Specifications

Part Number STH025 2/14 15
Component Check Procedures
Electrical Components . . . . . . . . . . . . . . . 161
Control Board, Display board and Touch
Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Control Board Relay Test . . . . . . . . . . 164
Programming A Replacement Control Board
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Main Fuse . . . . . . . . . . . . . . . . . . . . . . 167
Bin Switch . . . . . . . . . . . . . . . . . . . . . . 168
Water Level Control Circuitry . . . . . . . 171
Ice Thickness Probe (Initiates Harvest) 177
High Pressure Cutout (HPCO) Control 182
Fan Cycle Control . . . . . . . . . . . . . . . . 185
Thermistors . . . . . . . . . . . . . . . . . . . . . 186
Harvest Assist Air Pump . . . . . . . . . . . 189
Compressor Electrical Diagnostics . . . 190
Diagnosing Start Components . . . . . . 192
Refrigeration Components . . . . . . . . . . . 195
Head Pressure Control Valve . . . . . . . 195
Harvest Pressure Regulating (HPR) System
Remote Condenser Only . . . . . . . . . . . 199
Water Regulating Valve . . . . . . . . . . . 202
Refrigerant Recovery/Evacuation . . . . . . 203
Self-Contained Model Procedure . . . . 203
Remote Condenser Model Procedure . 207
System Contamination Clean-Up . . . . . . 213
Determining Severity Of Contamination 213
Cleanup Procedure . . . . . . . . . . . . . . . 215
Replacing Pressure Controls Without Re-
moving Refrigerant Charge . . . . . . . . . 218
Liquid Line Filter-Driers . . . . . . . . . . . . 219
Total System Refrigerant Charge . . . . 220