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Add opentherm_gw.set_central_heating_ovrd documentation (#13082)

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source/_integrations/opentherm_gw.markdown
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@ -77,6 +77,24 @@ Reset the OpenTherm Gateway.
| ---------------------- | -------- | ----------- |
| `gateway_id` | no | The `gateway_id` as specified during configuration.
### Service `set_central_heating_ovrd`
Set the central heating override option on the gateway.
When overriding the control setpoint (via a [set_control_setpoint](#service-opentherm_gwset_control_setpoint) service call with a temperature value other than 0), the gateway automatically enables the central heating override to start heating. This service can then be used to control the central heating override status.
To return control of the central heating to the thermostat, call the [set_control_setpoint](#service-opentherm_gwset_control_setpoint) service with temperature value 0.
**You will only need this if you are writing your own software thermostat.**
| Service data attribute | Optional | Description |
| ---------------------- | -------- | ----------- |
| `gateway_id` | no | The `gateway_id` as specified during configuration.
| `ch_override` | no | The desired value for the central heating override. Use `0` to disable or `1` to enable.
<div class='note'>
Please read [this information](http://otgw.tclcode.com/standalone.html) from the designer of the OpenTherm Gateway before considering to write your own software thermostat.
</div>
### Service `opentherm_gw.set_clock`
Provide the time and day of week to the OpenTherm Gateway. The value provided here will be forwarded to the thermostat on the next date/time request from the thermostat. The OpenTherm Gateway does not have the ability to accurately keep track of time, so it will only retain the information provided here for a maximum of about 61 seconds.