Bosch GWH 715 ES Installation Instructions Manual page 16

Installation instructions
Company Contact info
Z-flex www.z-flex.com
800-654-5600
ProTech Industries www.protechinfo.com
800-766-3473
Heat-Fab www.heatfab.com
800-772-0739
Table 6 Vent manufacturers
Minimum exhaust vent size and length
The minimum exhaust vent length is
3 feet (1 m) with one 90 degree
elbow.
Fig. 18
Maximum exhaust vent and combustion air inlet
lengths
Fig. 19 Maximum vent and combustion air lenghts
Note: reduce 2.5 ft for each 90° elbow used after the
first one, reduce 1.25 ft for each 45° elbow, see table 3,
page 15.
Refer to chapter 3.11.3
requirements.
Note:
i
Maximum combination length for separate
tubes:
• 52 ft + two 90° elbows + two terminals.
Vent Safety System
The GWH 715 ES will shut down if inadequate exhaust
venting is detected or a lack of combustion air is
provided to the unit; see troubleshooting section on
16
for condensate drain
page 35. See error code to confirm error, correct the
problem and then reset the heater before operating.
3.11.2 Vent connections
B Attach the flue gas exhaust accessory (8 705 504
151) to the top of the unit (position 1) using the 4
screws and gasket provided. Fully insert stainless
steel vent pipe 1.5" minimum into the accessory and
tighten the clamp (position 2).
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.
Exhaust venting must be 3" or 4" sealed
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single wall stainless steel (AL29-4C) vent
pipe.
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