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Installation
Instructions
DIGITAL
THERMOSTAT
53DFS250-SL
CoolingOnly,Heat Cool,and Heat Pump
o
©
MULTI-STAGE • SEVEN DAY PROGRAMMABLE
B.
Assemble tools:
X
Flat Blade
Screwdriver
Wire Cutter
and Stripper
C. Carefully unpack the thermostat. Save the screws,
bracket, and instructions.
D. Turn off the power to the system at the main fuse
panel. Most systems have a separate breaker for
disconnecting power to the indoor and outdoor
units.
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i'_'II tit:l [_o] _, I _, I <q / [o] _, [ ,.'t
STEP #1 PREPARATION
STEP #2 WIRE CONNECTIONS
SAMPLE
WIRING
DIAGRAMS
STEP #3 TEST OPERATION
ADVANCED
SETUP
ABOUT
ADVANCED
FEATURES
AND OPERATION
TROUBLESHOOTING
CALIBRATION
1
1
2
2
2
3
5
5
I IMPORTANT: Follow Installation Instructions carefully
CAUTION: DISCONNECT POWER TO THE SYS-
TEM BEFORE INSTALLING THE NEW THERMOSTAT,
SERIOUS PERSONAL INJURY MAY RESULT,
This device complies with Part 15 of the FCC rules. Op-
eration 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
interference that may cause undesired operation.
Refer to the chart below, or the wiring diagrams that
follow for thermostat functions and corresponding ther-
mostat connectors.
FUNCTION
Lo Fan
Compressor
Heating
24 v Power
Common
Rev. Valve
Hi Fan
Remote Sensor +5vdc
Remote Sensor Signal
Remote Sensor Ground
Dry Contact Switch 1
Dry Contact Switch 2
Defrost
*Only used with Heat Pump systems.
INSTALL ON THE
NEW THERMOSTAT
CONNECTOR
MARKED
Gt
Y
H2
R
C
O*
G2
RS+5
RS
RS GND
CK1
CK2
H1
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r_|
I"J-'l = 1 ;/-'I-'Y-'I/ [o]_, I
A.
Proper installation of the thermostat will be accom-
plished by following these step by step instructions.
If you are unsure about any of these steps, call a
qualified technician for assistance.
Manufacturer
reserves the right to discontinue, or change at any time, specifications
or designs
without notice and without incurring obligations.
Catalog No. 02-DFC535SI
Printed in U.S.A.
Form 53-5SI
Pg 1
11-05
Replaces:
53-2SI
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