ELEKTROBOCK PT21 Operating Instructions Manual page 5

Pic.1
PT21
battery compartment
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.
Procedure:
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.
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 " Test " button for testing)
The installation of PT21 may be performed only by a person with appropriate
progr.
day
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Pic.1a
use only alkali battery
2x1.5 V type AA/R6
qualification in electrical engineering.
Table for registration of your programs
1 2
ON
Boiler connection
BOILER
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
3 4
Pic.2
openings for mounting screws
5 6