Elektrobock PT52 User guide

PT52PT52

ROOM THERMOSTAT

with OpenTherm+ communication

MADE IN CZECH REPUBLIC

• LARGE BACKLIT DISPLAY

with intuitive navigation in English

• 9 WEEKLY PROGRAMS FOR
CENTRAL HEATING (C.H.)

6 temperature changes per day

• OPERATION OPTIMIZATION

preliminary switch-on function

• CONTROL TYPE SELECTION

according to room or equitherm control

• 1 WEEKLY PROGRAM FOR
HOT SERVICE WATER (D.H.W.)

3 temperature changes per day

• UP TO 30 % ENERGY SAVINGS

quick investment return

MENU

2

DESCRIPTION

PT52 is intended for controlling gas and electric boilers which use the OpenTherm Plus (OT+) communi­cation protocol. Its great advantages are the backlit display and navigation in CZ/PL/EN/DE/RU.

INSTALLATION AND LOCATION

Install the thermostat at a suitable place where its operation will not be affected by direct fl ow of hot air
from a heating source, by sunshine or other disturbing effects. Do not install it on an external wall either.
The installation height should be at least 1.5 m above the ground. Locate the thermostat in the so-called
reference room, such as the living room (the heat source will be switched according to the temperature
in this room).

The installation can only be done by a person with adequate qualifi cation! Before

installation, disconnect the power supply!

1) Remove the control part from the bottom cover of the device (Fig. 1, page 3).

2) Chip off the plastic piece in the middle of the bottom cover to lead in the conductors.

3) Run the conductors through the hole and connect them to the terminal board acc. to the diagram.

4) Fasten the bottom cover to the wiring box by means of screws (Fig. 2, page 3).

5) Mount the control part onto the bottom cover.

6) Upon the fi rst start (or reset), the thermostat shows the “SET TIME” message; set the current
time and date acc. to the instructions on page 5.

7) To change the navigation menu language, follow page 8 (Czech set by default).

8) Ask the boiler manufacturer, whether it communicates by means of the standard OpenTherm Plus
protocol

(for the Thermona, Ferolli and Viessmann boilers, change the constant No. 26, see page 13).

Wiring diagram:

Backlit display

After you press any button, the display is backlit automatically for at
least 5 s (activated within 30 min after connecting the OT line).

Controls

turning

= change of temperature setting

short press = selection (entry) confi rmation

= quick change of required
temperature or program (see page 3);
viewing other information (see page 4)

long press = step back (only in the CONST mode,

page 8)

press = opening the main menu or returning

a step back

PT52

BOILER

*

*

OpenTherm communication line,

max. length of 50 m, no polarity

The OpenTherm
communication terminals
are marked differently
with every boiler type;
therefore, observe the
electric connection
recommended by the
boiler manufacturer!

TEMP. IN AUTO

TEMP. IN MANU

1

2

4

6

7

89

10
11

13 14

15

16

17

18

19

3

5

12

3

Fig.1

USER TIPS

Fig.2

QUICK CHANGE OF REQUIRED TEMPERATURE / PROGRAM

Press twice the“

“ button; the required temperature starts fl a-

shing on the display. Change the required temperature by turning
the “ “ button and press the “ “ pbutton for further informati-

on, or “ “ to return to the main menu.

In the AUTO mode, the change will last until the next program
change. In this mode, another program can be selected in the

same way.

In the MANU mode, the change is permanent.

By successively pressing the “ “ button, you can view further informa­tion on the: required temperature of hot service water, external tempera­ture, central heating temperature, boiler output, and operating hours of
the central heating and hot service water; for detailed description, see
page 4.

MENU

1, Current day (in the
Prog mode, selection
of days to be
programmed)
2, Heating on indication
3, Hot ser vice water
indicator
4, Central heating
indicator
5, Current room
temperature
6, Anti-freeze temperature
7, Modes for setting
programs (PROG) and
constants (CONST)
(page 6 and 8)
8, Automatic mode
(page 5)
9, Manual mode (page 5)
10, Holiday mode (page 5)

11, Clock setting mode
12, Permanent shut-off
(page 5)
13, Summer mode
14, Boiler inspection indic.
15, OpenTherm (OT+)
communication indic.
16, Current time
17, Current date/
required temperature/
modulation output in %
(in the CONST mode,
for example, number
of the equitherm curve;
for details, see page 9 )
18, Status line, dynamically
changing according to
the running process
19, Key lock indication

OPER HOURS CH

OPER HOURS dHW

OUTSIdE TEMP

TEMP ANd POWER

4

C.H. OPERATING HOURS

FURTHER INFORMATION

Value of the boiler operating hours for central heating. The LCD value means 906
hours and 43 minutes (the maximum value is 9999 hours and 999 minutes).

Resetting hours:

After displaying the operating hours, turn the “ “ button
anti-clockwise.

HOT SERVICE WATER OPERATING HOURS

Value of the boiler operating hours for hot service water heating. The LCD value
means 906 hours and 43 minutes (the maximum value is 9999 hours and 999

minutes).

Resetting hours:

After displaying the operating hours, turn the “ “ button
anti-clockwise.

INFORMATION ON EXTERNAL TEMPERATURE

Information on the current external temperature provided
a sensor is connected to the boiler!

INFORMATION ON C.H. TEMP. AND MODULATION OUTPUT

Required C.H. = C.H. temperature calculated according to the equi-

therm curve selected, irrespective of the possible min. and max. tempera­ture of C.H. water; the value in brackets is the required temperature with

respect to the min. and max. C.H. temperature set (see page 7).

Current C.H. = current central heating water temperature
Modul. power = modulation power of the boiler in %

ERROR MESSAGES

If the communication line between the thermostat and boiler is disconnected or interrupted,
the LCD displays the “LINE DISCONNECTED” message (at fi rst connection, the thermostat
must be connected via the OT line to the boiler for about 30 minutes).

This system features a long time of clock operation backup – for more than 7 days!
The thermostat must be connected to the OT line for at least 2 days.

In case of a too long communication line failure, you must set the date and time, but the con­stants and programs remain saved in the thermostat!
In this case, the “SET TIME” reminder appears on the last line of the display.

The OpenTherm protocol allows sending of error messages of different importance from the
boiler to the thermostat. PT52 shows these messages on the last line of the display:

- E xxx , where the xxx value may be 001 to 255. This type of errors may vary according to the boiler
manufacturer; therefore, you must contact a service technician or the manufacturer. The errors may
include, for example: wrong fl ue gas exhaust, external temperature sensor error, etc.

- Temp. measurement error = the internal sensor of the thermostat is faulty; contact the manufacturer.

- OPT error - central heating temperature = information on the current central heating temperature not
received from the boiler, contact the boiler service.

By successively pressing the “

“ button in the AUTO/MANU modes, you can view further information which

the boiler sends to the thermostat (attention: this information may differ according to the boiler type):

Additional information may be displayed: fl ow of water in liters, and temperature return!

AUTO MOdE

MANUAL MOdE

OFF MOdE

HOLIdAY

SET TEMP.

SET TIME

SET HOUR

5

OPERATING MODES

Pressing any button fi rst, you activate the display backlit. By another short press of the
“ MENU “ button, you open the main menu in which you can choose operating modes.

AUTO

The thermostat works according to the weekly program settings (this
program can be changed; for detailed description, see PROG, page 6).

MANU

(default temperature setting of 21°C)

The thermostat works according to the temperature setting until the next
manual change.

OFF

The thermostat is switched off until the next manual change of the
mode.

HOLIDAY

The thermostat maintains the preset temperature until the preset date and
selected time. After expiry of the preset period, it automatically returns to
the AUTO / MANU mode last selected before the holiday.

Press twice the “ MENU “ button, choose the AUTO mode by turning the
“

“ button, and press the “ “ button to confi rm.

(the Pr3 weekly program set by default, see page 6)

Press twice the “ MENU “ button, choose the MANU mode by turning the
“

“ button, and press the “ “ button to confi rm.

(the anti-freeze temperature of 3 °C is kept – cannot be changed)

Press twice the “ MENU “ button, choose the OFF mode by turning the
“

“ button, and press the “ “ button to confi rm.

Press twice the “ MENU “button, choose the mode by turning the
“ “ button, and press the “ “ button to confi rm.
Step by step, set the temperature which the thermostat should keep du­ring the holiday, date and time of your return from the holiday. Change the
values by turning the “ “ button and confi rm each change by pressing
the “ “ vbutton. After making the settings, press the “ “ button to
return to the basic screen.
Note: The holiday mode can be cancelled any time by selecting another
AUTO or MANU mode.

CLOCK SETTING

Setting the correct time and date.

Press twice the “ MENU “ button, choose the CLOCK mode by turning the
“

“ button, and press the “ “ button to confi rm.
Change the time by turning the “ “ button and confi rm each change
by pressing the “ “ button (the parameter modifi ed is always fl ashing);
pressing the “ “button, you return to the menu.

PROGRAMMING

SELECT dAY

TIME CHANGES

SELECT PROGRAM

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

program No.3

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

program No.4

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

program No.5

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

program No.6

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

program No.7

U

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

L

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

program No.1

program No.2

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

6

PROG

You can set up to 9 weekly programs for central heating (6 temperature
changes per day). The Pr1 and Pr2 programs are empty; Pr3 to Pr7
programs are set by default. The PrU and PrL are also set by default,
intended for the EVEN/ODD week (see page 12). Further, you can set
1 weekly program for hot service water (see page 7).

Press twice the “ MENU “ button, choose the PROG mode by turning
the “

“ button, and press the “ “ button to confi rm.
The selected program number is blinking on the display. Turning the “ “
button, choose the program which you want to change and press
the “

“ button to confi rm. Turning the “ “ button, choose the days
to be programmed (you can program day-by-day or 1-5 = Mon-Fri,
6-7 = Sat-Sun, or 1-7 = Mon-Sun) and press the “

“ button to con­fi rm. The 1st change time starts fl ashing; set the time by turning the
“

“ button (by minimum steps of 10 min) and press the “ “ button
to confi rm. Set the temperature for this time by turning the
“

“ button and press again the “ “ button to confi rm. The 2nd
change time appears on the display. Proceed in the same way as
with the fi rst change setting.
In this way, you can set up to 6 temperature changes per day.
To return one step back, shortly press the “

“button; to return to the

main menu, press the “ “ button long.

After changing the preset program, check whether all the changes
made conform to your requirements!

It is not necessary to apply all six changes to one day!

(PROGRAMMING)

Change in the central heating program settings:

Tables of temperature programs for central heating:

Note:

5/21 means
that the required
temperature at 5

o’clock is 21 °C

All the
indicated
programs

can be

changed!

SELECT dAY

TIME FROM

SELECT PROGRAM

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

The optional t program - for the TUV reheating

Intervals

FROM TO

FROM TO

FROM TO

7

In the hot service water program (Prt), you can set 3 time intervals
with different temperatures (the minimum step is 1 hour).

Press twice the “ MENU “ button, choose the PROG mode by turning
the “ “ button, and press the “ “ button to confi rm.
The selected program number is blinking on the display. Turning the “ “
button, choose the Prt program and press the “ “ button to
confi rm. Turning the “ “ button, choose the number of days to be
programmed (you can program day-by-day or 1-5 = Mon-Fri, 6-7 =
Sat-Sun, or 1-7 = Mon-Sun) and press the “

“ button to confi rm.
The 1st time from starts fl ashing; set the switch time by turning the
“

“ button and press the “ “button to confi rm. The 1st time to
appears; set the switch-of time by turning the “ “ button and press
the “ “ button to confi rm. Set the temperature for this time by tur­ning the “ “ button and again press the “ “ button to confi rm. The
2nd time from appears on the display. Proceed in the same way as
with the fi rst change setting.
In this way, you can set up to 3 temperature changes per day.
To return one step back, shortly press the “

“, button; to return to

the main menu, press the “ “ button long.

Change in the hot service water program settings:

Table of the hot service water temperature program:

The program preset for hot

service water:
whole week (1-7)
whole day (0-24)

temperature 50 °C.

This program can be changed

any time!

If you just want to change the hot service water temperature
temporarily, use the possibility of a short-term change of hot service
water temperature:

REOUIR TEMP dHW

Press the “ “button four times; the value of the required hot
service water temperature, set in the hot service water tempera-

ture program (Prt), appears on the LCD.

Turning the “ “ button, change the required temperature
and press the “

“ button to return to the main menu.

0 = off, range from 10 to 65 °C, by 1°C.

TEMP.

TEMP.

CONSTANTS

ENGLISH

MIN TEMP CH

5 MAX TEMP CH

8

2

3

The temperature limit below which the programmed tempera­ture cannot be set.
Choose within the range from 3 °C to 10 °C (by 0.5 °C).

4

MINIMUM CONTROL TEMPERATURE

Set the value by turning the“

“ button and press the “ “

button to confi rm.

MAXIMUM CONTROL TEMPERATURE

(5 °C set by default)

(39 °C set by default)

The temperature limit above which the programmed tempera­ture cannot be set.
Choose within the range from 15 °C to 39 °C (by 0.5 °C).

Set the value by turning the“

“ button and press the “ “

button to confi rm.

5

MINIMUM CENTRAL HEATING TEMPERATURE

(30 °C set by default)

This defi nes the lower limit of the required heating water tem­perature, as calculated by the thermostat, at which the boiler
can start heating. This constant hinders unnecessary ignition
of the boiler. Choose within the range from 5.0 °C to 50.0 °C
(by 1.0 °C).

Set the value by turning the“

“ button and press the “ “

button to confi rm.

MAXIMUM CENTRAL HEATING TEMPERATURE

(70 °C set by default)

This defi nes the upper limit of the required heating water tem­perature, as calculated by the thermostat, which the boiler
must not exceed. The maximum-minimum temperature diffe­rence must be higher than 8 °C. Choose within the range from

13.0 °C to 85.0 °C (by 1.0 °C).

Set the value by turning the“

“ button and press the “ “

button to confi rm.

CONST

Setting the control parameters.

1

CESKY

Press twice the “ MENU “ button, choose the CONST mode by turning the
“

“ button, and press the “ “ button to confi rm.

Language selection (CZ/PL/EN/DE/RU/SK).
Choose the language by turning the “

“ button and press the

“ “ button to confi rm.

(CONSTANTS)

(Czech language set by default)

6 ROOM CONTROL

6 HEAT CURVE

7 CONTROL INT

8 CONTROL ZONE

Preset temperature

Proportional
band

Heating on at
100 % of the
working cycle

of the working
cycle

Informative value – the real one is calculated by the thermostat

9

6

CONTROL TYPE SELECTION

(“ROOM CONTROL” set by default)

ROOM CONTROL = PI control (according to the internal temperature),
The thermostat is heating according to the
reference room temperature. You must set the
PI control parameters – constants No. 7 and 8!!

1 - 60 = EQUITHERM control, the 1 to 60 number

corresponds to the required heating curve (see
page 10). If choosing the equitherm control, follow
the instructions stated at the heating curve graph.

Select the control type by turning the “

“ button and press

the “ “ button to confi rm.

8

7

CONTROL INTERVAL OF PI CONTROL

(10 minutes set by default)

To be selected according to the object thermal inertia.
The optimum setting is usually 10 to 15 minutes.
Selectable range of 5 to 20 minutes (by 1 min).

The interval length in minutes infl uences the system oscillation.
The lower the value, the higher the risk of oscillations.

Set the value by turning the “

“ button and press the “ “ button

to confi rm.

CONTROL BAND OF PI CONTROL

(2 °C set by default)

Only if PI control is selected (constant 6 = without equitherm)
The so-called “proportional band” specifi es the moment at which the
thermostat starts limiting the central heating temperature (when the
PI control starts). Selectable range of 0.5 °C to 3.0 °C (by 0.1 °C).

Set the value by turning the “

“ button and press the “ “ button

to confi rm.

PI CONTROL SELECTED, CONSTANT NO. 6 SET “BY ROOM”:

9 SHIFT OF CURVE

designation of curves

required temperature of

heating system [°C]

external sensor
temperature [°C]

10

9

SHIFT OF THE CURVE

(value 5 set by default)

1 - 20 = manual correction by coeffi cient, can be used if
the temperature is still not according to your requirements (by

0.5).

If you choose the manual correction, set the heating curve shift coeffi ­cient, at which you will achieve the heating water control according to
the current external temperature (the above formula) at various requi­red temperatures in the reference room.

EQUITHERM CONTROL SELECTED, CONSTANT NO. 6 SET TO „ 1-60“ :

If you choose a required room temperature different from 20 °C, the thermostat automatically
calculates a curve shift according to the following formula, where the coeffi cient is 1:

shift = (required temperature – 20) * coeffi cient

Note: The curve most frequently used in our conditions is approx. 9-11 for low-temperature sys­tems, and approx. 15-17 for classical heating systems.

It is suitable to choose the equitherm control for large objects in which no reference room can be speci­fi ed. The equitherm control principle consists in optimisation of the heating system water temperature
according to the external temperature. This relationship is visualized by the below equitherm curves (for the

required room temperature of 20 °C), according to which the required temperature of the heating system water
is selected. The thermostat calculates the heating water temperature according to the equitherm curve selected,
and then sends it to the boiler. Next, the boiler maintains the water temperature at the required value. To prevent
permanent over- or underheating of the object, you must choose the curve steepness according to the heating
system. Selection of the correct curve for the given system is a long-term task, and the system must be tested
at various external temperatures! It is suitable to adjust the internal temperature in the rooms, for example, by
thermostatic heads control. The heating system water temperature is restricted by the min. and max. limit

set by the constants No. 3 and 4! During this control, the external sensor must always be connected to
the boiler!

If this control is selected, the external sensor delivered with the boiler must be installed!

10 MId INSULAT

11 CONTROL INT

9 AUTO SHIFT

12 REACTION RATE

external sensor
temperature [°C]

required temperature of

heating system [°C]

11

11

10

BUILDING INSULATION

(“middle” set by default)

The speed of temperature change in the room at frequent variations
of external temperature depends on the building structure and insulation.
This constant enables you to take the temperature change speed into
account according to the type of the building heated
(at equitherm control only).

bad = uninsulated building, quick response to external temperature changes
middle = insulated building, slower response to external temperature changes
good = well insulated building, slowest response to external temperature changes

Set the type by turning the “

“ button and press the “ “ button to confi rm.

CONTROL INTERVAL OF EQUITHERM CONTROL

(10 minutes set by default)

Selected according to thermal inertia of the object. The optimum
setting is usually 10 to 15 minutes.
Selectable range 5 min to 20 min (by 1 min).

The interval length in minutes infl uences the system oscillation.
The lower the value, the higher the risk of oscillations.

Set the value by turning the “

“ button and press the “ “ button.

During this control, the heating curve is automatically corrected depending on both the external temperature and the
current temperature in the reference room where the thermostat is located. Thus you can achieve a higher temperature

comfort in the heated room, optimum operation of the heating system, and thus also higher savings! For this control, the
external sensor must always be connected to the boiler and constant No. 9 must be set to “AUTO”!

AUTO = automatic correction, according to the internal

temperature measured in the reference room. This
option can only be used after a correct equitherm curve
has been selected!
Select the correction by turning the “

“ button and press the “ “

button to confi rm.

12

RESPONSE SPEED

(value 11 set by default)

It is only active in case of selection of equitherm control with automatic
correction according to external temperature! This determines how
quickly the required temperature is achieved. The selectable range is 1
to 16 (by 1).

If the response speed is 1, the required temperature is achieved slowly, which prevents
a possible overswing, but the required temperature is achieved later.
If the response speed is 16, the heating up to the required temperature in case of its
change is immediate, but overswing occurs.

Set the value by turning the “

“ button and press the “ “ button.

The example describes selection of the equitherm
curve No. 13 (pink) and its correction calculated
with the coeffi cient 2.5 (for required temperatures
in 24 °C and 16 °C room). Thus you can achieve
optimum system settings at which the heating sys­tem water temperature is controlled according to
the current external temperature.

16 TEMP CORREC

13 PRE- SWITCH M

14 SUMMER MOdE

15 Odd-EVEN MOdE

22

LOCK

12

16

This is used for correcting the temperature measured by the
thermostat. The setting can only be done after 12 hours of operation,
when the internal sensor temperature has settled. Measure the
ambient temperature with a thermometer; if it is different from the
temperature on the thermostat, set the correction within the range of

-5 °C do +5 °C.

TEMPERATURE CORRECTION

Set the correction by turning the “

“ button and press the “ “

button to confi rm.

(0 °C set by default)

13

This function guarantees you the required temperature at the required
time. You need not consider when to switch the heating on in order to
be warm when getting up in the morning without heating unnecessarily
long in advance. You just need to set the temperature program in the
Prog mode and enable this function. Within two operating days, the
program ascertains the thermal constants of the room and then it swi­tches the heating on in advance suffi ciently. The preliminary switch-on
time is limited to 2 hours.

PRELIMINARY SWITCH-ON OF HEATING

Set YES/NO by turning the “

“ button and press the “ “ button

to confi rm.

(NO set by default)

14

In this mode, you are not allowed to switch the heating on. It can par­ticularly be used in the summer period, when you need not heat. After
you enable this mode, the “ “ symbol appears on the display.
Note: The anti-freeze protection (3 °C) and the hot service water
function are still enabled. In this mode, you cannot change the
temperature or set the holiday mode!

SUMMER MODE

Set YES/NO by turning the “

“ button and press the “ “ button

to confi rm.

(NO set by default)

15

If you choose “YES”, the programs PrU and PrL will alternate
automatically according to the current week (even/odd).
This setting is suitable, for example, for shift operation (the
requirements on thermal comfort in the object change every week).

EVEN-ODD WEEK SELECTION

(NO set by default)

Set YES/NO by turning the “

“ button and press the “ “ button

to confi rm.

KEY LOCK

This is used for locking the controls as a protection against
undesirable interference of a foreign person.

22

Set YES/NO by turning the “

“ button and press the “ “ button

to confi rm.

(NO set by default)

23

KEYCOdE

24

SERVICE dAY

26 bOILER TYPE

28

VERSION

27

PASSWORd

13

28

VERSION (restoring the default settings)

Firmware version, informative parameter only.

If you press the “

“ button long (for about 3 s), the RESET message
appears shortly on the LCD and the thermostat returns to the default
settings!

KEY CODE

This constant can be set if CONST 22 = YES. It is used for setting the
code by which you will be able to activate the controls.
Set a four-digit combination (range from 0 to 9).
The keys will be locked within 1 minute (after opening the basic
display). The “ “ symbol appears on the LCD..
If you press the “

“ or “ “ button, the LCD asks you to enter the
key code; after entering the correct code, you are able to make any
changes (the controls are functional again).

23

BOILER INSPECTION REMINDER

Set the date on which you want to be informed about the necessity of
the prescribed boiler service. At the required time, the “MAINTENAN­CE NECESSARY” message and the “ “ symbol will appear on the
bottom line of LCD (you can cancel the message by setting a new date
for the next boiler maintenance!).

24

Gradually set 4 digits by turning the “

“ button; confi rm each setting

with the “ “ button.

RECOMMENDATION: - record the key code in the table

- you can cancel the code by setting CONST 22 to NO, or by
restoring the default settings of the thermostat (see CONST 28).

YOUR CODE

Gradually set the day, month and year by turning the “ “ button,
confi rm each setting with the “ “ button.

(1.1.2030 set by default)

26

BOILER TYPE

(1 set by default)

Possibility of selecting a boiler which has the OpenTherm
communication adjusted.

1 - universal (suits most boiler types)
2 - Thermona gas boilers
3 - Thermona electric boilers
4 - Ferolli
5 - Viessmann

27

PASSWORD

(not set by default)

It is used for locking the constants related to the given control set­tings. Suitable for service technicians. After a numerical code

has been entered, the user cannot change constants No. 6, 7, 8,
9, 10, 11, 12 and 26. When entering the mode CONST and browsing

in the constants you can see symbol key „ „ which appear near
the constants. These constants are blocked and you must to know
password for change the constants!

Choose the boiler type by turning the “

“ button and confi rm with the “ “ button.

Turning the “ “ button, gradually enter four digits and confi rm each
setting with the “ “ button.

Pb

LEAD FREE

in compliance with RoHS

136.5

28.5

83

ELEKTROBOCK CZ s.r.o.

Blanenská 1763
Kuřim 664 34
Tel./fax: [phone]

MADE IN CZECH REPUBLIC

In case of guarantee

or post-guarantee
service, send the

thermostat to the

manufacturer’s

address.

ROOM THERMOSTAT

with OpenTherm+ communication

CERTIFICATE OF GUARANTEE

(guarantee period for the product amounts to 2 years)

product No.:

date of sale:

stamp of shop:

examined by:

Technical parameters

Power supply

through the OT+ communication line
from the boiler

Communication line
length
polarity

twin-lead
max. 50 m
without polarity

Communication type two-way, OpenTherm Plus

Min. program. time of C.H. 10 minutes

Min. program. time of H.W. 1 hour

Adjustable temp. range 3 to 39°C

Adjustable temp. range C.H. 5 to 85°C

Adjustable temp. range D.H.W. 0, 10 to 65°C

Measurement accuracy ±0,5°C

Protection class IP20

Relative humidity < 85% RH

Working temperature 0°C to +40°C

Dimensions:

 9 weekly programs for central heating

 6 temperature changes per day

 1 weekly program for hot service water

(3 temperature changes per day)

 programming by 10 minutes and 0.5 °C

 possibility of programming day-by-day or

Mon-Fri, Sat-Sun and Mon-Sun

 large backlit graphic display

 control type selection (PI control or

equitherm control)

 preliminary heating switch-on function

 quick change of the required C.H. temp.

 quick change of the required D.H.W.temp.

 manual mode (MANU)

 permanent shut-off (OFF)

 HOLIDAY mode

 summer mode

 even-odd week selection

 current temperature correction

 key lock

 service password (to lock the control

constants settings)

 indication of calculated and current

temperature of central heating

 indication of the boiler modulation

output in %

 operating hours sum for central heating

and hot service water

 boiler maintenance indication

 anti-freeze protection (3 °C)

 automatic SUMMER / WINTER time

changeover

 clock operation backup for about 8 hours

PT52 offers new possibilities of controlling boilers with the OpenTherm Plus
communication. The selected language menu with list of functions facilitates
and quickens work during setting the controller in your system. The OpenTherm
communication enables optimum operation of the boiler and heating system
including hot service water, which results in longer boiler life and higher savings.

www.elbock.cz

Characteristics:

PT52