GE AZ38H12DABM2 Owner's Manual And Installation Instructions page 6

Auxi/iaq controlson yourZoneline.
Remote Thermostat--Class 2
_._q_en this switch is enabled (UP}, it allows the
unit to operate with a Class 2 Remote Control
Wall Them_ostat. The trait controls are disabled.
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L CLASS 2 (Remote Thermostat)
Load Shedding (Central Desk Control)
This featm'e is active only if the trait is in
CDC mode. When this switch is enabled (UP),
the indoor tim can be tin'ned ON or OFF with
the trait controls.
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L_ LOAD SHEDDING (CDC)
Freeze Sentinel
_._l_en this switch is enabled (UP), it turns OFF
the fl'eeze sentinel protection ieatm'e. With the
switch disabled
(DOWN),
the fl'eeze sentinel is
acti\_ted, which automatically provides heat
without user inte_ti_ce. This helps to prevent
plumbing damage by turning the heater and
indoor
tim ON at 41°F and
OFF at 46°E
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t FREEZESen (Freeze Sentinel)
Constant ON Fan
"_._q_en this switch is enabled
(UP),
it allows the
indoor tim to run continuously at high speed,
exen if the trait is in the STOP
position.
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t DONST FAN (Constant
ON Fan)