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Greentherm T9800 SE(C) 160/199 Application Manual
06.2017 | Bosch Thermotechnology Corp.Data subject to change
4.2 Pump sizing for circulation
The following section outlines pump sizing for domestic hot water recirculation and
tank loading. Only models approved for such applications are listed in this section.
Pump must be bronze or stainless steel and designed for potable water
systems.
Size the pump according to the pressure drop curve of your Greentherm
model (fig. 1 below) and the loop pressure drop tables.
Maximum flow allowed for tank loading through the pump loop is 5 GPM.
Must be 0.45 gpm to activate unit
DHW recirc loop pump must circulate enough gpm to account for normal
loop heat loss and to ensure that the recirc pump eventually satisfies and
turns off
Pressure drop curve
Figure 2
For direct DHW recirculation and tank loading
applications:
Run the system for 30 minutes to remove debris
from the plumbing. Then remove the unit‘s inlet water fi lter to
decrease pressure drop through the system. If the inlet water fi lter,
when removed, contains debris, it is recommended to install a 40
mesh Y-strainer (installer supplied) on the cold water inlet.
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