Heatmiser DT-B User manual

Model: DT-B

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Model: DT-B

Model: DT-B
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Table of Contents
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3-4
5-6
7-9
10
11-12
13
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15
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16
17-19
20
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21-22
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Table of Contents
What is a Room Thermostat?
Installation Procedure
Installing the Batteries
Replacing the Batteries
LCD Display
Temperature Display
Locking the Thermostat
Temperature Control
Power ON / OFF
Frost Protection
Optional Features
Re-calibrating the Thermostat
Factory Reset
Wiring Diagrams

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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 and 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.

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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.

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Installation Procedure
This wireless thermostat is designed to be surface mounted.
Step 1
Carefully separate the front half of the thermostat from the back plate by placing a
small flat head terminal driver into the slots on the bottom face of the thermostat.
Step 2
Mark 2 hole positions on the wall using the back plate as a positioning template.
Drill the marked positions and insert a wall plug into each hole. Terminate the
thermostat as shown in the diagrams on pages 21-22 of this booklet.
Step 3
Screw the thermostat back plate securely on the wall and fit the terminal cover.
Step 4
Clip the front of the thermostat back onto the thermostat back plate.
Do
Mount the thermostat at eye level.
Read the instructions fully so you get the best from our product.
Don’t
Do not install near to a direct heat source as this will affect functionality.
Do not push hard on the LCD screen as this may cause irreparable damage.

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Model: DT-B
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Installing the Batteries
2x AAA batteries have been supplied with this thermostat.
To access the battery holder, push and release the compartment door located on
the bottom face of the thermostat.

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Insert the batteries in the empty battery holder, ensuring that each battery is
orientated for the correct polarity + / - .

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Push the battery holder back inside the thermostat until it is secured
in its closed position.

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Replacing the Batteries
Batteries have a fixed lifespan and will need to be replaced occasionally to
ensure the thermostat operates correctly.
The thermostat will inform you when the batteries need to be replaced by
displaying the battery icon on screen.
Battery Icon
(Flashes)

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87654
1 2 3

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1. Room Temp - Indicates the current temperature sensor mode.
2. Frost Icon - Displayed when the thermostat is in frost protection mode.
3. Flame Icon - Displayed when the thermostat is calling for heat.
4. Set - Displayed when the target temperature is adjusted.
5. Current Temp - Indicates the current sensor temperature.
6. Battery Level - Indicates when the batteries require replacement.
7. Keypad Lock Indicator - Displayed when the keypad is locked.
8. Units of Temperature - Degrees Celsius or Fahrenheit.
LCD Display

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Temperature Display
Room Temperature Set Temperature
This is the current room temperature. This is the temperature you are trying to
achieve in your home.
The temperature display information is driven by two different inputs; the sensor
measurement and the target temperature you have set.

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Locking the Thermostat
The thermostat has a keypad lock facility. To activate the lock follow these steps.
• Press and hold the A and Down keys together for 10 seconds .........
• You will see the lock symbol appear on screen .............................................
• To unlock, repeat the steps above until the lock symbol disappears.
Note: The keypad lock indicator is only displayed when the lock is active.
Keypad Lock Indicator

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Temperature Control
The Up/Down keys allow you to adjust the set temperature .......................
When you press either of these keys, you will see the word SET and the desired
temperature will be displayed on screen.
Use the Up/Down keys to adjust the SET value .................................................
Press A to confirm settings and return to main display .............................................
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.*
Press the Power button once to turn the thermostat back ON .................................
*See Feature 3 on page 17

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Pressing the button 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 17).
Should the heating be turned on whilst in frost mode, the flame icon will
be displayed.
To cancel the frost protect mode, press the button once.
Frost Mode
Frost Protection Mode Enabled

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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 and °F.
Feature 02 – Switching Differential: This function allows you to increase the switching
differential of the thermostat. The default is 1°C which means that with a set temperature
of 20°C, the thermostat will switch the heating on at 19°C and off at 20°C.
With a 2°C differential, the heating will switch on at 18°C and off at 20°C.
Feature 03 – Frost Protect: You can set whether the thermostat will maintain the frost
temperature when the thermostat display is turned off. As a default, this is enabled.
Feature 04 – 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 05 – Output Delay: To prevent rapid switching, and output delay can be entered.
This can be set from 00 - 15 minutes. The default is 00 which means there is no delay.
Feature 06 – Temperature Up/Down Limit: This function allows you to limit the use of
the Up and Down keys. This limit is also applicable when the thermostat is locked and so
allows you to give others limited control over the heating system.
Optional Features Explained

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Adjusting the Optional Settings
To adjust the optional settings, follow these steps.
• Press and hold the Power button to turn the thermostat OFF ..............................
• Press and hold the Clock key until the display appears as shown below ..........
• Use the Clock key to cycle through the features .........................................................
• Use the Up/Down keys to change the setting ...................................................
• Press A to confirm settings .................................................................................................
• Press the Power button once again to turn the thermostat back ON .................
Setting Value
Feature Number

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Optional Settings - Feature Table
Temperature Format
Switching Differential
Frost Mode
Frost Protection Temperature
Output Delay
Up/Down Temperature Limit
DESCRIPTIONFEATURE
00 = °C
01 = °F
(°C = Default)
01° - 03°C
(01°C = Default)
00 = Enabled
01 = Disabled
(00 = Default)
07° - 17°C
(12°C = Default)
00 - 15 Minutes
(00 = Default)
00° - 10°C
(00°C = Default)
SETTING
01
02
03
04
05
06