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
Tab 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”
WALL
WA
LL
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
!
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