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ROOM THERMOSTAT
PT21
COMFORT PROGRAMMING DIRECTLY
IN YOUR CHAIR
- FOR ALL TYPES OF HEATING
AND AIR-CONDITIONING
SYSTEMS
- ENERGY SAVING UP TO 30%
MADE IN CZECH REPUBLIC
Indication
of day
Real or
set time
Switching on
of the boiler
Program
number
Time setting
Manual operation
Indication of
HOLIDAY mode
Indication
of low battery
Seconds or
temperature
Mode indication
- P required temp.
- H sum
- C Copy
- O Off
Display description:
Description of elements:
Next step, information
on required temperature
Function switch
Switching off
of the boiler,
reset
of boiler
operating
hours
Boiler testing
Setting hysteresis
Sum of boiler
operating hours
Copying
of programs
Holiday function
Change of the day
Setting the time
in program
Regulation of temperature,
or +/- minutes, setting
of current time,
reset of seconds
Installation of PT21:
Install the thermostat on a suitable place, where its operation would not be influenced by
direct flow of hot air from the heater, by solar radiation and other disturbing influences. Also
avoid the installation on outer wall.
PT21 thermostat consists of two parts: the front one - the microprocessor one (Pic.1) and
rear one - the switching one. In this way very easy and quick installation of the
thermostat into installation box of KU/KP68 type is achieved and very comfortable
programming directly from your armchair.
Procedure:
1. Open the case of PT21 in the place indicated by arrow on Pic.1 and so divide the thermostat to two parts.
2. Grasp the rear (switching) part and fasten it into installation box (see Pic.2) at the height of minimally 1.5 m.
3. Unscrew the screw as indicated by arrow (Pic.2) and lift of the cover. Under this cover, there is the relay
and terminal strip, to which the cables from boiler should be connected (Pic.2).
4. Grasp the front part of PT21, slide of the cover (Pic.1a), insert two pencil alkali batteries 2x 1.5 V and
program the thermostat according to operating instructions.
5. Afterwards, snap the front part from above to the lower part of PT21 and the thermostat is ready for
operation. (We recommend to use " Tes t " button for testing)
The installation of PT21 may be performed only by a person with appropriate
qualification in electrical engineering.
ROOM THERMOSTAT PT21
PT21 is a digital room thermostat for automatic regulation of heating,
offering the possibility to set 6 different temperatures (5 to 40°C) for
each day (minimal duration of time interval to be set is 10 minutes).
Further advantages:
- different temperature program for each day
- setting the HYSTERESIS in the range from 0.1°C to 1.5°C
- simple control and programming
- possibility to make a short-term change in program temperature
- easy installation to all types of installation boxes KU/KP68
- economic mode "holiday" for maximally 99 days ( )
- low power consumption
- copying of days by a single button (Kopi)
- information on operating hours of the boiler (Suma)
- temperature regulation at steps of 0.5°C
- multifunctional display
- retention of memory contents, when the batteries are replaced
sooner than after approx. 25s
Specification PT21:
Power supply alkali batteries 2 x 1,5 V typ AA/R6
Number of adjustable temp. for each day 6 different temperatures
Hysteresis 0,1; 0,2; 0,3; 0,4; 0,5; 1,0; 1,5°C
Minimal programming time 10 minutes
Range of possible temp. 5 to 40°C
Step of temperature setting 0,5°C
Minimal step of indication 0,1°C
Measurement accuracy 0,5°C
Output relay, max. 5A/250V AC
CERTIFICATE OF GUARANTEE
(guarantee period for the product amounts to 2 years)
product No.:
date of sale:
stamp of shop:
examined by:
MADE IN CZECH REPUBLIC
ELEKTROBOCK CZ s.r.o.
Blanenská 1763
Kuřim 664 34
Tel./fax: +420 541 230 216
http:// www.elbock.cz
Send the thermostat for guarantee and after-guarantee service
to manufacturer's address.
Table for registration of your programs
1 23456
Mon
Tue
Wed
Thu
Fri
Sat
Sun
day
progr.
Temperature and
time set
Pic.1
Pic.1a
PT21
BOILER
battery compartment
use only alkali battery
2x1.5 V type AA/R6
Pic.2
ON
Terminals 1 and 2
are interconnected
when the thermostat
is switched on
Terminals 2 and 3
are interconnected
when the thermostat
is not switched on
openings for mounting screws
Boiler connection
pt21_en.qxd 23.6.2006 16:39 Page 1
PT21 is a Czech product that offers a wide range of application for tempera-
ture regulation in households, offices or workshops. It is designed in such
way, so that it meets high standard of required functions and simultaneously
easy handling is maintained.
Setting the hysteresis in the range from 0.1°C to 2°C represents a great advantage.
By using the digital thermostat, you can significantly save the energy necessary for heating
and simultaneously to keep optimal thermal comfort. Thanks to rich programming features
(up to 6 time intervals and temperatures for each day) you can define program suiting to
your needs.
ROOM THERMOSTAT PT21
For example:
We get up at 6:00 in the morning, so we select the temperature of 19°C.
We leave the house for work at 8:00 so the temperature can be lower: 17°C.
Family members return home at 14:00, they need warmth, so we set the
temperature to 20°C.
We want to watch TV in the evening and have pleasant warmth, so we set next
interval for 19:00: 24°C.
We are ready to go to bed on 22:00, so the temperature of 18°C is sufficient.
It is dealing with a model of daily temperature regime using 5 time intervals.
OPERATING INSTRUCTIONS
Switch functions: (from left side)
1. AUT : the thermostat works according to program as set
in advance.
2. MAN : serves for manual setting of temperature, the temperature
should be constant up to next change. Symbol " " is
showed on the display.
3. HOD : setting of present day and time
When you set the switch into HOD position, time is shown on
the display and indication of clock is blinking.
By means of "+/-" buttons set required data, confirm by
pressing " i "(register).
Use the same procedure for setting the minutes, seconds and
day (the day is indicated by " " symbol).
4. PROG : position for programming
How to proceed during programming:
PT21 enables to set 6 temperature intervals for one day and also the
HYSTERESIS in the range from 0.1°C to 1.5°C.
1. By successive pressing of " Den, +/-Hod, +/-min. and +/- °C " buttons set the
day, the first time and the temperature within the program.
2. By pressing of " i " button you pass on the setting of the second time and
temperature.
3. For further temperatures within the same day set different time and temperature by
"+/-Hod, +/-min.,+/- °C " buttons. After setting the last temperature for one day,
PT21 passes automatically to the setting for next day. Display shows " " symbol
for next day.
4. After completion of the program for whole week, recheck the program again.
By pressing " i " button we can successively verify whether the program complies
with our requirements and we register it in the table contained in Operating
instructions (for the case of program deletion from memory).
After switching to AUT position, thermostat starts to work according to defined program.
N
ote: If we do not need to use all six settings for one day, we can use a quick zeroing
- by successive pressing of " Off " button we can zero not used time intervals.
Short-term change of temperature in AUT mode (PARTY):
By simple pressing of "+/-°C" button in AUT mode, it is possible to make a
short-term change of required temperature. Symbol " P " is displayed.
The thermostat will maintain this temperature up to next temperature change
as defined in the program. When the " i " button is pressed in AUT mode,
required program temperature is displayed for a while (indicated by " P " on the
display).
Function of " K " button:
By pressing the " K " button in PROG mode it is possible to set HYSTERESIS
( 0.1; 0.2; 0.3; 0.4; 0.5; 1.0; 1.5°C) and confirm it by " i " button.
Function of " Kopi " button:
This function facilitates programming of the thermostat.
Program from one day can be copied by simple pressing of
" Kopi " button to subsequent day.
1. Day indicator has to mark the day that has to be copied to
next day.
2. Press " Kopi " button and whole program copies itself to next day and day
indicator moves. Symbol " C " (Copy) displays for a short time.
Function (holiday):
This function is very useful in the course of holidays, when the
house is empty and it is not necessary to change room temper-
ature. After pressing " " button, symbol " " is displayed.
By means of " +/-Hod and +/- °C" buttons set the number of
days and required temperature.
Example: On Sunday, we leave for 7-day holiday (we should return on Sunday)
and we require constant temperature of 18°C. On Sunday, before we leave, we set
the PT1 thermostat to mode, namely in following way:
1. Select AUT or MAN by function switch.
2. By pressing " " button switch to holiday mode.
3. By pressing "+/-Hod" buttons set the number of days, e.g. 7, because
we should return on Sunday and we want the thermostat to return to AUT
or MAN mode and work according to the program as set.
4. Finally, set the temperature with using of " +/- °C " buttons according to
season, for example 18°C in the summer.
From now on, the thermostat will maintain constant temperature of 18°C for the period of 7 days.
One day from total number of the days set is deducted at each midnight.
Function of " Suma " button:
This is an informational button that displays the number of boiler
operating hours. Symbol " H " is shown on the display.
These hours can be reset by pressing " Off " button.
(Ex
ample: 1206 hours 23 minutes)
Function of " Off " button:
RESET button:
By pressing of this button the boiler is switched off. This
condition is indicated on the display by " O " symbol and
can be cancelled by the same button or by changing the
switch position. In AUT mode, Off function is cancelled by
next program temperature change.
On the rear side of the microprocessor part, there is a button that should be used
in the case of indeterminable conditions - all saved changes will be lost.
Replacement of batteries:
Use only alkali pencil batteries 2x1.5 V of AA/R6 type. The thermostat is
able to preserve all information in its memory for time interval of approx.
25 s. Low battery is indicated on the display by " " symbol.
N
ote: Longer pushing of all buttons speeds up their functions. Blinking of
indicates a free part of the program. Last change of temperature
is maintained as set.
_
_
Function of " Test " button:
This button serves for the testing of correct connection of thermostat and
boiler. Pressing " Test " button causes several switching on/off of the boiler.
pt21_en.qxd 23.6.2006 16:39 Page 2
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