Installation - Zone Sensors
68
UNT-SVX07E-EN
Sensor Operations
Temporary Occupancy (Timed Override)
Temporary occupancy (timed override) is available on
model WDS. Temporary occupancy is selected for after-
business-hours adjustment of temperature setting, fan
settings, or heat/cool settings, when the system has
changed to unoccupied mode. System control will revert
to unoccupied after a pre-determined time period.
Note:
Not all systems support the occupancy function.
To request and cancel temporary occupancy on a model
WDS sensor, see
“Requesting Temporary Occupancy,”
page 73
.
End-of-Range Temperature Values
Receiver: The end-of-range temperature limits of the
receiver for all models are 32°F to 122°F. The receiver
cannot replicate temperature values outside this range. If
the sensor transmits a temperature value to the receiver
that is out of the receiver replication range, the receiver
will “freeze” the output at the end-of-range values. This
value will remain frozen until the transmitted temperature
moves to between the end-of-range temperature limits.
Sensor: The end-of-range temperature setpoint limits for
the WDS is 50°Fto 89.6°F.
Receiver Power-up Sequence
When power is applied to the receiver, one of the following
sequences occurs. The sequence is dependent on the
address setting and the association status of the receiver.
Address set to 000 and receiver is not
associated with a sensor
•
LED5 is constantly On, indicating power is applied and
the receiver is functional.
•
All models: Zone temperature and cooling setpoint
default to 72.5°F.
WDS only: The heating setpoint defaults to 70.5°F and
the fan/system output will be 2230
Ω
(see
“Failure and
Default Modes,” page 135
).
•
Status LED3 will display a 2-blink pattern diagnostic
(
Table 45, page 118
).
Address set from 001 to 999 and receiver is not
associated with a sensor
•
LED5 is constantly On, indicating power is applied and
the receiver is functional.
•
All models: Zone temperature and cooling setpoint
default to 72.5°F.
WDS only: The heating setpoint defaults to 70.5°F and
the fan/system output will be 2230
Ω
(see
“Failure and
Default Modes,” page 135
).
•
The receiver conducts an energy scan for 20 seconds to
determine the clearest channel on which to operate.
•
LED3 flashes On every 2 seconds when it is ready to
accept a sensor association request. When an
association request is made by a sensor, the receiver
instructs the sensor on which power level to operate.
Then the receiver and sensor begin operation at the
appropriate channel and power level (see
“Observing
Receiver for Readiness,” page 66
).
Address set from 001 to 999 (and not changed
since most recent power-up) and receiver is
associated with a sensor
•
LED5 is constantly On, indicating power is applied and
the receiver is functional.
•
Zone temperature and setpoint default to 72.5°F. WDS
only: Heating setpoint defaults to 70.5°F, Fan = Auto,
System = Off.
•
The receiver waits for a broadcast transmission from
its associated sensor. When a transmission is received,
the receiver positions its zone temperature and
setpoint outputs appropriately.
•
If the receiver does not receive a communicated signal
from its associated sensor within 35 minutes, zone
temperature and setpoint outputs fail, generating a
unit controller alarm (see
“Failure and Default Modes,”
page 135
).
Note:
Once a receiver communicates to a WZS sensor,
the receiver disables (opens) its zone setpoint
output indefinitely.
Transmission Variables
Sensor transmission time variables are as follows:
•
The maximum time between sensor temperature
transmissions is 15 minutes.
•
The minimum time between sensor temperature
transmissions is 30 seconds.
•
The minimum time for transmitting temperature
setpoint changes is 10 seconds.
Note:
If a sensor transmits a message to the receiver and
the receiver does not reply, the sensor will
retransmit the message to the receiver every 30
seconds until communication to the receiver is re-
established.
Sensor temperature time variables are as follows:
•
The minimum change in zone temperature required to
force a sensor transmission is:
–
0.2°F when the temperature range is between 60°F
and 80°F
–
0.5°F when the temperature range is between 32°F
and 60°F or between 80°F and 122°F
•
The minimum change in temperature setpoint
required to force a sensor transmission is: 0.1°C for a
model WDS sensor
