background image

P0 1:   Mode (Normal / Optimum Start / TPi)
P0 2:  Hi Lo (Limiting the thermostat)
P0 3:  Hysteresis (Differential)
P0 4:  Calibration
P0 5:   Frost Protection
 Exit
P0 1:   Mode (Normal / Optimum Start / TPi)

P0 2:   Hi Lo (Limiting the thermostat)

P0 3:   Hysteresis HOn and HOFF

P0 4:  Calibration

Normal Mode (Nor)

14. Installer menu (without OpenTherm® connected)

To access the installer menu, you must hold Prog and OK for 5 seconds. 
When in the installer menu, press         ,          and 

OK

 to navigate and select. 

Use AUTO, MAN or OFF to go back a step. 

When the thermostat is in Normal mode, the thermostat will try to reach the 
target temperature after the program changes.  

Example:  Program 1 on the thermostat is 21°C for 06:30am and the room 

temperature is 18°C. The thermostat will start the heating at 06:30am and the 

room temperature will start to increase then. 

When the thermostat is in Optimum Start mode, the thermostat will try to 
reach the target temperature by the start time of the next switching time. 
This is done by setting the Ti (time interval) on the thermostat in this menu 
to 10, 15 or 20. This will allow the thermostat 10 mins, 15 mins or 20 mins to 
increase the room temperature by 1°C. 
Ti can be set when OS is selected in the installer menu. 
To achieve the target temperature when the program starts, the thermostat 
will read:
 

1.  The Room Temperature (RT) 

 

2.  The Setpoint Temperature (ST)

 

3.  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 if the 
temperature is increasing too quickly. 

EPH Controls Ireland

[email protected]    www.ephcontrols.com

EPH Controls UK

[email protected]    www.ephcontrols.co.uk

Optimum Start Mode (OS)

Time Proportional Integral Mode (TPi)

Example when Ti = 20

Program 1 on the thermostat is 21°C for 
06:30am and the room temperature is 18°C. 
The thermostat will start the heating at 
05:30am to reach 21°C for 06:30am @ Ti=20.

Example when Ti = 10

Program 1 on the thermostat is 21°C for 
06:30am and the room temperature is 18°C. 
The thermostat will start the heating at 
06:00am to reach 21°C for 06:30am @ Ti=10.

Example – Program 1 on the thermostat is 21°C for 06:30am and the room temperature is 
18°C. The thermostat will start the heating at 06:30am and the heat will start to increase 
then but will switch itself off before it reaches temperature and allow the room temperature 
to increase naturally – this cycle may begin again if the thermostat isn’t reaching 
temperature. 

This menu allows the installer to change the minimum and maximum 
temperature range that the thermostat can be set at. Defaults are 35°C for 
Hi and 5°C for Lo.

This menu allows the installer to change the switching differential of the 
thermostat when the temperature is rising and falling.
HOn is the fall in temperature – Default – 0.4°C. This will allow a fall of 0.4°C 
from the setpoint before the thermostat turns on again. 
HOFF is the rise in temperature – Default – 0.0°C. This will allow the 
temperature to rise 0°C above its setpoint. 

This menu allows the installer to re-calibrate the thermostat. The current 
temperature will be displayed on the screen and can be adjusted by 
pressing the up and down buttons.

P0 5:  Frost Protection

This menu allows the installer to activate or de-activate frost protection. 
When frost protection is activated the thermostat will switch on the boiler 
when the temperature drops below 5˚C.

Exit

This menu allows the installer to return to the main interface. It is also 
possible to exit the installer menu by pressing AUTO, MAN or OFF whilst in 
the installer menu.

22˚C

21˚C

20˚C

19˚C

18˚C

17˚C

Temp

Time Minutes

Heating On

Heating Off

Setpoint Temperature

Proportional Bandwidth

20

0

40

60

80

100

TPi Control 

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:

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

Pb - Proportional Bandwidth: 

This value refers to the temperature below the setpoint 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. 

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 setpoint by too much. It will also 
turn on if the temperature is falling so it doesn’t undershoot the setpoint 
which will leave the user with a more comfortable level of heat. 

6 Cycles

2˚C

ON

20˚C

0

20

40

60

80

100

120

140

160

180

O

ptimum S

tar

t T

ime (M

ins)

Target Temperature Difference ˚C

TTD

8

9

7

6

5

4

3

2

1

Optimum Start Control Graph with Ti = 20

0

15

30

45

60

75

90

105

120

135

O

ptimum S

tar

t T

ime (M

ins)

Target Temperature Difference ˚C

TTD

8

9

7

6

5

4

3

2

1

Optimum Start Control Graph with Ti = 15

0

10

20

30

40

50

60

70

80

90

O

ptimum S

tar

t T

ime (M

ins)

Target Temperature Difference ˚C

TTD

8

9

7

6

5

4

3

2

1

Optimum Start Control Graph with Ti = 10

Boiler 

Plus

20190930_CP4M_OpIns_JW

Operating Instructions

Page 3 of 4

Boiler 

Plus

CP4M Room Thermostat 

 

Hardwired    Open Therm®    

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