Bosch GWH C 920 ES - Advanced Tank Loading Commercial Hot Water System

Bosch applications manual | 06.2009BOSCH THERMOTECHNOLOGY CORPORATION
Bosch applications manual
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11.3 Advanced tank loading commercial hot water
system
The following application outlines an advanced tank loading
application for commercial hot water systems (e.g. hotels, fi tness
centers). This design allows for complete isolation of the system for
maintenance reasons and gives the ability to bypass certain system
components in case of failure. A second hot water storage tank is
shown for additional hot water supply and back up in case of tank
failure.
System parameters:
See Chapter 5.1 and 5.2 for pump parameters
Note:
Drawing is not to scale.
Symbols
cold supply
Bosch GWH 715 ES, Bosch GWH C 800 ES, or Bosch GWH C 920 ES/ESC
cold
hot
cold
hot
cold
hot
cold
hot
Service
valves
Pressure
relief
valve
Tankless
link
Flow
direction
Thermostatic
mixing
valve
Circulator
DHW
Aquastat / Water Heater setpoints
Model Number Aquastat setpoint Water heater
setpoint
GWH C 920 ESC ≤140°F 14°F above
Aquastat setpoint
GWH C 920 ES ≤126°F* 140°F
GWH 715 ES ≤126°F* 140°F
GWH C 800 ES ≤126°F* 140°F
* If local codes require higher setpoint or to increase the recovery
capacity of the water heater, contact Bosch Thermotechnology.