Installation instructions
3.9Water connections
Warning: This heater is not approved for preheated water applications.
See chapter 3.11 for approved recirculating application.
Warning:
In applications where inlet water temperature can exceed 140°F (60ºC), a
BWhen facing the heater, the ¾” cold connection is on the bottom right and the hot connection is on the bot- tom left. Centrally locating the water heater is recom- mended to keep hot water distribution times even throughout the structure.
COLD
HOT
Fig. 30
BThe use of unions when connecting both water pipes to the inlet and outlet connections is required. This will facilitate any necessary servicing.
BPlastic or PEX type plumbing line materials are not suitable for connecting directly to the water heater.
BAlthough water piping throughout the building may be other than copper, we recommend that copper or suitably rated stainless steel flex line piping be used for the water connections for 1.5’ on either side of the water heater (follow local codes if more stringent).
BNever sweat any piping directly to or beneath the water connections, as damage can occur to the internal water valve from heating of the pipe.
BKeep water inlet and outlet pipes to no less than ¾" (19.05mm) diameter to allow the full flow capacity.
BIf the cold and hot connections to the heater are reversed, the heater will not function. Be certain there are no loose particles or dirt in the piping. Blow out
or flush the lines before connecting to the water heater.
BFull port shutoff valves should be installed on both the cold water supply and hot water outlet lines to facilitate servicing the heater (see Fig. 31).
BFor installation on a private well system with the use of a pressure tank, the lowest pressure range setting recommended is
3.10 Water quality
Water quality can have an impact on appliance longevity and may not be covered under the manufacturer's warranty.
For water analysis data call your local water department, or if on a well, have well water analyzed periodically. If water quality exceeds one or more of the values specified below, Bosch recommends consulting a local water treatment professional for water softening/ conditioning options.
Description | Max. Levels | ||
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pH | pH | 6.5 - 8.5 | |
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TDS (total Dissolved | mg/l or ppm | 500 | |
Solids) | |||
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Total hardness | mg/l or ppm | 100 | |
(6 grains) | |||
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Aluminum | mg/l or ppm | 2.0 | |
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Chlorides | mg/l or ppm | 250 | |
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Copper | mg/l or ppm | 1.0 | |
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Iron | mg/l or ppm | 0.3 | |
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Manganese | mg/l or ppm | 0.05 | |
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Zinc | mg/l or ppm | 5.0 | |
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Table 13 |
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6 720 608 542 | 25 |