Lava ET-81 Wi-Fi Enabled Colour Screen Thermostat User Manual

Lava ET-81 Wi-Fi Enabled Colour Screen Thermostat User Manual

Introduction

The ET-81 is a smart Timerstat used to control your electric underfloor heating system to minimize energy use.

Technical Specification

• Supply voltage: 85-265V 50/60Hz
• Maximum switching current: 15A/3.3KW
• Standby power: < 1W
• IP21

Display

Functions and User Operation

On/Off
Press POWER to turn on/off

Note: When frost protection mode is active, the timerstat will maintain the frost protection temperature when in ‘off’ mode.

Temporarily Override Temperature
In ‘on’ mode, press or to change the current period temperature setting. Press to confirm and go back to the normal screen The timerstat will revert to the normal programmed settings at the start of the next time period.

Set the Time

• In ‘on’ mode, press O and time will be displayed.
• Press O again to enter day set.
• Press A or V to set hour.
• Press to confirm and enter minute set.
• Press A or V to set minute. Press to confirm, then
• Press A or V to set day.
• Press O to confirm and enter hour set.
• press O again to revert to normal screen.

Key-lock

• Setting key-lock can prevent children and others from switching timerstat parameters.
• In ‘on’ mode, press for 3 seconds to lock the timerstat and again for 3 seconds to cancel

Holiday mode

• In holiday mode, the ET-81 will maintain the frost protection temperature until the holiday period ends.
• In ‘on’ mode, press ◯ to enter setting.
• Press △ or ▽ to select holiday.
• Press ◯ to enter holiday days set.
• Press △ or ▽ to set the number of holiday days.
• Press ◯ to confirm and return to the normal screen.

Note: In holiday mode ‘HOLIDAY LEFT’ days remaining will show on the display. Double press ◯ to cancel holiday mode

Hold mode

• The ET-81 will maintain the ‘hold temperature’ until hold is switched off. In ‘on’ mode, press ◯ to enter setting.
• Press △ or ▽ to select hold.
• Press ◯ to enter hold.
• Press △ or ▽ to set hold to ON
• Press ◯ to enter hold temperature set.
• Press △ or ▽ to set hold temperature.
• Press ◯ to confirm and return to the normal screen.
  Note: Whilst in hold mode, ‘HOLD’ will show on the display.
• Double press ◯ to cancel hold mode.

Timer setting

Each day of the week has 4 time periods, you should allot a temperature to each time period. Set the temperature above room ambient temperature and the heating will come on until the desired temperature is reached, or, set the temperature low and the heating will not come on during that time period. The default settings are shown in the table below

• In ‘on’ mode, press ◯ to enter setting.
• Press △ or ▽ to select edit.
• Press ◯ to enter day selection.
• Press △ or ▽ to select the day to be set.
  Note: Weekdays are set as a group, Saturday & Sunday individually.
• Press ◯ to enter period selection.
• Press △ or ▽ to select the period to be set.
• Press ◯ to enter start time set.
• Press △ or ▽ to select the start time hour.
• Press ◯ to enter minute set.
• Press △ or ▽ to select the start time minute.
• Press ◯ to enter temperature set.
• Press △ or ▽ to select the temperature.
• Press ◯ to confirm which will also take you back to period selection.
• Repeat the previous steps for Leave, Return.

Sleep

• When all four time periods have been set, press which will take you back to day selection.
• Repeat the previous steps for Saturday and Sunday.
• Press ◯ twice to return to normal screen or allow to time out at any time and your settings will be saved.

Default period settings for time and temperature

Troubleshooting – Fault Codes

• E1 = Built-in sensor short-circuit or disconnected
• E2 = Floor sensor damaged/disconnected/clamped onto insulation or incorrect floor sensor installed.

Dimensions

Advanced Settings

Note: These are normally set by the installer.

• In ‘on’ mode, press ◯ to enter the setting.
• Press △ or ▽ to select setup.
• Press ◯ to enter the advanced setting Each parameter can be accessed by pressing ◯ and then adjusting the values as required.
• Each parameter can be accessed by pressing ◯ and then adjusting the values as required.

Wiring Instructions

Notes On Advanced Settings

• Temp calibration: Calibrate the temp detected by the room sensor or floor sensor.
• Anti-frozen function: This option allows you to prevent your room from freezing in really cold weather.
• Sensor select:
  • Room sensor: Run by room sensor. Floor sensor: Run by floor sensor.
  • Both sensors: Run by room sensor with floor temp limit.
• Floor temp limit: Always use floor sensors for underfloor heating.
• Temp unit: °C and °F can be selected.
• Output delay: This option helps you avoid inadvertent operation on heating.
• Temp tolerance: The value is 1°C. The thermostat starts to heat when the actual temp is 1°C lower than the set temp and stops heating when the actual temp is 1°C higher than the set temp.
• Brightness: This option allows you to change the brightness of the display.
• Energy use: N/A.
• Schedule: Select a weekly schedule to edit. There are 2 options:
  • 7: Each day from Monday to Sunday can be set individually.
  • 5+1+1: 5 days from Monday to Friday have the same events, Sat and Sun can be set individually.
• Adaptive function: After several days of installation and use, the Adaptive function ensures that the required temp has already been reached when the next event begins. Only switch on when the regular heating pattern is established.
• Reset: Yes – All parameters are restored to default values

Installation Instructions

• This Timerstat should only be wired by a ‘Part P’ qualified
• Electrician as required by IEE regulations.
• The power supply must be on an RCD-protected circuit and connected via a correctly fused switched spur isolator.
• The guarantee is void if these provisions are not followed.
  Before connecting, please test the resistance of the heating cable/s against the values shown in the relevant installation manual to make sure the cable hasn’t been damaged.
• Also, test between live/earth and neutral/earth for a zero reading. Check the floor probe resistance is in the range of 10K Ohms
• The ET-81 timerstat should be mounted using an 86x86x35mm deep wall box.
• Loosen the silver fixing screw on the bottom of the timer start and separate the front from the back.
• Wire the timer start back section as in the above diagram. A maximum of 2 heating cables will go into the wire connectors.
• More than this should be connected into a junction box with a single correctly sized wire to the timerstat.
• The main earth and heating cable earth should be connected behind the timer and start using a block connector.
• Don’t forget to connect the floor probe (not polarised) otherwise, the timerstat will not work properly.
• Reassemble the front to the back and ensure the pins are located in the socket on the back otherwise, it will not work, and tighten up the silver screw.

REFERENCE

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Lava ET-81 Wi-Fi Enabled Colour Screen Thermostat User Manual

Lava ET-81 Wi-Fi Enabled Colour Screen Thermostat User Manual