Carrier 53DFS250-FS User manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 02-DFC534SI Printed in U.S.A. Form 53-4SI Pg 1 11-05 Replaces: 53-1SI
Book 1 4
Ta b 3 e 2 f
PROGRAMMABLE
STEP #1 PREPARATION 1
STEP #2 WIRE CONNECTIONS 1
SAMPLE WIRING DIAGRAM 2
STEP #3 TEST OPERATION 2
ADVANCED SETUP 2
ABOUT ADVANCED FEATURES
AND OPERATION 3
TROUBLESHOOTING 4
CALIBRATION 4
This device complies with Part 15 of the FCC rules. Opera-
tion is subject to the following 2 conditions: (1) This device
may not cause harmful interference, and (2) This device
must accept any interference received, including interfer-
ence that may cause undesired operation.
Refer to the chart below, or the wiring diagram that
follows.
*Not applicable for use with Duct-Free Splits heat pump systems.
Table of Contents
IMPORTANT: Follow Installation Instructions carefully.
CAUTION: DISCONNECT POWER TO THE SYS-
TEM BEFORE REMOVING THE OLD THERMOSTAT
AND INSTALLING THE NEW THERMOSTAT. SERIOUS
PERSONAL INJURY COULD RESULT.
STEP #1 PREPARATION
A. Proper installation of the thermostat will be ac-
complished by following these step by step in-
structions. If you are unsure about any of these
steps, call a qualified technician for assistance.
B. Assemble tools and recommended junction box.
For best operation, install the thermostat in a junc-
tion box that is free from drafts that originate in-
side the wall.
C. Carefully unpack the thermostat. Save the screws,
bracket, and instructions.
D. Power to the system should be off for installation
or replacement.
STEP #2 WIRE CONNECTIONS
FUNCTION INSTALL ON THE
CONNECTOR MARKED
Lo Fan G1
Compressor Y
Heating H2
24 v Power R
Common C
Rev. Valve O*
Hi Fan G2
Remote Sensor +5vdc RS+5
Remote Sensor Signal RS
Remote Sensor Ground RS GND
Dry Contact Switch 1 CK1
Dry Contact Switch 2 CK2
Flat Blade
Screwdriver
Wire Cutter
and Stripper
.366”
WAL L
WALL
FLATSTAT
EXTENDS
LESS THAN
3/8" FROM
THE WALL.
Flatstat
in Small
J-Box
Installation Instructions
DIGITAL THERMOSTAT 53DFS250-FS
Heat Cool and Cooling Only
HEAT
AUTO
COOL
!

Page 2
Follow the steps below to complete advanced setup.
Sample Wiring Diagram HEAT-COOL/
COOLING ONLY
STEP #3 TEST OPERATION
A. Turn the power on to the system.
B. Press the Mode button until the HEAT icon
appears on the display. Press the Up or Down but-
tons until the set point temperature is 10 degrees
above room temperature. The unit will turn on.
C. Press the Mode button and the COOL icon ap-
pears on the display. Press the Up or Down but-
tons until the set point temperature is 10 degrees
below room temperature. The unit will turn on.
NOTE: Mostequipment hasatime delaybetween
coolandheat cycles.
Advanced Setup
NOTE: H2 connection is not required for cooling only systems.
RS-GND
RS
RS+V
COMMON
LO FAN
COMPRESSOR
REVERSING
VALVE
HIGH FAN
HEAT
POWER
RH2 G2 O YG1C
8 Conductor 18 gage
unshielded cable from the
thermostat to the equipment.
2 Conductor 18 gage
unshielded cable from the
Time Clock to the Thermostat
Dry Contacts.
3 Conductor 18 gage
unshielded cable from the
thermostat to the remote
sensor.
CK1
GND
RS
RS+5
H2
G2
C
G1
Y
O
R
Adjust the maximum
allowable heat set point
when security is in effect.
(Step 8 only appears
if Step 9 is not 0.)
(35 to 99 F)
Locked
Setup
H EAT
Select the security level:
0=no security in effect
1=set point range limited
2=1+ program on all times
3=2 + prohibits set point
changes
Locked
Setup
Select the cycles per
hour limit.
d=cycles per hour
limit defeated.
d1=d + defeat 5 min.
Compressor lockout.
(d, d1, 2 - 6)
Setup
Adjust the minimum
difference between
cooling and heating
set points.
(0 to 6 F)
Setup
C OOL
H EAT
Adjust the deadband
from 1 to 6 degrees F.
Setup
Adjust the time of day
clock.
Select fan operation,
Fan or Fan Auto.
= Low Speed Fan
= Medium Speed Fan
= High Speed Fan
Select Heat Pump, On or Off.
Select the day of the
week.
On
Off
Am
Setup
Setup
Mo
Fan
AUTO
Setup
OFF
Setup
:
Adjust the time of day
clock.
Select fan operation,
Fan or Fan Auto.
= Low Speed Fan
= Medium Speed Fan
= High Speed Fan
Select the day of the
week.
Am
Setup
Setup
Mo
Fan
AUTO
Setup
:
NOTE:Eachstepnumberi
s
located at the top right corner o
f
the display for easy reference.

Page 3
Advanced Setup Table
•MINIMUMHEAT /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, onpage2 . 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 mode, and will only run if there is a
heating or cooling demand.
•OVERRIDE—PresstheOverridebuttonduringa
programmed, unoccupied period to force the thermo-
stat into the Occupied 1 period, temporarily, up to
4 hours. If the Override button is pressed during an
Occupied period, the thermostat will be forced into
Unoccupied and the occupied period
(1,2 or3) ,it
was forced out of will be turned off, only for that day.
• During Override periods the set points may be adjust-
ed, but they will not be remembered after Override
ends.
• FAN PURGETIMER—When this feature is activated,
the fan will turn on during the Unoccupied period at a
preset amount of time prior to the Occupied 1 period.
This preoccupancy fan purge timer may be set as
instructed in
Step 13 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
the Mode button. While holding the Mode button,
simultaneously press the Up and Down buttons.
Locked will appear on the display.
To
unlock the 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 fea-
ture allows an external device such as a central time
clock, occupancy sensor, or a telephone-activated
device to force one or more thermostats into Occu-
pied 1. For the dry contact to work the thermostat
must be in Program On.
Set Occupied 1toOffforall
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.
Advanced Setup (cont)
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
3FanMode Auto /Auto
4 Heat Pump On or Off Off /On Off
5 Deadband or Temperature swing 1 - 62
6Forced minimum difference
heat/cool 0-62
7Cycles per hour d, d1, 2 - 66
8Security Levels 0 - 3 0
9Maximum allowable Heat set point 35 - 99 F80F
10 Minimum allowable Cool set point 35 - 99 F65F
11 Fahrenheit or Centigrade F /CF
12 Thermoglow™ 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
About Advanced Features and Operation
IMPORTANT: For control of multiple thermostats by
one source, refer to Potential Phasing Problems
(document part no. 88-173) prior to installing.
Setup
ON
Setup
Setup
Setup
Locked
Press
Setup
Outside
Setup
Locked
unoccupied
ON
Setup Cool
Heat
CK1
GND

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 02-DFC534SI Printed in U.S.A. Form 53-4SI Pg 4 11-05 Replaces: 53-1SI
Book 1 4
Ta b 3 e 2 f
Copyright 2005 Carrier Corporation
•HOLIDAYMODE— This feature forces the thermostat
into the Unoccupied period for a preset duration, up to
99 days. The Holiday setup display is entered as
follows:
The thermostat will enter Holiday mode when the
clock passes midnight.
During Holiday mode Unoccupied set points are
enforced.
TheOverridebuttonisactiveduringHolidaymode.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 mode
immediately, enter the Holiday setup screen and
select 0.
• SOFT START — This feature is utilized in multiple
thermostat installations controlled by the dry contact
terminals. Assigning a unique soft start number 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 seconds from the dry con-
tact 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
page3, Step 14, to configure the thermostat
for soft start.
•DUALSETPOINTBEHAVIOR — The adjustable set
point range is: 35 to 99 degrees in Fahrenheit and 7to
35 degrees in Centigrade. WheninthemodesHeator
Cool, this adjustable range is unhampered.
When adjusting any Auto mode, including program-
ming Occupied and Unoccupied set points, 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, page2.
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 mode.
For example: If the Cool set point was set to 80 F while
in the Cool mode and the Heat set point was adjusted
to 70 F while in the Heat mode, upon entering the Auto
mode the Heat and Cool set points would be 80Fand
70F.Both set points would then move up and down
together (in this example spread by 10 degrees), by
pressingtheUporDownbuttons.
To move the Heat and Cool set points closer together,
enter the Cool or Heat mode by pressing the Mode but-
ton, then adjust the set point(s) closer together. Heat is
limited to how close it can come to Cool by Step 6,
page2
.
•REMOTESENSORS (Optional Accessory) —When
connected to terminals RS+5, RS, and GND on the
back of the thermostat, the thermostat will read the tem-
perature from the remote sensor and ignore the tem-
perature sensor inside the thermostat. The thermostat
automatically recognizes when a remote sensor is con-
nected. When reading the temperature from the re-
mote, the degree icon above the room temperature
blinks once a second.
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 al-
ready active, the first button
press will round the runtime to either 2:00 or 4:00.
Subsequent button presses will not wrap around as the
Override button on the thermostat does, so the second
or subsequent button presses 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 450 ft of 22 gage, 300 ft
of 20 gage or 150 ft of 18 gage thermostat wire.
See
theRemote Sensorinstructionsforfurther details.
•FACTORYDEFAULTS — Before restoring factory
defaults, set thermostat to OFF mode. If, for any rea-
son 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 but-
ton for 2 seconds. All icons will appear. Press and hold
intheOverridebuttonuntilFd appears. This resets all
factory settings. To calibrate room temperature,see
the Calibration section below.
CALIBRATION:Every thermostat is calibrated before it
leaves the factory. Under normal circumstances there will
never be a need to recalibrate the thermostat. To accom-
modate s
pecial needs , the thermostat may be recalibrated
following these steps:
1. While holding the Mode button in, press the down
button for 5 seconds. After all the icons in the display
appear, release the buttons.
2. Press the Mode button.
3. Press the up or down buttons until the flashing num-
ber equals the current room temperature.
4. Press the Modebuttontoreturntonormal
operation.
TROUBLESHOOTING
SYMPTOM CAUSE REMEDY
The air conditioning
does not attempt to
turn on.
The compressor timer
lockout may prevent the
air conditioner from turn-
ingonforaperiodoftime.
Consult the Owner’s Manual
in the setup section to
defeat the cycles per hour
and compressor time guard.
The display is
blank.
Lack of proper power. Make sure power is turned
on;confirm 24 vac between
Rand C.
CALIBRATION
1
2
3
Press the Mode button. While holding the Mode button, press
the Up button for 2 seconds to enter the time period program-
ming setup.
The first step on the display prompts for maximum number of
Occupied periods. Ignore this prompt and press the Override
button.
When active, the
display counts
down remaining
days blinking.
Unoccupied also
appears.
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.
Optional
Remote Sensor
O
ptional Sensor
OVER
RIDE
OVER
RIDE