CDT2 Room Thermostat Mains Operated Non

CDT2 Room Thermostat

Specifications:

• Contacts: Volt Free
• Power supply / Input: 230VAC
• Power consumption: 1.1W
• Temperature range: Ambient temperature
• Ambient admissible humidity: 5-95%RH
• Contact rating: 7(3)A 230VAC
• Switch output: SPDT Volt Free
• Dimensions: 91 x 91 x 26mm
• Internal temperature sensor: NTC 100K
• Backlight: White
• IP rating: IP20
• Pollution degree: 2
• Automatic action: 1C

Installation Instructions:

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.

1. Remove the thermostat from its packaging.
2. Choose a mounting location ensuring accurate room temperature
   measurement.

• Mount the thermostat 1.5 meters above the floor level.

• Avoid direct exposure to sunlight or other heating/cooling
  sources.

• Use a Philips screwdriver to open the front housing by
  loosening the screw on the bottom of the thermostat.

Operating Instructions:

• On/Off Function: To turn the thermostat on or
  off.

• Adjusting the Target Temperature: Set the
  desired temperature for the room.

• Locking the Keypad: Lock the keypad to prevent
  unintended changes.

• Backlight: Control the backlight
  settings.

• Menu: Access different settings and
  modes.

Frequently Asked Questions (FAQ):

Q: Can I calibrate the thermostat?

A: Yes, you can calibrate the thermostat by following the
instructions in the manual under the “Calibrate” section.

Q: What is the power supply requirement for this

thermostat?

A: The thermostat requires a power supply of 230VAC.

Q: How do I reset the thermostat to factory default

settings?

A: You can reset the thermostat to factory default settings by
following the instructions in the “Resetting the Thermostat”
section of the manual.

CDT2
Room Thermostat Installation and Operation Guide

Table of contents

Installation Instructions

Factory Default Settings

2

Specifications

3

LCD Display

4

Buttons

5

Wiring

6

Mounting & installation

7

Operating Instructions

On / Off Function

11

Adjusting the Target Temperature

11

Locking the Keypad

12

Backlight

12

Menu

HYS Hysteresis HOn and HOFF

13

Calibrate

14

Setting High and Low limits

15

Operating Mode

16

Normal Mode (Nor)

17

Delay Start Control (On/Off )

18

Time Proportional Integral Mode (TPI)

20

Resetting the Thermostat

23

Mains operated non-programmable Room Thermostat Installation Instructions

Factory Default Settings

High and Low Temp. limitation: Keypad lock: Operating mode: Temperature indicator: Frost protection: HYS On: HYS OFF:

Off Off Normal °C On (5°C) 0.4°C 0.0°C

Note: Frost protection is built into this thermostat. It will only be activated when the thermostat is in OFF position and the temperature reaches 5°C.

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Specifications

Contacts:

Volt Free

Power supply / Input:

230VAC

Power consumption:

1.1W

Temperature range:

5 … 35°C

Ambient temperature:

0 … 45°C

Ambient admissible humidity: 5-95%RH

Contact rating:

7(3)A 230VAC

Switch output:

SPDT Volt Free

Dimensions:

91 x 91 x 26mm

Internal temperature sensor: NTC 100K

Backlight:

White

IP rating:

IP20

Pollution degree:

2

Hysteresis (Switching differential): Adjustable from 0 to 1°C

0.1°C increments

Automatic action:

1C

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3

LCD Display

[1] Displays when setting target temperature. [2] Displays room temperature title. [3] Displays current / target temperature. [4] Displays when changing mode setting. [5] Displays when setting in TPI mode. [6] Displays when the thermostat is calling for heat. [7] Displays when keypad is locked. [8] Displays when thermostat is in the OFF mode. [9] Displays when setting HIGH and LOW temperature limit. [10] Displays during calibration mode. [11] Displays when setting hysteresis. [2] [3] [4] [5] [1] set room temp mode cyc p band [6]

HYS calibrate high low limit off

[7] [11] [10] [9] [8]

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Buttons

Reset Button

OK Button

Standby Button

Down Button Up Button

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5

Wiring

321
ON COM OFF L N

Terminal Connections

N

Neutral In

L

Live In

Terminal 1

OFF – N/C Normally closed connection

Terminal 2

COM – Common connection

Terminal 3

ON – N/O Normally open connection

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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 in the following ways:

1. Directly mounted on wall 2) To a recessed conduit box 3) To a surface mounting box

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7

Mounting & Installation Continued

1. Remove the thermostat from its packaging.
2. 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.
3. Use a philips screwdriver to loosen the screw on the bottom of the thermostat to open the front housing.
4. Wire the thermostat according to the wiring diagram on page 6.
5. Screw the backplate onto a back box or directly to the surface.
6. Close the front housing and tighten the screw on the bottom of the thermostat.

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90

26

90

45 113

9

Mains operated non-programmable Room Thermostat Operating Instructions

On / Off Function
Press to turn the thermostat On or Off. When in the ON mode the thermostat will display the current room temperature. When in the OFF mode the thermostat will display the current room temperature and the word `OFF’.

Adjusting the Target Temperature

Press Press Press Press

to increase the target temperature from 5-35°C. or wait 5 seconds. The target temperature is now saved. to decrease the target temperature from 5-35°C. or wait 5 seconds. The target temperature is now saved.

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11

Locking the Keypad
To lock the thermostat, press and hold and for 10 seconds. will appear on the screen. The buttons are now disabled.
To unlock the thermostat, press and hold and for 10 seconds. will disappear from the screen. The buttons are now enabled.

Backlight

AUTO

There are three settings for selection.

AUt’OFF’

The backlight is on for 5 seconds when any button is pressed. The backlight is permanently off.

`ON’ The backlight is permanently on.

To adjust the backlight setting, press and hold `AUt’ appears on the screen.

for 10 seconds.

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

Press to confirm selection and to return to normal operation.

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Menu
This menu allows the user to adjust additional functions. To access the menu, press & hold and together for 5 seconds.

HYS ­ Hysteresis HOn and HOFF HOn 0.4°C HOff 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. IfHYS 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 and together for 5 seconds. HYS’ will appear on the screen. Press to select.HOn’ will appear on the screen. Press and temperature will begin to flash. Use and to select the HOn’ temperature, press .HOFF’ appears on the screen. Press and the temperature will begin to flash. Use and to select the `HOFF’ temperature, press
. Press to return to normal operation.

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13

Calibrate
This menu allows the installer to calibrate the temperature of the thermostat. To access this setting press and hold and together for 5 seconds. HYS’ will appear on the screen. Press untilCALIBRATE’ flashes on the screen. Press to select. The actual temperature will flash on the screen. Press and to calibrate the temperature. Press to confirm the temperature. Press to return to normal operation.

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Setting High and 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 and seconds.

together for 5

HYS’ will appear on the screen. Press untilLIMIT’ flashes on

the screen. Press to select.

`HIGH LIMIT’ will appear on the screen, the temperature will begin to flash.

Use and to select the high limit for the thermostat.

Press to confirm.

`LOW LIMIT’ will appear on the screen, the temperature will begin to flash.

Use and to select the low limit for the thermostat.

Press to confirm.

Press to return to normal operation.

`LIMIT’ will appear on the screen.

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15

Operating Mode (Normal / Delay Start / TPI)
There are three settings for selection, Normal, Delay Start or TPI mode. The default setting is Normal. Press and hold and together for 5 seconds. HYS’ will appear on the screen. Press untilMODE’ appears on the screen. Press to select. Use and to select between: nOr (Normal mode) dS (delay start mode) tPi (Time proportional integral mode) Press to confirm the mode.

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Nor (Normal Mode)
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.

Temp 22°C 21°C 20°C 19°C 18°C 17°C

Graph (17.1): On / Off Control

Target Temperature

0

20

40

60

80 100 Time Minutes

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Operating Mode (Normal / Delay Start / TPI) continued

Delay Start Control (On/Off)
When in this mode the thermostat is delayed by a variable time depending on the current temperature, target temperature and also the fall in temperature from when the delay start has activated. The will flash until the thermostat activates. When activated the thermostat will allow the heating system time to reach the target and delay start will remain inactive until it reaches this target.

Time delay after Delay Start activated in minutes

48 42 36 30 24 18 12
6 0
0

Graph (18.1): Delay Start Control

1

2

3

4

5

6

Temperature below thermostat setting °C

E.g: If the temperature is 6°C below the thermostat target, the thermostat will call for heat immediately.
If the temperature is 2°C below the target, the thermostat will not call for heat for 32 minutes.

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Delay start can be reactivated by:
1. Press to lower the target below the current temperature.
2. Press to confirm.
3. Press to increase the target temperature above the zone temperature within 6°C .
4. Press to confirm. The heating will be delayed as per the graph on page 18. If the difference between the actual temperature and the target is 1°C the thermostat will delay starting for circa 40 minutes. If the difference between the actual temperature and the target is 3°C the thermostat will delay starting for circa 24 minutes. If the difference is 6°C or more then the thermostat will be switched on immediately. The time delay will change if the temperature drops from the original calculation.

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19

Operating Mode (Normal / Delay Start / TPI) continued

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 Bandwith section, TPI will start to affect the thermostats 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 thermostats operation
1. The number of heating cycles per hour
2. The Proportional Bandwith

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.

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Pb -Proportional Bandwith 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.

Temp 22°C 21°C 20°C 19°C 18°C 17°C

Graph (21.1): TPI Control

Target Temperature Proportional Bandwidth

0

20

40

60

80

100 Time Minutes

Heating On

Heating Off

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21

Operating Mode(Normal / Delay Start / TPI) continued
Time Proportional Integral Mode (TPI) Continued Once TPI mode is selected, CYC’ and06′ will appear on the screen. Use and to select from 2,3,6 or 12. Press to confirm.
P Band’ and2.0′ will appear on the screen. Use and to select from 1.5 to 3.0. Press to confirm. Press to return to normal operation.

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Resetting the Thermostat
To reset the thermostat to factory settings, locate the reset button on the left hand side of the thermostat. Press the reset button and release it. NO’ will flash on the screen. Press .YES’ will flash on the screen. Press to confirm. The thermostat will restart and revert to its factory settings.

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23

Notes

Notes

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

© 2024 EPH Controls Ltd. 2024-04-30_CDT2_DS_PK

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