Measurement Guide

18
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Greentherm T9800/9900 SE/SEO/SEi Application Manual
12.2019 | Bosch Thermotechnology Corp.Data subject to change
4.4 Combined Domestic Hot Water and Space Heating with Air Handler
Combined domestic hot water and space heating using air handler is possible with
the Greentherm 9000 models.
1) as required by local code.
(optional)
Local code requirements
may require installation of a
thermostatic mixing valve in
some installations.
See table 9, page 19
for pairing Bosch Air
Handlers with Bosch
Cased Coils
Domestic
Hot
Water
Domestic
Cold
Water
NBT-23 Condensate
Neutralizer 
)
(part# 7 738 005 514)
To drain or pump
Gas
Room
Thermostat
Bosch Hydronic Air Handler
Model AHU50 or AHU70
NOTE:
Piping circuit to Air Handler
should not exceed 60 feet
equivalent length ½" pipe or 120
feet equivalent length ¾" pipe
Hot Water
Return
Hot Water
Supply
Legend
Full-port
ball valve
Thermostatic
mixing valve
Union
Check valve
Hose bib
Potable
expansion
tank
Pressure
relief valve
Circulator with
flow check
Automatic Air
Separator
Applications of combined domestic hot water and space heating in an
open loop confi guration, when combined with recirculation, are not
recommended and desired performance is not guaranteed. These
applications will require special confi gurations to ensure proper interaction
between the different sub-systems (e.g. Air Handler, Mixing valve, etc.).
DISCLAIMER: This drawing is conceptual in nature, not to scale and for reference only. Additional functional, installation, and safety devices may be needed or
required. All work pertaining to the installation shall be in full compliance with all legal requirements, including national and local codes. Best installation practices
should be followed.