Bosch C 950 Installation And Operation Instruction Manual page 27

Fig. 16 Horizontal parallel venting system (twin pipe direct
vent)
[A] 3 ft minimum
Fig. 17 Horizontal venting system (single pipe penetration)
[1] Exhaust pipe
[2] Intake pipe
[LA] Minimum 4"
C 950/C 1050 (Pro TL 175 C/199 C) – 6 720 805 440 (2019/10)
NOTICE:
Risk of appliance freezing!
▶ Single pipe penetration should be used in non-freezing
climates only and steps must be taken to ensure that
adequate combustion air is available to the water heater at
all times!
4.3.4 Vent connections for PP, PVC, CPVC, and ABS
systems
Attaching the exhaust and air inlet connection adaptors to
the top of the heater
▶ Attach the flue gas exhaust accessory to the top of the unit
fig. 18 (position 1) using the 4 screws and gasket provided,
and fully insert vent pipe into the accessory. If using 4"
venting, a 3" to 4" increaser should be installed directly
after this accessory. If using 2" venting, a 3" to 2" reducer
should be installed directly after this accessory. If using the
PP twin pipe system, adapters from the appliance adapter
(3" PVC compatible) to the PP system are needed.
NOTE: Vent pipe must be completely vertical when inserting or
blue gasket inside exhaust accessory can become displaced.
Exhaust accessory can be removed with vent pipe attached to
check gasket position.
Fig. 18 Exhaust connection
Installation instructions
27