GE GEH50DEED Technical Service Manual page 15

High Demand Mode
T2 is less than set
temperature minus 20F
(T2< ST-20F)
Upper Element on until
T2 reaches set
temperature minus 7F
(T2 = ST-7F)
Medium flow
event active
Yes
Lower Element on
until T2 reaches set
temperature
Water temperature 5°F less than set point? Use Sealed system.
Water temperature 1°F less than set point. Small amount of water has been used (less than 10 gallons)? Use
sealed system.
Medium amount of water has been used (10 to 20 gallons)? Use lower element.
Water temperature 20°F less than set point? Use upper element until 7°F less than set point, then: lower
element if medium flow during upper element on time, Sealed system is no water flow during upper element
on time.
Control checks T2
(tank sensor)
T2
less than set
temperature
T2 is less than set
temperature minus 5F
(T2< ST-5F)
No
Run sealed system
until T2 reaches set
temperature
Has there
been a flow
event?
Small flow of less
than 10 gallons and
T2 < ST-1F
– 15 –
Medium flow of
10-20 gallons
Lower Element on
until T2 reaches set
temperature
(Continued Next page)