Heatmiser Slimline-RF V3 Wireless Thermostat Manual

What is a Programmable Room Thermostat?

A programmable room thermostat functions as both a programmer and a room thermostat. The programmer allows setting "On" and "Setback" periods to suit your lifestyle. The room thermostat senses air temperature, switching heating on when the temperature drops below the set point and off once the set temperature is reached.

It enables users to select desired heating times and target temperatures, allowing for different settings throughout the day and week to meet specific needs. Setting a higher temperature does not speed up room heating; this depends on the heating system's design and size. Similarly, reducing the temperature setting does not affect how quickly the room cools down. Setting a lower temperature results in the room being controlled at a lower temperature, saving energy.

To effectively use the thermostat, identify comfortable temperature settings for different times and allow the device to manage the system.

Installation Procedure

Do:

• Mount the thermostat at eye level.
• Read the instructions fully for optimal product use.

Don't:

• Install near a direct heat source, as this affects functionality.
• Push hard on the LCD screen, as this can cause irreparable damage.

Thermostats require free airflow to sense temperature accurately and should not be covered by curtains or blocked by furniture. Nearby heat sources like electric fires, televisions, or lamps can also interfere with proper operation.

This wireless thermostat is designed for surface mounting.

Installation Steps:

1. Carefully separate the front half of the thermostat from the back plate using a small flat head terminal driver inserted into the slots on the bottom face.
2. Mark two hole positions on the wall using the backplate as a template. Drill at these positions and insert wall plugs.
3. Securely screw the thermostat back plate to the wall.
4. Clip the front of the thermostat back onto the back plate.

Installing the Batteries

Two AAA batteries are supplied with the thermostat. To access the battery holder, push and release the compartment door located on the bottom face of the thermostat. The thermostat will indicate when batteries need replacement via an on-screen battery icon.

Important: Do NOT use rechargeable batteries with this product.

Description of image: The thermostat with its battery compartment open, showing two AAA batteries.

Insert batteries into the holder, ensuring correct polarity (+ / -). Push the battery holder back into the thermostat until it is secured.

Replacing the Batteries

Batteries have a limited lifespan and require occasional replacement for correct thermostat operation. The thermostat will display a battery icon [?] on screen when replacement is needed.

Note: Batteries must be replaced within 1 minute of removal to retain current clock and comfort level settings.

Description of image: The thermostat display showing a flashing battery icon.

Receiver Type

The Slimline-RF V3 communicates wirelessly with a receiver to control heating or hot water. Select the appropriate receiver type from the list provided on pages 9 & 10 and follow the relevant pairing instructions.

To control heating only, set Feature 10 on the Slimline-RF to mode 00 or 01. For heating and hot water control, set Feature 10 to mode 02 (refer to page 34).

Description of images: Four different Heatmiser receiver units are shown: UH8-RF V2, RF-Switch V2, RF-Switch, and RF-Switch 16 Amp, with their respective page references.

Pairing Menu Explained

Feature P1 - Pairing: For RF-Switch V1 & V2, RF-Switch 16 Amp & UH8-RF V2.

Feature P2 - Setting the UH8-RF address: This refers to the number set on the rotary dials within the UH8-RF unit, indicating the zone number and zone type.

Feature P3 - Failsafe: If the receiver fails to receive a signal from the Slimline-RF V3 for 40 minutes, it will activate the output for 12 minutes every hour until a signal is received.

Pairing Menu

To enter pairing mode:

• Turn Off the thermostat by holding the [Power Button] for 3 seconds.
• Hold down the [H Button] for 3 seconds until 'P1' appears in the top right corner of the display.
• Repeatedly press the [Clock Key] to select the desired P1, P2, or P3 setup pages.

Pairing with the UH8-RF V2 Wiring Centre

You can pair the Slimline-RF V3 to multiple channels on the UH8-RF V2.

Step 1, On the UH8-RF V2:

• Press and hold the pairing button on the desired channel until the output indicator LED flashes. Pairing mode is now active.
• Once the UH8-RF V2 detects the pairing signal from the Slimline-RF V3, the output light will turn off.

Step 2, On the Slimline-RF V3:

• Turn Off the thermostat by holding the [Power Button] for 3 seconds.
• Hold down the [H Button] for 3 seconds until 'P1' appears in the top right corner of the display.
• Tap the [H Button] once while 'P1' is shown to start a 99-second countdown.
• During the countdown, the thermostat will transmit a signal and flash the [RF Icon] at the top left corner of the display.
• If pairing is successful, the countdown will jump to 00 followed by a blank screen.
• Press the [Power Button] once to turn the unit back On.

If configured in mode 02, the hot water timer will automatically be paired to the HW channel.

If pairing is unsuccessful, reposition the thermostat closer to the receiver to eliminate potential signal issues and repeat the pairing process.

Pairing With the UH8-RF Wiring Centre

Step 1, On the UH8-RF: Note the numbers set on the rotary switches (UH8-RF ID numbers 01-99). Each UH8-RF unit on the system requires a unique ID number. Set your first UH8-RF to 01.

Description of image: A rotary switch showing ID No. 99.

Step 2, On the Slimline-RF V3:

• Turn Off the thermostat by holding the [Power Button] for 3 seconds.
• Hold down the [H Button] for 3 seconds until 'P1' appears in the top right corner of the display.
• Press the [Clock Key] once to change P1 to P2 on the display.
• Press the [H Button] once to enter P2 settings.
• Use the [Up Arrow]/[Down Arrow] keys to change the large digits to match the Rotary Switch on the UH8-RF, followed by H.
• Use the [Up Arrow]/[Down Arrow] keys to change the small digits (top right) to select a Zone number on the UH8-RF, followed by H.
• Use the [Up Arrow]/[Down Arrow] keys to select "rA" for radiator zone or "UF" for underfloor heating, followed by A to store the configuration.
• Press the [Power Button] once to turn the unit back On.

If configured in mode 02, the hot water timer will automatically be paired to the HW channel.

Pairing With the RF-Switch V2

Step 1, On the RF-Switch V2: Press and hold the CH1 or CH2 button for 5 seconds. The CH1/2 light will flash, indicating pairing mode is active. Once the RF-Switch V2 detects the pairing signal from the Slimline-RF V3, the CH1/2 light will turn off.

Step 2, On the Slimline-RF V3:

• Turn Off the thermostat by holding the [Power Button] for 3 seconds.
• Hold down the [H Button] for 3 seconds until 'P1' appears in the top right corner of the display.
• Tap the [H Button] once while 'P1' is shown to start a 99-second countdown.
• During the countdown, the thermostat will transmit a signal and flash the [RF Icon] at the top left corner of the display.
• If pairing is successful, the countdown will jump to 00 followed by a blank screen.
• Press the [Power Button] once to turn the unit back On.

If configured in mode 02, the hot water timer will automatically be paired to the HW channel.

If pairing is unsuccessful, reposition the thermostat closer to the receiver to eliminate potential signal issues and repeat the pairing process.

Pairing With the RF-Switch

Step 1, On the RF-Switch: Press and hold the CH1 button for 5 seconds. The CH1 light will flash, indicating pairing mode is active. Once the RF-Switch detects the pairing signal from the Slimline-RF V3, the CH1 light will turn off.

Step 2, On the Slimline-RF V3:

• Turn Off the thermostat by holding the [Power Button] for 3 seconds.
• Hold down the [H Button] for 3 seconds until 'P1' appears in the top right corner of the display.
• Tap the [H Button] once while 'P1' is shown to start a 99-second countdown.
• During the countdown, the thermostat will transmit a signal and flash the [RF Icon] at the top left corner of the display.
• If pairing is successful, the countdown will jump to 00 followed by a blank screen.
• Press the [Power Button] once to turn the unit back On.

If configured in mode 02, the hot water timer will automatically be paired to the HW channel.

If pairing is unsuccessful, reposition the thermostat closer to the receiver to eliminate potential signal issues and repeat the pairing process.

Pairing With the RF-Switch 16 Amp

Note: Feature 10 Mode 02 is not suitable for the RF-Switch 16 Amp unit.

Step 1, On the RF-Switch 16 Amp: Press and hold the Pair button for 5 seconds. The Pair light will flash, indicating pairing mode is active. Once the RF-Switch detects the pairing signal from the Slimline-RF V3, the Pair light will turn off.

Step 2, On the Slimline-RF V3:

• Turn Off the thermostat by holding the [Power Button] for 3 seconds.
• Hold down the [H Button] for 3 seconds until 'P1' appears in the top right corner of the display.
• Tap the [H Button] once while 'P1' is shown to start a 99-second countdown.
• During the countdown, the thermostat will transmit a signal and flash the [RF Icon] at the top left corner of the display.
• If pairing is successful, the countdown will jump to 00 followed by a blank screen.
• Press the [Power Button] once to turn the unit back On.

If pairing is unsuccessful, reposition the thermostat closer to the receiver to eliminate potential signal issues and repeat the pairing process.

LCD Display

Description of image: A diagram of the thermostat's LCD screen with 15 numbered elements.

1. RF Icon: Flashes when the thermostat communicates with the receiver.
2. Day Indicator: Displays the current day.
3. Frost Icon: Displayed when the thermostat is in frost protection mode.
4. Flame Icon: Displayed when the thermostat is calling for heat; flashes when the Optimum Start function is in operation.
5. Temperature Hold: Displayed when manually overriding the program, showing "HOLD FOR" and the time period.
6. Room Temp: Indicates the current temperature sensor mode.
7. Set: Displayed when changes are made to programs or temperature set points.
8. Holiday Indicator: Displayed when the programmer is in holiday mode.
9. Current Temp: Indicates the current sensor temperature.
10. Program Cycle Indicator: Displayed during programming to show which period is being altered.
11. Battery Level: Indicates when batteries [?] require replacement.
12. Keypad Lock Indicator: Displayed when the keypad is locked.
13. Timer Status: Displays the current state of the timed output.
14. Units of Temperature: Degrees Celsius or Fahrenheit.
15. Clock: Digital clock display in 24h format.

Setting the Clock

To set the clock, follow these steps:

• With the thermostat turned ON, press the [Clock Key] twice.
• Use the [Up Arrow]/[Down Arrow] keys to set the hours.
• Press [H Button] to confirm settings.
• Use the [Up Arrow]/[Down Arrow] keys to set the minutes.
• Press [H Button] to confirm settings.
• Use the [Up Arrow]/[Down Arrow] keys to set the day of the week.
• Press [A Button] to confirm settings and return to the main display.

Description of image: Thermostat display showing "Sun" for day and "08:00" for hours, with "Minutes" indicated.

Note: When configured for programmable hot water control (Feature 10=02), press the clock key 3 times to enter the clock setting screen.

Temperature Display

The temperature display information is driven by two inputs: the sensor measurement and the target temperature you have set.

Description of image: Two thermostat displays. The left shows "ROOM TEMP" and "20°C". The right shows "SET" and "21°C".

The left display shows the current room temperature. The right display shows the target temperature you are trying to achieve.

Comfort Levels Explained

The thermostat offers Weekday/Weekend or 7 Day Programming options. Consult the "Optional Features" section to select the desired mode.

The thermostat comes with pre-programmed comfort levels, which can be easily changed. Default settings are:

• 08:00 - 21°C (Wake)
• 09:30 - 16°C (Leave)
• 16:30 - 22°C (Return)
• 23:00 - 17°C (Sleep)

If only 2 levels are needed, program unused levels to "--.--".

Note: For Weekday/Weekend programming, the 4 comfort levels are the same for all weekdays but can differ for weekends. For 7 Day programming, each day has 4 distinct comfort levels.

To program comfort levels, press the [Clock Key] once.

Description of images: Two thermostat displays. The left shows "Mon Tue Wed Thu Fri" indicating Weekday/Weekend programming. The right shows only "Mon" indicating 7 Day programming. Both show "SET", "WAKE", "08:00", and "21°C".

Programming Comfort Levels:

• Use the [Up Arrow]/[Down Arrow] keys to enter the required WAKE time.
• Press [H Button] to confirm settings.
• Use the [Up Arrow]/[Down Arrow] keys to enter the required WAKE temperature.
• Press [H Button] to confirm settings.
• The display will then show "LEAVE".
• Repeat these programming steps for each period until complete.
• For unused periods, enter "--.--"; the thermostat will ignore these settings.
• Press [A Button] to confirm settings and return to the main display.

Notes:

• In 7 Day programming mode, you can program each day independently.
• In Weekday/Weekend programming mode, "Sat Sun" will be displayed, allowing you to program the weekend.
• To change the programming mode, refer to pages 33 & 34.

Setting the Hot Water Switching Times

Follow these steps to set hot water switching times:

• Press the [Clock Key] twice.
• If using Weekday/Weekend programming, "Mon-Fri" will be displayed. For 7-day programming, "Mon" will be displayed.
• Use the [Up Arrow]/[Down Arrow] keys to enter the required start time for Hot Water Time 1.
• Press [H Button] to confirm settings.
• Use the [Up Arrow]/[Down Arrow] keys to enter the required end time for Hot Water Time 1.
• Press [H Button] to confirm settings.

Repeat these steps for each switching time, entering "--.--" for any unused periods.

Description of image: Thermostat display showing "Mon Tue Wed Thu Fri", "SET", "WAKE", "08:00" (Time), and "TIMER ON" (Timer Status).

Note: This function is only applicable when configured in programmable mode with hot water control (Feature 10=02).

Locking the Thermostat

The thermostat features a keypad lock. To activate the lock:

• Press and hold the [A Button] and [Down Arrow] keys together for 10 seconds.
• The lock symbol [?] will appear on the screen.

To unlock, repeat these steps until the lock symbol disappears.

Note: The keypad lock indicator is only displayed when the lock is active.

Description of image: Thermostat display showing "Wed", "08:00", "21°C", and the lock symbol [?] with a label "Keypad Lock Indicator".

Temperature Control

The [Up Arrow]/[Down Arrow] keys allow you to adjust the set temperature. When either key is pressed, "SET" and the desired temperature will be displayed.

Use the [Up Arrow]/[Down Arrow] keys to adjust the SET value.

Press [A Button] to confirm settings and return to the main display.

Note: This manual override will be maintained until the next programmed comfort level.

Description of image: Thermostat display showing "SET" and "21°C" labeled as "Set Temperature" and "Set Icon".

Temperature Hold

The temperature hold function allows manual override of the current operating program to set a different temperature for a desired period.

• Press [H Button] to commence temperature hold.
• Use the [Up Arrow]/[Down Arrow] keys to enter the required Hold time.
• Press [H Button] to confirm settings.
• Use the [Up Arrow]/[Down Arrow] keys to enter the required Hold temperature.
• Press [A Button] to confirm settings and return to the main display.

The "Hold For" indication will be displayed on screen. The time will count down, and then the thermostat will revert to the normal program.

Description of image: Thermostat display showing "HOLD FOR 01:00" labeled as "Hold ON Indicator" and "Hold Time Remaining", with "SET" and "21°C".

To cancel temperature hold, follow the same steps but reduce the Hold time to 00:00 hours.

Holiday

The holiday function reduces the set temperature to the frost protection setting for the duration of the holiday. The thermostat will automatically return to the program schedule upon your return.

• Press [H Button] three times (until the suitcase icon [?] appears on screen).
• Use the [Up Arrow]/[Down Arrow] keys to enter the number of holiday days.
• Press [A Button] to confirm settings and return to the main display.

The display will show a suitcase icon [?], indicating the thermostat is in holiday mode.

Note: A holiday period starts at 00:00 the next day. For example, a holiday set on Friday for 2 days means Saturday is the first day, and the thermostat reverts to the schedule at 00:00 on Monday.

Description of image: Thermostat display showing "02" labeled as "Holiday Days Holiday" and an "ON Indicator".

To cancel, follow the same steps but set the Holiday duration to 00 days.

Hot Water Override

You can override the hot water setting by pressing the [A Button]. If hot water is OFF, pressing [A Button] turns it ON. If hot water is ON, pressing [A Button] turns it OFF. The "Timer ON" or "Timer OFF" status will flash to indicate the override. This override lasts until the next programmed setting.

Description of image: Thermostat display showing "Wed", "16:30", "20°C", and "TIMER ON" labeled as "Timer Status".

Frost Mode

Pressing the [Power Button] once places the thermostat in Frost Protect mode. In this mode, the thermostat displays the frost icon [❄️] and only turns on heating if the room temperature drops below the set frost temperature.

Setting the frost temperature:

• Press the [Power Button] once to enter frost mode.
• Use the [Up Arrow]/[Down Arrow] keys followed by the [A Button] to select and store the frost temperature.

The selectable frost range is 7°C to 17°C. If heating activates in frost mode, the flame icon [?] will be displayed.

To cancel frost protect mode, press the [Power Button] once again.

Heating On/Off

Heating is indicated ON when the flame icon [?] is displayed. When the flame icon is absent, there is no requirement for heating, but the thermostat remains active.

To turn the thermostat OFF completely, press and hold the [Power Button]. The display and heating output will turn OFF, provided Frost Protection is disabled (see pages 31-34).

Press the [Power Button] once to turn the thermostat back ON.

Re-calibrating the Thermostat

If re-calibration is needed, follow these steps:

• Press and hold the [Power Button] to turn the thermostat OFF.
• Press and hold BOTH the [Power Button] and [Down Arrow] keys together until the temperature appears on the screen.
• Use the [Up Arrow]/[Down Arrow] keys to configure the new temperature.
• Press [A Button] to confirm settings.
• Press the [Power Button] once to turn the thermostat back ON.

Factory Reset

The thermostat has a reset function to restore all settings to their factory defaults.

To perform a factory reset:

• Press and hold the [Power Button] to turn the thermostat OFF.
• Press and hold the [Power Button] and [Up Arrow] keys together until the LCD powers up, displaying all icons.
• When the icons disappear, the thermostat has been successfully reset.
• Press the [Power Button] once to turn the thermostat back ON.

Optional Features Explained

• Feature 01 - Temperature Format: Select between °C and °F.
• Feature 02 – Switching Differential: Adjust the switching differential. Default is 1°C (e.g., heating on at 19°C, off at 20°C). With a 2°C differential, heating is on at 18°C, off at 20°C.
• Feature 03 – Frost Protect: Set whether the thermostat maintains frost temperature when the display is off. Default is enabled.
• Feature 04 – Output Delay: Set an output delay (00-15 minutes) to prevent rapid switching. Default is 00 (no delay).
• Feature 05 – Temperature Up/Down Limit: Limit the use of the up/down keys, applicable when the thermostat is locked, allowing limited control.
• Feature 06 – Air Sensor Selection: Choose between the built-in sensor or a remote air sensor.
• Feature 07 – Optimum Start: Delays heating start-up to ensure the building is warm at the programmed time, calculating heating needs based on the rate of temperature change.
• Feature 08 – Rate of Change: For information only.
• Feature 09 – Program Mode: Available modes: 5/2 Day Programming (4 levels weekdays, 4 weekends), 7 Day Programming (4 levels per day), 24 Hours (4 levels over 24 hours).
• Feature 10 – Thermostat Mode: Set the operating mode: manual (non-programmable), programmable, or programmable with hot water time clock.

Adjusting the Optional Settings

To adjust optional settings:

• Press and hold the [Power Button] to turn the thermostat OFF.
• Press and hold the [Clock Key] until the display shows the feature number and setting value.
• Use the [Clock Key] to cycle through features.
• Use the [Up Arrow]/[Down Arrow] keys to change the setting.
• Press [A Button] to confirm settings.
• Press the [Power Button] once again to turn the thermostat back ON.

Optional Settings - Feature Table

Wiring Diagram - Remote Sensor

REMOTE AIR PROBE

Set feature 06 to 01 to enable the remote air probe.

Description of diagram: Shows connections for a remote air probe with terminals labeled '-' and 'RT2', and a battery holder with '+' and '-' terminals.

Notes

(Space for user notes)

Want More Information?

Call the support team on: +44 (0)1254 669090

Or view technical specifications on the website: www.heatmiser.com

Description of icons: Links to PDF and FAQ resources, and social media links for Twitter (@heatmiseruk) and Facebook (facebook.com/thermostats).