This brochure is organized into four main sections. They are: 1) Sequence of Operation, 2) Installation, 3) Control Settings, and 4)
Troubleshooting. The Sequence of Operation section has three sub-sections. We recommend reading Section A: General Operation
of the Sequence of Operation, as this contains important information on the overall operation of the control. Then read the sub-sec-
tions that apply to your installation. For quick installation and setup of the control, refer to the Installation section, DIP Switch Setting
section, followed by the Quick Setup section.
The Control Settings section (starting at DIP Switch Setting) of this brochure, describes the various items that are adjusted and displayed
by the control. The control functions of each adjustable item are described in the Sequence of Operation.
Reference Material: Essay E 003 “Characterized Heating Curve and Reset Ratio”
The 256 uses a Liquid Crystal Display (LCD) as the method of supplying information. You use the LCD in order to set up and monitor the
operation of your system. The 256 has three push buttons (Item,
,
) for selecting, viewing, and adjusting settings. As you program
your control, record your settings in the ADJUST menu table which is found in the second half of this brochure.
Item
The abbreviated name of the selected item will be displayed in the item field of the
display. To view the next available item, press and release the Item button. Once you
have reached the last available item, pressing and releasing the Item button will return
the display to the first item.
Adjust
To make an adjustment to a setting in the control, press and hold simultaneously for
1 second, all 3 buttons. The display will then show the word ADJUST in the top right
corner. Then select the desired item using the Item button. Finally, use the
and / or
button to make the adjustment.
To exit the ADJUST menu, either select the ESC item and press the
or
button, or
leave the adjustment buttons alone for 20 seconds.
When the Item button is pressed and held in the VIEW menu, the display scrolls through all the control adjust items in both access
levels.
Additional information can be gained by observing the status field and pointers of the LCD. The status field will indicate which of the
control’s outputs are currently active. Most symbols in the status field are only visible when the VIEW menu is selected.
Control Settings .................................................pg 16
View Menu ...............................................pg 16
Adjust Menu ............................................pg 16
Testing and Troubleshooting............................pg 18
Error Messages .......................................pg 19
Technical Data ...................................................pg 19
Limited Warranty .............................................. pg 20
User Interface ..................................................... pg 2
Description of Display Elements ....................... pg 3
Sequence of Operation ...................................... pg 4
Section A: General Operation ................ pg 4
Section B: Boiler Reset ......................... pg 5
Installation........................................................... pg 8
DIP Switch Setting .............................................pg 15
Quick Setup ........................................................pg 15
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D - 09/19
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