Functional Parameters

Functional Parameters let you configure operating behavior such as economy delays, airflow, defrost intervals, Start-Stop timing, overrides, and display preferences. You must be in Advanced User mode to access them.

Accessing Functional Parameters

Economy Settings

0 to 255 minutes (one-minute increments). Sets how long the unit remains in low speed after starting before transitioning to high speed in Start-Stop Operation.

0 to 255 minutes (one-minute increments). Sets how long the unit remains in low speed after starting before transitioning to high speed in Continuous Operation.

• YES — FUELSAVER, controls for maximum fuel economy • ECO — Uses very low speed instead of low speed in Continuous Run within the temperature control band • NO — Optional ECO third speed is not activated

• NORMAL — Engine cycles between High Speed and Low Speed based on compartment temperature • HIGH — Engine remains in High Speed continuously, used for heat-generating loads such as produce that require constant high airflow

Defrost Timer

The defrost timer automatically initiates a defrost cycle at the selected interval if DTT is below 40°F (4.4°C) or SAT is below 45°F (7.2°C). Shorter times are generally used for warm, humid products like produce. Longer times can be used for dry and frozen products.

FreshProtect

• OFF — FreshProtect is turned off • A through E — Each places an individual flexible limit on how far below setpoint the supply air temperature can drop in Continuous Operation with a setpoint above 32°F (0°C)

Temperature Control Mode

• RETURN AIR — Unit controls so return air (entering the evaporator) matches setpoint; generally considered a good sampling of actual product temperature • SUPPLY AIR — Unit controls so supply air (leaving the evaporator) matches setpoint when setpoint is above 10.4°F (-12°C); in frozen range the unit controls return air instead • CURB RETURN AIR — For units equipped with CURB RAT, temperature is controlled based on return air at the CURB RAT location

Out-of-Range and AutoFresh

Sets the number of degrees away from setpoint the temperature may drift before it is considered "Out-Of-Range" and the configured alarm or shutdown action activates. Refer to alarm 00053 Box Temp Out-of-Range for more information.

• CLOSED — Assembly will be closed • OPEN — Assembly will be open if the engine is running and setpoint is greater than 28.0°F (-2.22°C) • CFM CONTROL — Assembly cycles open and closed over a 20-minute period based on the Auto Fresh Air Control parameter; active only if the engine is running and setpoint is greater than 28.0°F (-2.22°C)

5 to 50 CFM (in 5 CFM increments). When CFM Control is selected, this sets the amount of air to be exchanged during each 20-minute cycle.

Start-Stop Settings

• Together — The same settings apply to any setpoint (six settings, with the sixth applicable to frozen range only) • Separate — Settings differ between perishable and frozen ranges (eleven settings: five perishable, six frozen)

60 minutes default (in one-minute increments). Determines the minimum run time for perishable/frozen setpoints in Start-Stop Operation.

10 to 90 minutes (in one-minute increments). Determines the minimum off time for perishable/frozen setpoints in Start-Stop Operation.

5 to 18°F / 0.28 to 10°C (in 0.5° increments). After Minimum Off Time, if compartment temperature drifts this far above or below setpoint (perishable) or above setpoint (frozen), the unit will restart.

3.6 to 18°F / 2 to 10°C (in 0.5° increments). During Minimum Off Time, if compartment temperature drifts this far above or below setpoint (perishable) or above setpoint (frozen), the unit overrides Minimum Off Time and restarts.

10 to 255 minutes (one-minute increments), or OFF. When a value is selected, this is the longest the unit will remain off during a Start-Stop off cycle. When this time expires, the unit restarts for the Minimum Run Time regardless of compartment temperature.

0°F to 1.1°F / 0°C to 0.6°C (in 0.1° increments). Applies only to frozen setpoints in Start-Stop Operation. This offset is the number of degrees below setpoint the unit will run before cycling off, allowing a lower average compartment temperature to compensate for temperature rises during off cycles.

Overrides

If all switches are configured as "Switch Not Installed," this parameter will not display. • NO — System responds to the switch as configured • YES (NO RESET) — Switch action is overridden to alarm only; remains until manually changed back to NO • YES (RESET) — Switch action is overridden to alarm only; reverts to NO on a power cycle

If the fuel sensor is configured to NO, this parameter will not display. • NO — System responds to the sensor as configured • YES (NO RESET) — Fuel level sensor shutdown is overridden until changed back to NO • YES (RESET) — Fuel level sensor shutdown is overridden until a power cycle, then reverts to NO

Viewing Preferences

• Temperature — Fahrenheit (°F) or Celsius (°C) • Pressure — psig or bar • Date — US (MM/DD/YYYY) or European (DD/MM/YYYY) • Alarm Display — YES shows alarm code and description in Driver mode; NO shows alarm code only • Contrast — 0 to 63 (single digit increments); higher numbers increase display contrast