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23
6.18.2 I
NSTALLATION CONTAINING TWO
S-
CB
+
400/550
CH
BOILERS USING
NON-RETURN
VALVES
valve
siphon
low loss
header
air separator
pump
dirt separator
automatic air vent
strainer (water filter)
expansion vessel
pressure relief valve
non-return valve -
use low resistance type:
S-CB
+
400/550
TOP VIEW
S-CB
+
400/550
TOP VIEW
EXTERNAL
SYSTEM
PUMP (P3)
HEATING ZONE
NRV
NRV