Heatmiser DT-WTS Wireless Thermostat

What is a Room Thermostat?

A room thermostat simply switches the heating system on and off as necessary. It works by sensing the air temperature, switching on the heating when the air temperature falls below the thermostat setting, and switching it off once this set temperature has been reached.

Setting a room thermostat to a higher temperature will not make the room heat up any faster. How quickly the room heats up depends on the design & size of the heating system.

Similarly, reducing the temperature setting does not affect how quickly the room cools down. Setting a room thermostat to a lower temperature will result in the room being controlled at a lower temperature, and saves energy.

The way to set and use your room thermostat is to find the lowest temperature settings that you are comfortable with, and then leave it alone to do its job. The best way to do this is to set the room thermostat to a low temperature, say 18°C, and then turn it up by 1°C each day until you are comfortable with the temperature. You won't have to adjust the thermostat further. Any adjustment above this setting will waste energy and cost you more money.

If your heating system is a boiler with radiators, there will usually be only one room thermostat to control the whole house. But you can have different temperatures in individual rooms by installing thermostatic radiator valves (TRVs) on individual radiators.

If you don't have TRVs, you should choose a temperature that is reasonable for the whole house. If you do have TRVs, you can choose a slightly higher setting to make sure that even the coldest room is comfortable, then prevent any overheating in other rooms by adjusting the TRVs.

Room thermostats need a free flow of air to sense the temperature, so they must not be covered by curtains or blocked by furniture. Nearby electric fires, televisions, wall or table lamps may also prevent the thermostat from working properly.

Installation Procedure

Do

• Mount the thermostat at eye level.
• Read the instructions fully so you get the best from our product.

Don't

• Do not push hard on the LCD screen as this may cause irreparable damage.
• Do not install near to a direct heat source as this will affect functionality.
• If using the desk stand, ensure the thermostat 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. Step A: Remove the thermostat from the wall plate.
2. Step B: Release the desk stand.

Visual Description: Diagram 1 shows a wall plate being attached to a wall with screws. Diagram 2 illustrates the thermostat unit being clicked onto the wall plate. Diagram A depicts the thermostat being detached from its wall plate. Diagram B shows the integrated desk stand being deployed from the back of the thermostat.

LCD Display

Visual Description: Diagram of the thermostat's LCD screen, detailing elements such as Zone 1 and Zone 2 indicators, Frost Icon (❄️), RF Icon (?), Flame Icon (?), Keypad Lock Icon (?), Zone Indicator, Battery Icon (?), Room Temperature display, Set indicator, Clean Screen button, Power/Cancel button, PROG/DAY button, SCREEN button, SETUP button, DONE button, Up/Down arrow keys, Current Temperature display, and Units (°C/°F).

• 1. Frost Icon (❄️): Displayed when the thermostat is in frost protection mode.
• 2. RF Icon (?): Flashes when the thermostat communicates with the receiver.
• 3. Flame Icon (?): Displayed when the thermostat is calling for heat.
• 4. Keypad Lock Icon (?): Displayed when the keypad is locked.
• 5. Zone Indicator: Displays which zone on the RC1-WTS the thermostat is linked to.
• 6. Battery Icon (?): Indicates current battery charge level.
• 7. Room Temp: Indicates the current temperature sensor mode.
• 8. Set: Indicates when changes are being made to programs or temperature set points.
• 9. Clean Screen: Freezes screen temporarily to enable cleaning.
• 10. Power: Single press to enable/disable frost protection or press and hold to turn off display. Cancel: used to exit setup/program operations.
• 11. Setup/Programming Keys: Used to navigate setup options.
• 12. Up/Down Keys: Increase or decrease values shown on bottom digit group.
• 13. Current Temp: Indicates the current sensor temperature.
• 14. Units of Temperature: Degrees Celsius or Fahrenheit.

Pairing the Thermostat

To pair the thermostat with the RC1-WTS receiver, follow these steps.

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, you will see 01.
• Use the Up key to select 05 and enter the pairing function.
• Press Zone 1 or Zone 2 to select the relevant zone (Two DT-WTS can work with a single receiver, offering a two zone system).
• In the centre of the LCD, you will see 01. This is the channel address. The default setting of 01 can be used in most cases, but should be changed when a conflict is detected with other RF devices.
• Use the Up/Down keys to enter the address.
• Press SETUP to Pair the thermostat and receiver.

Note: You must finish pairing the thermostat before the communication LED goes out.

Pair Successful

The Comms LED on the receiver should flash and then go out to indicate the pair is successful. The thermostat will display the communication icon.

Pair Fail

If the Comms LED does not flash, there is a problem with the RF signal and you should reduce the distance between the thermostat and receiver. Where possible, ensure there are no metal objects blocking the signal. The LED will automatically go out after 1 minute.

Visual Description: Diagram of the Heatmiser thermostat and the RC1-WTS receiver. The receiver unit shows indicator lights for Power, Zone 1, Zone 2, and Comms, with the Comms LED highlighted.

Temperature Display

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

Room Temperature

This is the current room temperature.

SET Temperature

This is the temperature you are trying to achieve in your home.

Clean Screen

Pressing the [SCREEN] button will disable all keys, providing you 15 seconds to wipe the screen clean before the keys are re-activated.

Locking the Keypad

The thermostat has a keypad lock facility.

• To activate the lock, press the bottom right corner of the display and hold for 10s.
• When activated, you will see the Keypad Lock Icon (?).
• To cancel, press the bottom right corner of the display again for 10 secs.

Visual Description: Two diagrams illustrating temperature display modes: 'Room Temperature' showing the current ambient temperature (e.g., 22.8°C), and 'SET Temperature' showing the desired target temperature (e.g., 25°C). A separate diagram shows the Keypad Lock Icon (?) displayed on the thermostat screen.

Temperature Control

The [Up Arrow] and [Down Arrow] keys under the temperature display allow you to adjust the set temperature. When you press either of these keys, you will see the temperature and the word SET appear on screen. Select the desired temperature and press [DONE] to confirm and exit.

Frost Mode

Pressing the [SCREEN] key once will place the thermostat in frost protect mode. In this mode, the thermostat will display the Frost Icon (❄️) and will only turn the heating on should the room temperature drop below the set frost temperature (see page 16). Should the heating be turned on whilst in frost mode, the Flame Icon (?) will be displayed. To cancel the frost protect mode, press the [SCREEN] key once.

Visual Description: Diagram showing the thermostat's temperature adjustment interface, with Up/Down arrow keys below the temperature display. Another diagram shows the thermostat in 'Frost Protection Mode Enabled', displaying the Frost Icon (❄️) and the current room temperature (e.g., 22.0°C).

Heating On/Off

The heating is indicated ON when the Flame Icon (?) is displayed. When the Flame Icon is absent, there is no requirement for heating to achieve the set temperature, but the thermostat remains active.

To turn the thermostat OFF completely, press and hold the [Power Button]. The display and heating output will be turned off completely.

To turn the thermostat back ON, press the [Power Button] once.

Visual Description: Images of the Heatmiser thermostat. One shows the thermostat in a 'completely OFF' state with a blank screen. The other shows the thermostat 'powered ON' with its active display showing the zone and current room temperature.

Optional Features Explained

THE FOLLOWING SETTINGS ARE OPTIONAL AND IN MOST CASES NEED NOT BE ADJUSTED:

• Feature 01 – Temperature Format: This function allows you to select between °C or °F.
• Feature 02 - Switching Differential: This function allows you to increase the switching differential of the thermostat. The default is 1°C, which means the thermostat will switch the heating on 1°C below the set temperature and will turn it off when the set temperature is achieved. With a 2°C differential, the heating will switch on 2°C below the set temperature and will switch off when the set temperature is achieved.
• Feature 03 – Frost Protect Temperature: This is the temperature maintained when the thermostat is in frost mode. The range is 07-17°C. The default is 12°C and is suitable for most applications.
• Feature 04 – Output Delay: To prevent rapid switching, an output delay can be entered. This can be set from 00 - 15 minutes. The default is 00, which means there is no delay.
• Feature 05 – Pairing Function: Allows the thermostat to be paired with the receiver.
• Feature 06 - Fail Safe: If enabled, the thermostat will send a signal to the receiver every 20 minutes. Should the receiver fail to receive the signal from the thermostat, the receiver will activate the output for 20% of the time. This is to protect the system against a loss of wireless signal or in case the thermostat battery fails whilst you are away.

Adjusting the Optional Settings

To adjust the optional settings, follow these steps:

1. Press PROG.
2. Press SETUP.
3. Use the Up/Down keys at the top of the screen to select the feature number (shown on page 18) and then use the Up/Down keys in the center to adjust the setting.
4. Press DONE to confirm settings and exit.

Visual Description: Diagram illustrating the process of adjusting optional settings on the thermostat, showing fields for 'Feature Number' and 'Setting Value'.

Optional Settings - Feature Table

Re-calibrating the Thermostat

If you need to re-calibrate the thermostat, follow these steps:

1. Press and hold the [Power Button] to turn the thermostat OFF.
2. Press and hold the [CANCEL] key until the temperature appears on screen.
3. Use the [Up Arrow]/[Down Arrow] keys to configure the new temperature.
4. Press [DONE] to confirm settings.
5. Press the [Power Button] once to turn the thermostat back ON.

Visual Description: Diagrams depicting thermostat operations: one shows the screen during 'Calibration Temperature' adjustment, and another shows the screen during a 'Factory Reset', where all icons appear simultaneously before disappearing.

Factory Reset

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

To perform a factory reset, follow these steps:

1. Turn the thermostat OFF by pressing and holding the [Power Button].
2. Press and hold the bottom left corner of the LCD for 10 seconds.
3. All of the screen icons will appear for 2 seconds and then disappear.
4. Press the [Power Button] once to turn the thermostat back on.

Visual Description: Diagrams depicting thermostat operations: one shows the screen during 'Calibration Temperature' adjustment, and another shows the screen during a 'Factory Reset', where all icons appear simultaneously before disappearing.

Battery Recharging

The thermostat is equipped with a rechargeable battery. The battery can provide power for up to 6 months before recharging is required in normal operating conditions.

To recharge the battery, you need to connect the thermostat to a power source. A mini USB to USB lead is supplied with the thermostat, so you can recharge from the USB port on your laptop or PC.

Visual Description: An image of a mini USB to USB cable. A diagram illustrates the thermostat being recharged by connecting it via USB to a laptop and a desktop PC.

Further Information

Heating Professionals:

Request a copy of our product installation guide containing detailed technical specifications for our complete product range: www.heatmiser.com/guide

Want More Information?

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

Or view technical specifications directly on our website: www.heatmiser.com