Stoelting Endura 131 Service Manual page 62

6.3.16 FREEZER WILL NOT LEAVE PRESENT MODE
CAUSE
Loose or defective touch pad connection. .................... Repair the touch pad connection.
6.3.17 TOUCH PAD LIGHTS DO NOT WORK: FREEZER OPERATES NORMALLY
CAUSE
Touch pad defective ..................................................... Replace touch pad.
Loose or improper connections to the touch pad ......... Check and repair the touch pad connections.
Control logic board is defective .................................... Replace control logic board.
6.3.18 COMPRESSOR DISCHARGE PRESSURE TOO HIGH
CAUSE
Improper freezer air clearance ...................................... Remove airflow restrictions. Maintain adequate clearances.
Freezer located near heat source ................................. Move or direct hot air away from freezer.
Ambient temperature is high ......................................... Same as above.
Freezer discharge air recirculating into
condenser intake .......................................................... Eliminate recirculating using Stoelting top rear air discharge
...................................................................................... plenum.
Dirty condenser and/or filter .......................................... *Clear condenser.
Entering water temperature to water-cooled
Condenser is excessively high ..................................... Determine cause and correct.
Condenser fan and/or fan motor is defective ................ Replace fan and/or fan motor.
Discharge line, condenser tube, or condenser
U-bend restriction (especially in top half of
condenser) .................................................................... *Repair restriction.
Water valve out of adjustment ...................................... Make appropriate adjustment. Refer to Refrigeration Section 4
...................................................................................... Subsection 4.22.
Dirt or restriction on waterside of water-cooled
condenser or connecting water lines ............................ Flush condenser and lines thoroughly.
Refrigerant overcharge ................................................. *Recover charge. Evacuate and recharge per nameplate by
...................................................................................... weight-ounces.
Air or noncondensable gases in refrigeration
system ........................................................................... *Same as above.
6.3.19 COMPRESSOR RUNNING TOO HOT: TRIPS ON OVERLOAD PROTECTOR
CAUSE
Excessively high discharge pressure ............................ Refer to Troubleshooting Subsection 6.3.18.
Suction line insulation loose or missing ........................ Re-insulate suction lines.
Expansion valve setting grossly out of
adjustment .................................................................... *Replace expansion valve.
Expansion valve setting is preset for optimum balance of flow to barrel and hopper-
Internal mechanical trouble in compressor ................... *Replace compressor.
DO NOT ATTEMPT TO ADJUST THE VALVE SETTING.
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