State Water Heaters 100 Series Instruction Manual page 11

differential settings
Adjustable user setting(s) 1°F (0.6°C) to 20°F (11.0°C) range; factory default
is 2°F (1.1°C). The water heaters covered in this Instruction Manual will
have 3, 6 or 9 heating elements. Each group of 3 heating elements is one
"Bank" of heating elements. Heating elements are energized in Banks of 3.
Each Bank of heating elements will have a Differential Setting associated
with it. Differential Settings are located in the Temperatures Menu.
There is a 1st Differential Setting on all models. There will be one
additional Differential Setting visible/adjustable for each additional
Bank of (3) heating elements.
operating sequence
With an Operating Set Point of 120°F (48.9°C) and all Differential
settings at 2°F (1.1°C) the On/Off sequencing of heating element
Banks would be as follows:
DIFFERENTIAL
BANK NUMBER
SETTING
Bank 1 2°F (1.1°C)
Bank 2 2°F (1.1°C)
Bank 3 2°F (1.1°C)
From the Desktop Screen, press the Operational Button underneath "MENU"
to enter the Main Menu.
Notice how the text above the Operational Buttons on the display changes
as you navigate through the various menus and screens.
With Temperatures selected (highlight in black) in the Main Menu, press the
Operational Button underneath "SELECT" to enter the Temperatures Menu.
If Temperatures is not selected use the Up and Down buttons to select this
menu item.
With the Operating Set Point selected in the Temperatures Menu, press
the Operational Button underneath "CHANGE" to activate the adjustment
mode for this menu item.
Press the Up and Down buttons to adjust the Operating Set Point to the
desired setting.
Press the Operational Button underneath "UPDATE" to confirm the new
setting. Press the Operational Button underneath "CANCEL" to discard the
new setting and retain the previous setting.
The new Operating Set Point value should now be displayed as the current
value.
NOTE: Use this same procedure to adjust the Differential settings and the
Tank Probe Offset in the Temperatures Menu.
This same procedure is used to change user settings in other control system
menus.
TURN ON TEMP TURN OFF TEMP
118°F (47.8°C) 120°F (48.9°C)
116°F (46.7°C) 118°F (47.8°C)
114°F (45.6°C) 116°F (46.7°C)
actIon
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 (-2.8°C) to +5°F (2.8°C) range; factory
default is 0°F (0°C). If the current Tank Temperature is sensed (from
the immersion Temperature Probe) at 120°F (48.9°C) and the offset is
adjusted to -5°F (-2.8°C) the control system would calibrate or "offset"
the Tank Temperature to 115°F (46.1°C). 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.
teMperature settInGs
The Operating Set Point and the Differential Settings are adjusted
in the Temperatures Menu. The following instructions explain how to
adjust these user settings and navigate the control system menus.
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dIsplay