Specification
6 720 645 817
(2010/09)
25
2.2.2
Factory-prepared 2-boiler cascade MKB ...
Fig. 11 Factory-prepared 2-boiler cascade
AA
Flue gas connection
AL
Combustion air pipe connection (balanced flue operation only)
GAS
Gas connection
RK
Boiler return
VK
Boiler flow
1)
Pump installation point, boiler circuit
6 720 643 417-13.1O
717
1)
T
G
T
Z
615
1143
1018
Y
AA
Ø
AA
1)
Y
RK
Y
VK
215
500
O
M
B
G
B
K
S
N
K
X
AA
X
GAS,
X
AL
AL
GAS
VK
RK
U
1517
R
1)