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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© 2019 tekmar 256_D - 09/19
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Item
How to Use the Data Brochure
Table of Contents
User Interface
