Heatmiser DT User manual

1
Model: DT / DT-N
Model: DT / DT-N

2
Slimline Series
2Model: DT / DT-N
Model: DT / DT-N
Slimline Series1
Table of Contents
1
2
3-4
5-6
7-8
9
10
11
12
13
14-16
17
17
18-22
Product Image
Table of Contents
What is a Room Thermostat?
Installation Procedure
LCD Display
Temperature Display
Locking the Thermostat
Setting the Temperature
Frost Protection
Power On / O
Optional Features
Re-calibrating the Thermostat
Factory Reset
Wiring Diagrams

43
Slimline Series Model: DT / DT-N
What is a Room Thermostat?
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 dierent 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 ow of air to sense the temperature, so they must not
be covered by curtains or blocked by furniture. Nearby electric res, televisions, wall
or table lamps may also prevent the thermostat from working properly.
A room thermostat simply switches the heating system on and o 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 o 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 aect how quickly the room cools
down. Setting a programmable 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 nd 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.

65
Slimline Series Model: DT / DT-N
1
Installation Procedure
This Slimline Series thermostat is designed to be ush mounted and requires a back
box of 35mm (minimum depth) to be sunk into the wall prior to installation.
Step 1
Carefully separate the front half of the thermostat from the back plate by placing a
small at head terminal driver into the slots on the bottom face of the thermostat.
Step 2
Place the thermostat front somewhere safe.
Terminate the thermostat as shown in the diagrams on pages 18-22 of this booklet.
Step 3
Screw the thermostat back plate securely into the back box.
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 aect functionality.
Do not push hard on the LCD screen as this may cause irreparable damage.
2
3 4

87
Slimline Series Model: DT / DT-N
123
4 5 6 7
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, the ame icon
will ash when the optimum start function is in operation.
4. Set - Indicates when changes are being made to programs or temperature set
points.
5. Current Temp - Indicates the current sensor temperature.
6. Keypad Lock Indicator - Displayed when the keypad is locked.
7. Units of Temperature - Degrees Celsius or Fahrenheit.
LCD Display

109
Slimline Series Model: DT / DT-N
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 dierent inputs; the sensor
measurement and the target temperature you have set.
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.
Keypad Lock Indicator
Note: The keypad lock indicator is only displayed when the lock is active.

1211
Slimline Series Model: DT / DT-N
Temperature Control
The Up/Down keys allow you to adjust the set temperature .......................
When you press either key, 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 conrm settings and return to main display .............................................
Set Temperature
Set Icon
Pressing the Power 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 14).
Should the heating be turned on whilst in frost mode, the ame icon will be displayed.
To cancel the frost protect mode, press the Power button once again.
Frost Protection Mode Enabled
Frost Mode

1413
Slimline Series Model: DT / DT-N
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 and °F.
Feature 02 – Switching Dierential: This function allows you to increase the switching
dierential 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 o at 20°C. With a 2°C
dierential, the heating will switch on at 18°C and o at 20°C.
Feature 03 – Frost Protect: You can set whether the thermostat will maintain the frost
temperature when the thermostat display is turned o. 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, 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 06 – Communication Address: This setting is used when you have connected
your thermostat to a network system. Each thermostat on your network must have a
unique communication address. This can be set from 01-32.
Feature 07 – Temperature Up/Down Limit: This function allows you to limit the use of
the up and down temperature arrow keys. This limit is also applicable when the
thermostat is locked and so allows you to give others limited control over the heating
system.
Thermostat completely OFF Thermostat powered ON
Heating On/O
The heating is indicated ON when the ame icon is displayed.
When the ame 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 14

1615
Slimline Series Model: DT / DT-N
Optional Settings - Feature Table
01
02
03
04
05
06
07
FEATURE
Temperature Format
Switching Dierential
Frost Mode
Frost Protection Temperature
Output Delay
Communications ID No.
Up/Down Temperature Limit
DESCRIPTION
00 = oC
01 = oF
(°C = Default)
01o- 03oC (01oC = Default)
00 = Enabled
01 = Disabled
(00 = Default)
07o- 17oC (12oC = Default)
00 - 15 Minutes (00 = Default)
Set unique coms address 01-32
00o- 10oC (00 = Default)
SETTING
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 button until the display appears as shown below ...
• Use the Clock button to cycle through the features .................................................
• Use the Up/Down keys to change the setting ....................................................
• Press A to conrm settings .................................................................................................
• Press the Power button once to turn the thermostat back ON .............................
Setting Value
Feature Number

1817
Slimline Series Model: DT / DT-N
TO CONNECT BOILER CONSULT
BOILER MAKERS DIAGRAM
NEUTRAL
LIVE
230V SUPPLY IN
230V AC 50/60Hz
SWITCHED LIVE TO BOILER
DT
A1A2 LN
230VAC
Wiring Diagram - DT 240V Switching
Re-calibrating the Thermostat
If you need to re-calibrate the thermostat, follow these steps.
• Press and hold the Power button to turn the thermostat OFF ...........................
• Press and hold BOTH the Power and Down keys together until the
temperature appears on the screen ........................................................................
• Use the Up/Down keys to congure the new temperature ...........................
• Press A to conrm settings ..............................................................................................
• Press the Power button once to turn the thermostat back ON .........................
Factory Reset
To perform a factory reset, follow these steps.
• Press and hold the Power button to turn the thermostat OFF ...........................
• Press and hold the Power and Up keys together until the LCD powers up.
All of the icons will be displayed on screen ............................................................
• When the icons have disappeared from the screen, the thermostat has
been successfully reset.
• Press the Power button once to turn the thermostat back ON ..........................
The thermostat has a reset function to restore all settings to their factory defaults.
THIS UNIT MUST BE PROTECTED BY A FUSE OR RCD

2019
Slimline Series Model: DT / DT-N
Wiring Diagram - DT Voltfree Switching
TO CONNECT BOILER CONSULT
BOILER MAKERS DIAGRAM
NEUTRAL
LIVE
LS
LR
230V SUPPLY IN
LS & LR ARE NORMALLY THE
ROOM THERMOSTAT CONNECTIONS
VOLT FREE TO BOILER
230V AC 50/60Hz
DT
A1A2 LN
230VAC
Wiring Diagram - DT to Valve
TO CONNECT BOILER CONSULT
BOILER MAKERS DIAGRAM
L
N
LS
LR
LS & LR ARE NORMALLY THE
ROOM THERMOSTAT CONNECTIONS
TO BOILER
HEATING VALVE
NEUTRAL
NEUTRAL
LIVE
230V SUPPLY IN
230V AC 50/60Hz
DT
A1A2 LN
230VAC
THIS UNIT MUST BE PROTECTED BY A FUSE OR RCD THIS UNIT MUST BE PROTECTED BY A FUSE OR RCD

2221
Slimline Series Model: DT / DT-N
Wiring Diagram - DT-N to PRC Volt Free Switching
12V
COMMS
CABLE
Voltfree Switching With the Heatmiser PRC
A2 B2
NONCCNONCCNEL
230V SUPPLY IN Volt Free Output
POWERED RELAY CARD
+
_
Recommendations
Max Cable Size - 1.5MM
Back Box Depth - 35MM
Max Load - 3 Amps
For 230V switched live
output, link mains L to C
DT-N
RT2 RT1 -A2 A1 + Y B
Network
12VDC
Wiring Diagram - DT-N to UH1
COMMS
CABLE
DT-N
RT2 RT1 -A2 A1 + Y B
Network
12VDC
UH1
ZONE X
A2
A1
B
Y
_
+
ZONE X
A2
A1
B
Y
_
+
Connecting DT-N to the UH1
The UH1 allows connection of up to eight
12 volt network thermostats.
When connecting network thermostats
to the UH1 use CAT5-FTP or BELDEN 9538.
Connect the screen to Earth at the UH1.

23
Slimline Series
Video
Twitter: heatmiseruk
Facebook:
facebook.com/thermostats
Want More Information?
Call our support team on: [phone]
Or view technical specications directly on our website:
www.heatmiser.com
PDF FAQ
Heating Professionals:
Request a copy of our product
installation guide containing
detailed technical specications
for our complete product range:
www.heatmiser.com/guide