AERCO Esteem Boiler with EZ-Set Controller - Manual (Page 138)

GF-135 Esteem 399 Low NOx Boiler
Chapter 18
OMM-0089_0A Installation, Operation & Maintenance Manual Controller Operation
Figure 18-30: DHW STORAGE SETPOINT Menu
DHW Storage Setpoint is the domestic hot water storage setpoint temperature when the Sensor
option is chosen in DHW Demand. Press the LEFT or RIGHT buttons to adjust the DHW Storage
Setpoint then press the OK button to store the setting.
NOTE
The boiler setpoint is automatically set to the DHW Storage
Setpoint + DHW Storage Adder when the Sensor option is chosen
in DHW demand.
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18.4.5 DHW on Differential (Default: 6°F [3°C])
Figure 18-31: DHW ON DIFFERENTIAL Menu
DHW On Differential sets how far the DHW storage temperature must fall below the DHW
Storage Setpoint to create a domestic hot water call when the Sensor option is chosen in DHW
Demand. The domestic hot water call will end when the DHW storage temperature rises above
the DHW Storage Setpoint. Press the LEFT or RIGHT buttons to adjust the DHW On Differential
then press the OK button to store the setting.
WARNING!
The DHW on differential setting greatly affects the production of domestic
hot water. A low setting could result in a rapid response to a domestic hot
water call resulting in a potential scald hazard. It is strongly
recommended that the installer utilize a thermostatic mixing valve on the
hot water outlet of the indirect water heater. Failure to comply could result
in severe personal injury, death, or substantial property damage.
Page 138 of 188 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0089_0A
MC1 06/19/14 Ph.: 800-526-0288