Old Operating Modes - Theben FCA 2 Manual

Fan Coil Actuator FCA 2

6.7.2 Old operating modes

If Old... is selected in the "Determination of operating mode" parameter on the "Operating mode"
parameter page, the current operating mode can be defined as follows:
Table 63
Night Comfort
Object 21 Object 22
any any
any 1
Standby 0
Night 0
Typical application: In the mornings, "standby" mode, and in the evenings "night" mode are
activated by a time switch via object 21.
In holiday periods, frost/heat protection is selected via another channel of the time switch via
Object 23.
Object 22 (comfort) is connected to a presence detector. If presence is detected, FCA 2 switches
to comfort operating mode (see table).
Object 23 is linked with a window contact: As soon as a window is opened, FCA 2 switches to
frost protection mode.
Standby
0 Night
object
1
Night
Comfort
Frost
protection
Figure 13
The old method has 2 disadvantages over the new method:
1. To switch from Comfort to Night operating mode, 2 telegrams (2 time switch channels if
necessary) are required: Object 4 must be set to "0" and Object 3 to "1".
2. If the window is opened and then closed again during periods when "Frost/heat
protection" is selected via the time switch, the "Frost/heat protection" mode is cleared.
Updated: Feb-16 (subject to changes)
Frost/heat protection object 23 current operating mode
1
0
0
0
0 Comfort object
1
Object 24
Frost/heat protection
Comfort
Standby
Night
0 Frost
object
Operating
1
Current
mode
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