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Installation instructions
39
Greentherm T9800 SE 160/199 – 6 720 816 815 (2022/01)
4.11 Domestic hot water recirculation with
external pump
The following drawing is provided to illustrate one possible
recirculation design. This 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.
This appliance has been designed to activate recirculation by
controlling an external pump. For this function, the external
pump must be powered by an external electrical source and can
be switched on and off using the Bosch cable accessory
(7736504585). All the features of recirculation ( 6.5.2, A1
Recirculation) can be used.
Fig. 30 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] Greentherm T9800 SE
[7] PRV
[8] Shutoff valves, field supplied
Fig. 31 Recirculation application using the cold water line
and a cross-over valve
[1] Cold water supply
[2] Check valve, field supplied
[3] Expansion tank, field supplied
[4] Circulator pump, field supplied
[5] Circulator cable accessory
[6] Greentherm T9800 SE / SEC
[7] PRV
[8] Shutoff valves, field supplied
[9] Cross-over valve, field supplied
Recirculation application showed in fig. 31 is for Greentherm
T9800 SE model only.
Models with a built-in pump cannot be used.
For recirculation applications using a cross over or by pass
valves, both Aquamotion AMK-ODR and Grundfos thermal
bypass valves can be used. One or two valve may be required
depending on the system requirements (refer to pressure drop
curves of the water heater and accounting for piping pressure
loss) and pump sizing. A minimum of 1.3 GPM is recommended
to provide adequate flow through the water heater.
4.11.1 Recirculation options
House Recirculation
This recirculation option uses the appliance's NTC sensor along
with the option to schedule and control the pump (only with
remote control - part numbers 7736504946 and
7736504945).
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