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ECS 1M
VARIFAN
RECOMMENDED CONTROL
BACKUP
WARNING AND PRECAUTIONS
Equipment failure, blown fuses and/or tripped breakers
may prove harmful to the content of the building. It is
therefore strongly recommended to install backup
devices and alarm or warning devices (see example fig.
6).
BACKUP THERMOSTAT.
If the Varifan control fails,
then the thermostat will start the dedicated fan at full
speed when the temperature will reach the T15-WD set
value. Therefore, the T15-WD should be accessible for
its adjustment and it should be set at the same
temperature as the alarm, i.e. approximately 5ºF above
the fan relative set point.
BACKUP POWER SOURCE.
The DPDT relay
connects to the source 1 in normal operation but will
switch to the source 2 if source 1 is off. The relay shall
be chosen to support the load connect to it.
ALARM CIRCUIT.
In normal operation, the alarm circuit
of the Varifan Control is a short circuit. But if the Varifan
control is defective or if there is no power applied to it,
then the alarm circuit of the control will be an open
circuit.
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