Heatmister PRTHW User manual

1
Model: PRTHW / PRTHW-N
Model: PRTHW / PRTHW-N

2
Slimline Series
2
Model: PRTHW / PRTHW-N
Table of Contents
1
2
3-4
5-6
7-8
9
10
11-12
13
14
Product Image
Table of Contents
What is a Programmable
Room Thermostat?
Installation Procedure
LCD Display
Setting the Clock
Temperature Display
Setting the Comfort Levels
Locking the Thermostat
Setting the Temperature
Model: PRTHW / PRTHW-N
Slimline Series1
Temperature Hold
Holiday Programming
Frost Protection
Power On / O
Setting the Hot Water
Switching Times
Hot Water Override
Optional Features
Re-calibrating the Thermostat
Factory Reset
Wiring Diagram
15
16
17
18
19
20
21-24
25
26
27-29

43
Slimline Series Model: PRTHW / PRTHW-N
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 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
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.
You are able to temporarily adjust the heating program by overriding or using the
temperature hold feature. These features are explained further on pages 14 and 15 of
this manual.
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 also prevent the thermostat from working
properly.
What is a Programmable Room Thermostat?
A programmable room thermostat is both a programmer and a room thermostat.
The programmer allows you to set “On” and“O” periods to suit your own lifestyle.
The room thermostat 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.
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
dierent temperatures in your home at dierent times of the day (and days of the week)
to meet your particular needs and preferences.
Setting a programmable 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 programmable room thermostat is to nd the lowest
temperature settings that you are comfortable with at the dierent times you have
chosen, and then leave it alone to do its job.

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Slimline Series Model: PRTHW / PRTHW-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 27-29 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

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Slimline Series Model: PRTHW / PRTHW-N
1. Room Temp - Indicates the current temperature sensor mode.
2. Day Indicator - Displays the current day.
3. Frost Icon - Displayed when the thermostat is in frost protection mode.
4. Flame Icon - Displayed when the thermostat is calling for heat, the ame icon
will ash when the optimum start function is in operation.
5. Temperature Hold - When a Temp Hold is active, HOLD FOR and the remaining
time period is displayed.
6. Set - Indicates when changes are being made to programs or temperature set
points.
7. Holiday Indicator - Displayed when the thermostat is in holiday mode.
8. Current Temp - Indicates the current sensor temperature.
9. Program Cycle Indicator - Displayed during programming only to show which
period is being altered.
10. Keypad Lock Indicator - Displayed when the keypad is locked.
11. Units of Temperature - Degrees Celsius or Fahrenheit.
12. Timer Status – Displays the current state of the timed output.
13. Clock - Digital clock display in 24h format.
LCD Display
1 2 345
6 7 8 9 10 11
13
12

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Slimline Series Model: PRTHW / PRTHW-N
Setting the Clock
To set the clock, follow these steps.
• With the thermostat turned ON, press the Clock key three times ......................
• Use the Up/Down keys to set the hours ..............................................................
• Press H to conrm settings ................................................................................................
• Use the Up/Down keys to set the minutes .........................................................
• Press H to conrm settings ...............................................................................................
• Use the Up/Down keys to set the day of the week ..........................................
• Press A to conrm settings and return to main display ..........................................
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.
Day
Hours
Minutes

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Slimline Series Model: PRTHW / PRTHW-N
Comfort Levels Explained
The thermostat provides Weekday/Weekend or 7 Day Programming options.
You should consult the“Optional Features” section to select the required mode.
The thermostat is supplied with comfort levels already programmed, but these can be
changed easily. The default times and temperatures 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 --.--
Note: For Weekday/Weekend programming, the 4 comfort levels are the same for all
weekdays but can be dierent for the weekends.
For 7 Day programming, each day can have 4 dierent comfort levels.
• To program comfort levels, press the Clock key twice .................................................
• Use the Up/Down keys to enter the required WAKE time .......................
• Press H to conrm settings ..........................................................................................
• Use the Up/Down keys to enter the required WAKE temperature .......
• Press H to conrm settings ..........................................................................................
• You will now see“LEAVE”displayed on screen.
• Repeat the programming steps for each period until complete.
• For unused periods enter --.-- and the thermostat will ignore the setting.
• Press A to conrm settings and return to main display ....................................
Note:
• In 7 Day programming mode you can repeat for each day independently.
• In Weekday/Weekend programming mode you will see Sat Sun displayed on
screen and can repeat for the weekend.
• To change the programming mode please refer to pages 21-24.
For 7 Day programming,
only Mon is displayed
in the day indicator eld.
For Weekday/Weekend programming,
Mon Tue Wed Thu Fri
are displayed on screen.

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Slimline Series Model: PRTHW / PRTHW-N
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.
Note: The keypad lock indicator is only displayed when the lock is active.
Keypad Lock Indicator
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
Note: This override will be maintained until the next programmed comfort level.

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Slimline Series Model: PRTHW / PRTHW-N
Temperature Hold
The temperature hold function allows you to manually override the current operating
program and set a dierent temperature for a desired period.
• Press H to commence temperature hold ....................................................................
• Use the Up/Down keys to enter the required Hold time..............................
• Press H to conrm settings ..............................................................................................
• Use the Up/Down keys to enter the required Hold temperature..............
• Press A to conrm settings and return to main display ........................................
You will see the Hold For indication is displayed on screen.
The time will countdown the set duration and then revert to the normal program.
To cancel temperature hold, follow the same steps but reduce the Hold time to 00:00 hours.
Hold ON Indicator
Hold Time Remaining
Holiday
Holiday Days
Holiday ON Indicator
Note: A holiday period does not start until 00:00 the next day. For example, if you set
a holiday period on Friday for 2 days, Saturday will be counted as the rst day and the
thermostat will revert back to the programmed schedule at 00:00 on Monday.
The holiday function reduces the set temperature in your home to the frost
protection temperature setting (see page 21).
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 H three times (until you see the suitcase on screen) .................................
• Use the Up/Down keys to enter the number of days holiday ...................
• Press A to conrm settings and return to main display .......................................
The display will show a suitcase indicating the thermostat is in holiday mode.
To cancel, follow the same steps but reduce the Holiday duration to 00 days.

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Slimline Series Model: PRTHW / PRTHW-N
Thermostat completely OFF Thermostat powered ON
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 21).
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 Heating & Hot Water ON/OFF
The heating is indicated ON when the ame icon is displayed, the hot water is
indicated ON when TIMER ON 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, heating and hot water output will be turned OFF completely.*
To turn the thermostat back ON, press the Power button once again ...................
*See Feature 3 on page 21

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Slimline Series Model: PRTHW / PRTHW-N
Setting the Hot Water Switching Times Hot Water Override
• Press the Clock key once ...............................................................................................
• If your thermostat is setup for Weekday/Weekend programming, Mon-Fri will be
displayed on screen. For 7 day programming Mon will be displayed on screen.
• Using the Up/Down keys, enter the required start time
for Hot Water Time 1 ...............................................................................................
• Press H to conrm settings ...........................................................................................
• Use the Up/Down keys, enter the required end time
for Hot Water Time 1 ...............................................................................................
• Press H to conrm settings ...........................................................................................
Repeat the programming steps for each switching time, entering --.-- for any
unused periods.
You can override the hot water override by pressing the key.
If the hot water is OFF, pressing the key will switch the hot water ON and
similarly pressing the key when the hot water is ON will switch it OFF.
Timer ON or OFF will ash to show when the hot water has been overridden.
This override will last until the next programmed setting.
Time
Timer Status
Timer Status

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Slimline Series Model: PRTHW / PRTHW-N
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.
Optional Features Explained
Feature 07 – Temperature Up/Down Limit: This function allows you to limit the
use of the Up and Down 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.
Feature 09 – Floor Temp Limit: This function is not available on this model.
Feature 10 – Optimum Start: Optimum start will delay the start up of the
heating system to the latest possible moment to avoid unnecessary heating
and ensure the building is warm at the programmed time. The thermostat uses
the rate of change information to calculate how long the heating needs to raise
the building temperature 1°C (with a rate of change of 20, the thermostat has
calculated the heating needs 20 minutes to raise the building temperature 1°C)
and starts the heating accordingly.
Feature 11 – Rate of Change: For information only.
Feature 12 - Programming Mode: The thermostat oers 2 programming
methods. Weekday/Weekend allows you to program 4 comfort levels for the
weekdays and 4 dierent 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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Slimline Series Model: PRTHW / PRTHW-N
Optional Settings - Feature Table
01
02
03
04
05
06
07
08
09
10
11
12
FEATURE
Temperature Format
Switching Dierential
Frost Mode
Frost Protection Temperature
Output Delay
Communications ID No.
Up/Down Temperature Limit
Sensor Selection
Floor Temperature Limit
Optimum Start
Rate of Change
Program Mode
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 comms address 01-32
00o- 10oC (00 = Default)
Built in Sensor
Not used in this model
00 - 03 Hours (00 = Default)
Minutes to raise by 1oC
00 = Weekday/Weekend
01 = 7 Day Programming
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 key until the display appears as shown below ..........
• Use the Clock key 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 again to turn the thermostat back ON .................
Setting Value
Feature Number

2625
Slimline Series Model: PRTHW / PRTHW-N
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 ..........................
Calibration Temperature Setting
Set Icon
All icons displayed simultaneously. Factory reset is complete.
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.

2827
Slimline Series Model: PRTHW / PRTHW-N
Wiring Diagram - PRTHW-N to UH1
PRTHW
B2 B1 A2 A1 N L
230VAC
CH
HW
Mains Supply In
85V-230V AC
Live
Neutral
L
Cylinder
Thermostat
Hot Water Valve
To Boiler NL
Heating Valve
To connect boiler, consult
boiler makers wiring diagram
To Boiler N
Wiring Diagram - PRTHW
PRTHW-N
B2 B1 A2 A1 - + Y B
Network 12VDC
CH
HW
Connecting PRTHW-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.
UH1
ZONE 1 ZONE 2
A2
A1
B2
B1
B
_
+
A2
A1
B
Y
_
+
Y

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Slimline Series Model: PRTHW / PRTHW-N
Notes
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Wiring Diagram
PRTHW-N to PRC Voltfree Switching
12V
COMMS
CABLE
Voltfree Switching With the Heatmiser PRC
A2 B2
NONCCNONCCNEL
230V
SUPPLY IN A2 Volt Free Output
B2 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
PRTHW-N
B2 B1 A2 A1 - + Y B
Network 12VDC
CH
HW

31
Slimline Series
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