and can be adjusted in increments of 1°C.

Pressing the temperature setting dial will allow you to check the current actual measured room temperature, which will be displayed for approximately 7 seconds before returning to the set temperature.

When the batteries are nearing the end of their life, a low battery symbol will appear in the display. The batteries should be changed within a few days. If the batteries are not changed, eventually a “LO” battery message flashes intermittently in the display. If this happens, the batteries should be changed immediately.

To change the batteries:

1. Undo the two captive screws at the base of the thermostat and swing the thermostat up and away from the wall plate.

2. Remove the old batteries and replace them with two new AAA size alkaline batteries, ensuring they are fitted correctly as indicated by the terminal markings.

3. Re-fit the thermostat to the wall plate by engaging with the lugs at the top of the wall plate and pushing the thermostat into position.

4. Locate it over the captive screws at the base of the wall plate and tighten so that the thermostat is locked into position.

5. Check the temperature setting is correct and adjust if necessary.