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Trane YSC120H - Page 6

Trane YSC120H
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6 RT-SVX21AC-EN
Table of Contents
Heating Season . . . . . . . . . . . . . . . . . . . . 70
Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . 71
Annual Maintenance . . . . . . . . . . . . . . . . . . 72
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 73
ReliaTel™ Control . . . . . . . . . . . . . . . . . . . . 73
System Status Checkout Procedure . . . . . 73
Method 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Resetting Cooling and Ignition Lockouts 75
Zone Temperature Sensor (ZTS) Service Indi-
cator
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Clogged Filter Switch . . . . . . . . . . . . . . . . 75
Fan Failure Switch . . . . . . . . . . . . . . . . . . 75
Condensate Overflow Switch . . . . . . . . . 75
Zone Temperature Sensor (ZTS) Tests . . 75
Test 1 - Zone Temperature Thermistor
(ZTEMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Test 2 - Cooling Set Point (CSP) and Heating
Set Point (HSP) . . . . . . . . . . . . . . . . . . . . . 75
Test 3 - System Mode and Fan Selection 75
Test 4 - LED Indicator Test, (SYS ON, HEAT,
COOL and SERVICE) . . . . . . . . . . . . . . . . . 76
Relative Humidity Sensor Test . . . . . . . . 76
Programmable and Digital Zone Sensor
Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
ReliaTel™ Refrigeration Module (RTRM) De-
fault Chart . . . . . . . . . . . . . . . . . . . . . . . . . 76
Unit Operation without a Zone Sensor . . 76
Unit Economizer Control (ECA) Troubleshoot-
ing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
ReliaTel™ Control . . . . . . . . . . . . . . . . . . 76
Electromechanical Control . . . . . . . . . . . 77
Unit Economizer Control (ECA) Test Proce-
dures
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Electromechanical Control . . . . . . . . . . . 79
Troubleshooting procedures for Direct Drive
Plenum Fan
. . . . . . . . . . . . . . . . . . . . . . . . . . 79
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . 80
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . 83
Combination Gas Electric Air Conditioner 83
YCD, YCH, YSC and YHC (Parts Only) . . 83
Models Less Than 20 Tons for Commercial
Use* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Table of Contents

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