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Installation instructions
Greentherm T9800 SE 160/199 – 6 720 816 815 (2022/01)
40
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 - 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.
4.12 Space heating applications
DANGER:
Risk of scalding!
▶ If the set point temperature is above 120°F (49 °C),
precautions should be taken to protect users of potable
water from scalding.
NOTICE:
▶ The use of a flow switch is recommended to ensure DHW
priority and to prevent “cold-blow” situations when the
Bosch tankless water heater is used with an air handler.
Air handler installation must include a pump.
The flow switch should be used to disable the blower on the
air-handling system when domestic water is used.
NOTICE:
▶ Ensure the primary pump is properly sized to provide
adequate flow for the system heat load.
For external pump sizing please refer to the pressure drop
curves, fig. 33. Also remember to account for system piping
pressure loss. A minimum of 1.7 GPM is recommended to
provide adequate flow through the water heater when
determining the size of the primary pump.
Greentherm T9800 SE tankless water heaters are approved
for use in combination DHW and space heating applications
(open loop setup).
These water heaters are not approved for use in space heating
only applications (closed-loop setup). Bosch supports
applications of combination DHW and space heating in an open
loop configuration if plumbed similar to Fig. 32. Please see
warranty document for additional details.
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