
OPERATION MANUAL
7602-444 Communicating
Service Tool
Heat Controller, Inc. • 1900 Wellworth Ave. • Jackson, MI 49203 • (517)787-2100 • www.heatcontroller.com

TABLE OF CONTENTS
Section Title Page
1.0 Connection 3
2.0 Menu Structure 4
3.0 System Confi guration 4
3.1 Airfl ow Selection 4
3.2 Option Selection 5
3.3 Unit Confi guration 5
3.5 Valve Confi guration 5
4.0 Service Mode 6
4.1 Manual Operation 6
4.2 Control Diagnostics 6
4.3 Dipswitch Confi guration 7
4.4 Fault History 7
4.5 Clear Fault History 9
5.0 Revision History 10

Heat Controller, Inc. 7602-444 SERVICE TOOL Operating Manual
P1
Alarm
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Y1
Y2
W
G
C
R
AL1
R
C
R
NSB
AL2
JW1
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B-
Gnd
A+ 24V
1.0 Connection
The Communicating Service Tool (7602-444) allows install and service technicians to confi gure and diagnose Digital
Communicating Units without installing a digital communicating thermostat.
Using the Service Tool, a technician can ELECTRONICALLY:
1. Confi gure items like: airfl ow, heat pump options and confi guration, unit family, unit size, etc.
AND
2. Diagnose the unit by operating it manually, performing control diagnostics, viewing dip switch confi gurations, or by
viewing fault history and operating conditions when a fault occurred.
The Service Tool connects to the DXM2 board with a 4-Wire Connector as shown below:
DXM2
Board
DXM2
Board
Service tool
connection
3