Logano SK645/SK745 - Buderus

Table of contents
Table of contents
1 Low temperature boilers . . . . . . . . . . . . . . . . . . 4
1.1 Types and output . . . . . . . . . . . . . . . . . . . . . 4
1.2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Characteristics and special features . . . . . 4
2 Technical description . . . . . . . . . . . . . . . . . . . . . 5
2.1 Equipment level . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Heating water routing . . . . . . . . . . . . . . . . . . 6
2.3 Hot gas routing . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Dimensions and specification . . . . . . . . . . . 7
2.4.1 Logano SK645 dimensions and
specification . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4.2 Logano SK745 dimensions and
specification . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.5.1 Pressure drop on the water side . . . . . . . . 12
2.5.2 Boiler efficiency . . . . . . . . . . . . . . . . . . . . . 13
2.5.3 Standby loss and flue gas temperature . . 14
3 Burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1 Burner selection . . . . . . . . . . . . . . . . . . . . . 15
3.2 Burner requirements . . . . . . . . . . . . . . . . . . 15
4 Regulations and operating conditions . . . . . 16
4.1 Extracts from the regulations . . . . . . . . . . . 16
4.2 Pressure Equipment Directive (PED) and
Health & Safety at Work Act . . . . . . . . . . . 16
4.2.1 Application range . . . . . . . . . . . . . . . . . . . . 16
4.2.2 Categories in accordance with the
Pressure Equipment Directive 97/23/EC 16
4.2.3 Health & Safety at Work Act regarding
steam and hot water boilers . . . . . . . . . . . 17
4.2.4 Overview of the Health & Safety at Work
Act [Germany] . . . . . . . . . . . . . . . . . . . . . . 17
4.3 Operating conditions . . . . . . . . . . . . . . . . . 18
4.3.1 Operating requirements . . . . . . . . . . . . . . . 18
4.3.2 Operating conditions . . . . . . . . . . . . . . . . . 18
4.4 Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.5 Water treatment . . . . . . . . . . . . . . . . . . . . . 19
4.5.1 Definition of terms . . . . . . . . . . . . . . . . . . . 19
4.5.2 Prevention of corrosion damage . . . . . . . . 19
4.5.3 Prevention of damage through scale
formation . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5.4 Requirements for fill and top-up water . . . 20
4.5.5 Application limits for boilers made from
ferrous materials . . . . . . . . . . . . . . . . . . . . 21
4.5.6 Recording the amounts of fill and top-up
water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2
4.5.7 Calculation to determine the permissible
amounts of fill and top-up water . . . . . . . . 23
4.5.8 Chemical heating water additives . . . . . . . 23
4.5.9 Combustion air . . . . . . . . . . . . . . . . . . . . . . 23
5 Heating controls . . . . . . . . . . . . . . . . . . . . . . . . 24
5.1 Logamatic 4000 control system . . . . . . . . 24
5.1.1 Logamatic 4212 control unit . . . . . . . . . . . 24
5.1.2 Logamatic 4321 and Logamatic 4322
control units . . . . . . . . . . . . . . . . . . . . . . . . 24
5.1.3 Logamatic4411 control panel system . . . . 24
5.2 Logamatic telecontrol system . . . . . . . . . . 24
6 DHW heating . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.1 Systems for DHW heating . . . . . . . . . . . . . 25
6.2 DHW temperature controller . . . . . . . . . . . 25
7 System examples . . . . . . . . . . . . . . . . . . . . . . . 26
7.1 Information regarding all system examples 26
7.1.1 Hydraulic connection . . . . . . . . . . . . . . . . . 26
7.1.2 Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1.3 DHW heating . . . . . . . . . . . . . . . . . . . . . . . 27
7.2 Safety equipment to DIN-EN 12828 and
DIN-EN 12953-6 . . . . . . . . . . . . . . . . . . . . 27
7.2.1 Requirements . . . . . . . . . . . . . . . . . . . . . . . 27
7.2.2 Arrangement of safety equipment to
DIN-EN 12828; operating temperature
≤ 105 °C; shutdown temperature (high
limit safety cut-out) ≤ 110 °C . . . . . . . . . . 28
7.2.3 Arrangement of safety equipment to
DIN-EN 12953-6; shutdown temperature
(high limit safety cut-out) > 110 °C . . . . . 29
7.3 Sizing and installation information . . . . . . . 30
7.3.1 Boiler circuit pump in the bypass as shunt
pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.3.2 Boiler circuit pump as primary circuit
pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.3.3 Low loss header . . . . . . . . . . . . . . . . . . . . . 33
7.4 Single boiler system Logano SK645 and
SK745 with boiler control unit . . . . . . . . . 34
7.5 Single boiler system with Logano SK645
and SK745 boilers: Logamatic Boiler and
heating circuit control with hydraulic
separation . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.6 Single boiler system with Logano SK645
and SK745 with boiler and heating circuit
control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.7 Single boiler system with Logano SK645
and SK745 with boiler and heating circuit
control as well as hydraulic balancing . . . 40
6 720 646 816 (10/2010) – Technical guide Logano SK645 and SK745