TEC20x6(H)-4 and TEC20x6H-4+PIR Series Wireless Thermostat Controllers with Dehumidification
Capability, Fan Control, and Occupancy Sensing Capability
10
If the thermostat is in Cooling demand:
•
the chilled water valve opens to 100%
•
the thermostat stages Heating to maintain the room
temperature at the Cooling setpoint, as sensed by
the thermostat
If the thermostat is in Cooling demand and the room
temperature rises 2F°/1C° above the Cooling setpoint,
the thermostat automatically disables dehumidification
operation. Likewise, if the thermostat is in Cooling
demand and the room temperature falls below the
current Heating setpoint, the thermostat disables
dehumidification operation.
Occupancy Sensor Operation –
TEC20x6H-4+PIR Series Thermostat
Controllers
A TEC20x6H-4+PIR Series Thermostat Controller–or a
TEC20x6(H)-4 Series Thermostat Controller equipped
with a PIR accessory cover–provides advanced
occupancy logic.
Note:
The PIR strategy is an occupied strategy. If the
thermostat controller is programmed to be Unoccupied,
the PIR function does not have an effect on the
occupancy strategy.
The thermostat controller automatically switches
occupancy levels from Occupied to Stand-By and
Unoccupied as required, when local movement is
sensed.
Occupancy sensing is enabled only if a PIR cover is
installed on the thermostat controller (PIR models) or if
a remote input is configured as a remote PIR sensor
(
MotionNO
or
MotionNC
).
PIR Warm-Up Period
When a PIR cover is used and a thermostat controller
is powered up, there is a 1-minute warm-up period
before any local movement can be detected and
acknowledged by the PIR sensing device. The local
status LEDs for the PIR function are not active, and the
sensor is in Stand-By mode for the 1-minute period.
The PIR functionality and local movement status LEDs
are activated after the 1-minute warm-up period has
elapsed after the initial powering of the thermostat
controller. If movement is present, the mode changes
to Occupied.
PIR Diagnostic LEDs
The diagnostic LEDs inside the PIR lens brighten when
movement is detected within the first 30 minutes after
powerup. The LEDs do not light up or brighten after the
initial 30-minute period.
Setpoints
The Stand-By setpoints are under the same limitations
and restrictions as the Occupied and Unoccupied
setpoints. Stand-By setpoints reside between the
corresponding Occupied and Unoccupied setpoint
values.
The installer must be certain that the difference
between the Stand-By and Occupied values can be
recovered within a timely fashion to ensure occupancy
comfort. In addition, the difference between the two
values must be large enough to warrant maximum
energy savings.
Hotel and lodging applications can benefit from the
addition of an entry door switch wired to one of the
binary inputs of the thermostat controller. When a door
contact is used and configured, the Stand-By timer and
its configuration are no longer active or used. The
occupancy toggle between Occupied and Stand-By is
then dictated by both the door contact and the
PIR sensing device used. If movements are detected
by the PIR sensor and the door is closed, the room is
considered occupied. The thermostat controller
switches back to Stand-By mode only if the door switch
toggles open/closed. Motion is ignored when the door
switch indicates an open door.
PIR occupancy functionality is dictated by both the
Stand-By timer and Unoccupied timer configuration
value and movements present in the area.
Unoccupied Timer Disable
It might be preferable for the local area to stay out of
Unoccupied mode and always stay at the Stand-By
occupancy level when no activity is present. In
instances when areas always need to be on Stand-By
status, ready to respond to demand at any given point
in time, we recommend disabling the Unoccupied timer.
When the local PIR occupancy routine is running at the
thermostat controller, the zone drifts into Unoccupied
mode when the Unoccupied timer is set above its
factory default value of 0.0 hours.
For more information on occupancy sensor operation,
refer to the
TEC2x45-4, TEC2xx6(H)-4,
TEC2xx6H-4+PIR, and TEC2xx7-4 Series Thermostat
Controllers Application Note (LIT-12011594).
