State Water Heaters SSED 120, Instruction Manual

Page: 20 / 36

20
teMperatures Menu
operating set point
User adjustable setting 90°F to 190°F range; factory default is
120°F. When the water temperature sensed by the control system
from the immersion Temperature Probe reaches the Operating Set
Point the control system will end the heating cycle. A call for heat
will be activated again when the water temperature drops below the
Operating Set Point minus the 1st Differential Setting.
Example: Operating Set Point is 120°F, the 1st Differential Setting is
2°F (factory default). A call for heat will be activated when the sensed
water temperature drops to 118°F.
differential settings
Adjustable user setting(s) 1°F to 20° range; factory default is 2°F.
The water heaters covered in this manual will have between 1
and 5 heating elements. There is at least one Differential Setting
on all models. There will be additional Differential Settings for each
additional heating element installed.
operating sequence
On a water heater equipped with 3 heating elements, with an
Operating Set Point of 120°F and all Differential settings at 2°F the
On/Off sequencing of heating elements would be as follows:
taBle 6.
ELEMENT
NUMBER
DIFFERENTIAL
SETTING
TURN ON TEMP TURN OFF TEMP
Element 1 2°F 118°F 120°F
Element 2 2°F 116°F 118°F
Element 3 2°F 114°F 116°F
tank temperature
Non adjustable information display. Current water temperature as
sensed by the control system from the immersion Temperature Probe.
tank probe offset
User adjustable setting -5°F to +5°F range; factory default is 0°F.
If the current Tank Temperature is sensed (from the immersion
Temperature Probe) at 120°F and the offset is adjusted to -5°F the
control system would calibrate or “offset” the Tank Temperature to
115°F. Heating cycles would then start/stop based on the calibrated
Tank Temperature.
Used to calibrate for slight differences in control system temperature
sensing. This can improve the precision of temperature control in the storage
tank and at points of use. This feature can also be used to compensate for
building recirculation loops (hot water returning to the storage tank) that
may cause the heating cycle to terminate prematurely.