Carrier 53DFS250-SL Button, When Active Display Counts Down Remaining Days, Blinking Appear

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:

oHOLIDAY ©

			H_[					When		active
								the	display
								counts		down
								remaining			days
					PJII_I			Unoccupied			also
								blinking,
@	S							appear&
		Press	the	Up or	Down		buttons	to select		the
".......... -'		number	of	days	the	thermostat		will be	in
_:	)	Holiday	mode.		0 =	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.

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.

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, no. 1 = turn on 30 seconds after Dry Contact clo- sure, no. 2 = turn on 60 seconds after closure,

no. 3 = turn on 90 seconds after closure, and so on.

See page 5, Step 13, to configure the thermostat for Soft Start.

DUAL SET POINT BEHAVIOR --The adjustable set point range is: 35 to 99 degrees in Fahrenheit and 7 to 35 degrees in Celsius. 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 5, page 4.

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 point temperatures 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 point temperatures closer together, enter the Cool or Heat mode by pressing the Mode button, then adjust the set point temperatures closer together. Heat is limited to how close it can come to Cool by Step 5, page 4.

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
		on the Remote	Sensor
		works slightly	different
		than the Override but-
Optiona_		ton on the front panel.
		Each press of the
Remote	Sensor	'External'Override but-
Optional Sensor		ton adds 2 hours to the
		override timer,	if the

timer was 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 Fan button for 5 seconds. All icons will appear. Press and hold in the Fan button until Fd appears. This resets all factory settings. To calibrate room temperature, press the Up and Down buttons at the same time twice. At this point use the Up and Down buttons to calibrate room temperature, if needed. Press the Mode button to return to normal operation.

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