Manual 2100-695C
Page
38 of 56
Unit Disable Option
The unit is equipped with an input that can be used
with a smoke detector or unit disable switch with a dry
contact. When this input indicates a smoke event, the
system will be shut down. The alarm will automatically
clear when the alarm condition is no longer present.
Inverter Option
The inverter is only used in applications where a
generator is not present and the wall-mount units must
run during a power loss event. The inverter will always
keep power available to the wall-mount units during a
power outage. In the event of a power outage, a power
loss relay in the wall-mount unit will be energized and
will only allow the blower and economizer to run while
powering the controller. The inverter converts either 24
VDC or 48 VDC, depending on the model, to 230 VAC.
A relay output from the inverter will also communicate
an alarm to the supervisory controller in the event of
an inverter failure. This variable can be communicated
through the Ethernet port for integration into a building
management system. The units will continue to run in
economizer-only operation until power has been restored
or the battery power has been depleted.
When the wall-mount unit is operating under inverter
power, shelter economizer cooling will only occur if
outside temperatures fall below indoor temperatures and
blower speeds are slightly reduced to conserve battery
power.
