Bosch C 1210 ES Installation Manual page 18

Installation instructions
The condensate must be disposed of in
i
accordance with local codes.
See chapter 3.11 "Filling the condensate
trap".
Use materials approved by the authority
i
having jurisdiction. In the absence of other
authority, PVC, and CPVC pipe must
comply with ASTM D1785, F441 or
D2665. 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 2.
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 codes.
Leave min. ¼" air gap
1 ½" x ¾" PVC Reducer
Trap required
Fig. 18 Appliance drain installation
External condensate drain installation
If an external condensate drain (installer supplied) must
be installed (Section
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.
18
3.3.2), the following
• 3. To install condensate drain in vent system, use
PVC 3" X 3" X 1.5" tee and reduce for drain
connection.
Fig. 19 External condensate drain installation
3.3.6 Freeze prevention
In cold climates, components of a tankless water heater
can freeze and burst from negative draft. A leading
cause of negative draft is combustion appliances in the
building not being supplied with sufficient combustion
air. A wood stove or furnace can pull its combustion air
from the water heater's vent pipe, allowing the cold
incoming air to freeze the cold water in the heat
exchanger. Supplying more combustion air for all com-
bustion appliances is the solution. A HVAC specialist
should be consulted to design solutions for providing
more combustion air.
Listed below is an additional measure designed to fur-
ther limit backdraft in extreme conditions assuming all
other possible causes have been addressed.
is
4" Min.
Condensate drain
Dispose of condensate in
accordance with local codes
6720608643-17.2V
6 720 644 887