Installation / Operation Instruction Manual

41
Installation instructions
RTG-K-199/160N/X1 – 6 720 817 984 (2022/06)
4.15 Space heating applications
CAUTION:
▶ 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
Bradford White 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. 35. 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.
Bradford White 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). Figure 34 gives an
example of a combination DHW and space heating application
that is allowable. Use of tankless water heater in a combination
DHW and space heating application will result in the product
warranty being reduced to 3 years.