Zone Sensor
Zone Sensor
The ZN510 controller accepts the following zone sensor inputs:
zSpace temperature mea- surement.
zLocal setpoint (internal or external on the zone sensor).
zFan switch. (Optional)
zTimed override (ON and CANCEL).
zCommunication Jack.
If both hardwired and communicated space temperature
values exist, the controller ignores the hardwired space temperature input and uses the communicated value.
Internal and External Setpoint Adjustment
Zone sensors with an internal or external setpoint adjustment provide the ZN510 controller with a local setpoint (50 to 85 F or 10 to 29.4 C). The internal setpoint adjustment is concealed under the zone sensor’s cover. To reveal the adjustable setpoint wheel, remove the zone sensor cover. The external setpoint
(when present) is exposed on the zone sensor’s front cover.
When the hardwired setpoint adjustment is used to determine the setpoints, all unit setpoints are calculated based on the hardwired setpoint values, the configured setpoints, and the active mode of the controller.
Setpoint Operation
The controller has three methods of heating and cooling setpoints operation. See Table 5 for the methods of setpoint operation.
Table 5: Methods of setpoint operation.
Method | Situation used | |
|
| |
Zone Sensor | A hardwired, adjustable setpoint is connected to the controller. Local setpoints are | |
(with an adjustable hardwired | ||
enabled in the unit configuration. No communicated setpoint is present. | ||
setpoint) | ||
| ||
|
| |
| A setpoint is communicated to the unit controller (typically from a building automation | |
| system or a peer controller). If both a hardwired setpoint and a communicated setpoint | |
Communicated source | exist, the controller uses the communicated value. The configuration feature for enabling | |
or disabling the local setpoint does not affect the setpoint handling when communicated | ||
| ||
| setpoints are used. The communicated setpoint always takes priority over the hardwired | |
| setpoint, even when the local setpoint is enabled. | |
|
| |
| The controller uses the locally stored default heating and cooling setpoints when neither | |
| a local hardwired setpoint or communicated setpoint is present. When a building | |
| automation system is present, the controller uses the default setpoints when no setpoint | |
Stored default setpoints | is communicated to the controller and no hardwired setpoint exists. The controller uses | |
| stored default setpoints when only a local setpoint exists, but the local setpoint is | |
| disabled in the configuration of the controller. The controller always uses the stored | |
| default (unoccupied) setpoints in unoccupied mode. | |
|
|
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