6
PK 550
18/03/2016 - 300020192-02
3.
Technical description
3 Technical description
3.1 General description
PK 550 boilers are intended for central heating using radiators or
underfloor heating. These boilers have the following characteristics:
- Hot-water boiler
- Heating body in cast iron,
- Pressurised boiler,
- Boiler to be fitted with a gas or oil pressure jet burner
-
X
or
R
control panel (See below)
- Production of domestic hot water can be ensured by a separate hot
water calorifier.
- Connecting to a chimney
3.2 Control panels
PKX 550: Boiler with standard X control panel
Panel comprising the settings, control and safety devices allowing
the boiler to operate autonomously, without regulation.
The standard panel is used to connect the boiler to the boiler room
control cabinet.
This cabinet can be fitted with control units.
PKR 550: Boiler with R control panel.
The control panel enables the operation of a boiler fitted with a 1
stage, 2 stage or modulating burner.
Control system based on outside temperature if a regulator has been
installed (see options).
3.3 Operating principle
Boiler with X control panel:
The operation is controlled by the boiler thermostat or by the
control system located in a cabinet, according to the heating
request.
Boiler with R control panel:
If the boiler is fitted with a REA control unit, the boiler
temperature is modulated by the regulator, which controls the
burner and the motorised mixing valves depending upon the
outside temperature.
For boilers which are not equipped with a REA regulator, either a
room thermostat: The operation is controlled by the boiler
thermostat, according to the heating request.
M000483
l
0
30
10A
TEST
STB
6A
l
0
2
M000553
1
1
2
30
