Service Manual

3
CONTENTS
Important Safety Information ................................................................................................. 5
I. Construction and Water/Refrigeration Circuit Diagram ....................................................... 7
A. Construction .................................................................................................................. 7
1. Air-Cooled Models (MAJ) ......................................................................................... 7
2. Water-Cooled Models (MWJ) ................................................................................... 8
3. Remote Models (MRJ/3) .......................................................................................... 9
B. Water/Refrigeration Circuit Diagram ............................................................................ 10
1. Air-Cooled Models (MAJ) ....................................................................................... 10
2. Water-Cooled Models (MWJ) ..................................................................................11
3. Remote Models (MRJ/3) ........................................................................................ 12
II. Sequence of Operation and Service Diagnosis ............................................................... 13
A. Sequence of Operation Flow Chart ............................................................................. 13
B. Service Diagnosis ....................................................................................................... 16
C. Freeze-Time Correction Cycle (90 min.) ..................................................................... 23
D. Control Board Check ................................................................................................... 25
E. Bin Control Check ....................................................................................................... 26
F. Float Switch Check and Cleaning ................................................................................ 27
1. Float Switch Check ................................................................................................ 27
2. Float Switch Cleaning ............................................................................................ 28
G. Thermistor Check ........................................................................................................ 29
H. Control Switch ............................................................................................................. 29
I. Diagnostic Tables .......................................................................................................... 30
J. Freeze-Up Check List .................................................................................................. 34
III. Controls and Adjustments ............................................................................................... 35
A. Control Board Layout .................................................................................................. 36
B. LED Lights and Audible Alarm Safeties ....................................................................... 37
C. Settings and Adjustments ............................................................................................ 38
1. Default Dip Switch Settings .................................................................................... 38
2. Harvest Timer (S4 dip switch 1 & 2) ...................................................................... 39
3. Pump-Out Timer/Harvest Time During Pump-Out (S4 dip switch 3 & 4) ............... 39
4. Pump-Out Frequency Control (S4 dip switch 5) ..................................................... 40
5. Harvest Pump Time (Harvest Assist) (S4 dip switch 6) ......................................... 40
6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 dip switch 7) .. 41
7. Factory Use (S4 dip switch 8)................................................................................. 41
8. Freeze Timer (S4 dip switch 9 & 10) ...................................................................... 42
9. Float Switch Selector (S5 dip switch 1) ................................................................. 42
10. Rell Counter (S5 dip switch 2 and 3) .................................................................. 42
11. Minimum Harvest Time (S5 dip switch 4) ............................................................. 43
12. Anti-Slush (S5 dip switch 5) ................................................................................. 43
D. Control Switch ............................................................................................................. 43
IMPORTANT
This manual should be read carefully before the appliance is serviced. Read
the warnings and guidelines contained in this manual carefully as they provide
essential information for the continued safe use, service, and maintenance of the
appliance. Retain this manual for any further reference that may be necessary.