RDTP Recessed Room Thermostat

Installation and Operation Guide

A white, square digital thermostat (RDTP model) is shown. The LCD screen displays "MON", "ROOM TEMP 21.0°", the date "15.02.08:30", and "AUTO". Below the screen are buttons labeled with icons and text: Menu (☰), Time (◷), +1h (+1h), Down (⌄), Up (⌃), OK (OK). The EPH CONTROLS logo is visible.

Introduction

This guide provides comprehensive instructions for the installation and operation of the EPH Controls RDTP Recessed Room Thermostat.

Installation Instructions

Factory Default Settings ⚙️

High and Low Temp. limitation: Off
Keypad lock: Off
Operating mode: Normal
Temperature indicator: °C
Frost protection: On (5°C)
HYS On: 0.4°C
HYS OFF: 0.0°C

Specifications

Switch output: SPDT Volt Free
Power supply / Input: 230Vac
Power consumption: Operating <1W, Standby 0.1 mW
Temperature range: 5 ... 35°C
Ambient temperature: 0 ... 45°C
Ambient admissible humidity: 5 - 95%RH
Contact rating: 10(3)A 230Vac
Dimensions: 95 x 95 x 40mm
Internal Temperature sensor: NTC 100K
External Temperature sensor: NTC 10K
Program memory backup: 3 months
Battery: LIR2032
Backlight: White
IP rating: IP20
Pollution degree: 2
Hysteresis (Switching differential): Adjustable from 0 to 1°C (0.1°C increments)
Automatic action: 1C

LCD Display ⚙️

The LCD display shows various information:

[1] Displays current day of the week.
[2] Displays when setting target temperature.
[3] Displays current room temperature.
[4] Displays when setting HIGH and LOW temperature limit.
[5] Displays when keypad is locked.
[6] Displays when the thermostat is calling for heat (? symbol).
[7] Displays current time and date.
[8] Displays when setting holiday mode.
[9] Displays when thermostat is in boost mode.
[10] Displays current operating mode.
[11] Displays current / target temperature.
[12] Displays current time program.

Diagram shows thermostat LCD with labels: MON TUE WED THU FRI SAT SUN, SET ROOM TEMP HI LO LIM, numbered segments 1-6, and status indicators AUTO, OFF, MAN, BOOST, HOLIDAY, TO FROM.

Buttons

The thermostat has the following buttons:

Menu button: ☰
Time button: ◷
+1h button: [+1h]
Down button: ⌄
Up button: ⌃
OK button: [OK]

Image shows the thermostat with labels pointing to each button: Menu button (☰), Time Button (◷), +1h Button (+1h), Down Button (⌄), Up Button (⌃), OK Button ([OK]).

Wiring

Wiring terminal block diagram shows terminals labeled: 5 (Temp Sensor), 4 (Temp Sensor), 3 (COM), 2 (ON), 1 (OFF), N (Neutral), L (Live). A fuse symbol is shown above terminal 5.

Terminal Connections

L: Live In
N: Neutral In
Terminal 1: OFF - N/C Normally closed connection
Terminal 2: ON - N/O Normally open connection
Terminal 3: COM - Common connection
Terminal 4 & 5: *External Temperature Sensor / Probe (*Available as an accessory if required)

Notes:

If mains output is required, terminals L and 3 must be electrically linked.
If an external NTC 10K sensor is connected, the thermostat will automatically detect and read the temperature from the probe's location.

Mounting & Installation

Caution!

Installation and connection should only be carried out by a qualified person.
Only qualified electricians or authorised service staff are permitted to open the thermostat.
If the thermostat is used in a way not specified by the manufacturer, its safety may be impaired.
Prior to setting the thermostat, it is necessary to complete all required settings described in this section.
Before commencing installation, the thermostat must be first disconnected from the mains.

This thermostat can be mounted to a recessed conduit box.

Diagrams illustrate installation steps: 1. Shows thermostat dimensions (95x95x40.2mm) and certifications (UK CA, CE, IP20, EN60730, EN60529) with temperature ranges (°C/°F) and humidity. 2. Shows recommended mounting locations (wall, avoiding direct heat/sunlight) and incorrect locations (near vents, direct sun). 3. Illustrates separating the front housing from the rear wiring box using a clip. 4. Shows wiring connections to the rear box. 5. Shows mounting the rear box to a recessed back box. 6. Shows attaching the front housing to the rear box.

Installation Steps:

Remove the thermostat from its packaging.
Choose a mounting location so that the thermostat can measure the room temperature as accurately as possible.
- Mount the thermostat 1.5 metres above the floor level.
- Prevent direct exposure to sunlight or other heating / cooling sources.
Use the fastening clip on the base of the thermostat to release the front housing from the rear wiring box as per diagram on page 12.
Wire the thermostat according to the wiring diagram on page 9.
Screw the rear wiring box to the recessed back box.
Attach the front housing to the rear wiring box until it clips securely into place.

Operating Instructions

Adjusting the Target Temperature

Press ⌃ to increase the target temperature from 5-35°C.
Press [OK] or wait 5 seconds. The target temperature is now saved.
Press ⌄ to decrease the target temperature from 5-35°C.
Press [OK] or wait 5 seconds. The target temperature is now saved.

Locking the Keypad ?

To lock the thermostat, press and hold ⌄ and ⌃ for 10 seconds. A ? symbol will appear on the screen. The buttons are now disabled.
To unlock the thermostat, press and hold ⌄ and ⌃ for 10 seconds. The ? symbol will disappear from the screen. The buttons are now enabled.

Backlight ⚙️

There are three settings for selection:

'AUTO': The backlight is on for 10 seconds when any button is pressed.
'On': The backlight is permanently on.
'OFF': The backlight is permanently off.

To adjust the backlight setting, press and hold [OK] for 10 seconds. 'AUTO' appears on the screen.

Use ⌄ and ⌃ to change the mode between AUTO, ON and OFF.

Press [OK] to confirm selection and to return to normal operation.

Mode Selection ⚙️

There are three modes available for selection:

OFF: The thermostat is permanently off.
MAN (or manual): The thermostat is permanently on.
AUTO: The thermostat will operate according to the times and temperatures that have been pre-programmed.

Press ☰ to change between 'AUTO', 'OFF' & 'MAN'. The current mode will be underlined on the screen.

Press ☰ again to scroll through the three modes.

Press [OK] or wait 5 seconds to confirm.

When in Manual mode, the thermostat displays the current room temperature and the word 'MAN'.

When in OFF mode, the thermostat displays the current room temperature and the word 'OFF'.

When in AUTO mode, the thermostat displays the current room temperature, the number of the current program, and the word 'AUTO'.

Setting the Date, Time and Programming Mode

Press ◷ once, the year will begin flashing.
Press ⌄ and ⌃ to adjust the year. Press [OK].
Repeat this for the month, day, hour, and minute. Press [OK].
Press ⌄ and ⌃ to adjust from 5/2d to 7d or 24h mode. Press [OK].
Press ⌄ and ⌃ to turn DST (Day Light Saving time) On or Off.
Wait 20 sec or press ☰, the thermostat will return to normal operation.

Holiday Mode

Holiday mode will switch the thermostat off but will have frost protection enabled for the duration of the holiday period.

Press and hold ◷ for 5 seconds. 'HOLIDAY FROM' will appear on the screen.
Press ⌄, ⌃, and [OK] to set the time for holiday mode to begin. 'HOLIDAY TO' will appear on the screen.
Press ⌄, ⌃, and [OK] to set the time for holiday mode to end.
The thermostat will switch off for the holiday period.
Press [OK] to cancel the holiday function.

How your Programmable Thermostat works

When the thermostat is in AUTO mode, it will operate according to the times and temperatures that have been programmed. The user can select from 6 different programs per day, each with a time and a temperature.

There is no OFF time; only a higher and a lower target temperature. If the user wants the thermostat to be OFF at a certain time, set the temperature for this time to be low. The thermostat will turn ON if the room temperature is lower than the target temperature for the current period.

Example: If P1 is set to be 21°C at 6am, and if P2 is set to be 10°C at 8am, the thermostat will look for the temperature to be 21°C between 6am and 8am.

Factory Program Setting ⚙️

	5/2 Day
	P1	P2	P3	P4	P5	P6
Mon-Fri	06:30 21°C	08:00 10°C	12:00 10°C	14:00 10°C	17:30 21°C	22:00 10°C
Sat-Sun	08:00 21°C	10:00 10°C	12:00 10°C	14:00 10°C	17:30 21°C	23:00 10°C

	7 Day
	P1	P2	P3	P4	P5	P6
Mon-Fri	06:30 21°C	08:00 10°C	12:00 10°C	14:00 10°C	17:30 21°C	22:00 10°C
Sat-Sun	08:00 21°C	10:00 10°C	12:00 10°C	14:00 10°C	17:30 21°C	23:00 10°C

	24 Hour
	P1	P2	P3	P4	P5	P6
Everyday	06:30 21°C	08:00 10°C	12:00 10°C	14:00 10°C	17:30 21°C	22:00 10°C

Programming Modes

The RDTP Room Thermostat has the following programming modes available:

5/2 Day mode: Programing Monday to Friday as one block and Saturday and Sunday as a 2nd block. Each block can have 6 different times and target temperatures.
7 Day mode: Programming all 7 days individually with different times and target temperatures.
24 Hour mode: Programming all 7 days as one block with the same times and target temperatures.

If 7 D mode is selected, you can program each day of the week with 6 individual times and temperatures.

If 24H mode is selected, you can only program each day of the week with the same 6 times and temperatures.

Adjust the Program Setting in 5/2 Day Mode

Press ◷ twice. Programming for Monday to Friday is now selected.
Press ⌄ and ⌃ to adjust the P1 time. Press [OK].
Press ⌄ and ⌃ to adjust the P1 temperature. Press [OK].
Repeat this process to adjust P2 to P6 times & temperatures. Press [OK].
Programming for Saturday to Sunday is now selected.
Press ⌄ and ⌃ to adjust the P1 time. Press [OK].
Press ⌄ and ⌃ to adjust the P1 temperature. Press [OK].
Repeat this process to adjust P2 to P6 times & temperatures. Press [OK].
Press ☰ to return to automatic mode.
While in programming mode, pressing ◷ will jump to the next day (block of days).

Temporary Override

When in AUTO mode, press ⌄ or ⌃ to adjust the target temperature. Press [OK] or wait 5 seconds, the thermostat will operate to this new target temperature until the next switching time.

Permanent Override

Press ☰ to select 'MAN' or manual mode (Permanent Override).
Press [OK].
Press ⌄ or ⌃ to adjust the target temperature.
Press [OK] or wait 5 seconds, the thermostat will operate to this target temperature.
To cancel permanent override, press ☰ until the 'AUTO' or 'OFF' mode are selected.

Boost Function

The thermostat can be boosted to a specific temperature for 1, 2 or 3 hours while the thermostat is operating in all modes except for holiday mode.

Press [+1h] 1, 2 or 3 times, the end time of the boost program will appear flashing on the screen.
If you press [OK], the temperature will now flash. You can adjust the target temperature by pressing the ⌄ or ⌃.
Press [OK] or wait for 5 seconds for the boost to activate.
'BOOST TO' will now be displayed on the screen with the end time for the boost program.
Press [+1h] again to deactivate the boost, the thermostat will revert to its previous operating mode.

Menu Function ⚙️

This menu allows the user to adjust additional functions.

To access the menu, press and hold ☰ & [OK] together for 5 seconds.

P01 Operating Mode (Normal ⚙️ / Optimum Start / TPI)

There are three settings for selection: Normal, Optimum Start, or TPI mode. The default setting is Normal.

Press and hold ☰ & [OK] together for 5 seconds. 'P01' will appear on the screen.
Press [OK] to select.
Use ⌄ and ⌃ to select between:
- nOr (Normal mode)
- OS (Optimum start mode)
- tPi (Time proportional integral mode)
Press [OK] to confirm the mode.

Normal Mode (Nor)

When the temperature falls below the target temperature, ? will appear and the thermostat will activate the demand for heat. When the temperature rises above the target temperature, ? will disappear, and the thermostat will cancel the demand for heat.

Graph (23.1): Normal Mode (On / Off Control). The Y-axis represents Temperature (°C) from 17°C to 22°C. The X-axis represents Time (Minutes) from 0 to 100. A line shows the room temperature fluctuating around the Target Temperature (21°C), with heating turning on when it drops below and off when it rises above.

Optimum Start Control (OS)

When the thermostat is in Optimum Start mode, it will try to reach the target temperature by the start of the next switching time. This is done by setting the Ti (time interval) on the thermostat in this menu to 10, 15, 20, 25, or 30 minutes. This will allow the thermostat 10 to 30 minutes to increase the room temperature by 1°C.

To achieve the target temperature when the program starts, the thermostat will read:

The Room Temperature (RT)
The Setpoint Temperature (ST)
The Target Temperature Difference (TTD) is the difference between the setpoint temperature and the room temperature.

The time (in minutes) that it will take to overcome (TTD) is called Optimum Start Time (OST) and its maximum value is 3 hours = 180 mins. This is subtracted from the start time. As the temperature increases, the thermostat will recalculate the OST.

Three graphs illustrate Optimum Start Control: 1. 'Optimum Start Control Graph with Ti = 20': Y-axis (Optimum Start Time in Mins) from 0 to 180. X-axis (Target Temperature Difference °C TTD) from 9 to 1. A diagonal line shows a linear relationship. 2. 'Optimum Start Control Graph with Ti = 15': Y-axis (Optimum Start Time in Mins) from 0 to 135. X-axis (Target Temperature Difference °C TTD) from 9 to 1. A diagonal line shows a linear relationship. 3. 'Optimum Start Control Graph with Ti = 10': Y-axis (Optimum Start Time in Mins) from 0 to 90. X-axis (Target Temperature Difference °C TTD) from 9 to 1. A diagonal line shows a linear relationship. Examples are provided for Ti=20 and Ti=10, showing how the thermostat calculates the start time to reach the target temperature.

Time Proportional Integral Mode (TPI)

When the thermostat is in TPI mode and the temperature is rising in the zone and falls into the Proportional Bandwidth section, TPI will start to affect the thermostat's operation. The thermostat will turn on and off as it gains heat so that it doesn't overshoot the target by too much. It will also turn on if the temperature is falling so it doesn't undershoot the target, which will leave the user with a more comfortable level of heat.

There are 2 settings that will affect the thermostat's operation:

The number of heating cycles per hour
The Proportional Bandwidth

CyC – Number of Heating Cycles per hour: 6 Cycles ⚙️

This value will decide how often the thermostat will cycle the heating on and off when trying to achieve the target temperature. You can select 2/3/6 or 12.

Graph (27.1): TPI Control. The Y-axis represents Temperature (°C) from 17°C to 22°C. The X-axis represents Time (Minutes) from 0 to 100. A line shows the room temperature fluctuating within a 'Proportional Bandwidth' zone around the 'Target Temperature', with 'Heating On' and 'Heating Off' periods indicated.

Pb -Proportional Bandwidth: 2°C ⚙️

This value refers to the temperature below the target at which the thermostat will start to operate in TPI control. You can set this temperature from 1.5°C to 3.0°C in 0.1°C increments.

Once TPI mode is selected, 'CYC' and '06' will appear on the screen.

Use ⌄ and ⌃ to select from 2, 3, 6 or 12. Press [OK] to confirm.

'P Band' and '2.0' will appear on the screen.

Use ⌄ and ⌃ to select from 1.5 to 3.0. Press [OK] to confirm.

Press ☰ to return to normal operation.

P02 Setting High & Low Limits (Hi 35°C Lo 5°C) ⚙️

This menu allows the installer to change the minimum and maximum temperatures that the thermostat can be set at.

To access this setting, press and hold ☰ & [OK] together for 5 seconds. 'P01' will appear on the screen.
Press ⌃ until 'P02' appears on the screen.
Press [OK] to select.
Use ⌄ and ⌃ to select 'ON'.
Press [OK] to select. 'HI LIM' will appear on the screen, the temperature will begin to flash.
Use ⌄ and ⌃ to select the high limit for the thermostat.
Press [OK] to confirm. 'LO LIM' will appear on the screen, the temperature will begin to flash.
Use ⌄ and ⌃ to select the low limit for the thermostat.
Press [OK] to confirm. The settings will be saved.
Press ☰ to return to the previous screen. When this setting is enabled, 'LIM' will appear permanently on the screen.

P03 Hysteresis HOn & HOff (HOn 0.4°C HOFF 0.0°C) ⚙️

This menu allows the installer to change the switching differential of the thermostat when the temperature is rising and falling.

If 'HYS ON' is set at 0.4°C and the setpoint is 20°C, then the thermostat will switch on when the temperature drops below 19.6°C.

If 'HYS OFF' is set at 0.2°C and the setpoint is 20°C, then the thermostat will switch off when the temperature reaches 20.2°C.

To access this setting, press and hold ☰ & [OK] together for 5 seconds. 'P01' will appear on the screen.
Press ⌃ until 'P03' appears on the screen. Press [OK].
'HOn' will appear on the screen and the differential temperature will begin to flash.
Use ⌄ & ⌃ to select the 'HOn' temperature, press [OK] to confirm.
'HOFF' will appear on the screen and the differential temperature will begin to flash.
Use ⌄ & ⌃ to select the 'HOFF' temperature, press [OK] to confirm.
The settings will be saved.
Press ☰ to return to the previous screen.

P04 Calibrate ⚙️

This menu allows the installer to calibrate the temperature of the thermostat.

To access this setting, press and hold ☰ & [OK] together for 5 seconds. 'P01' will appear on the screen.
Press ⌃ until 'P04' appears on the screen.
Press [OK] to select.
'CAL' and the actual temperature will appear on the screen.
Press ⌄ and ⌃ to calibrate the temperature.
Press [OK] to confirm the temperature.
The current temperature will be saved and the user will be returned to the previous screen.

P05 Frost Protection (On 5°C) ⚙️

This menu allows the installer to enable or disable frost protection on the thermostat.

When 'ON', the thermostat will automatically call for heat when the temperature drops to 5°C.

To access this setting, press and hold ☰ & [OK] together for 5 seconds. 'P01' will appear on the screen.
Press ⌃ until 'P05' appears on the screen.
Press [OK] to select.
'Fr' will appear on the screen and 'ON' will begin to flash.
Use ⌄ and ⌃ to turn frost protection 'ON' or 'OFF'.
Press [OK] to confirm.
The setting will be saved and the user will be returned to the previous screen.

P06 Resetting the Thermostat

To reset the thermostat to factory settings:

Press and hold ☰ and [OK] together for 5 seconds. 'P01' will appear on the screen.
Press ⌃ until 'P06' appears on the screen.
Press [OK] to select.
'FACt' will appear on the screen and 'nO' will begin to flash.
Press ⌃. 'YES' will flash on the screen.
Press [OK] to confirm.
The thermostat will restart and revert to its factory defined settings.

Contact Information

EPH Controls IE
technical@ephcontrols.com
www.ephcontrols.com/contact-us
+353 21 471 8440
Cork, T12 W665

EPH Controls UK
technical@ephcontrols.co.uk
www.ephcontrols.co.uk/contact-us
+44 1933 322 072
Harrow, HA1 1BD

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