TAC 2112 - Page 35

TAC 2112, Manual Functional Description
TAC AB, 1999-08-01 0-004-7459-3 (GB), 7:3(
22
)
Manual control
When the controller is in the “manual control” operating mode, the
following takes place:
•
The symbol on the left is displayed in the display window.
•
All relay outputs except for
Open heating valve
and
Close heating
valve
are activated (the contacts are closed).
•
The analogue outputs remain at the same levels.
•
The outputs can be controlled manually from the operator’s panel.
Changing the operating mode
The operating mode of the controller can be changed by means of the
following functions:
•
The operator’s panel, by changing parameter P 00.
•
The input for forced night setback (X2).
•
The input for extended daytime operation (X1).
•
The holiday periods in the yearly program.
Priorities
The operating mode can be changed only by a function which has the
same or a higher priority than the function which is the reason for the
current operating mode. The priorities of the functions are as follows
(1 is the highest priority):
1 Operating modes chosen by use of the operator’s panel
2 Input for extended daytime operation
3 Yearly program under timed operation
4 Input for forced night setback
5 Weekly program under timed operation
For example: The yearly program cannot affect control if the input for
extended daytime operation is on.