Bosch 940 ES Installation And Operating Instructions Manual page 27

4.3.4 Vent connections
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. 20 (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.
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. 20 Exhaust connection
▶ Attach the combustion air inlet accessory to the top of the
unit fig. 21 (position 2) using the 3 screws and gasket
provided, and install 3" air intake pipe over the accessory.
940 ES – 6 720 644 930 (2019/09)
Fig. 21 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.
4.3.5 Connecting the external 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.
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 fig. 5.
Installation instructions
27