Service Manual

3
CONTENTS
Important Safety Information ................................................................................................. 5
I. Construction and Water/Refrigeration Circuit Diagram ....................................................... 7
A. KMH Construction ......................................................................................................... 7
1. Water-Cooled Models (SWJ3) .................................................................................. 7
2. Remote Models (SRJ/3) .......................................................................................... 8
B. Bin Control .................................................................................................................... 9
1a. Single Thermostatic Bin Control ............................................................................ 9
1b. Stacked Thermostatic Bin Control ......................................................................... 9
C. Water/Refrigeration Circuit Diagram ............................................................................ 10
1. Water-Cooled Models (SWJ3) ................................................................................ 10
2. Remote Models (SRJ/3) .........................................................................................11
II. Sequence of Operation and Service Diagnosis ............................................................... 12
A. Sequence of Operation Flow Chart ............................................................................. 12
1. Operation Flow Chart ............................................................................................ 12
2. Shutdown Flow Chart ............................................................................................ 13
3. Freeze-Time Correction Chart ............................................................................... 14
B. Service Diagnosis ....................................................................................................... 15
C. Freeze-Time Correction Cycle (90 min.) ..................................................................... 22
D. Control Board Check ................................................................................................... 24
E. Bin Control Check ....................................................................................................... 25
1a. Single Thermostatic Bin Control Layout .............................................................. 26
1b. Stacked Thermostatic Bin Control Layout ............................................................ 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
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.