Specifications

6 720 644 063
Installation instructions
11
3 Installation instructions
3.1 Specialized tools
The following specialized tools may be required for
installation:
• Manometer
• Multimeter
• Combustion Gas Analyzer.
3.2 Introduction
Please follow these instructions. Failure to follow
instructions may result in:
B Damage or injury.
B Improper operation.
B Loss of warranty.
3.3 Venting (660 EF only)
3.3.1 Vent piping
• Bosch Vent System is suggested for the vent system.
If Bosch Vent is not used, a UL listed category III
ventsystem must be used
• Follow the vent pipe manufacturer's installation
instructions.
• Make the vertical section of the exhaust ventas short
as possible
• Maintain the same vent pipe diameter from the heater
flue to the vent termination.
Clearances
Clearances vary by manufacturer, refer to the UL
approved clearances when using materials other than
Bosch Vent System.
• The first vertical run from the top of the heater should
be no longer than 0.9m (3')
• Make sure vent pipe is gas tight and will not leak. Use
silicon sealant wherever necessary
• Do not common vent or connect more than one appli-
ance to this venting system
• The total vent length including horizontal & vertical-
vent runs should be no less than 3' (0.9m).
• Do not store hazardous or flammable substances
near the vent termination and check that the termina-
tion is not blocked in any way
• Steam or condensed water may come out from the
vent termination. Select the location for the termina-
tion so as to prevent injury or property damage
• If snow is expected to accumulate, take care the end
of the pipe is not covered with snow or hit by falling
lumps of snow
• Consult the vent pipe manufacturer's installation
instructions for chimney connections.
Appliance Adapters
When using a vent system other than Bosch Vent, an
appliance adapter will be required to properly connect
the vent to this appliance. Consult the manufacturer's
instructions for the proper appliance adapter.
Warning: The water heater must be
installed by a qualified installer in
accordance with these instructions. If
improperly installed, a hazardous condition
such as explosion or carbon monoxide
poisoning could result. Bosch
Thermotechnology Corp. is not
responsible for improperly installed
appliances.
Warning:
CARBON MONOXIDE POISONING!
Follow all vent system requirements in ac-
cordance with relevant local or state regu-
lation,or, in the absence of local or state
code, in the U.S. to the National Fuel Gas
Code ANSIZ233.1/NFPA 54 – latest edi-
tion, and in Canada, in accordance with
NSCNGPI.
660 EF
Pipe diameter 3’’ (75mm)
Table 1
No. of elbows Max. Straight Vent Length
1)
1) Not including the termination.
3 15' (4.5m)
2 25' (7.5m)
1 35' (10.6m)
Table 2
Manufacturer
and Product
Enclosed Unenclosed
Hort. Vert. Hort. Vert.
Bosch Vent
System
10" (250mm) (sides)
15" (375mm) (top)
6" (150mm) (bottom)
4"
(100mm)
1"
(25mm)
1"
(25mm)
Table 3