TAC AB, 1998-10-23 0-004-7614-0 (GB), 7:1 (24)
TAC 2413 Handbook Functional description
7 Functional description
7.1 Introduction
This chapter contains a description of all the functions of the controller.
At the end of every section is a list of parameters. How parameters are
read and set is described in Chapter 3, “Using the operator’s panel”.
7.2 Operating modes of the controller
The controller normally works in timed operation, that is the weekly
and yearly programs will determine how the AHU is running. During
two speed operation it is controlled toward 1/1 speed or 1/2 speed
operation by these programs. The controller may be changed to other
operating modes, that is manual operation or off, by changing parame-
ter P 00.
Timed operation, one speed operation or 1/2 speed
When the weekly program orders 1/2 speed operation, the 1/2 speed
and clock symbols are shown in the display window.
Timed operation, 1/1 speed
When the weekly program orders 1/1 speed operation, the 1/1 speed
and clock symbols are shown in the display window.
Manual control
If you select 1/1 or 1/2 speed operation, the controller is set to manual
operation automatically. The following symbols are shown in the dis-
play window:
• The hand symbol on the left is shown together with the chosen 1/1
or 1/2 speed symbol.
If the controller is manually controlled from an external contact by
using input X1 or X2, this is shown by the hand symbol, and the 1/1
or 1/2 speed symbol will flash in the display window. It is possible to
obtain manual control by using parameter P 00.
Yearly program
The yearly program is used to stop the AHU during longer periods of
time, such as holidays or school breaks. A total of six holiday periods
may be programmed up to a year in advance.
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