Hoi

HOLIDAY MODE -- This feature forces the thermo-

stat into Unoccupied for a preset duration, up to

99 days. The Holiday setup display is entered as follows:

Press the Mode button. While holding Mode, press the Up button for 2 seconds to enter the time period programming setup

MODE O

The first step on the display prompts for maximum number of

Occupied periods ignore this prompt and press the Override button.

When active tile display counts down remaining days blinking.

When entering the Auto mode from Cool, the Heat and Cool set points will remain spread apart by the

amount that they were adjusted, prior to entering Auto.

For example: If the Cool set point was set to 80 while in the Cool mode and the Heat set point was adjusted to 70 while in the Heat mode, upon enter- ing the Auto mode the Heat and Cool set points would be 80 and 70. Both set points would then move up and down together, (in this example

spread by 10 degrees), by pressing the up or down buttons.

To move the Heat and Cool set points closer together, enter the Cool or Heat mode by pressing the Mode button, then adjust the set point(s) closer

appears

LIUnoccupied also

together. Heat is limited to how close it can come to Cool by Step 6, page 4.

Press the Up or Down buttons to select the number of days ?Y the thermostat will be in Holiday mode. O = Off. To exit Holiday

setup, press the Mode button.

The thermostat will enter the Holiday mode when the clock crosses midnight.

During Holiday mode Unoccupied set points are enforced.

REMOTE SENSORS (Optional Accessory) -- When connected to terminals RS+5, RS, and GND

on the back of the thermostat, the thermostat will read the temperature from the Remote Sensor and ignore the temperature sensor inside the thermo- stat. The thermostat automatically recognizes when a Remote Sensor is connected. When reading the temperature from the remote, the degree icon above the room temperature blinks once a second.

The Override button is active during Holiday mode. It will override to Occupied 1 settings up to 4 hours then return to Holiday mode. The Dry Contact Switch is ignored.

The thermostat will exit Holiday mode at midnight of the final programmed day. To terminate Holiday

immediately, enter the Holiday setup screen and select 0.

Optionamm,,li_mm

Remote Sensor

Optional Sensor

The Override button on the Remote Sensor

works slightly different than the Override button

on the front panel. Each

press of the 'External' Override button adds

2 hours to the override timer, if the timer was

SOFT START -- This feature is utilized in multiple thermostat installations controlled by the Dry Con- tact terminals. Assigning a unique Soft Start num- ber to each thermostat will stagger the turn on

times, even though the Dry Contact closes for all the thermostats connected at the same time. Each

Soft Start number represents a multiple of 30 sec- onds from the Dry Contact closure. For example,

1 = turn on 30 seconds after Dry Contact closure, 2 = turn on 60 seconds after closure, 3 = turn on 90 seconds after closure, and so on. See page 5, Step 14, to configure the thermostat for Soft Start.

DUAL SETPOINT BEHAVIOR -- The adjustable set point range is: 35 to 99 degrees in Fahrenheit and 7 to 35 degrees in Centigrade. When in the modes Heat or Cool, this adjustable range is unhampered.

When adjusting any Auto mode, including program- ming Occupied and Unoccupied periods, the ther- mostat will not allow the Heat set point to get closer to the Cool set point than the value programmed as the minimum difference in Step 6, page 4.

already active, the first button press will round the runtime to either 2:00 or 4:00.

Subsequent button presses will not wraparound as the Override button on the thermostat does, so the

second or greater button press will set the runtime to 4:00. The Locked feature has no effect on the

external Override button. The wired Remote Sensor is connected to the thermostat with up to 500 ft of

20 ga. or 300 ft of 18 ga. thermostat wire. See the Remote Sensor instructions for further details.

FACTORY DEFAULTS -- Before restoring factory defaults, set thermostat to OFF mode. If, for any reason it is desirable to return all stored settings back to the factory default settings, press the Mode button. While holding the Mode button in, press the Down button for 2 seconds. All icons will appear. Press and hold in the Override button until Fd appears. This resets all factory settings. To cali- brate room temperature, press the Mode button once more. At this point use the Up and Down

buttons to calibrate room temperature, if needed. Press the Mode button to return to normal

operation.

Page 6

53DFS250-FS specifications

The Carrier 53DFS250-FS is a distinguished addition to Carrier’s lineup of commercial refrigeration units. This model is specifically designed to provide efficient and reliable cooling for various applications, making it a go-to choice for food service operators, grocery stores, and convenience stores. The 53DFS250-FS is known for its robust construction and advanced technologies that enhance its performance and energy efficiency.

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