EPH Controls CDC2 Operating instructions

Installation and Operation Guide
Cylinder / Room Thermostat
CDC2

2
Factory Default Settings
3
Specications
4
LCD Display
5
Buttons
6
Wiring
7
10
Mounting & Installation
Mounting of Temperature Sensor
15
Locking the Keypad / Backlight
16
Menu Function
22
14
On / O Function & Adjusting the Target Temperature
18
25
Table of contents
20
26
27
23
17
Installation Instructions
Operating Instructions
Delay Start Control (On/O))
P03 HYS Hysteresis HOn and HOFF
Normal Mode (Nor)
Time Proportional Integral Mode (TPI)
P02 Setting High and Low Limits
P01 Operating Mode
P04 Calibrate
P05 Temperature Range Selection
Resetting the Thermostat
13
Quick introduction to your CDC2 Thermostat

Mains operated non-programmable
Cylinder / Room Thermostat
Installation Instructions

2CDC2
Factory Default Settings
High and Low Temp. limitation: O
Keypad lock: O
Operating mode: Normal
Temperature indicator: ˚C
Frost protection: On (5˚C)
HYS On: 5˚C
HYS OFF: 0˚C
Temperature selection range: CyL (Hot Water Parameters)
Temperature sensor: Connected
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.

3
EPH Controls Ltd.
Specications
Contacts: Volt Free
Power supply / Input: 230VAC
Power consumption: 1.5W
Ambient temperature: 0 … 45˚C
Ambient admissible humidity: 5-95%RH
Contact rating: 10(3)A 230VAC
Dimensions: 91 x 91 x 26mm
External Temperature sensor: NTC 10K
Backlight: White
IP rating: IP20
Pollution degree: 2
Automatic action: 1C
Temperature range: Hot Water 5 … 90˚C
Heating 5 … 35˚C
Hysteresis (Switching dierential):
Hot Water 0 … 20°C (0.5°C increments)
Heating 0 … 1°C (0.1°C increments)

4CDC2
[3]
[1]
[11] [10] [9]
[12]
[5]
[4] [6][2]
[7]
[8]
mode cyc p bandset room temp
HYS
calibrate high low limit off
[1] Displays when setting target temperature.
[2&3] Displays when heating mode is active.
[3] Displays when cylinder mode is active.
[4] Displays current / target temperature.
[5] Displays when changing mode settings.
[6] Displays when changing TPI mode settings.
[7] Displays when the thermostat is calling for heat.
[8] Displays when keypad is locked.
[9] Displays when thermostat is in the OFF mode.
[10] Displays when setting HIGH and LOW temperature limit.
[11] Displays during calibration mode.
[12] Displays when setting hysteresis.
LCD Display

5
EPH Controls Ltd.
Buttons
OK Button
Down Button Up Button
Reset Button
Standby Button

6CDC2
Wiring
OFF L N
ON
321
COM
Terminal Connections
N Neutral
L Live
1 OFF - N/C Normally closed connection
2 COM- Common connection
3 ON - N/O Normally open connection

7
EPH Controls Ltd.
Mounting & Installation
Caution!
Installation and connection should only be carried out by a qualied person.
Only qualied electricians or authorised service sta are permitted to open the
thermostat.
If the thermostat is used in a way not specied 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 rst 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

8CDC2
1) Remove the thermostat from its packaging.
2) Choose a mounting location so that the thermostat can
measure the temperature as accurately as possible.
- Mount the thermostat 1.5 metres above the oor 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) Ensure the temperature sensor is free from obstruction. Close
the front housing and tighten the screw on the bottom of
the thermostat.
Mounting & Installation Continued
Note:
For side entry of the temperature sensor, please use breakout provided.

9
EPH Controls Ltd.
90
90
26
45 113

10 CDC2
1. Cylinder
2. Pipe
Surface
The temperature sensor should be tted on the bottom 1/3 of the
cylinder.
Remove a section of insulation on the cylinder to reveal the copper
surface.
Attach the temperature sensor to the surface of the cylinder using the foil
tape provided.
Remove any insulation on the pipework to reveal the pipe.
Attach the temperature sensor to the surface of the pipe using the foil
tape provided.
Cylinder Pocket
Insert the temperature sensor into the appropriate pocket on the
cylinder. Secure the temperature sensor to the pocket using the foil
tape provided.
Mounting of Temperature Sensor

11
EPH Controls Ltd.
3. Adjacent Room
Mount the NTC sensor housing 1.5 meters above oor level.
Ensure the temperature sensor is secured tightly in the NTC sensor
housing.
Note:
NTC sensor housing can be purchased as an accessory from EPH Controls.
Product code: NTC-Housing

Mains operated non-programmable
Cylinder / Room Thermostat
Operating Instructions

13
EPH Controls Ltd.
The CDC2 thermostat is a Mains operated, non-programmable
thermostat which can control either Hot Water or Heating applications.
The easily accessible menu will allow you change from Hot Water to
Heating temperature ranges at the push of a button.
The external temperature sensor gives the installer the option to read
the temperature of a Hot Water cylinder or of an adjacent room.
The temperature sensor comes connected with hot water temperature
ranges set as default.
Quick introduction to your CDC2 Thermostat:

14 CDC2
Press to turn the thermostat On or O.
When in the ON mode the thermostat will display the current
temperature.
When in the OFF mode the thermostat will display the current
temperature and the word ‘OFF’.
Press to increase the target temperature.
Press or wait 5 seconds. The target temperature is now saved.
Press to decrease the target temperature.
Press or wait 5 seconds. The target temperature is now saved.
On / O Function
Adjusting the Target Temperature

15
EPH Controls Ltd.
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.
There are three settings for selection.
‘AUt’ The backlight is on for 5 seconds when any button is pressed.
‘OFF’ The backlight is permanently o.
‘ON’ The backlight is permanently on.
Use and to change the mode between AUTO, ON and OFF.
Press to conrm selection and to return to normal operation.
Backlight AUTO
To adjust the backlight setting, press and hold for 10 seconds.
‘AUt’ appears on the screen.

16 CDC2
Menu Function
This menu allows the user to adjust additional functions.
To access the menu, press and hold & together for 5 seconds.
There are three settings for selection, Normal, Delay Start or TPI mode.
The default setting is Normal.
Press and hold the and together for 5 seconds,
‘P01’ will appear 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 conrm the mode.
PO 1 Operating Mode (Normal / Delay Start / TPI)
Note: When CyL mode is active, PO1 menu is not accessible.

17
EPH Controls Ltd.
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.
PO 1 Operating Mode (Normal / Delay Start / TPI)
22˚C
21˚C
20˚C
19˚C
18˚C
17˚C
Temp
Time Minutes
Graph (17.1): On / O Control
Target Temperature
200 40 60 80 100

18 CDC2
PO 1 Operating Mode (Normal / Delay Start / TPI)
Delay Start Control (On/O)
When the delay start mode is active, ‘dS’will appear continuously on
the screen. 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 ash until the thermostat activates.
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.
48
42
36
30
24
18
12
6
0
0123456
Temperature below thermostat setting °C
Time delay after Delay Start activated in minutes
Graph (18.1): Delay Start Control