Bosch KBR42-3A - 5 Common Applications of KBR Boilers; Multiple Zones Using Zone Valves with DHW; Utilizing the LLH

Common applications of KBR boilers
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
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5 Common applications of KBR boilers
5.1 Multiple zones using zone valves with DHW
Fig. 10 Piping
[1] Supply to heating zone 2
[2] Motorized valve heating zone 2
[3] Supply to heating zone 1
[4] Motorized valve heating zone 1
[5] System pump
[6] DHW pump
[7] Supply to indirect tank
[8] Drain/Bleed point
[9] Boiler supply pipe 1¼ "
[10] Low Loss Header
[11] Heat only boiler
[12] Boiler return pipe 1¼ "
[13] Return from indirect tank
[14] Return from heating zone 1
[15] Return from heating zone 2
[16] Drain/Bleed point
[17] Combination fast fill/back flow preventer
[18] Expansion (tank) vessel
5.1.1 Utilizing 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. 11 Utilizing the LLH
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MM
1 3 7
2
4
6
5
18
9
17
8
12
13 14 15
11
10
16
c
a
b
2.
4.
1.
5.
6.
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3.