Heatmiser JG PRT-E User manual

Operating Instructions
Model:
JG PRT-E
This is a multi mode thermostat,
please see page 13 for setup instructions
Revision 1 - 10/09
Ref: JGPRT-E

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Contents Page
What is a programmable thermostat? 2-4
Installation 5-6
Icons explained 6
Temperature Display 7
Setting the Clock 7
Setting the Comfort Levels 8-9
Keypad Lock Facility 9
Temperature Hold 10
Setting the Temperature 10
Holiday Feature 11
Turning the Heating On/Off 12
Factory Reset 12
Setting the Mode 13
Optional Thermostat Settings 14-19
Wiring 20-21

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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” 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 heat up depends on the design of the heating system,
the size of the boilers and radiators.
Neither does the setting affect how quickly the room cools

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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 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 way to set and use your programmable room thermostat is
to nd the lowest temperature setting 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.
If you 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

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(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 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 manufacturers instructions.
Programmable room thermostats need a free ow of air to
sense the temperature, so they must not be covered by
curtains or blocked 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 can 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
Place the thermostat front somewhere safe. Terminate the
thermostat as shown in the diagrams at the back of this
booklet.
Step 3
Clip the front of the thermostat to the back plate.
Icons Explained
Symbol Description
Heat On Icon
Shown when the heating is On
Flashing when the optimum starts 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 Set Temperature Icon
Shown when the floor set temperture is reached

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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.
Setting the Clock
To set the clock, follow the steps below:
• With the thermostat turned on, press the Clock button twice.
• You are now able to set the minutes using the Up/Down
keys.
• Press H to accept.
• You are now able to set the hours using the Up/Down keys.
• Press H to accept.
• You are now able to set the day of the week using the Up/
Down keys.
• Press A to store and exit.

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Comfort Levels Explained
The PRT-E provides Weekday/Weekend or 7 Day Programming.
You should consult the “Conguration Menu” section to select
the required mode.
The thermostat is supplied with comfort levels already
programmed, but these can be changed easily. The default
times are:
08.00 - 21°C (Wake)
09.30 - 16°C (Leave)
16.30 - 22°C (Return)
23.00 - 17°C (Sleep)
If you only want to use 2 levels, you should program the
unused levels to --.--
• To begin programming the comfort levels, press Clock Once.
• If your thermostat is setup for Weekday/Weekend
Programming, you will see Mon-Fri shown. For 7 day
programming you will see Monday.
• Using the Up/Down arrow keys, enter the required Wake
time.

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• Press H.
• Using the Up/Down arrow keys, enter the required Wake
Temperature.
• Press H.
• You will now see “Leave”.
• You should repeat the programming for each period,
entering --.—for unused periods.
Note: For weekday/weekend Programming, the 4 comfort
levels are the same for all weekdays. For 7 day programming,
each day can have 4 different comfort levels.
Locking The Thermostat
The thermostat has a key-lock facility. To enable follow these
steps:
• Press and hold the A and Down Key for 10 seconds.
• You will see the lock symbol appear.
• To unlock, repeat the steps above.

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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 H.
• Using the Up/Down arrow keys enter the required hold time.
• Press H.
• Using the Up/Down arrow keys enter the required hold
temperature.
• Press A to accept.
You will see the Hold indication is displayed which will
countdown the hold duration.
To cancel, reduce the Hold time to 00 hours.
Temperature Set
Using the Up or Down arrow 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 A to accept.

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Holiday
The PRT-E has a holiday function. This allows you to enter a
holiday setting. During a holiday, the thermostat will maintain
the frost set temperature. At the end of your holiday, the
thermostat will revert back to the programmed setting ensuring
that your home is warm on your arrival.
• Press H three times (Until you see the suitcase).
• Using the Up/Down arrow keys enter the number of days
holiday.
• Press A to accept.
The PRT-E will show a suitcase indicating the thermostat is in
holiday mode. To cancel, reduce the Holiday duration to 00
days.

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Heat On / Off
Frost Protect Mode: 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
temperature (see page 14) 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.
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 the thermostat off (See above).
• Press and hold the Power and Up arrow key until the LCD
powers up. All of the icons will be displayed. When they
have disappeared, the thermostat has been reset.

Setting The Mode
The PRT-E has 4 modes, these are explained below:
Mode No. Mode explanation
00 Non programmable mode with built in air sensor
01 Non programmable with remote sensor options
02 Programmable mode with built in air sensor
03 Programmable mode with remote sensor options
First select the best mode which suits your application, and
then follow the steps below to setup the thermostat:
1. Turn off the thermostat by pressing and holding the Power
button.
2. Press and hold the H key for 10 seconds.
3. Using the Up/Down keys, you should select the mode
required.
4. Press A to accept.
13

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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 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
almost all applications.

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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.
Feature 08 – Sensor Selection: This thermostat has a built in
air sensor. In mode 00 and 02 (as described on page 13), the
thermostat uses the built in air sensor and cannot be changed.
In modes 01 and 03 you have the option to select from the
following sensor options:
• 00 = Built in Air Sensor
• 01 = Remote Air Sensor
• 02 = Floor Sensor Only
• 03 = Floor Sensors & Built in Air Sensor
• 04 = Floor Sensor and Remote Air Sensor

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Feature 09 – Floor Limit: When the thermostat is operating
in mode 01 and 03 (as described on page 13) and function 08
is set to 02, 03 or 04, function 09 becomes available. You can
then set the maximum oor temperature limit - 20-45°C (28°C
default).
Feature 10 – Optimum Start: Optimum start will delay the
start up of the heating system to the latest possible moment to
avoid unnecessary heating, so that the dwelling is comfortably
warm by the programmed time. The thermostat uses the rate of
change (see below) setting to calculate how long the building
needs to take to raise the building 1°C (with a rate of change
of 20, the thermostat has calculated the building needs 20
minutes to raise the building 1°C).
Feature 11 – Rate of Change: For information only.
Feature 12 – Weekday/Weekend or 7 Day Programming:
The thermostat offers two programming methods. Weekday/
Weekend allows you to program 4 comfort levels for the
weekday and 4 different comfort levels for the weekend. In 7
day program mode, each day has 4 comfort levels that can be
programmed independently.

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Adjusting the Optional Settings
1. To access the conguration menu, turn off the thermostat
by pressing and holding down the Power Button. Then,
press and hold the Clock button until the display lights up.
2. The small number is the feature number, the large number is
the setting value.
3. Use the clock button to cycle through the features.
4. Use the Up/Down keys to change the setting.
5. Press A to accept and store.
Feature Table
Feature Description Setting
01 Temperature Format 00=°C
01=°F
02 Switching Differential 01-03°C
01°C Default
03 Frost Mode 00 = Enabled
01 = Disabled
(00 = Default)

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Feature Table (continued)
Feature Description Setting
04 Frost Temperature 07-17°C
(12°C Default)
05 Output Delay 00-15 Minutes
(00 Default)
06 Communication ID Set Unique Comms
Address 01-32
07 Up/Down Temp Limit 00-10°C
(00°C Default)
08 Sensor Selection
00 = Built In Air Sensor (Default)
01 = Remote Air Sensor
02 = Floor Sensor Only
03 = Floor Sensor and
Built In Air Sensor
04 = Floor Sensor and
Remote Air Sensor