iQe CS027, CS318, CS317 User Instructions

CS027

User Instructions

Battery Powered 7 Day Programmable

Room Thermostat

Programmable room thermostats are widely recognised as one
of the best ways in which to control central heating. The CS027
programmable room thermostat has a large display and intuitive
user interface, making it easy to set up and use. The CS027
uses a sophisticated time proportional integral (TPI) algorithm
for accurate temperature control and energy efficiency.

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What is a programmable room thermostat?

...an explanation for householders.

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 the 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 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 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 first, 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 adjustments above these settings 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 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 chose 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 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 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.

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Actual Room
Temperature

Day of
Week

Time of
Day

Until (Time)

Then (Temp)

Enter
Button

+ Button- ButtonBack

Button

Set
Temperature

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DISPLAY

CS027

DISPLAY

Actual Room Temperature This is the actual room temperature

measured by the CS027

Set Temperature This is the temperature that the CS027

will allow the room to reach. The
temperature range can be set between
5°C and 30°C

When the temperature shown in the
display is achieved the CS027 will
switch the heating OFF.

If the temperature in the room falls below
the setting the CS027 will switch the
heating ON.

Until (time) This is the time that the next

temperature setting is due to operate

Then (temp) This is the temperature setting that is

due to operate next

Day of the week It is important that the correct day of the

week shows in the display

Time of day This is the current time of day

Setting Buttons Press any button to illuminate the

display.

The message 'To override press -/+ To
see menu press ENTER' will appear

ACTIVATING THE BACK-LIT DISPLAY

Press any button to illuminate the display. This will remain illuminated for
10 seconds

GENERAL INFORMATION

During programming please note that the display will return to its normal
operating screen if the last button press exceeds 10 seconds.

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TEMPORARY OVERRIDE

A temporary temperature change can be made at any time. It is
also possible to extend how long this temperature override is in
operation.

The temperature will revert to its normal programmed setting at
the next timed temperature change

TEMPORARY OVERRIDE WITH TIME EXTENSION
(Maximum of 4 hours)

The temperature will revert to its normal programmed setting
at the next timed temperature change.

Press ‘-’ or ‘+’ to
adjust temperature

New temperature
setting will be shown
on the display

Press ‘-’ or ‘+’ to
adjust temperature

New temperature
setting will be
shown on the
display

Press ENTER

Press ‘+’ to
adjust the time

Press ENTER

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The hours of
the UNTIL time
will flash

PERMANENT OVERRIDE

In the 'HOLD' position the temperature can be overridden by
pressing either the '-' or '+' buttons. This will then become the
new 'HOLD' temperature

PERMANENT OVERRIDE – CANCELLATION

Press ‘-’ or ‘+’ to
adjust temperature

New temperature
setting will be
shown on the
display

Press ENTER

The hours of
the UNTIL time
will flash

Press ENTER

Press the '+'
repeatedly until
HOLD appears in
the display

Message will
appear briefly
confirming
'Temperature set
until manual
release'

Press BACK

Press ENTER

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SETTING UP THE CS027

Upon initial installation the CS027 has the following factory
default settings

Settings – Monday to Friday

Time Target Temperature

Period 1 06:00 am 20 °C

Period 2 08:30 am 18 °C

Period 3 11:30 am 20 °C

Period 4 01:30 pm 18 °C

Period 5 05:00 pm 21 °C

Period 6 10:00 pm 15 °C

Settings – Saturday and Sunday

Time Target Temperature

Period 1 07:00 am 20 °C

Period 2 10:00 am 19 °C

Period 3 11:30 am 21 °C

Period 4 01:30 pm 18 °C

Period 5 05:00 pm 21 °C

Period 6 11:00 pm 15 °C

These can be changed by the installer or the end user at any
time by accessing the MAIN MENU

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