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All of the following parameters are controlled by either a storage tank temperature sensor or the inlet tempera-
ture sensor:
• Setpoint = Target Temperature (120°F) Low re only above this point
• Offset = Off Setpoint (3) = 123°F off
• Hysterisis = On Setpoint (8) (120 + 3 - 8 = 115°F)
• Bandwidth = Modulation range (4) (120 - 4 = 116°F, modulation begins)
The heater turns on at 115°F and when the temperature reaches 116°F the ame will begin to modulate down
(approximately 25% of the modulation range per degree F of increase in this example) at 120°F, it will be at low
re and will remain there unless the temperature drops below 120°F and it will modulate back up. If it continues
to increase, it will shut down at 123°F.
Outlet sensor
Its purpose is twofold: rst stage high limit and second as a sensor for computing ∆T. Default water heater set-
tings are as follows:
• Setpoint = start of modulation (185°F)
• Offset = Off Setpoint (5°F) (185 + 5 = 190°F off)
• There is a xed Manual Reset High Limit at 195°F on water heaters, and 225°F on heating boilers.
MAINTENANCE
H. WATER HEATER OPERATING SAMPLE
Page 37 of 50
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