EPH CONTROLS CDC2 Cylinder Room Thermostat User Guide

CDC2
Cylinder / Room Thermostat
Installation and Operation Guide

CDC2 Cylinder Room Thermostat

Mains operated non-programmable
Cylinder / Room Thermostat
Installation Instructions

Factory Default Settings

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.

Specifications

Heating 5 … 35˚C
Hysteresis (Switching differential):| Hot Water  0 … 20°C (0.5°C increments)
Heating  0 … 1°C (0.1°C increments)

LCD Display

[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.

Buttons

Wiring

Terminal Connections

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

Mounting & Installation (Continued)

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 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. Ensure the temperature sensor is free from obstruction. Close the front housing and tighten the screw on the bottom of the thermostat.

Note:
For side entry of the temperature sensor, please use breakout provided.

Mounting of Temperature Sensor

1. Cylinder
   Surface
   The temperature sensor should be fitted 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.
   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.

2. Pipe
   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.

3. Adjacent Room
   Mount the NTC sensor housing 1.5 meters above floor 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

Quick introduction to your CDC2 Thermostat:

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.

On / Off Function & Adjusting the Target Temperature

On / Off Function
Press to turn the thermostat On or Off.
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’.

Adjusting the Target Temperature
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.

Locking the Keypad & Backlight

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’ – The backlight is on for 5 seconds when any button is pressed.
‘OFF’ – The backlight is permanently off.
‘ON’ – The backlight is permanently on.
To adjust the backlight setting, press and hold for 10 seconds.
‘AUt’ appears on the screen.
Use and to change the mode between AUTO, ON and OFF.
Press to confirm selection and to return to normal operation.

Menu Function

This menu allows the user to adjust additional functions.
To access the menu, press and hold & together for 5 seconds.
Note: When CyL mode is active, PO1 menu is not accessible.

PO 1 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 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 confirm the mode.
PO 1 Operating Mode (Normal / Delay Start / TPI)
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)
Delay Start Control (On/Off)
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 flash 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.
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.
Delay start can be reactivated by:

1. Press to lower the target temperature below the current temperature.
2. Press and to set the temperature.
3. Press to increase the target temperature above the zone temperature within 6°.
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.
PO 1 Operating Mode (Normal / Delay Start / TPI)
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 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 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.
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.

P02 Setting High & Low Limits Hi 90°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 & together for 5 seconds.
‘P01’ will appear on the screen.
Press until ‘P02 & LIMIT’ appears on the screen.
Press to select.
‘HI 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.
When this setting is enabled, ‘LIMIT’ will appear permanently on the screen when the High or Low Limits have been changed.

P03 Hysteresis HOn & HOFFHOn 5°C HOFF 0°C
‘HOF’ will appear on the screen.
Press and the differential temperature will begin to flash.
Use & to select the ‘HOFF’ temperature.
Press to confirm.
Press to return to normal operation.

P04 Calibrate
This menu allows the installer to calibrate the temperature of the thermostat.
To access this setting, press and hold & together for 5 seconds.
‘P01’ will appear on the screen.
Press until ‘P04 & CALIBRATE’ appears on the screen.
Press to select.
‘CALIBRATE’ and the actual temperature will appear on the screen.
Press and to calibrate the temperature.
Press to confirm the temperature.
Press to return to normal operation.

P05 Temperature Range Selection
This menu allows the installer to choose between different temperature ranges for various thermostat application.
To access this setting, press and hold & together for 5 seconds.
‘P01’ will appear on the screen.
Press until ‘P05’ appears on the screen.
Press to select.
‘CyL’ will appear on the screen.
Press to select ‘Htg’ mode.
Press to confirm the mode.
Press to return to normal operation.
Note:
Heating parameters have now been applied to Temperature Range, Hysteresis and High & Low Limit settings.

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.
‘rSt’ will appear and ‘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.

Notes
……………..

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www.ephcontrols.co.uk
T +44 1933 626 396

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| EPH CONTROLS CDC2 Cylinder Room Thermostat [pdf] User Guide
CDC2 Cylinder Room Thermostat, CDC2, Cylinder Room Thermostat, Room Thermostat, Thermostat
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