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

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(_	Adjust	the	minimum
	allowable		cool	set point
	when	security		is in effect.

if Step 8 is not 0.) (Step 10 only appears

(35 to 99 F)

• 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.

• MINIMUM HEAT/COOL SET POINT DIFFERENCE

-- The Heat and Cool set points will not be allowed

to come any closer to each other than the value set

in Advanced Setup Step 6, on page 4. This mini-

_)CSelect thermostat operation in degrees

j)Fahrenheit or Centigrade.

F

	On
(_	Select	the	display back-
	light always On, or Off
	after 8 seconds.
	off
(_	Adjust	the	preoccupancy
_j)	O:O0 =	off

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

in multiple installs to

stagger equipment turn

F

ON

_'nR

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I_

mum 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. If

fan is in Off Mode it will only run if there is a heating

or cooling demand during programmed unoccupied

periods.

• OVERRIDE -- As explained on page 2, 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 period (1,2 or 3), it was forced out of will be

turned off, only for that day.

• During Override periods the set points may be

adjusted, but they will not be remembered after

Override ends.

• 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 13, from 0 to 3 hours. 0 = this

on times. 0 = off.

Each increment = 30 second delay.

(0 to 99) P.dl_l

Select the sensor type: Yes = Outside or Duct

sensor

No =AutomaticofRemote DetectionSensor

No

To view Outside or Duct temperature

press and hold Mode 2 seconds, rain.

The thermostat will not control to Outside or Duct Sensors.

Outsi@

Press

MODE O

OVERRIDE O

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 the Mode button. While holding the Mode but-

ton, simultaneously press the Up and Down but-

tons. Locked will appear on the display.

Press	all 3 for	_)	Locked
Keypad	Lockout	_	"--_

Press the Mode button, While holding the Mode, press the Override button leave the Setup screens.

ffno buttons are pressed, the display will leave the set screens after 30 seconds.

	Advanced				Setup	Table
STEP NO,		DESCRIPTION				RANGE		FACTORY
								DEFAULT
1	Time of day clock set					24 hour		12:00 Am
2	Day of the		week			Su - Sa		Mo
3	Fan Mode					Auto	/ d	Auto
4	Heat Pump		On or Off			Off/On		Off
5	Deadband		or Temperature swing			1 -	6	2
6	Forced minimum difference					0 -	6	2
	heat/coot
7	Cycles per		hour			d, dl,	2 - 6	6
8	Security	Levets				0 - 3		0
9	Maximum	allowable		Heat set point		35- 99 F		80 F
10	Minimum	allowable		Coot	set point	35 - 99 F		65 F
11	Fahrenheit		or Centrigrade			F /	C	F
12	Thermogtow		TM Backlight			Off /	On	On
13	Fan Purge		timer			0:00 - 3:00		0:00
14	Soft Start					0 - 99		0
15	Remote	Sensor				Yes / No		No

To unlockthe buttons, again press and hold the Mode button. While holding the Mode button, simul- taneously press the Up and Down buttons. Locked will disappear from the display.

DRY CONTACT SWITCH -- The terminals are 'normally open'.Closing or completing the circuit will cause the thermostat to enter Occupied 1. This feature allows an external device such as a central

time clock, occupancy sensor, or a telephone- activated device to force one or more thermostats

into Occupied 1. For the Dry Contact to work the thermostat 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 Occu-

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

CK1

GND

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