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Bosch C 950 Installation Manual page 19

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▶ Attach the combustion air inlet accessory to the top of the unit fig. 19
(position 2) using the 3 screws and gasket provided, and install 3" air
intake pipe over the accessory.
Fig. 19 Inlet connection
NOTE: The combustion air accessory can be installed on
the top right or on the top left side of the heater. The
combustion air inlet that is not used must be kept sealed.
Connecting the condensate water drain
NOTICE: Risk of appliance freezing!
▶ Failure to properly install condensate drain can
damage the appliance and will void the warranty.
NOTICE: Risk of appliance freezing!
▶ Do not install condensate drain tubing in areas where
it may freeze.
The condensate must be disposed of in accordance with
local codes.
See chapter 4.11 "Filling the condensate trap".
Use materials approved by the authority having
jurisdiction. In the absence of other authority, PVC, and
CPVC pipe must comply with ASTM D1785, F441
orD2665. Cement and primer must comply with ASTM
D2564 or F493. For Canada, use CSA or ULC certified
PVC or CPVC pipe, fittings and cement, see table 5.
PP pipe must be certified under ULC S636.
Appliance condensate drain installation
The appliance comes equipped with an internal condensate drain and
siphon. This drains condensation formed in the secondary heat
exchanger. Piping must be installed under the condensate drain outlet
on the water heater and piped for disposal in accordance with local
Fig. 20 Appliance drain installation
Leave minimum ¼ " air gap
Trap required
1 ½ " x ½ " PVC reducer
External condensate drain installation
If an external condensate drain (installer supplied) must be installed
(chapter 4.3.2), the following is recommended:
• 1. Install condensate drain on a horizontal section of the exhaust pipe
as close to the heater as possible.
• 2. The condensate must be disposed of according to local codes.
• 3. To install condensate drain in vent system, use PVC 3" X 3" X 1.5"
tee (part# 196278) and reduce for drain connection
Fig. 21 External condensate drain installation
Condensate drain
Dispose of condensate in accordance with local codes
[LA] Minimum 4"
Installation instructions | 19
6 720 805 440 (2014/11)



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