Heatmiser PRT-E, PRT-EN Operating Instructions Manual

Operating Instructions

Model : PRT-E / PRT-EN

Installer Note:

This thermostat is a combination model allowing you to choose
between “Floor Only” or “Air & Floor” temperature control.
Please see page 11 for more information.

This product should be installed by a qualified electrician.
Improper installation may result in injury, death or
property damage.

Contents Table

Contents 1
What is a programmable thermostat 2-4
Installation 5-6
Initial Setup Procedure 7-12
Symbols Explained 13
Button Layout 14
Temperature Display 15
Setting the Clock 15
Temperature Override 16
Frost Mode 16
Setting the Comfort Levels 17-18
Keylock 19
Viewing the Floor Temperature 19

Wiring

PRT-E-N Mode 0 Wiring Diagrams 20-21
PRT-E-N Mode 1 Wiring Diagrams 22-23

1

2

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 effect how quickly the room cools down.
Turning a programmable room thermostat to a lower 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
find the lowest temperature settings that you are comfortable with
and 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 first, say 18ºC,
and then turn them up by one degree each day until you are
comfortable with the temperatures. You wont 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. 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.

The time on the programmer must be correct. Some types have to
be adjusted in spring and Autumn at the change between
Greenwich Mean Time and British Summer Time.

3

You may be able to temporarily adjust the heating programme, for
example “Override”, “Advance” or “Boost” These are explained in
the manufacturers instructions.

Programmable 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 prevent the thermostat from working properly.

4

Installation Procedure

DO’s

1. Mount the thermostat at eye level.

2. Read the instructions fully so that you get the best from our
product.

3. Install the floor probe into a conduit so that it can be replaced if

necessary.

DON’Ts

1. Do not install near a direct heat source as this will effect the
workings of the thermostat.

2. Do not push hard on the LCD otherwise you will damage the
liquid crystal display.

Installation

The thermostat is designed to be flush 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 flat head terminal driver in to the slots on
the bottom face of the thermostat.

5

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.

Step 4
Turn on the power to the thermostat and allow
the thermostat to stabilise for 1 hour before

calibrating.

6

7

How To Setup Your Thermostat

This thermostat has many options available to you. Once you have
set these settings you can leave them. They will be stored in the
thermostat memory and do not need to be adjusted.

You need to use the table opposite as a reference guide when
initially setting up the thermostat.

We strongly suggest you read the next few pages so that you fully
understand the features available and their intended use.

You should also understand that by enabling one feature, another
feature maybe made unavailable. This is because the feature is not
available in that mode.

Please read the features now, and then follow the setup routine

on the following pages.