Heatmiser PRT-ETS User manual

Operating Instructions
Model:
PRT-ETS / PRT-ENTS (EU)
This thermostat allows you to select between 5 sensor modes.
• Built in Air Sensor
• Remote Air Sensor
• Floor Sensor
• Floor Sensor & Built in Air Sensor
• Floor Sensor & Remote Air Sensor
To select the correct mode for your system,
please read pages 16-22
11/10 Revision 1
Ref: TS2EU

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Contents Page
Display Symbols Explained 2
Temperature Display 8
Setting the Clock 8
Comfort Levels Explained 9
Locking the Keypad 12
Temperature Override 12
Temperature Hold 13
Holiday 13
Heat On/Off 14
Clean Screen 14
Factory Reset 15
Optional Feature Setup 16-22
Error Codes 22
Wiring Diagrams 23-26

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Display Symbols Explained
Symbol Description
Heat On Icon
Shown when the heating is On
Flashing when the optimum start is in operation
Frost On Icon (Heating Off)
Shown when the heating is switched off and is
protecting against frost only
Keylock Icon
Shown when the keypad is locked
Floor Temperature Reached
Shown when the floor temperature is reached
(Floor and Air Sensor Mode Only)

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What is a programmable room thermostat?
A programmable room thermostat is both a programmer
and a room thermostat. A programmer allows you to set
“On” and “Off” time periods to suit your own lifestyle. A
room thermostat 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.
So, a programmable room thermostat lets you choose what
times you want the heating to be on, and what temperature
it should reach while it is on. It will allow you to select
different temperatures in your home at different times of the
day (and days of the week) to meet your particular needs.
Turning a programmable room thermostat to a higher setting
will not make the room heat up any faster. How quickly
the room heats up depends on the design of the heating
system, for example, the size of the boiler and radiators.
Neither does the setting affect how quickly the room cools
down. Turning a programmable room thermostat to a lower

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setting will result in the room being controlled at a lower
temperature, and saves energy.
The way to set and use your programmable room
thermostat is to nd the lowest temperature settings that
you are comfortable with at the different times you have
chosen, and then leave it alone to do its job.
The best way to do this is to set low temperatures rst, say
18ºC, and then turn them up by one degree each day until
you are comfortable with the temperatures. You won’t have
to adjust the thermostat further. Any adjustment above
these setting will waste energy and cost you more money.
If your heating system is a boiler with radiators, there
will usually be only one programmable room thermostat
to control the whole house. 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

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even the coldest room is comfortable, then prevent any
overheating in other rooms by adjusting the TRVs.
The time on the programmer must be correct. Some types
have to be adjusted in spring and autumn at the changes
between Greenwich Mean Time and British Summer Time.
You may be able to temporarily adjust the heating
programme, for example, “Override”, “Advance” or “Boost”.
These are explained in the manufacturer’s instructions.
Programmable 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 prevent the thermostat
from working properly.

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Installation Procedure
DO’s
1. Do mount the thermostat at eye level.
2. Do read the instructions fully so that you get the best
from our product.
DON’Ts
1. Do not install near a direct heat source as this will affect
the workings of the thermostat.
2. Do not push hard on the LCD otherwise you will damage
the liquid crystal display and this is not repairable.
Installation
The thermostat is designed to be ush mount, a back
box of 35mm should have been sunk in 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 in to
the slots on the bottom face of the thermostat.

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Step 2
Carefully unplug the ribbon connector which is plugged in to
the front half of the thermostat.
Place the thermostat front half somewhere safe. Terminate
the thermostat as shown in the diagrams at the back of this
booklet.
Screw the thermostat back plate on to the back box
Step 3
Re-connect the thermostat ribbon cable and clip the two
halves together.

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Temperature Display
Room Temp = This is the current room temperature.
SET = This is the temperature you are trying to achieve in
your home.
Floor = This is the temperature of the oor. When the
thermostat is in air and oor sensing mode, the thermostat
shows a “Floor” button. Pressing this allows you to view
the current oor temperature – pressing again will return the
thermostat to the room temperature display.
Setting The Clock
To set the clock in your thermostat, follow the steps below:
• With the thermostat turned on, press PROG
• Press Clock Use to set the correct Time
• Press Day to set the correct Day
• Press Done to accept and store

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Comfort Levels Explained
Comfort levels allow you to set different temperatures
throughout the day. For example, you may want the home
warm in the morning when you are getting ready for work,
cooler during the day when the house in unoccupied and
then warmer in the evening when you are home relaxing.
The thermostat offers 5/2 Day Programming (4 levels for
the weekday, 4 for the weekend) and 7 day Programming (4
levels for each day). See pages 16-22 for details on how to
switch between modes.
Tip! If you don’t want to use all of the comfort levels, just
set the time to --.—and the thermostat will ignore this
setting.

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Factory Programmed Comfort Levels
The following comfort levels are programmed already,
however you can change them easily.
Weekday Level Time Temp
Wake 07.00 21°C
Leave 09.00 16°C
Return 16.00 21°C
Sleep 22.00 16°C
Weekend Level Time Temp
Wake 09.00 21°C
Leave 22.00 16°C
Return --.-- --°C
Sleep --.-- --°C

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Changing the Comfort Levels
• Press PROG and select Wake.
• Use to set the time for the 1st Comfort level.
• Use to set the temperature in °C.
• You should now repeat for the Leave, Return & Sleep
levels.
• Press Day to select the next day. In 5/2 day mode the
thermostat will highlight “Sat Sun” prompting you to
program the temperature levels for the weekend. In 7 day
mode, the thermostat will highlight Tuesday.
• When complete, press Done to Store and Exit.

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Locking the Keypad
The thermostat has a keylock facility. To enable this press
the bottom right corner of the display and hold for 10
seconds
When activated, you will see .
To cancel, repeat the steps above.
Temperature Override
Using the keys allows you to adjust the set
temperature. When you press either of these keys, you will
see the word SET and the desired temperature. Press Done
to accept.
Note: You should note that this new temperature is
maintained only until the next programmed comfort level. At
this time, the thermostat will revert back to the programmed
levels.

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Temperature Hold
The Temperature Hold function is ideal for parties or when
you will be going out for a number of hours. It allows you to
hold a temperature for a desired period.
• Press HOLD
• Set the desired Hold time and temperature
• Press Done
• To cancel a Hold time, reduce the time to 00.00
Holiday
The Holiday function reduces the set temperature in your
home to the frost temperature setting. The thermostat will
maintain this temperature for the duration of the holiday and
will then automatically return to the program mode on your
return.
• Press HOLIDAY
• Enter the duration of your holiday
• Press Done
• To cancel a Holiday, reduce the Holiday time to 00 days.

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Heat On / Off
Frost Protect Mode: Pressing the Off 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 pages 16-22). Should the heating
be turned on whilst in frost mode, the ame symbol will be
displayed. To cancel the frost protect mode, press the On
button.
Thermostat Off: To turn the thermostat off completely,
press and hold the Off button. The display and heating
output will be turned off. To turn the thermostat back on,
press the On button.
Clean Screen
Pressing Clean Screen will disable all buttons, allowing you
15 seconds to wipe the screen clean.

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Factory Reset
The thermostat has a factory reset function. This will reset
all settings back to their factory default.
To perform a factory reset, follow these steps:
Turn off the thermostat by pressing the off button. Press
and hold the bottom left corner of the LCD for 10 seconds.
You will see all the icons appear for 2 seconds and then
disappear. The thermostat has then been reset to the
factory defaults.

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THE FOLLOWING SETTINGS ARE OPTIONAL
AND IN MOST CASES NEED NOT BE ADJUSTED
Optional Features Explained
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: You can set whether the
thermostat will maintain the frost temperature when
the thermostat display is turned off. As a default, this is
enabled.

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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 almost all 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 the 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.

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Feature 08 – Sensor Selection: This thermostat offers 5
sensor modes.
00 = Built in air sensor. In this mode, the thermostat will
maintain the set temperature by monitoring the built in air
sensor.
01 = Remote air sensor. In this mode, the thermostat will
maintain the set temperature by monitoring the remote air
sensor.
02 = Floor sensor. In this mode, the thermostat will
maintain the set temperature by monitoring the remote oor
temperature.
03 = Floor sensor and built in air sensor. In this mode, the
thermostat will maintain the set temperature by monitoring
the built in air sensor and will also ensure the oor surface
doesn’t overheat by monitoring the remote oor sensor.
04 = Floor sensor and remote air sensor. In this mode, the
thermostat will maintain the set temperature by monitoring
the remote air sensor and will also ensure the oor surface
doesn’t overheat by monitoring the remote oor sensor.