Bosch 7 736 504 585 User manual

Recirculation Pump Kit 7 736 504 585
16 720 819 502 (2023/09)
Fig. 1

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Recirculation Pump Kit 7 736 504 585
6 720 819 502 (2023/09)
Fig. 2
Fig. 3 Wiring detail
[1] Tankless unit outer cover
[2] External recirculation pump (field supplied)
[3] Line voltage connection to terminal block of accessory
cable
[4] 5 amp fuse
[5] Recirculation pump kit
[6] Accessory cable connects to tankless control board
Black
Red
6720819502-0 . V32
External power supply required to power the
pump.
External power supply and wiring field
supplied.

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Recirculation Pump Kit 7 736 504 585
6 720 819 502 (2023/09)
Domestic hot water recirculation - Indoor 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 two possible
recirculation designs. These schematic is 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.
Start up procedure
▶Open a hot and cold water tap to fill the water circuit.
▶Plug-in and turn ON appliance.
▶Open gas supply to appliance.
▶Wait until there is no air in the recirculation loop (a few
minutes).
▶Close the taps.
The recirculation system is now ready to be activated.
Recirculation options
House Recirculation
This recirculation option uses the appliance's NTC sensor along
with the optional schedule to control the pump.
Tank loading
This recirculation option gives the option of using one of three
temperature sensors to control the recirculation option. The
scheduling option is not available for tank loading, except for
commercial models.
•External NTC
– Only compatible with Bosch cable/sensor accessory
(7736504583).
•Aquastat
– The aquastat connector kit (7736504584) must be used
to connect a field supplied aquastat to the appliance.
•Internal NTC
– Uses the appliance's NTC sensor to measure the
incoming water temperature.
For more information on how to program each menu, see the
appliance installation manual.
In order to reduce the heat loss through the
pipes, it’s recommended to insulate all the
pipes in the recirculation circuit.
WARNING: Appliance damage!
▶Ensure that the water loop is full before
activating the recirculation mode.

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Recirculation Pump Kit 7 736 504 585
6 720 819 502 (2023/09)
Recirculation with a dedicated return line
Fig. 4 Recirculation application with a dedicated return
line
1Cold water supply
2Check valve field supplied
3Circulator pump field supplied
4Expansion tank field supplied
5Circulator cable accessory
6Greentherm 9800 SE / SEC
7PRV
8Shutoff valves field supplied
Recirculation with a cross over valve
Fig. 5 Recirculation application using the cold water line
and a cross over valve
1Cold water supply
2Check valve field supplied
3Expansion tank field supplied
4Circulator pump field supplied
5Circulator cable accessory
6Greentherm 9800 SE / SEC
7PRV
8Shutoff valves field supplied
9Cross over valve field supplied

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Recirculation Pump Kit 7 736 504 585
6 720 819 502 (2023/09)
Selecting the recirculation settings
This section only applies to the Greentherm 9000 indoor
models.
Fig. 6 SA - Settings
This menu provides access to several parameters.
▶Touch the symbol to enter the menus.
▶Touch the symbol until the display shows SA Settings.
▶Touch the symbol .
▶Use the symbols or to scroll through the
information/adjustments menus, until A1 Recirculation
appears in the display.
▶Touch the symbol to select A1 Recirculation menu.
A1 Recirculation
Choosing a recirculation program:
▶Use the symbols or to scroll through the options.
–HR House Recirculation
–TL Tank Loading
–OFF Off
HR House Recirculation
Creating a Schedule:
▶Touch the symbol , to select Schedule.
▶Touch the symbol , to enter the programming menu.
Display shows week days.
▶Touch the symbol , to select a week day.
▶Use the symbols or to choose option Add New.
▶Touch the symbol , to enter the recirculation program.
▶Use the symbols or to choose the beginning
hour.
▶Touch the symbol , to set the beginning hour.
▶Use the symbols to choose the end hour.
▶Touch the symbol , to set the ending hour.
A recirculation period is defined.
The user can add additional recirculation periods on the
same day.
▶Touch the symbol , to select Add New and repeat all
steps mentioned above.
Copying recirculation program,
The user can copy the recirculation period(s) to other days of
the week.
▶Use the symbols or to select the day of the week
to be copied.
▶Use the symbols or to choose option Copy to.
▶Touch the symbol .
Display shows week days.
▶Touch the symbol to select the day of the week.
▶Use the symbols or to choose another week day.
When week days are selected,
▶Touch the symbol to validate operation.
▶Touch the symbol to exit.
Deleting a recirculation program,
▶Use the symbols or to select the day of the week
to be deleted.
▶Touch the symbol .
▶Use the symbols or to choose option Delete.
▶Touch the symbol .
▶Use the symbols or to choose a recirculation
period.
▶Touch the symbol twice to delete recirculation period.
▶Touch the symbol to exit.
AA Always Active
The recirculation logic will only use the internal NTC to control
the recirculation pump.
▶Touch the symbol to select ON.
Recirculation will be always active.
TL Tank Loading
▶Touch the symbol .
Display shows following menu.
–External NTC
–Internal NTC
–Aquastat
Select the menu according with the installation.
It is recommended to set a schedule that
matches use pattern to save energy and
improve performance.

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Recirculation Pump Kit 7 736 504 585
6 720 819 502 (2023/09)
OFF
Set the OFF:
▶Touch the symbol , to select OFF.
Recirculation will not be active.

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Recirculation Pump Kit 7 736 504 585
6 720 819 502 (2023/09)
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
1Cold water supply
2Check valve field supplied
3Circulator pump field supplied
4Expansion tank field supplied
5Circulator cable accessory
6PRV
7Shutoff valves field supplied
8Greentherm T9800 SEO / SECO
Fig. 8 Recirculation application using the cold water line
and cross-over valve
1Cold water supply
2Check valve field supplied
3Circulator pump field supplied
4Expansion tank field supplied
5Circulator cable accessory
6PRV
7Shutoff valves field supplied
8Greentherm T9800 SEO / SECO
9Cross-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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Recirculation Pump Kit 7 736 504 585
6 720 819 502 (2023/09)
Recirculation options
House Recirculation
This recirculation option uses the appliance's NTC sensor along
with the optional schedule to control the pump (only with
remote control).
Tank loading
This recirculation option gives the option of using one of three
temperature sensors to control the recirculation option. The
scheduling option is not available for tank loading, except for
commercial models and with Bosch remote control.
•External NTC - 7 736 504 583
– Only compatible with Bosch cable/sensor accessory
(7736504583).
•Aquastat - 7 736 504 584
– The aquastat connector kit (7736504584) must be
used to connect a field supplied aquastat to the
appliance.
•Internal NTC
– Uses the appliance's NTC sensor to measure the
incoming water temperature.
SA (Settings)
This section only applies to the Greentherm T9800 outdoor
models.
Fig. 9 SA - Settings
This menu provide access to several parameters.
▶Access to information / adjustments menu.
Display shows P4 (Information).
▶Press the button until the display shows SA
(Settings).
▶Press the button .
Display shows E.
▶Press buttons or to choose the following
information.
–E Exit
–A1 Recirculation
–A8 Startup Delay
–A9 Units Set
–Ab Region Selection
–rS Recirculation Settings
▶Press the button to select the desired information.
A1 Recirculation
Choosing a recirculation program:
▶Press the button .
▶Press buttons or to scroll through the options.
–OF OFF
–rE House Recirculation
–tI Tank Loading Internal NTC
–tE Tank Loading External NTC
–tA Tank Loading Aquastat
▶Press the button to exit recirculation menu.
RS Recirculation Settings
To define recirculation comfort level,
▶Press the button .
▶Press buttons or to define comfort level.
–1
–2
–...
–9
Choosing a higher comfort level (9) will set the
recirculation water temperature closer to the set point
defined on the water heater. Choosing a lower value (1) will
favor efficiency at the expense of recirculation temperature
comfort.
▶Press the button to select value and to exit
Recirculation Settings.

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Recirculation Pump Kit 7 736 504 585
6 720 819 502 (2023/09)
Recirculation de l'eau chaude sanitaire - modèles d'intérieur
La recirculation directe à travers le chauffe-eau est permise,
cependant, la garantie de l'échangeur de chaleur est réduite;
Voir la garantie sur www.boschheatingandcooling.com.
Les dessins suivants sont fournis pour illustrer deux possibili-
tés de recirculation. Ces schémas sont uniquement à titre
d'illustration et ne doivent pas être utilisés pour une installation
réelle sans conseils techniques fournis par un professionnel
dans la localité où l'installation est faite.
Procédure de démarrage
▶Ouvrez un robinet d'eau chaude et froide pour remplir le
circuit d'eau.
▶Allumer l'appareil.
▶Ouvrir la vanne d’alimentation en gaz.
▶Attendre l'absence d'air dans le circuit de recirculation
(quelques minutes).
▶Fermer les robinets d'eau.
Le système de recirculation est opérationnel.
Options de recirculation
Recirculation dans l'habitation
Cette option de recirculation utilise le capteur NTCde l'appareil
ainsi que la programmation facultative pour commander la
pompe.
Chargement du réservoir
Cette option de recirculation permet d'utiliser l'un des trois
capteurs de température pour contrôler l'option de recircula-
tion. L'option de planification n'est pas disponible pour le char-
gement du réservoir, sauf pour les modèles commerciaux.
•Sonde externe
– Compatible uniquement avec le câble / capteur Bosch
(7736504583).
•Aquastat
– Le kit de connecteur aquastat (7736504584) doit être
utilisé pour raccorder un aquastat à l'appareil.
•Sonde interne
– Utilise le capteur NTC de l'appareil pour mesurer la
température de l'eau entrante.
Pour plus d'informations sur la programmation de chaque
menu, voir instruction d’installation et de fonctionnement du
appareil.
Afin de réduire les pertes de chaleur des
tuyaux, il est recommandé d'isoler toutes les
tuyaux du circuit de recirculation.
AVERTISSEMENT : Endommagement de
l'appareil!
▶S'assurer que le circuit d'eau est rempli
avant d'activer le mode de recirculation.

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Recirculation Pump Kit 7 736 504 585
6 720 819 502 (2023/09)
Recirculation avec ligne retour dedicacée
Fig. 10 Application de recirculation avec ligne retour dedi-
cacée
1Alimentation en eau froide
2Clapet anti-retour, fourni sur place
3Pompe du circulateur, fournie sur place
4Vase d’expansion, fourni sur place
5Câble du circulateur, accessoire
6Greentherm 9800 SE / SEC
7SD
8Vannes d’arrêt, fournies sur place
Recirculation avec “cross-over” valve
Fig. 11 Application recirculation avec alimentation eau
froide et vanne cross over
1Alimentation en eau froide
2Clapet anti-retour, fourni sur place
3Vase d’expansion, fourni sur place
4Pompe du circulateur, fournie sur place
5Câble du circulateur, accessoire
6Greentherm 9800 SE / SEC
7SD
8Vannes d’arrêt, fournies sur place
9Cross-over vannes, fournies sur place