Specifications

Part Number STH025 02/12 9
Component Check Procedures
Electrical Components . . . . . . . . . . . . . . . 157
Control Board, Display board and Touch
Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Control Board Relay Test . . . . . . . . . . 160
USB Flash Drive Specifications and Format-
ting . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Upgrading Firmware with a Flash Drive or
Transferring Setup Data To Multiple Ma-
chines . . . . . . . . . . . . . . . . . . . . . . . . . 164
Exporting Data to a Flash Drive . . . . . 166
Programming A Replacement Control Board
168
Main Fuse . . . . . . . . . . . . . . . . . . . . . . 170
Bin Switch . . . . . . . . . . . . . . . . . . . . . . 171
Water Level Control Circuitry . . . . . . . 174
Ice Thickness Probe (Harvest Initiation)
178
High Pressure Cutout (HPCO) Control 182
Fan Cycle Control . . . . . . . . . . . . . . . . 185
Thermistors . . . . . . . . . . . . . . . . . . . . . 186
Harvest Assist Air Pump . . . . . . . . . . . 190
Compressor Electrical Diagnostics . . . 191
Diagnosing Start Components . . . . . . 193
Refrigeration Components . . . . . . . . . . . 198
Head Pressure Control Valve . . . . . . . 198
Harvest Pressure Regulating (HPR) System
Remote Condenser Only . . . . . . . . . . . 202
Water Regulating Valve . . . . . . . . . . . 205
Refrigerant Recovery/Evacuation . . . . . . 206
Self-Contained Model Procedure . . . . 206
Remote Condenser Model Procedure . 210