Carrier 53DFS250-SL owner manual Minimum HEAT/COOL SET Point Difference, Setup

_C	Select thermostat		U
	operation	in degrees
	Fahrenheit	or Celsius.
	F

_J

_On	Select	the display back-
	light always On, or OI1'
		ON
	after	8 seconds.
	off

n, nN

M,uu

(_	Adjust		the	preoccupancy
	fan	purge		timer.
	0:00	=	off
	0 - 3 hours.

'Soft Start'. This is used Select the unit ID for

	in multiple installs		to
(_	on times. 0 = off.		turn
	stagger	equipment
	Each Number = (3Oseconds)
	second	delay.
	(0 to 99)

Press the Mode button, While holding the Mode, press the Program button leave the Setup screens. If no buttons are pressed, the display will leave the

setup screens after 30 seconds,

					Advanced			Setup	Table
STEP				DESCRIPTION					RANGE		FACTORY
NO.											DEFAULT
1	Time	of day clock set							24 hour		12:00 Am
2	Day of the week								Su - Sa		Mo
3	Heat	Pump							Off / On		Off
4	Deadband				or Temperature			swing	1 -	6 F	2 F
	Forced		minimum difference					heat/
5	,_ool								0 -	6 F	2 F
6	Cycles		per		hour				d, dl,	2 - 6	6
7	Security			Levels					0 - 3		0
8	Maximum			allowable		Heat	set point		35 -	99 F	80 F
9	Minimum			allowable		Cool	set point		35 -	99 F	65 F
10	Fahrenheit				or Celsius				F /	C	F
11	Thermeglow				TM backlight				Off /	On	On
12	Fan	Purge			timer				0:00 - 3:00		0:00 min.
									min.
13	Soft	Start							0 - 99		0

CLOCK BACKUP -- In the event of a power loss, the thermostat internal clock will continue to keep proper time for a minimum of 48 hours without external power or batteries.

TWO-STAGE OPERATION -- The Second Stage of heat (Heat pump models only) is turned on when

(1)the first Stage has been on for a minimum of two minutes, and (2) the temperature spread from the set point is equal to or greater than: the setpoint temperature plus the deadband, plus 2 degrees.

Heatif_gCooBf_g

	turn on	turn on Set Point Set Poi_t	turne4_
3rd S_age	2rid Stage	1st Stage	Low	Med	H_gh _	Fan Speeds
High	Med	Low

•MINIMUM HEAT/COOL SET POINT DIFFERENCE

--The Heat and Cool set point temperature will not be allowed to come any closer to each other than the value set in Advanced Setup Step 5, on page 4. This minimum difference is enforced during Auto changeover and Program On operation.

•ENERGY SAVING SMART FAN -- If Fan On is

selected, the fan will run continuously at all times, except in Off, and will only run if there is a heating or cooling demand in Unoccupied periods.

•OVERRIDE -- As explained on page 3, pressing the Override button during a programmed, Unoccu- pied period will force the thermostat into Occupied 1, temporarily, up to 4 hours. If the Override button is pressed during an Occupied period, the thermo- stat will be forced into Unoccupied and the occu- pied number (1,2 or 3), it was forced out of will be turned off, only for that day.

During Override periods the set point temperature

may be adjusted, but they will not be remembered after Override ends.

•HEAT-- First Stage = Heat Pump. Second Stage = Heat Pump and Electric Heat.

•FAN PURGE TIMER -- When this feature is acti- vated, the fan will turn on during Unoccupied at a preset amount of time prior to Occupied 1. This pre- occupancy fan purge timer may be set as instructed

on this page, Step 12, from 0 to 3 hours. 0 = this feature turned off.

•KEYPAD LOCK -- To prevent unauthorized use of the thermostat, the front panel buttons may be dis- abled. To disable, or 'lock'the keypad, press and hold in the Mode button. While holding the Mode button in, press the Up and Down buttons in together. The Locked icon will appear on the display.

__= l_ pm unoccu#ied

Keypad	Lockout \	......../	"_	ON
Press	all 3 for	<	_	Locked

To unlock the buttons, again press and hold the Mode button. While holding the Mode button in, press the Up and Down buttons in together. The Locked icon will disappear from the display.

DRY CONTACT SWITCH -- The terminals are 'nor- mally open'.Closing or completing the circuit will

cause the thermostat to enter Occupied 1. This fea- ture allows an external device such as a Central

Time Clock, Occupancy Sensor, or a Telephone activated device to force 1 or more thermostats into

Occupied 1. For the Dry Contact to work the ther- mostat must be in Program On. Set Occupied 1

to Offforall 7days, so the Contact closure will be in control. When the thermostat is forced into

Occupied 1 via the Dry Contact closure, the icon Occupied 1 will blink.

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