x Enable status / operating mode is irrelevant
(1)… (1) In this case AUTO means that the heating circuit will be controlled to the
T.flow max. setting specified in the Heat curve menu.
(2) OFF does not apply if If heating circ. pump = off => Mixer: is set to Control
in the shutdown conditions.
EXTERNAL SWITCH
If a digital signal (ON/OFF) is connected to the External switch input variable, it is possible to
switch between standby/frost protection mode and the current operating mode of a lower-priority
operating level. If the input signal is set to ON, the controller switches to Standby or, if the frost
protection conditions are met, to Frost protection. If the signal is set to OFF, the controller switches
to the currently applicable operating level.
The input variable also accepts analogue values for external operating mode changeover:
Value (dimensionless): Operating mode:
64 Standby/frost protection
65 Time/auto (operating mode as per Time condition status)
66 Standard
67 Setback
127 Return to the mode applicable in the current operating level.
0 Does not cause a change in the operating mode, but a change may be
caused subsequently by a lower-priority operating level.
These analogue values can come from another function, or via the GSM module of the C.M.I. as a
network input. The values from the external switch have priority 2 (see Table 2 in the OPERATION
chapter).
N.B.: If, during the time when the value is between 64 and 67, an attempt is made to set a different
operating mode in an operating level with lower priority (= Calendar, External set room temperature,
RAS and Internal), the controller will remember that change and will apply that operating mode if
control is returned with a value of 127 from the External switch.
Important note: The external switch must never be linked to a temperature sensor, as doing so
could cause damage to the controller.