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HRT4-ZW Battery Powered Wall Thermostat

This describes the Z-Wave device HRT4-ZW, manufactured by Horstmann Controls Limited with the thing type UID of horstmann_hrt4zw_00_000.

The device is in the category of HVAC, defining Air condition devices, Fans.

HRT4-ZW product image

The HRT4-ZW does not permanently listen for messages sent from the controller - it will periodically wake up automatically to check if the controller has messages to send, but will sleep most of the time to conserve battery life. The wakeup period can be configured in the user interface - it is advisable not to make this too short as it will impact battery life - a reasonable compromise is 1 hour. The wakeup period does not impact the devices ability to report events or sensor data. The device can be manually woken with a button press on the device as described below - note that triggering a device to send an event is not the same as a wakeup notification, and this will not allow the controller to communicate with the device.

Overview

Note: This device is also sold as Secure SRT321

Channels

The following table summarises the channels available for the HRT4-ZW -:

Channel Channel Id Category Item Type
Switch switch_binary Switch Switch
Sensor (temperature) sensor_temperature Temperature Number
Thermostat mode thermostat_mode Temperature Number
Setpoint (heating) thermostat_setpoint Temperature Number
Battery Level battery-level Battery Number

Switch

Switch the power on and off.

The switch_binary channel supports the Switch item and is in the Switch category.

Sensor (temperature)

Indicates the current temperature.

The sensor_temperature channel supports the Number item and is in the Temperature category. This is a read only channel so will only be updated following state changes from the device.

Thermostat mode

Sets the thermostat.

The thermostat_mode channel supports the Number item and is in the Temperature category. The following state translation is provided for this channel to the Number item type -:

Value Label
0 Off
1 Heat
2 Cool
3 Auto
4 Aux Heat
5 Resume
6 Fan Only
7 Furnace
8 Dry Air
9 Moist Air
10 Auto Changeover
11 Heat Economy
12 Cool Economy
13 Away
15 Full Power
31 Manufacturer Specific

Setpoint (heating)

Sets the thermostate setpoint.

The thermostat_setpoint channel supports the Number item and is in the Temperature category.

Battery Level

Represents the battery level as a percentage (0-100%). Bindings for things supporting battery level in a different format (e.g. 4 levels) should convert to a percentage to provide a consistent battery level reading.

The battery-level channel supports the Number item and is in the Battery category.

Device Configuration

The following table provides a summary of the 3 configuration parameters available in the HRT4-ZW. Detailed information on each parameter can be found in the sections below.

Param Name Description
1 Enable Temperature Sensor Controls the use of the temperature sensor on the device
2 Temperature Scale Controls the temperature sensor scale
3 Delta T Defines the temperature steps of the heating control. Steps are 0.1 K
  Wakeup Interval Sets the interval at which the device will accept commands from the controller
  Wakeup Node Sets the node ID of the device to receive the wakeup notifications

Parameter 1: Enable Temperature Sensor

Controls the use of the temperature sensor on the device

The following option values may be configured -:

Value Description
0 Disable
255 Enable

The manufacturer defined default value is 0 (Disable).

This parameter has the configuration ID config_1_1 and is of type INTEGER.

Parameter 2: Temperature Scale

Controls the temperature sensor scale

The following option values may be configured -:

Value Description
0 Celsius
255 Fahrenheit

The manufacturer defined default value is 0 (Celsius).

This parameter has the configuration ID config_2_1 and is of type INTEGER.

Parameter 3: Delta T

Defines the temperature steps of the heating control. Steps are 0.1 K

Values in the range 0 to 255 may be set.

The manufacturer defined default value is 10.

This parameter has the configuration ID config_3_1 and is of type INTEGER.

Wakeup Interval

The wakeup interval sets the period at which the device will listen for messages from the controller. This is required for battery devices that sleep most of the time in order to conserve battery life. The device will wake up at this interval and send a message to the controller to tell it that it can accept messages - after a few seconds, it will go back to sleep if there is no further communications.

This setting is defined in seconds. It is advisable not to set this interval too short or it could impact battery life. A period of 1 hour (3600 seconds) is suitable in most instances.

Note that this setting does not affect the devices ability to send sensor data, or notification events.

This parameter has the configuration ID wakeup_interval and is of type INTEGER.

Wakeup Node

When sleeping devices wake up, they send a notification to a listening device. Normally, this device is the network controller, and normally the controller will set this automatically to its own address. In the event that the network contains multiple controllers, it may be necessary to configure this to a node that is not the main controller. This is an advanced setting and should not be changed without a full understanding of the impact.

This parameter has the configuration ID wakeup_node and is of type INTEGER.

Association Groups

Association groups allow the device to send unsolicited reports to the controller, or other devices in the network. Using association groups can allow you to eliminate polling, providing instant feedback of a device state change without unnecessary network traffic.

The HRT4-ZW supports 5 association groups.

Group 1: Thermostat Mode Set

This group supports 4 nodes.

Group 2: Binary Switch Set

This group supports 4 nodes.

Group 3: Unsolicited Battery Level Reports

This group supports 4 nodes.

Group 4: Thermostat Set Point Reports

This group supports 4 nodes.

Group 5: Unsolicited Sensor Multilevel Reports

This group supports 4 nodes.

Technical Information

Endpoints

Endpoint 0

Command Class Comment
COMMAND_CLASS_NO_OPERATION_V1  
COMMAND_CLASS_BASIC_V1  
COMMAND_CLASS_SWITCH_BINARY_V0  
COMMAND_CLASS_SENSOR_MULTILEVEL_V1  
COMMAND_CLASS_THERMOSTAT_MODE_V0  
COMMAND_CLASS_THERMOSTAT_SETPOINT_V1  
COMMAND_CLASS_CONFIGURATION_V1  
COMMAND_CLASS_MANUFACTURER_SPECIFIC_V1  
COMMAND_CLASS_BATTERY_V1  
COMMAND_CLASS_WAKE_UP_V2  
COMMAND_CLASS_ASSOCIATION_V1  
COMMAND_CLASS_VERSION_V1  

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