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Junkers MKB 400-3 A Manual

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Contents
6 720 645 817 (2010/09)
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Contents
1 System schemes . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 System scheme 1: unmixed heating
circuit, low loss header . . . . . . . . . . . . . . 4
1.2 System scheme 2: unmixed underfloor
heating circuit, low loss header . . . . . . . 6
1.3 System scheme 3: mixed heating
circuit, DHW circuit, low loss header . . . 8
1.4 System scheme 4: one unmixed heating
circuit, one mixed heating circuit,
low loss header . . . . . . . . . . . . . . . . . . . 10
1.5 System scheme 5: two mixed
heating circuits, one DHW circuit,
low loss header . . . . . . . . . . . . . . . . . . . 12
1.6 System scheme 6: one unmixed heating
circuit, two mixed heating circuits,
low loss header . . . . . . . . . . . . . . . . . . . 14
1.7 System scheme 7: one unmixed heating
circuit, three mixed heating circuits,
low loss header . . . . . . . . . . . . . . . . . . . 16
1.8 System scheme 8: two mixed
heating circuits, two DHW circuits,
low loss header . . . . . . . . . . . . . . . . . . . 18
1.9 System scheme 9: one unmixed
heating circuit, one DHW circuit,
low loss header, cascade . . . . . . . . . . . 20
2 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.1 Appliance parameters . . . . . . . . . . . . . . 22
2.1.1 Single appliance Suprapur KBR ... . . . . . 22
2.1.2 Factory-prepared cascade
Suprapur MKB ... . . . . . . . . . . . . . . . . . . 23
2.2 Dimensions and minimum clearances . . 24
2.2.1 Single appliance Suprapur KBR ... . . . . . 24
2.2.2 Factory-prepared 2-boiler
cascade MKB ... . . . . . . . . . . . . . . . . . . . 25
2.3 Installed dimensions . . . . . . . . . . . . . . . 27
2.3.1 Single appliance Suprapur KBR ... . . . . . 27
2.3.2 Factory-prepared cascade MKB ... . . . . . 28
2.4 Pressure drop, water side . . . . . . . . . . . 29
2.5 Boiler efficiency . . . . . . . . . . . . . . . . . . . 30
2.6 Standby loss . . . . . . . . . . . . . . . . . . . . . . 30
2.7 Flue gas temperature . . . . . . . . . . . . . . . 31
2.8 Conversion factor for alternative
system temperatures . . . . . . . . . . . . . . 31
3 Appliance layout . . . . . . . . . . . . . . . . . . . . . . . . 32
4 Product description . . . . . . . . . . . . . . . . . . . . . 33
4.1 Gas condensing boiler with
aluminium heat exchanger . . . . . . . . . . . 33
4.1.1 Types and output . . . . . . . . . . . . . . . . . . 33
4.1.2 Possible applications . . . . . . . . . . . . . . . 33
4.1.3 Benefits in brief . . . . . . . . . . . . . . . . . . . 33
4.1.4 Characteristics and special features . . . 34
4.2 Gas burner . . . . . . . . . . . . . . . . . . . . . . . 34
4.2.1 Burner and burner control unit . . . . . . . . 34
4.2.2 Burner function . . . . . . . . . . . . . . . . . . . . 35
4.3 Delivery method . . . . . . . . . . . . . . . . . . . 35
5 Engineering information and sizing
the heat source . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.1 Operating conditions . . . . . . . . . . . . . . . 36
5.2 Water quality . . . . . . . . . . . . . . . . . . . . . 36
5.3 Important hydraulic system
components . . . . . . . . . . . . . . . . . . . . . . 39
5.3.1 Hydraulics for maximum utilisation
of the condensing effect . . . . . . . . . . . . 39
5.3.2 Underfloor heating system . . . . . . . . . . . 39
5.3.3 Diaphragm expansion vessel . . . . . . . . . 39
5.4 Condensate drainage . . . . . . . . . . . . . . . 41
5.4.1 Condensate drain from the
condensing boiler and the flue . . . . . . . 42
5.4.2 Condensate drain from a
moisture-resistant chimney . . . . . . . . . . 42
6 Regulations and operating conditions . . . . . . . 43
6.1 Extracts from regulations . . . . . . . . . . . . 43
6.2 Fuels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.3 Operating conditions . . . . . . . . . . . . . . . 43
6.4 Combustion air . . . . . . . . . . . . . . . . . . . . 44
6.5 Combustion air supply . . . . . . . . . . . . . . 44
6.6 Siting combustion equipment . . . . . . . . 45
6.7 Sound insulation . . . . . . . . . . . . . . . . . . . 45
6.8 Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . 45
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