Instruction Manual
7
1. INTRODUCTION
The X Boiler BD Series is a condensing gas-fired boiler designed for the central heating (C.H.) of residential buildings and
for heating domestic hot water (DHW). Condensing boilers are more efficient, using less fuel (contributing to lower running
costs) than non-condensing boilers. Their increased efficiency means less carbon dioxide is emitted, making them better for
the environment compared to their noncondensing counterparts.
The X Boiler BD Series comes in two types: X Boiler BD 23 and X Boiler BD 38. These boilers can be adapted for use with a
storage tank by an AUTHORISED SERVICE COMPANY.
In C-TYPE installations, the combustion circuit of the boiler is sealed. That is, the boiler is set up to take air needed for
combustion from outside the building. Installations that take the air for combustion from inside the room where the boiler
is installed must meet the stringent conditions required by law. For further information about installations see section 3.8
and PN-EN 15502-2-1: 2013-04.
2. BOILER DESCRIPTION
The X Boiler BD Series with its components labelled is illustrated in Fig. 2.2.1.2 and Fig. 2.2.1.3. Below are the technical
specifications of the boiler:
2.1 TECHNICAL SPECIFICATIONS OF THE BOILER
•
Electronic fluent flame modulation for the central heating system and domestic hot water;
•
Electronic ignition with ionisation flame control;
•
Adjustable boiler power;
•
Regulation of heating water and domestic water temp.;
•
Soft ignition function;
•
Inlet gas pressure stabilisation;
•
Adopted to connect with a closed circuit C.H. system;
2.2. COMPONENTS OF THE BOILER AS ILLUSTRATED IN FIG. 2.2.1.2 AND FIG. 2.2.1.3
5. Fan
7. Pump
8. Gas unit
10. Flame control/ Ignition
electrode,
11. Burner
12. 3-way valve
13. Flue gas-water heat
exchanger
15. Temperature limiter as
a protection against
exceeding the water
temperature upper limit
16. Thermal fuse of flue gas
17. Expansion vessel
18. NTC sensor of heating
water supply
19. Heating water pressure
transducer
20. Air -vent
21. Plate water-water heat
exchanger
22. Filling valve of installation
25. Safety valve - 3 bar
26. Domestic water flow sensor
27. NTC sensor of domestic
water temperature
28. NTC temperature sensor of
heating water - return (only
in boilers with PWM pumps)
29. Siphon
30. Mixing unit
33. Drain valve
Fig. 2.2.1.2. Location of elements in system boiler: X BOILER BD Series
