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Freeze Sentinel
The freeze sentinel is enabled by a dip switch
and is dependant on the room air thermistor. The
FREEZ S dip switch must be down for freeze sentinel
operation.
FREEZ S switch DOWN = ON
(preset from factory)
FREEZ S switch UP = OFF
The freeze sentinel turns on the resistance heater(s)
and indoor fan when the room air thermistor sees
41°F. When the temperature of the room has risen
to 46°F, the unit will turn off.
The freeze sentinel will remain enabled when the
unit has been turned off by the remote CDC.
Energy Management System
Note:
The following conditions must exist for the
energy management system to operate:
• OCCUPIED dip switch is up.
• Door sensor kit is installed.
• Motion sensor kit is installed.
The energy management system uses input from
the door sensor and motion sensor to establish if
the room is occupied or unoccupied. When the
energy management system has established that
the room is unoccupied, it uses input from the room
air thermistor and allows the temperature of the
room to lower to 68 °F (heat mode) or raise to 78 °F
(cool mode). When the room becomes occupied,
the energy management system will return to
thermostat-controlled operation and will return the
room to the temperature set on the controls.
Door Sensor
The door sensor has a two-wire circuit that is
connected to the main board terminal strip. When
the door opens, the door sensor (switch) closes.
When the energy management system sees the
door sensor circuit close (door opened), the energy
management system will then check the motion
sensor circuit.
Motion Sensor
The motion sensor has a 2-wire circuit that is
connected to the main board terminal strip. The
motion sensor is an electronic sensor that, when
motion is sensed, closes a switch (internal to the
sensor), completing the motion sensor circuit.
After the energy management system has seen
the door sensor circuit closed (door opened), it
will check the motion sensor circuit. If the energy
management system sees the motion sensor circuit
closed (no motion detected by the sensor), it will
then check the temperature being reported by
the room air sensor. If the energy management
system sees the motion sensor circuit open (motion
detected by sensor), the unit will continue to be
controlled by the user settings.
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