Bosch KBR42-3A - Maintenance

Common applications of KBR boilers
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
30
5.2 Multiple zones using circulators with DHW
Fig. 13 Piping
[1] Supply to heating zone 2
[2] Pump heating zone 2
[3] Supply to heating zone 1
[4] Pump heating zone 1
[5] Supply to indirect tank
[6] DHW pump
[7] Drain/Bleed point
[8] Boiler supply pipe 1¼ "
[9] Low Loss Header
[10] Heat only boiler
[11] Boiler return pipe 1¼ "
[12] Return from indirect tank
[13] Return from heating zone 1
[14] Return from heating zone 2
[15] Grain/Bleed point x3
[16] Combination fast fill/back flow preventer
[17] Expansion (tank) vessel
5.2.1 To utilize the LLH
▶ Switch off and isolate the boiler
▶ Drain the boiler
▶ Remove front panel
▶ Locate the LLH at the left-hand side of the lower section of the boiler
1. Unscrew the cap [a] from the body of the LLH [c]
– This will break the label across the cap and body indicating that
the LLH has been employed
2. Withdraw the cap [a] and plunger assembly [b]
3. Unscrew the plunger assembly [b] from the cap [a],
4. Set the plunger assembly [b] aside
5. Re-fit the cap [a] without the plunger assembly [b]
6. Tighten the cap [a] and ensure it is secure.
Fig. 14 Utilizing the LLH
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1 3 5
12 13 14
11
8
17
9
10
2 4 6
15
16
7
c
a
b
2.
4.
1.
5.
6.
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3.