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Installation instructions
17
Fig. 20
B
Attach the combustion air inlet accessory (8 705
504 154) to the top of the unit (position 3) using the
3 screws and gasket provided, and install air intake
pipe over the accessory. NOTE: The appliance has
the option to mount the combustion air inlet acces-
sory 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.
Fig. 21
B
Ensure that exhaust vent pipe is fully inserted in collar
to enable proper connection.
3.3.5
Condensate drain installation
Note: Do not install condensate drain in areas where it
may freeze.
1. Install condensate drain as close to heater as possi-
ble.
2. Use 3/8" ID high temperature silicone tube to con-
nect to condensate drain port. Do not use copper pip-
ing for any portion of the condensate drain.
3. Form a condensate trap by means of a 3" loop par-
tially filled with water.
4. To increase the tube length, connect to end of the
high temperature silicone tubing with vinyl tubing, PVC
or CPVC pipe. Do not reduce the internal diameter at
any point.
5. Dispose of condensate according to local codes.
Fig. 22 Condensate drain installation (combustion air
piping not shown)
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 are additional measures designed to fur-
ther limit backdraft in extreme conditions assuming all
other possible causes have been addressed.
i
Exhaust venting must be 3" or 4" sealed
single wall stainless steel (AL29-4C) vent
pipe.
3" Venting
Z-flex
ProTech
Heat Fab
90°
Condensate
Drain Tee
2SVEVWCF03
FST3 &
FSDF3
93PPLSTEE
Horizontal
Condensate
Drain
2SVEDWCF03
FSHDT3
9321
Condensate
Drain Tube
2SVEDTK24
N/A
7000TUBE
Table 18 Approved Condensate Drain Part Numbers
RAIN CAP
STORM COLLAR
FLASHING
4" MIN.
AIR SPACE
CONDENSATE
APPLIANCE
6720608782-04.2Av
ELBOW
FIRESTOP SUPPORT
DRAIN TRAP
TO DRAIN - DISPOSE
OF CONDENSATE
ACCORDING TO
LOCAL CODES
DRAIN TEE
2' MIN.
10' MIN.
3' MIN.