Varifan ECS-2M, User Manual

Page: 18 / 48

Page 18
ECS 2M
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 fig. 7).
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
adjustment and 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 source 1 in normal operation but will switch to source 2
if source 1 is off. The relay shall be chosen to support the
load connect to it.
ALARM CIRCUIT.
In regular circumstances, 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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