Bosch 7 736 504 585 Manual page 7

Recirculation Pump Kit
Domestic hot water recirculation - Outdoor models
Direct recirculation through the tankless water heater is
permissible, however, the heat exchanger warranty is reduced;
see warranty at www.boschheatingandcooling.com.
The following drawings are provided to illustrate possible
recirculation designs. These schematics are for illustration only
and must not be used for actual Installation without
appropriate engineering and technical advice from a properly
licensed professional in the locality where the installation is
made.
This appliance has been designed to permit recirculation by
controlling an external pump. For this function, the external
pump must be electrically connected to the appliance - Bosch
cable accessory is available.
Fig. 7 Recirculation application with a dedicated return
line
1 Cold water supply
2 Check valve field supplied
3 Circulator pump field supplied
4 Expansion tank field supplied
5 Circulator cable accessory
6 PRV
7 Shutoff valves field supplied
8 Greentherm T9800 SEO / SECO
6 720 819 502 (2023/09)
Fig. 8 Recirculation application using the cold water line
and cross-over valve
1 Cold water supply
2 Check valve field supplied
3 Circulator pump field supplied
4 Expansion tank field supplied
5 Circulator cable accessory
6 PRV
7 Shutoff valves field supplied
8 Greentherm T9800 SEO / SECO
9 Cross-over valve, field supplied
Recirculation application showed in fig. 8 is
for Greentherm T9800 SEO/SECO.
Models with build-in pump cannot be used.
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