> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.kodelabs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Optimized start/stop on mobile

> Set OSS operation modes, scope equipment, and review active status from the OSS module on the KODE OS mobile app.

Optimized start/stop (OSS) starts HVAC equipment just in time so zones hit their setpoint by occupancy, instead of running on a fixed schedule. On mobile, choose how aggressively the system pre-heats or pre-cools zones and control which equipment participates. This page follows [OSS](/products/kode-os/oss) on the web.

## Open OSS

Select `OSS` from the building app launcher (label varies by site).

<div className="flex justify-center w-full my-4">
  <Frame className="w-fit mx-auto">
    <img className="mx-auto block h-auto max-w-[400px] w-full" src="https://mintcdn.com/kodelabs/MYYnSdKhTqQf34f4/images/mobile-app/kode-os-mobile-oss-optimizations.png?fit=max&auto=format&n=MYYnSdKhTqQf34f4&q=85&s=4fcdc3d7fd4c60957fb44440b2173a20" alt="OSS screen with Balanced selected, FCU and VAV counts, and OSS is active status" width="400" height="867" data-path="images/mobile-app/kode-os-mobile-oss-optimizations.png" />
  </Frame>
</div>

The footer shows whether OSS is running for the current site (for example, `OSS is active`). Use the notification bell when your site sends OSS alerts.

## Operation mode

Three radio options set the optimization strategy for scoped equipment:

| Mode            | Goal                                                            |
| --------------- | --------------------------------------------------------------- |
| `Comfort`       | All zones on setpoint by occupancy start; comfort first         |
| `Balanced`      | Third quartile of zones on setpoint; balance comfort and energy |
| `Energy Saving` | Median of zones on setpoint; energy first                       |

Tap the info icon next to the title to open definitions, then `Close` to return.

<div className="flex justify-center w-full my-4">
  <Frame className="w-fit mx-auto" caption="Operation mode help sheet">
    <img className="mx-auto block h-auto max-w-[400px] w-full" src="https://mintcdn.com/kodelabs/MYYnSdKhTqQf34f4/images/mobile-app/kode-os-mobile-oss-operation-mode-info.png?fit=max&auto=format&n=MYYnSdKhTqQf34f4&q=85&s=48747c73c169473cc7ff97e34225ff86" alt="Modal describing Comfort, Balanced, and Energy Savings operation modes" width="400" height="867" data-path="images/mobile-app/kode-os-mobile-oss-operation-mode-info.png" />
  </Frame>
</div>

Select a mode to apply it for the building. Your site may require OSS to be activated on web before mobile shows `OSS is active`.

## Equipment scope

Below `Operation Mode`, `OSS` lists equipment groups included in the run:

| Row               | Meaning                                       |
| ----------------- | --------------------------------------------- |
| `FCUs 40/40`      | Forty fan coil units in scope on Floor 2      |
| `VAVs 14/14`      | Fourteen variable air volume boxes on Floor 2 |
| `AHU Floor 2 2/2` | Two air handlers on Floor 2                   |
| `AHU Floor 1 2/2` | Two air handlers on Floor 1                   |

The fraction is included devices / total devices in that category. Tap a row to add or remove individual units when your role allows configuration on device.

## Add or remove devices

Opening a category (for example, `FCUs`) shows a checklist of units. Clear or select rows, then tap `Save` to update scope.

<div className="flex justify-center w-full my-4">
  <Frame className="w-fit mx-auto" caption="FCUs add/remove devices">
    <img className="mx-auto block h-auto max-w-[400px] w-full" src="https://mintcdn.com/kodelabs/MYYnSdKhTqQf34f4/images/mobile-app/kode-os-mobile-oss-add-remove-devices.png?fit=max&auto=format&n=MYYnSdKhTqQf34f4&q=85&s=b75cbf90714bbf523ecde549aa9f2379" alt="FCUs Add Remove devices modal with FCU_101 through FCU_106 checked and Save button" width="400" height="867" data-path="images/mobile-app/kode-os-mobile-oss-add-remove-devices.png" />
  </Frame>
</div>

| Control          | Action                                               |
| ---------------- | ---------------------------------------------------- |
| Checkbox         | Include or exclude a unit from OSS for this category |
| `40/40` (header) | Selected count versus total in the group             |
| `Save`           | Apply changes and return to `OSS`                    |

Excluding a device removes it from the next optimization cycle for that adapter—the configuration that customizes OSS for a specific HVAC system. Use web [OSS](/products/kode-os/oss) for adapter setup, learning mode, bypass, and dashboard history when those controls are not on mobile.

## Compare to web

| Capability                                          | Web  | Mobile                                 |
| --------------------------------------------------- | ---- | -------------------------------------- |
| Operation mode (Comfort / Balanced / Energy Saving) | Yes  | Yes                                    |
| Per-category device scope                           | Yes  | Yes (add/remove modal)                 |
| Activate OSS / learning / bypass                    | Full | Status shown; advanced controls on web |
| Performance dashboard and trends                    | Full | Not shown on mobile                    |

## Next steps

<CardGroup cols={2}>
  <Card title="Schedules on mobile" icon="calendar" href="/products/mobile-app/operations/schedules" arrow={true}>
    Edit weekly days, special events, and holidays.
  </Card>

  <Card title="Systems on mobile" icon="network" href="/products/mobile-app/destinations/systems" arrow={true}>
    Switch dashboard, graphic, and widget views.
  </Card>

  <Card title="OSS on web" icon="monitor" href="/products/kode-os/oss" arrow={true}>
    Adapter setup, learning, and dashboards.
  </Card>
</CardGroup>