Heatmiser PRT-EWTS Programmable Room Thermostat

What is a Programmable Room Thermostat?

A programmable room thermostat combines the functions of a programmer and a room thermostat. A programmer allows users to set 'On' and 'Off' periods according to their lifestyle. A room thermostat senses the air temperature, activating the heating when the temperature drops below the set point and switching it off once the set temperature is reached.

This type of thermostat enables users to specify desired heating times and temperatures, allowing for different settings throughout the day and week to match personal needs and preferences. Setting a higher temperature does not accelerate room heating; this depends on the heating system's design and size. Similarly, reducing the temperature setting does not affect cooling speed but results in a lower controlled room temperature, saving energy.

The most effective use involves finding comfortable minimum temperature settings for different times and leaving the thermostat to manage the system. A recommended approach is to start with a low temperature (e.g., 18°C) and increase it by 1°C daily until comfort is achieved, avoiding further adjustments to save energy.

Temporary adjustments can be made via overriding or the temperature hold feature, detailed on pages 15 and 16. Programmable thermostats require unobstructed airflow for accurate temperature sensing; they should not be covered by curtains or furniture. Nearby electronic devices like fires, televisions, or lamps can also interfere with proper operation.

Installation Procedure

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

Don't: Do not push hard on the LCD screen, as this can cause irreparable damage. Do not install near direct heat sources, as this affects functionality. If using the desk stand, ensure it is away from heat sources.

Wall Mounting:

1. Fix the wall plate to the wall.
2. Push the thermostat onto the wall plate.

Desk Stand:

1. Remove the thermostat from the wall plate.
2. Release the desk stand.

Diagram Description: The installation section includes visual aids showing the wall mounting plate, the thermostat attaching to it, detaching the thermostat, and releasing the desk stand.

LCD Display

The thermostat's LCD screen displays various indicators and information:

• 1. Day Indicator: Shows the current day.
• 2. Holiday Indicator: Appears when the thermostat is in Holiday mode.
• 3. Temperature Hold: Appears when the programmer is in Hold mode.
• 4. Clock: Displays the current time, time remaining in hold, or days left in holiday mode.
• 5. Up/Down Keys: Adjust values on the top digit group.
• 6. Flame Icon: Indicates heating is ON; flashes during Optimum Start operation.
• 7. Keypad Lock Icon: Appears when the keypad is locked.
• 8. RF Icon: Flashes during communication with the receiver.
• 9. Frost Icon: Appears when heating is off and the system is in frost protection mode.
• 10. Floor Temp Achieved Icon: Displays when the floor set temperature is reached.
• 11. Battery Icon: Shows the current battery charge level.
• 12. Room Temp: Indicates the current temperature sensor mode.
• 13. Set: Appears when programs or temperature points are being changed.
• 14. Clean Screen: Freezes the screen for 15 seconds to allow cleaning.
• 15. Up/Down Keys: Adjust values on the bottom digit group.
• 16. Power/Cancel: Press once to enable/disable frost protection or turn off the display; press and hold to turn off completely. 'Cancel' exits setup/program operations.
• 17. Setup/Programming Keys: Navigate setup options.
• 18. View Floor Temperature Key: Switches display to show floor temperature.
• 19. Current Temp: Displays the current sensor temperature.
• 20. Units of Temperature: Shows Celsius (°C) or Fahrenheit (°F).
• 21. Comfort Level Selection Keys: Used for comfort level setup.

Pairing the Thermostat

To pair the thermostat with the RC2-WTS receiver:

On the receiver:

• Press the Pair button once. The Communication LED will light up.

On the thermostat:

• Press [PROG] and then [SETUP].
• At the top of the LCD, '01' will appear.
• Use the [Up Arrow] key to select '05' and enter the pairing function.
• In the center of the LCD, '01' (channel address) will appear. This default can be used unless RF conflicts are detected.
• Use the [Up/Down Arrows] keys to enter the desired address.
• Press [SETUP] to pair the thermostat and receiver.

Pair Successful: The receiver's Comms LED will flash and then go out. The thermostat will display the communication icon.

Pair Fail: If the Comms LED does not flash, check the RF signal strength and ensure no metal objects are blocking it. Reduce the distance between the thermostat and receiver.

Note: Pairing must be completed before the receiver's communication LED turns off (after 1 minute).

Diagram Description: Visuals show the Heatmiser thermostat and the RC2-WTS receiver unit, highlighting the 'Comms LED' and the 'PAIRING' button on the receiver.

Setting the Clock

To set the clock:

• Press [PROG].
• Press [CLOCK].
• Use the [Down Arrow] key to set the hours.
• Use the [Up Arrow] key to set the minutes.
• Use the [DAY] key to set the day of the week.
• Press [DONE] to confirm and exit.

The display shows indicators for Day, Hours, Minutes, and prompts for changing Hours and Minutes.

Temperature Display

Temperature information is shown based on sensor measurements and the set target temperature.

Room Temperature: Displays the current room temperature.

Set Temperature: Displays the target temperature you wish to achieve.

When the thermostat is in air and floor sensing mode, a [FLOOR] button is available. Pressing it shows the current floor temperature; the display reverts to room temperature after 5 seconds.

Comfort Levels Explained

Comfort levels allow setting different temperatures throughout the day, for example, warmer mornings, cooler days, and warmer evenings. The thermostat supports two programming options:

• 5/2 Day Programming: 4 comfort levels for weekdays and 4 for weekends.
• 7 Day Programming: 4 comfort levels for each day, programmable independently.

Refer to pages 23-24 for switching between modes. If not all comfort levels are needed, set the time to '--:--'. Default comfort levels are pre-programmed but can be changed.

Default Comfort Levels:

Weekday:

• Wake: 07:00, 21°C
• Leave: 09:00, 16°C
• Return: 16:00, 21°C
• Sleep: 22:00, 16°C

Weekend:

• Wake: 09:00, 21°C
• Leave: 22:00, 16°C
• Return: --:--, --°C
• Sleep: --:--, --°C

Setting Comfort Levels:

• Press [PROG].
• Select [WAKE].
• Use [Up/Down Arrows] to set the WAKE period time.
• Use [Up/Down Arrows] to set the WAKE temperature.
• Repeat for LEAVE, RETURN, and SLEEP periods.
• Press [DAY] to select the next day to program and repeat.

In 5/2 Day mode, 'Sat Sun' prompts for weekend programming. In 7 Day mode, 'Tue' is displayed.

Press [DONE] to confirm settings and exit.

Clean Screen

Pressing the [SCREEN] key disables all keys for 15 seconds, allowing the screen to be wiped clean before keys are reactivated.

Locking the Keypad

The thermostat features a keypad lock.

• To activate, press and hold the bottom right corner of the display for 10 seconds. The [Keypad Lock Icon] will appear.
• To cancel, press and hold the bottom right corner again for 10 seconds.

Temperature Control

The [Up Arrow] and [Down Arrow] keys below the temperature display allow adjustment of the set temperature. When used, the temperature and 'SET' will appear on screen.

Select the desired temperature and press [DONE] to confirm. The new temperature is maintained only until the next programmed comfort level, after which the thermostat reverts to programmed levels.

The display shows 'Set Temperature' and a 'Set Icon'.

Temperature Hold

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

• Press [HOLD].
• Use the top set of [Up/Down Arrows] to set the hold period.
• Use the center set of [Up/Down Arrows] to set the hold temperature.
• Press [DONE] to confirm and exit.

The display shows 'Hold Icon', 'Hold Time', and 'Hold Temperature'.

To cancel a temperature hold, repeat the steps but set the time to 00:00.

Holiday

The holiday function reduces the set temperature to the frost protection setting for a specified duration. The thermostat automatically returns to the program mode upon your return.

• Press [HOLIDAY].
• Enter the desired duration in days.
• Press [DONE] to confirm settings and exit.

The display shows 'Holiday Icon' and 'Holiday Days'.

Note: A holiday period begins at 00:00 the following day. For example, a holiday set on Friday for 2 days counts Saturday as the first day, with the thermostat resuming its schedule on Monday at 00:00.

To cancel a holiday setting, reduce the duration to 00 days.

Frost Mode

Pressing the [Frost Icon] key activates 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 (see page 21). If heating is active in frost mode, the flame symbol will be displayed.

To cancel frost protect mode, press the [Frost Icon] key again.

The display indicates 'Frost Protection Mode Enabled'.

Heating On/Off

Heating is indicated by the [Flame Icon]. If the icon is absent, heating is not required to meet the set temperature, but the thermostat remains active.

To turn the thermostat off completely, press and hold the [Power] key. The display and heating output will turn off. To turn it back on, press the [Power] key once.

The display shows 'Thermostat completely OFF' or 'Thermostat powered ON'.

Optional Features Explained

The following settings are optional and generally do not require adjustment:

• Feature 01 – Temperature Format: Selects between °C or °F.
• Feature 02 - Switching Differential: Adjusts the switching differential. Default is 1°C (heating on 1°C below set temp, off at set temp). A 2°C differential means heating on 2°C below set temp.
• Feature 03 - Frost Protect: The temperature maintained in frost mode. Range: 07-17°C (Default: 12°C), suitable for most applications.
• Feature 04 – Output Delay: Prevents rapid switching; can be set from 00-15 minutes (Default: 00, no delay).
• Feature 05 – Pairing Function: Allows pairing with the receiver.
• Feature 06 - Fail Safe: If enabled, the thermostat signals the receiver every 20 minutes. If a signal is missed, the receiver activates the output for 20% of the time to protect against wireless signal loss or battery failure.
• Feature 07 – Optimum Start: Delays heating start-up to ensure the building is warm at the programmed time, optimizing energy use. It calculates heat-up time based on the rate of change.
• Feature 08 – Rate Of Change: The calculated time (in minutes) for the thermostat to raise the building temperature by 1°C. This feature learns home heat-up times for efficiency.
• Feature 09 - Programming Mode: Offers 5/2 Day (4 weekday/4 weekend levels) or 7 Day (4 levels per day) programming.
• Feature 10 – Floor Limit Temperature: Uses the floor limiting sensor to prevent overheating. The limit is set from the thermostat but stored in the receiver. If the RF link fails, the receiver limits the floor temperature. Adjustable from 20-45°C.

Adjusting the Optional Settings

To adjust optional settings:

• Press [PROG].
• Press [SETUP].
• Use the [Up/Down Arrows] at the top of the screen to select the feature number (refer to page 24).
• Use the [Up/Down Arrows] in the center to adjust the setting value.
• Press [DONE] to confirm and exit.

Optional Settings - Feature Table

Re-calibrating the Thermostat

To re-calibrate the thermostat:

• Press and hold the [Power] key to turn the thermostat off.
• Press and hold the [OFF] key until the temperature appears on the screen.
• Use the [Up/Down Arrows] to configure the new temperature.
• Press [DONE] to confirm the new temperature.
• Press the [Power] key once to turn the thermostat back on.

The display shows 'Calibration Temperature Setting' and a 'Set Icon'.

Factory Reset

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

To perform a factory reset:

• Press & hold the [Power] key to turn the thermostat display off.
• Press and hold the bottom left corner of the LCD for 10 seconds.
• All screen icons will appear for 2 seconds and then disappear.
• Press the [Power] key once to turn the thermostat display back on.

The display shows all icons simultaneously, indicating 'Factory reset is complete'.

Battery Recharging

The thermostat is equipped with a rechargeable battery that provides power for up to 6 months under normal operating conditions before recharging is needed.

To recharge, connect the thermostat to a power source using the supplied mini USB to USB lead. Recharging can be done via the USB port on a laptop or PC.

Diagram Description: An image shows a mini USB to USB cable (Part ref: USB-02). Another diagram illustrates the thermostat connected via USB to a laptop and a desktop computer for recharging.

Error Codes

The thermostat may display error codes:

• E0: The internal sensor has developed a fault. Contact your thermostat retailer for assistance.
• E4: The floor sensing probe to the RC2-WTS has either not been connected, has been wired incorrectly, or the probe is faulty.

The display shows 'Error Number' on the thermostat screen.

Notes

This section is for user notes.

Further Information

For Heating Professionals: Request a copy of the product installation guide, containing detailed technical specifications for the complete product range, at www.heatmiser.com/guide.

For More Information: Call the support team on +44 (0)1254 669090 or view technical specifications on the website: www.heatmiser.com.

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