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| Overview

Mechanical lockouts are features in the 75F system, that are introduced to either enable or disable the locking out or shutting down the mechanical cooling and heating systems in the building. The mechanical cooling and heating are replaced by the outside air via the economizer for cooling or heating, based on the outside air temperature.

The lockout features are also provided with an option to preset a temperature value, based on whether the actual lockout is actuated or not. 

This protects the HVAC unit under bad weather conditions and provides energy efficiency.

Note: The lockouts do not affect any zone profiles, operation of the OAO logic, and the heatingLoopOutput or the CoolingLoopOutput in any way.

Accessing Lockout

The lockout options can be accessed from the CCU.

To access the lockout options.

From the CCU zones page.

  • Click the setting 1.png icon.

2.png

The Floor Layout screen is displayed.

  • Click Settings option.

3.png

The settings screen is displayed.

  • Click the Installer options icon 4.png

5.png

The Installer options screen is displayed, and under the pairing start address section, the lockout options are displayed, which can be enabled or disabled.

6.png

The toggle for the Use Outside Temp Lockout Cooling is enabled, to disable mechanical cooling based on the Outside Air Temperature.

The toggle for the Use Outside Temp Lockout Heating is enabled, to disable mechanical Heating based on the Outside Air Temperature.

By default, the Toggle button is disabled and can be manually enabled.

When a OAO is paired as a system profile, under a CCU as below.

mceclip7.png

The Use Outside Temp Lockout Cooling is auto-enabled, disabling the mechanical cooling based on the outside air temperature as below.

11.png

The enabled cooling lockout option is provided with an option to set a lockout temperature limit, and when the Outside Air Temperature is below this set temperature, there will be no mechanical cooling.

By default, the temperature limit value for the cooling lockout is 50 degrees Fahrenheit, and the same can be modified using the dropdown values.

The auto-enabled cooling lockout can be disabled manually using the toggle.

Similarly, the Use Outside Temp Lockout Heating can be enabled as below.

9.png

The manually enabled heating lockout option is also provided with an option to set a lockout temperature limit, and when the Outside Air Temperature is above this set temperature, there will be no mechanical heating.

By default, the temperature limit value for the cooling lockout is 80 degrees Fahrenheit, and the same can be modified using the dropdown values.

The auto-enabled heating lockout can be disabled manually using the toggle.

| Formula Based Scenarios

Below are a few formula-based scenarios, where either the lookout happen and the mechanical cooling or heating is not available, or the lockout do not happen and the mechanical cooling or heating is available

For Mechanical Cooling Lockout 

When the set lockout temperature is 50F, where

For Mechanical Heating Lockout,

When the set lockout temperature is 80F, where

When, systemCoolingLoopOutput >0%  and the useOutsideTempLockoutCooling is Enabled and,

If Outside Air Temperature < outsideTempCoolingLockout,

Then, Mechanical Cooling is not available

When, systemHeatingLoopOutput > 0%  and the useOutsideTempLockoutHeating  is Enabled and,

If Outside Air Temperature > outsideTempHeatingLockout,

Then, Mechanical Heating is not available

When, systemCoolingLoopOutput >0%  and the useOutsideTempLockoutCooling is Enabled and,

If Outside Air Temperature > outsideTempCoolingLockout,

Then, Mechanical Cooling is available

When, systemHeatingLoopOutput >0%  and the useOutsideTempLockoutHeating  is Enabled and,

If Outside Air Temperature < outsideTempHeatingLockout,

Then, Mechanical Heating is available

 

Mechanical Cooling & Heating Widget

 

The mechanical cooling and heating can be observed under the internal portal through the Lockouts widget for the internal portal

  • Login to the Internal portal
  • Hover on the Lockouts Widget

The mechanical cooling and mechanical heating status can be observed.

10.jpg

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