Loading...Hoshizaki KM1900SAH, KM1601SAH3, KM1601SWH3, KM1601SRH3, KM1601SRH Service Manual
...
HoshizakiHoshizaki America, Inc.
“A Superior Degree
of Reliability”
Stackable Crescent Cuber
Models
KM-1301SAH/3, SWH/3, SRH/3 KM-1400SWH-M, SWH3-M KM-1601SAH/3, SWH/3, SRH/3 KM-1900SAH/3, SWH/3, SRH/3 KM-2100SWH3, SRH3 KM-2500SWH3, SRH3 KMH-2000SWH/3, SRH/3
SERVICE MANUAL
www.hoshizaki.com
Number: 73208
Issued: 7-7-2015
Revised: 8-11-2015
WARNING
Only qualified service technicians should install and service the appliance. To obtain the name and phone number of your local Hoshizaki Certified Service
Representative, visit www.hoshizaki.com. No service should be undertaken until the technician has thoroughly read this Service Manual. Failure to service and maintain the appliance in accordance with this manual will adversely affect safety, performance, component life, and warranty coverage and may result in costly water damage. Proper installation is the responsibility of the installer. Product failure or property damage due to improper installation is not covered under warranty.
Hoshizaki provides this manual primarily to assist qualified service technicians in the service of the appliance.
Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, send an e-mail message, or write to the Hoshizaki Technical
Support Department for assistance.
Phone: 1-800-233-1940; (770) 487-2331
Fax: 1-800-843-1056; (770) 487-3360
E-mail: techsupport@hoshizaki.com
HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department
Web Site: www.hoshizaki.com
NOTE: To expedite assistance, all correspondence/communication MUST include the following information:
•Model Number
•Serial Number
•Complete and detailed explanation of the problem.
2
IMPORTANT |
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This manual should be read carefully before the appliance is serviced. Read |
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the warnings and guidelines contained in this manual carefully as they provide |
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essential information for the continued safe use, service, and maintenance of the |
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appliance. Retain this manual for any further reference that may be necessary. |
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CONTENTS |
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Important Safety Information.................................................................................................. |
6 |
I. Construction and Water/Refrigeration Circuit Diagram........................................................ |
8 |
A. KM Construction............................................................................................................ |
8 |
1. Air-Cooled Models (SAH/3)....................................................................................... |
8 |
2. Water-Cooled Models (SWH/3/-M)........................................................................... |
9 |
3. Remote Models (SRH/3)........................................................................................ |
10 |
B. KMH Construction......................................................................................................... |
11 |
1. Water-Cooled Models (SWH/3)................................................................................ |
11 |
2. Remote Models (SRH/3)........................................................................................ |
12 |
C. Bin Control................................................................................................................... |
13 |
1a. Single Thermostatic Bin Control........................................................................... |
13 |
1b. Stacked Thermostatic Bin Control........................................................................ |
13 |
2a. Single Mechanical Bin Control............................................................................. |
14 |
2b. Stacked Mechanical Bin Control.......................................................................... |
14 |
D. Water/Refrigeration Circuit Diagram............................................................................ |
15 |
1. Air-Cooled Models (SAH/3)..................................................................................... |
15 |
2. Water-Cooled Models (SWH/3/-M)......................................................................... |
16 |
3a. Remote Models (SRH/3) Except KM-2500SRH3................................................. |
17 |
3b. Remote Models (SRH3) KM-2500SRH3.............................................................. |
18 |
II. Sequence of Operation and Service Diagnosis................................................................ |
19 |
A. Sequence of Operation Flow Chart............................................................................. |
19 |
1. "E" and "G" Control Board without Harvest Pump Timer Operation........................ |
19 |
2. "G" Control Board with Harvest Pump Timer Operation ........................................ |
20 |
3a. Thermostatic Bin Control Shutdown..................................................................... |
21 |
3b. Mechanical Bin Control Shutdown........................................................................ |
22 |
B. Service Diagnosis........................................................................................................ |
23 |
1. "E" and "G" Control Board without Harvest Pump Timer Diagnosis........................ |
24 |
2. "G" Control Board with Harvest Pump Timer Diagnosis......................................... |
29 |
C. Control Board Check.................................................................................................... |
35 |
D. Bin Control Check........................................................................................................ |
36 |
1. Thermostatic Bin Control Check............................................................................. |
36 |
2. Mechanical Bin Control Check............................................................................... |
37 |
E. Float Switch Check and Cleaning................................................................................ |
39 |
1. Float Switch Check................................................................................................. |
39 |
2. Float Switch Cleaning............................................................................................ |
40 |
F. Thermistor Check......................................................................................................... |
41 |
G. Diagnostic Tables........................................................................................................ |
42 |
3
III. Controls and Adjustments................................................................................................ |
46 |
A. Control Board Layout................................................................................................... |
47 |
1. "E" Control Board ................................................................................................... |
47 |
2. "G" Control Board .................................................................................................. |
48 |
B. LED Lights and Audible Alarm Safeties....................................................................... |
49 |
1. "E" Control Board ................................................................................................... |
49 |
2. "G" Control Board .................................................................................................. |
50 |
C. Settings and Adjustments............................................................................................ |
51 |
1. Default Dip Switch Settings..................................................................................... |
51 |
a) "E" and "G" Control Board without Harvest Pump Timer Operation................. |
51 |
b) "G" Control Board with Harvest Pump Timer Operation................................... |
52 |
c) "G" Control Board S5 Dip Switch...................................................................... |
52 |
2. Harvest Timer (S4 dip switch 1 & 2)....................................................................... |
52 |
3. Pump-Out Timer (S4 dip switch 3 & 4)................................................................... |
53 |
4. Pump-Out Frequency Control (S4 dip switch 5 & 6)............................................... |
54 |
5. Bin Control Selector or Harvest Pump Timer Operation (S4 dip switch 7)............. |
54 |
a) Bin Control Selector: "E" Control Board............................................................. |
54 |
b) Harvest Pump Timer: "G" Control Board........................................................... |
55 |
6. Factory Use (S4 dip switch 8)................................................................................ |
55 |
7. Freeze Timer (S4 dip switch 9 & 10)....................................................................... |
55 |
8. Float Switch Selector (S5 dip switch 1): "G" Control Board.................................... |
56 |
9. Refill Counter (S5 dip switch 2 through 5): "G" Control Board................................ |
56 |
D. Control Switch.............................................................................................................. |
56 |
IV. Refrigeration Circuit and Component Service Information.............................................. |
57 |
A. Refrigeration Circuit Service Information..................................................................... |
57 |
B. Component Service Information.................................................................................. |
60 |
C. Water Regulating Valve Adjustment (water-cooled models)......................................... |
61 |
V. Maintenance..................................................................................................................... |
62 |
VI. Preparing the Icemaker for Periods of Non-Use.............................................................. |
63 |
VII. Disposal......................................................................................................................... |
65 |
VIII. Technical Information.................................................................................................... |
66 |
A. Specification and Performance Data........................................................................... |
66 |
1. KM-1301SAH.......................................................................................................... |
66 |
2. KM-1301SAH3........................................................................................................ |
67 |
3. KM-1301SWH ....................................................................................................... |
68 |
4. KM-1301SWH3 ..................................................................................................... |
69 |
5. KM-1301SRH with URC-14F.................................................................................. |
70 |
6. KM-1301SRH3 with URC-14F................................................................................ |
71 |
7. KM-1400SWH-M..................................................................................................... |
72 |
8. KM-1400SWH3-M.................................................................................................. |
73 |
9. KM-1601SAH........................................................................................................... |
74 |
10. KM-1601SAH3...................................................................................................... |
75 |
11. KM-1601SWH....................................................................................................... |
76 |
12. KM-1601SWH3..................................................................................................... |
77 |
13. KM-1601SRH with URC-21F Auxiliary Codes: R-0, R-1, and some S-1.............. |
78 |
14. KM-1601SRH with URC-21F Auxiliary Codes: some S-1 and S-2 and Later....... |
79 |
15. KM-1601SRH with URC-22F Auxiliary Codes: S-2 and Later.............................. |
80 |
4
16. KM-1601SRH3 with URC-21F Auxiliary Codes: R-0, R-1, and some S-1............ |
81 |
17. KM-1601SRH3 with URC-21F Auxiliary Codes: some S-1 and S-2 and Later...... |
82 |
18. KM-1601SRH3 with URC-22F Auxiliary Codes: S-2 and Later............................ |
83 |
19. KM-1900SAH....................................................................................................... |
84 |
20. KM-1900SAH3..................................................................................................... |
85 |
21. KM-1900SWH....................................................................................................... |
86 |
22. KM-1900SWH3.................................................................................................... |
87 |
23. KM-1900SRH with URC-21F............................................................................... |
88 |
24. KM-1900SRH with URC-22F............................................................................... |
89 |
25. KM-1900SRH3 with URC-21F............................................................................. |
90 |
26. KM-1900SRH3 with URC-22F............................................................................. |
91 |
27. KM-2100SWH3..................................................................................................... |
92 |
28. KM-2100SRH3 with URC-22F............................................................................. |
93 |
29. KM-2500SWH3.................................................................................................... |
94 |
30. KM-2500SRH3 with URC-23F............................................................................. |
95 |
31. KMH-2000SWH.................................................................................................... |
96 |
32. KMH-2000SWH3................................................................................................. |
97 |
33. KMH-2000SRH with URC-22F............................................................................. |
98 |
34. KMH-2000SRH3 with URC-22F........................................................................... |
99 |
B. Wiring Diagrams........................................................................................................ |
100 |
1. "E" and "G" Control Board Schematics without Harvest Pump Timer Relays ...... |
100 |
a) KM-1601SWH, KM-1601SRH, KM-1900S_H, KMH-2000S_H........................ |
100 |
b) KM-1601SWH3, KM-1601SRH3, KM-1900S_H3, KM-2100S_H3, |
|
KM-2500S_H3, KMH-2000S_H3...................................................................... |
101 |
2. "G" Control Board Schematics with Harvest Pump Timer Relays ........................ |
102 |
a) KM-1301S_H T-0, U-0...................................................................................... |
102 |
b) KM-1301S_H U-1 to D-0.................................................................................. |
103 |
c) KM-1301SAH and KM-1301SWH D-1 to E-1................................................... |
104 |
d) KM-1301SRH D-1 to E-0................................................................................. |
105 |
e) KM-1301SRH E-1 and Later............................................................................ |
106 |
f) KM-1400SWH-M.............................................................................................. |
107 |
g) KM-1601SAH E-0 and Earlier.......................................................................... |
108 |
h) KM-1601SAH E-1 and Later............................................................................ |
109 |
i) KM-1301S_H3 T-0, U-0...................................................................................... |
110 |
j) KM-1301S_H3 U-1 to E-0 and KM-1601SAH3 A-0 to E-0.................................. |
111 |
k) KM-1301S_H3 E-1 and KM-1601SAH3 E-1 and Later...................................... |
112 |
l) KM-1400SWH3-M............................................................................................. |
113 |
5
Important Safety Information
Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, damage to the appliance, or damage to property.
WARNING |
Indicates a hazardous situation which could result in death or |
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serious injury. |
NOTICE |
Indicates a situation which could result in damage to the |
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appliance or property. |
IMPORTANT |
Indicates important information about the use and care of the |
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appliance. |
WARNING
The appliance should be destined only to the use for which it has been expressly conceived. Any other use should be considered improper and therefore dangerous. The manufacturer cannot be held responsible for injury or damage resulting from improper, incorrect, and unreasonable use. Failure to service and maintain the appliance in accordance with this manual will adversely affect safety, performance, component life, and warranty coverage and may result in costly water damage.
To reduce the risk of death, electric shock, serious injury, or fire, follow basic precautions including the following:
•Only qualified service technicians should install and service this appliance.
•The appliance must be installed in accordance with applicable national, state, and local codes and regulations. Failure to meet these code requirements could result in death, electric shock, serious injury, fire, or damage to the appliance.
•Electrical connection must be hard-wired and must meet national, state, and local electrical code requirements. Failure to meet these code requirements could result in death, electric shock, serious injury, fire, or damage.
•The icemaker requires an independent power supply of proper capacity. See the nameplate for electrical specifications. Failure to use an independent power supply
of proper capacity can result in a tripped breaker, blown fuse, damage to existing wiring, or component failure. This could lead to heat generation or fire.
•THE ICEMAKER MUST BE GROUNDED. Failure to properly ground the icemaker could result in death or serious injury.
•To reduce the risk of electric shock, do not touch the control switch with damp hands.
•Move the control switch to the "OFF" position and turn off the power supply before servicing. Lockout/Tagout to prevent the power supply from being turned back on inadvertently.
•Do not make any alterations to the appliance. Alterations could result in electric shock, serious injury, fire, or damage.
6
WARNING, continued
•The appliance is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
•Children should be properly supervised around the appliance.
•Do not climb, stand, or hang on the appliance or allow children or animals to do so. Serious injury could occur or the appliance could be damaged.
•Do not use combustible spray or place volatile or flammable substances near the appliance. They might catch fire.
•Keep the area around the appliance clean. Dirt, dust, or insects in the appliance could cause harm to individuals or damage to the appliance.
Additional Warning for Remote Models
•THE REMOTE CONDENSER UNIT MUST BE GROUNDED. The power supply and ground connection to the remote condenser unit are supplied from the icemaker. Failure to properly ground the remote condenser unit could result in death or serious injury.
•Wire routing (conduit) and disconnect (if required) must meet national, state, and local electrical code requirements. Failure to meet these code requirements could result in death, electric shock, serious injury, fire, or damage.
•Move the icemaker control switch to the "OFF" position and turn off the power supply to the icemaker before servicing the remote condenser unit. Lockout/Tagout to prevent the power supply from being turned back on inadvertently.
NOTICE
•Follow the instructions in this manual carefully to reduce the risk of costly water damage.
•In areas where water damage is a concern, install in a contained area with a floor drain.
•Install the appliance in a location that stays above freezing. Normal operating ambient temperature must be within 45°F to 100°F (7°C to 38°C).
•Do not leave the appliance on during extended periods of non-use, extended absences, or in sub-freezing temperatures. To properly prepare the appliance for these occasions, follow the instructions in "VI. Preparing the Icemaker for Periods of
Non-Use."
•Do not place objects on top of the appliance.
•The dispenser unit/ice storage bin is for ice use only. Do not store anything else in the dispenser unit/ice storage bin.
7
I. Construction and Water/Refrigeration Circuit Diagram
A.KM Construction
1.Air-Cooled Models (SAH/3)
Spray Tubes
Inlet Water Valve
Evaporator Assembly
Cleaning Valve
Check Valve 
(water) 
Water Pump
Float Switch
Compressor
Thermostatic
Bin Control
Low-Side Service Valve
High-Side Service Valve
Thermostatic Expansion Valves
Water Supply Inlet
Junction Box
Hot Gas Valve
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Check Valves |
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(refrigeration) |
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Condenser |
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Control Box |
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Fan Blade |
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Fan Motor |
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Drier |
High-Pressure |
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Switch |
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Liquid Line Valve |
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Control Switch |
Transformer Box (KM-1301SAH |
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Auxiliary Code D-1 and Later and |
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All 3 phase model) |
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Model Shown: KM-1301SAH3
8
2. Water-Cooled Models (SWH/3/-M)
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Spray Tubes |
Low-Side Service Valve |
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Inlet Water Valve |
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High-Side Service Valve |
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Evaporator Assembly |
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Thermostatic |
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Expansion Valves |
Water Supply Inlet
Junction Box
Hot Gas Valve
Check Valves (refrigeration)
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Water-Cooled |
Cleaning Valve |
Condenser |
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Check Valve (water)
Water Pump
Float Switch |
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Water Regulating |
Compressor |
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Valve |
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Bin Control Thermostat |
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Drier |
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Control Box |
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Control Switch |
Liquid Line Valve |
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Transformer Box (KM-1301SWH |
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Auxiliary Code D-1 and Later and |
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All 3 phase model) |
Model Shown: KM-1301SWH3
9
3. Remote Models (SRH/3)
Inlet Water Valve
Evaporator Assembly
Cleaning Valve
Check Valve (water)
Water Pump
Float Switch
Compressor
Bin Control Thermostat
Spray Tubes |
Low-Side Service Valve |
High-Side Service Valve
High-Side Liquid Service Valve
Water Supply Inlet
Hot Gas Valve
Junction Boxes
Check Valves
(refrigeration)
Thermostatic
Expansion Valves
Receiver
Control Box
Access Valve
Drier
Control Switch |
Liquid Line Valve |
Transformer Box (KM-1301SRH
Auxiliary Code D-1 and Later and
All 3 phase model)
Note: KM-2500SRH3 Includes Headmaster (C.P.R.)
Model Shown: KM-1301SRH3
10
B. KMH Construction
1. Water-Cooled Models (SWH/3) |
Inlet Water Valve |
|
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Spray Tubes |
High-Side Service Valve |
Thermostatic
Expansion
Valves
Evaporator Assembly |
Check Valves |
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(refrigeration) |
Cleaning Valve |
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Transformer Box |
Check Valve |
(3 phase model) |
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(water) |
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Water Pump |
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Float Switch |
Control Box |
Low-Side Service Valve |
Control Switch |
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Bin Control Thermostat |
Model Shown: KMH-2000SWH3 |
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High-Pressure Switch |
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Junction Box |
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Water Supply Inlet |
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Hot Gas Valve |
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Water Regulating Valve |
Liquid Line Valve |
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Compressor |
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Drier |
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Model Shown: KMH-2000SWH3 |
Water-Cooled Condenser |
11
2. Remote Models (SRH/3)
Spray Tubes |
Inlet Water Valve |
Thermostatic
Expansion
Valves
Evaporator Assembly |
Check Valves |
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(refrigeration) |
||
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High-Side Service Valve |
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Cleaning Valve |
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Check Valve |
Transformer Box |
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(water) |
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(3 phase model) |
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Water Pump |
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Float Switch |
Control Box |
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Low-Side Service Valve |
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Control Switch |
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Bin Control Thermostat |
Model Shown: KMH-2000SRH3
High-Pressure Switch
Junction Box
Water Supply Inlet
Hot Gas Valve
Liquid Line Valve
Compressor
Drier
Receiver
Model Shown: KMH-2000SRH3
12
C. Bin Control
1a. Single Thermostatic Bin Control
Bin Control Bulb Holder E
Bin Control Bulb Holder F
Bin Control Bulb Holder G
Spacer
Bin Control Bulb Holder C
Bin Control |
Silicone Hose |
Extension Bracket |
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Bin Control Bulb Holder |
Z Bracket Used for Hoshizaki
B-1300, B-1500, B-1650, and
Non-Hoshizaki Ice Stoarage
Bin
1b. Stacked Thermostatic Bin Control
Upper Bin Control Bulb Holder
Lower Bin Control Bulb Holder
Bin Control Bulb Holder C
Bin Control
Extension Bracket
Z Bracket Used for Hoshizaki
B-1300, B-1500, B-1650, and
Non-Hoshizaki Ice Stoarage
Bin
Bin Control Bulb Holder E
Bin Control Bulb Holder F
Bin Control Bulb Holder G
Spacer
Silicone Hose
Upper Bin Control Bulb Holder
Lower Bin Control Bulb Holder
13
2a. Single Mechanical Bin Control
Mechanical Bin Control Connection Overview
Wire Harness |
Bin Control Cable Connector to |
Connector B |
Wire Harness Connector A |
(for upper unit) |
Wire Harness |
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Control Board |
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Red K4 Connector |
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Wire Saddle |
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Bin Control |
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Bin Control Bracket |
Cable Bracket |
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Bin Control Cable |
||
Thumbscrews Bin Control Assembly |
Connection Detail
Wire Harness Connector B (for upper unit)
Bin Control |
Wire Harness |
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Connector A |
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Cable Connector |
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Control Board
Red K4 Connector
2b. Stacked Mechanical Bin Control
Upper Unit Connection Overview
Lower Unit Wire Harness Connector B to
Upper Unit Wire Harness Connector A Upper Unit Wire Harness
Connector B (not used)
Upper Unit Connection Detail
Upper Unit Wire Harness
Connector B (not used)
Bin Control 
Cable
Bracket
Control Board
Red K4 Connector
Lower
Unit Wire
Harness
Wire Saddle
Lower Unit Wire Harness Connector B
See "II.D.1. Dispenser
Unit/Ice Storage Bin
and Icemaker Setup" and "II.D.2. Bin Control 
Installation" for the 
Lower Unit Connection 
Upper Unit
Wire Harness 
Connector A
Control Board
Red K4 Connector
Control Board
Red K4 Connector
14
15
Spray Tubes
Water
Tank
Water Supply
Inlet Water Valve
Spray Tubes
Condenser
Evaporator
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Cleaning Valve |
Fan |
Drier |
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Thermistor |
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Liquid Line |
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High-Pressure |
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Valve |
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Switch |
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Heat Exchanger |
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Hot Gas |
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Valve |
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Service Suction Line |
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Valve |
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Strainer |
Check |
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Valves |
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Check Valve |
Float Switch |
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Service |
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Valve |
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Compressor |
Discharge Line |
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Drain |
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Water Pump |
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Thermostatic Expansion Valves |
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Freeze/Harvest Pump-Out |
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Pump Timer |
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Refrigeration Circuit
Water Circuit
(SAH/3) Models Cooled-Air .1 |
Circuit Water/Refrigeration .D |
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Diagram |
16
Spray Tubes
Water
Tank
Water Supply |
Water Regulating Valve |
Inlet Water Valve |
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Condenser |
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Spray Tubes
Evaporator
Cleaning Valve
Thermistor
Drier
Liquid Line
Valve
Heat Exchanger
Suction Line
Service
Valve
Check Valve |
Float Switch |
Service |
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|
Valve |
Drain/Return
Water Supply
High-Pressure
Switch
Hot Gas
Valve
Check
Strainer Valves
Discharge Line
Compressor
Drain
Water Pump |
Thermostatic Expansion Valves |
Freeze/Harvest Pump-Out
Pump Timer
Refrigeration Circuit
Water Circuit
M)-(SWH/3/ Models Cooled-Water .2
17
Spray Tubes
Water
Tank
Inlet Water Valve
Spray Tubes
Evaporator
Check Valve
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Condenser |
KM-2500SRH3: Headmaster |
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Water |
located in icemaker |
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Supply |
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Fan |
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Headmaster |
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Cleaning Valve |
(C.P.R.) |
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Service |
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Drier |
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Valve |
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Thermistor |
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Receiver |
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Liquid Line |
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Fusible Plug |
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Valve |
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High Pressure |
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Heat Exchanger |
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Switch |
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Hot Gas |
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Suction Line |
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Valve |
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Service |
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Valve |
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Check |
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Strainer |
Valves |
Float Switch |
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Service |
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Valve |
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Compressor |
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Discharge Line |
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Drain |
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Water Pump |
Expansion Valves |
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Freeze/Harvest Pump-Out
Pump Timer
Refrigeration Circuit
Water Circuit
Headmaster with Unit Condenser |
Except (SRH/3) Models Remote .3a |
(CPR) |
2500SRH3-KM |
18
Condenser
Water
Supply
Spray Tubes |
Fan |
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Service Valve |
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Inlet Water Valve |
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Drier |
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Headmaster |
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Evaporator |
(C.P.R.) |
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Cleaning Valve Liquid Line
Valve
Thermistor
Receiver
Suction Line
Service Valve
Check Valve 
Shut-Off Valve
(Factory Use Only)
High-Pressure
Switch
Fusible Plug
Strainer
Hot Gas
Valve
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Water |
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Service |
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Valve |
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Tank |
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Check |
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Discharge Line |
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Valves |
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Compressor |
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Drain |
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Freeze |
Pump-Out |
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Water Pump |
Float Switch |
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Expansion Valves |
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Refrigeration Circuit
Water Circuit
2500SRH3-KM (SRH3) Models Remote .3b (CPR) Headmaster without Unit Condenser
"E" and "G" Control Board without Harvest Pump Timer Operation Flow Chart
Cycle |
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1. 1-Minute |
2. Harvest Cycle |
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3. Freeze Cycle |
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4. Pump-Out Cycle |
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Steps |
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Fill Cycle |
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• Max. WV time: 6 min. |
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• Min. freeze time: 5 min. |
• Factory set for every |
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• Max. harvest time: 20 min. |
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• Max. freeze time: freeze timer |
10th cycle |
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setting |
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(S4 dip switch 5 & 6) |
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(S4 dip switch 9 & 10) |
• Pump motor stops for |
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Thermistor |
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1 to 3-min. harvest |
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5-min. timer in |
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2 sec., then reverses |
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in control |
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timer in control |
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control |
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FS in control |
for 10/20 sec. (S4 dip |
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switch 3 & 4) |
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Startup |
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(S4 dip switch 1 & 2) |
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FS check |
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FS closed |
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FS check |
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FS closed |
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FS opens or |
Comp continues |
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WV energized |
Comp energized |
Thermistor temperature |
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Comp continues |
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freeze timer |
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FMR energized |
reaches 48°F (9°C) |
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FMR continues |
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terminates |
FMR continues |
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FS open |
HGV energized |
(3.9 kΩ or less). Harvest |
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FM energized |
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HGV energized |
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19 |
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timer starts (1 to 3 min.). |
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PM de-energizes for 2 sec., |
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WV energized |
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LLV energized |
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FS open |
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PM energized |
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then reverses for 10/20 sec. |
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If FS is open, Comp stops and cycle returns to 1-min. fill. |
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HGV de-energized |
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FM de-energized |
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LLV de-energized |
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WV de-energized |
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Legend: BC–bin control
Comp–compressor FM–fan motor FMR–fan motor-remote FS–float switch HGV–hot gas valve LLV–liquid line valve PM–pump motor WV–inlet water valve
Components Energized when the Control Switch is in the "WASH" Position
The "WASH" position on the control switch is used when cleaning and sanitizing the icemaker. When in the "WASH" position, power is supplied to the pump motor. With the cleaning valve closed, the cleaner and sanitizer flow over the outside of the evaporator plate assembly. With the cleaning valve open, the cleaner and sanitizer flow over both the outside and the inside of the evaporator plate assembly.
Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the icemaker will not restart when the control switch is placed in the "ICE" position.
Timer Pump Harvest without Board Control "G" and "E" 1. |
Chart Flow Operation of Sequence .A |
Diagnosis Service and Operation of Sequence .II |
Operation |
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20
"G" Control Board with Harvest Pump Timer Operation Flow Chart
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1. 1-Minute |
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Cycle |
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2. Harvest Cycle |
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3. Freeze Cycle |
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4. Pump-Out Cycle |
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Steps |
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Fill Cycle |
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• WV time: 6 min. or the length of harvest minus 50 |
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• Min. freeze time: 5 min. |
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• Factory set for every |
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sec. (S4 dip switch 7), whichever is shorter. Do not |
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• Max. freeze time: freeze timer setting |
10th cycle |
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adjust S4 dip switch 7 out of the factory position. |
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(S4 dip switch 9 & 10) |
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(S4 dip switch 5 & 6) |
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• Max. harvest time: 20 min. |
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• Pump motor stops for |
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2 sec., then reverses |
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Thermistor |
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1 to 3-min. harvest timer in |
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5-min. timer |
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for 10/20 sec. |
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(S4 dip switch 3 & 4) |
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in control |
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control (S4 dip switch 1 & 2) |
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in control |
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FS in control |
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Harvest Pump |
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Timer |
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Startup |
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50 sec. |
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FS check |
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FS closed |
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PM energized |
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FS check |
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FS closed |
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FS opens or |
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WV de-energized |
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Comp continues |
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Comp continues |
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WV energized |
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Comp energized |
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freeze timer |
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Thermistor temperature |
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FMR continues |
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FM continues |
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terminates |
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FMR energized |
reaches 48°F (9°C) |
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HGV energized |
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FS open |
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HGV energized |
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FMR continues |
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(3.9 kΩ or less). |
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PM de-energizes for 2 sec., |
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WV energized |
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PM continues |
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Harvest timer starts. |
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then reverses for 10/20 sec. |
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FS open |
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LLV energized |
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FM de-energized |
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HGV de-energized |
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If FS is open, Comp stops and cycle returns to 1-Min. fill. |
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(FM continues on KM-1601SAH) |
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LLV de-energized
Legend: BC–bin control
Comp–compressor FM–fan motor FMR–fan motor-remote FS–float switch HGV–hot gas valve LLV–liquid line valve PM–pump motor WV–inlet water valve
Components Energized when the Control Switch is in the "WASH" Position
The "WASH" position on the control switch is used when cleaning and sanitizing the unit. When in the "WASH" position, power is supplied to the pump motor. With the cleaning valve closed, the cleaner and sanitizer flow over the outside of the evaporator plate assembly. With the cleaning valve open, the cleaner and sanitizer flow over both the outside and the inside of the evaporator plate assembly.
Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the unit will not restart when the control switch is placed in the "ICE" position.
Operation Timer Pump Harvest with Board Control "G" .2
21
"E" and "G" Control Board with Thermostatic Bin Control Shutdown Sequence Flow Chart
Shutdown |
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1. Bin Full |
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2. Icemaker Off |
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3. Ice Level Lowered |
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and Restart |
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Within 10 sec. after ice contacts |
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All components |
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No ice touching TBC bulb. |
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TBC bulb, icemaker shuts down. |
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de-energized. |
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Icemaker starts at |
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"1. 1-Minute Fill Cycle." |
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TBC |
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To 1. 1-Minute Fill Cycle |
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Ice contacts TBC bulb |
TBC open |
TBC closed |
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de-energized |
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NOTE: "G" control board green "BC CLOSED" LED on continuously when the K4 jumper is in place.
Shutdown Control Bin Thermostatic .3a
Legend: BC–bin control
TBC–themostatic bin control
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"G" Control Board Mechanical Bin Control Shutdown Sequence Flow Chart
Shutdown 
and Restart
MBC
Operation 
1.Bin Full Shutdown Delay:
•Fill Cycle–15 sec. after activation.
•Harvest Cycle–At the end of the harvest cycle, or up
to 15 sec. into the freeze cycle if activated at the end of the harvest cycle.
• Freeze Cycle– 15 sec. after activation if activated at least 15 sec. before the 5-min. short cycle protection timer terminates.
Otherwise, at the end of the next harvest cycle.
2. Icemaker Off |
3. Ice Level Lowered |
All components |
Icemaker starts at |
de-energized. |
"1. 1-Minute Fill Cycle." |
To 1. 1-Minute Fill Cycle
MBC open (MBC actuator paddle engaged) Green "BC CLOSED" LED off
Yellow "BC OPEN" LED on
Legend:
BC–bin control
MBC–mechanical bin control
Yellow "BC OPEN" LED continues. All components de energized.
MBC closed
(MBC actuator paddle disengaged) Green "BC CLOSED" LED on Yellow "BC OPEN" LED off
Shutdown Control Bin Mechanical .3b
B. Service Diagnosis
WARNING
•The appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire.
•Risk of electric shock. Control switch in "OFF" position does not de energize all loads Use extreme caution and exercise safe electrical practices.
•Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.
•Before servicing the appliance, move the control switch to the "OFF" position and turn off the power supply.
•CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after the appliance is serviced. Make sure that none have fallen into the dispenser unit/ice storage bin.
•Make sure all food zones in the appliance and dispenser unit/ice storage bin are clean after service.
The diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components. Before proceeding, check for correct installation, proper voltage per nameplate, and adequate water supply. Check CB using the steps in "II.C. Control
Board Check." Check dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, 10 and S5 dip switch 1 through 5 ("G" CB) are in the factory default position. S4 dip switch 1, 2, 5, 6 are cleaning adjustments and the settings are flexible. For factory default settings, see "III.C.1. Default Dip Switch Settings."
Note: • When checking high voltage (115VAC), always choose a white (W) neutral wire to establish a good neutral connection.
•On models with a main transformer, the neutral (W) is provided through MT.
To confirm a good neutral, check for 60VAC from white (W) neutral to ground (GND). If 60VAC is present, neutral is good. If 60VAC is not present, check 208-230VAC main power supply to MT. If 208-230VAC is present, check MT continuity.
•When checking voltage from the CB K1 connector (10 pin connector), pull CB K1 connector out slightly to allow room for multimeter test leads contact.
1)Turn off the power supply, then access the control box. Move the control switch to the "OFF" position. Clear any ice from TBC.
2)Check that BC is closed and the 115VAC 10A fuse is good.
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1."E" and "G" Control Board without Harvest Pump Timer Diagnosis
3)Power On: Turn on the power supply, then move the control switch to the "ICE" position.
A 5 sec. delay occurs.
•"E" Control Board: CB red "POWER OK" LED turns on.
•"G" Control Board: CB red "POWER OK" LED and green "BC CLOSED" LED turn on.
Note: • CB red "POWER" LED remains on unless the 10.5VAC power supply is interrupted (K2 connector).
•Check CB using the steps in "II.C. Control Board Check."
•"G" CB: If yellow "BC OPEN" LED is on, check that CB red K4 jumper is in place.
a)Power On Diagnosis: If CB red "POWER OK" LED is off, confirm closed TBC and 10A fuse is good. If TBC is open, remove ice from bulb and warm bulb in hand.
If TBC does not close, replace TBC. See "II.D. Bin Control Check." Check for 115VAC at control switch #1 (BK) to neutral (W) then at control switch #2 (P) to neutral (W).
If 115VAC is present on control switch #1 (BK) and not on control switch #2 (P), replace control switch. If 115VAC is present on control switch #2 (P), check for 115VAC at HPS (P) to neutral (W), then HPS (BK) to neutral (W). If 115VAC is present at HPS (P) and not at HPS (BK), HPS is open. See HPS Diagnosis below. If 115VAC is present at HPS (BK), check for 10.5VAC at CB K2 #1 (R) to CB K2 #2 (R).
If 10.5VAC is not present, confirm that the cleaning valve interlock switch is closed. Next, check CT continuity. If open, replace CT.
b)HPS Diagnosis: Confirm FM is energized and fan blade turns freely. Confirm condenser coil is not dirty. Confirm that the location meets installation requirements. See the appliance's instruction manual for details. Confirm there are no restrictions in the refrigeration circuit.
Harvest Cycle: HGV, strainer, or check valve.
Freeze Cycle: FM, FMR, TXV, HM, LLV, WRV, strainer, check valve, drier, damaged line set or fitting, and fan blade for binding.
Let refrigeration circuit pressures equalize. If HPS does not reset and pressures are equalized, replace HPS. If pressures are not equalized, reclaim refrigerant and diagnose refrigeration circuit restriction.
4)1-Minute Fill Cycle – LED 4 is on. WV energizes. After 1 min., CB checks for a closed FS. If FS is closed, harvest cycle begins. If harvest cycle begins (Comp, HGV, and FMR energize), continue to step 5. If FS is open, WV remains energized through additional 1 min. fill cycles until water enters the water tank and FS closes (low water safety protection during initial start up and at the end of each harvest). Diagnosis: Check
that water enters the water tank. If not, check that the water supply line shut off valve is open and screens or external filters are clear. Check for 115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present, and WV
does not energize, check for 115VAC at WV. If 115VAC is present, check coil continuity. If open, replace WV. If the water tank fills, but the appliance fails to start harvest (Comp energized), check for open FS. See "II.E. Float Switch Check and Cleaning." If FS is closed and CB fails to start the harvest cycle after 1 min., replace CB.
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5)Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV continues. Comp, FMR, and
HGV energize. CB monitors the warming of the evaporator via the thermistor located on the suction line. When the thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). The harvest timer has settings of 60, 90, 120, and 180 sec. The pump out timer (S4 dip switch 3 & 4) acts in place of the harvest timer during cycles with a pump out (S4 dip switch 5 & 6). WV remains energized during harvest for a maximum of 6 min. or the length of harvest, whichever is shorter.
a)Comp Diagnosis: Check that evaporator is warming. If not, confirm that Comp energizes. If not, check for 115VAC at CB K1 #1 (V) or #9 (V) to neutral (W).
If 115VAC is not present, check for 115VAC at CB K1 #7 (BR) or #10 (BR) to neutral
(W). If 115VAC is present at CB #7 (BR) or #10 (BR) and not at CB #1 (V) or #9 (V), replace CB. If 115VAC is present, check for 115VAC at MC solenoid. If 115VAC is present, confirm contacts are closed. If not, replace MC. If MC contacts are closed, check Comp start and run capacitors, Comp start relay, and Comp motor winding.
b)HGV Diagnosis: If Comp is energized and evaporator is not warming, check that HGV energizes and opens. Check for 115VAC at CB K1 #2 (P) to neutral (W).
If 115VAC is not present, replace CB. If 115VAC is present, check for 115VAC at HGV coil and check HGV coil continuity. Replace as needed.
c)LLV Diagnosis: Confirm that LLV is de-energized and closed (not bypassing). If energized, replace CB. If de-energized and bypassing, replace LLV.
d)WRV Diagnosis: Confirm WRV is not leaking by.
e)Initial Harvest Cycle Termination Diagnosis: When the thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). Check discharge line temperature. For a thermistor check, see "II.F. Thermistor Check." If 1-min. fill cycle starts after harvest timer terminates, check that FS is clean and operating properly. See "II.E. Float
Switch Check and Cleaning." If FS is closed, CB proceeds to the next cycle. If not, replace CB.
Note: The min. total time allowed by CB for a complete harvest cycle is 2 min. Max. harvest time allowed is 20 min.
NOTICE! On models with "G" control board and no harvest pump timer relays, S4 dip switch 7 must remain off. Otherwise, PM energizes in reverse direction the last 50 seconds of harvest and empties water from water tank.
6)Freeze Cycle – LED 1 is on. Comp and FMR continue. PM, FM, and LLV energize.
WV and HGV de energize. Appliance is held in freeze by a 5-min. short cycle protection timer. After 5-min. timer terminates and FS opens, freeze cycle terminates.
a)Freeze Cycle Diagnosis: Confirm Comp and FMR continue. Confirm that PM, FM, and LLV energize. Confirm WRV opens. Next, confirm WV and HGV de energize. During the first 5 min. of freeze, confirm evaporator is cooling. If not, confirm
WV de-energized (not leaking by), HGV de-energized (not bypassing), LLV and FM energize, TXV and HM operate correctly, WRV opens, Comp is efficient, and refrigerant charge is correct. See "VIII.A. Specification and Performance Data."
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b)Comp and FMR Diagnosis: If Comp and FMR de-energize once freeze begins, check that appliance has not shut off on HPS ("POWER OK" LED off). If so, check "3)b) HPS Diagnosis" above. If "POWER OK" LED is on, check for 115VAC at CB
K1 #1 (V) or #9 (V) to neutral (W). If 115VAC is not present and LED 1 is on, replace CB. If 115VAC is present, check for 115VAC at CR or MC coil. If 115VAC is present, check CR or MC coil and contact continuity. Replace as needed. If CR or MC is ok, check Comp external overload, start relay, and start and run capacitors. Next, check Comp motor winding continuity. If Comp is energized but evaporator is not cooling, check for an inefficient Comp. See "VIII.A. Specification and Performance Data."
If Comp is energized but FMR is not, check for 115VAC at the FMR junction box.
If 115VAC is not present, check icemaker wiring connections. If 115VAC is present, check for voltage at condenser unit. If 115VAC is not present, check field wiring connections. If 115VAC is present, check FMR capacitor, motor winding, and fan blade for binding.
c)WV and HGV Diagnosis: If WV is energized, check for 115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is present after PM energizes, replace CB. If 115VAC is not present, replace WV (bypassing). If HGV did not de-energize, check for 115VAC at CB K1 #2 (P) to neutral (W). If 115VAC is present after PM energizes, replace CB.
If 115VAC is not present, replace HGV (bypassing).
d)PM Diagnosis: Confirm water is flowing over evaporator from PM and not WV. If PM de-energizes once freeze begins, check for 115VAC at CB K1 #4 (R) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present and PM is de-energized, check for 115VAC at control switch #5 (R) to neutral (W). If 115VAC is present at CB
K1 #4 (R) and not at control switch #5 (R), check control switch continuity between
#5 (R) and #4 (R). Replace as needed. If 115VAC is present at control switch #5 (R) to neutral (W), check PM impeller for binding, PM capacitor, and motor winding continuity.
e)FM and LLV Diagnosis: If FM or LLV does not energize, check for 115VAC at CB
K1 #3 (BK) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present: For FM: check capacitor, motor winding, and blade for binding.
For LLV: check coil voltage and continuity.
f)Refrigerant Pressures, HM, and TXV Diagnosis: If evaporator is still not cooling, check refrigerant pressures. See "VIII.A. Specification and Performance Data." Next, check HM operation. If refrigeration pressures are above HM setpoint and HM is bypassing, replace HM. Check TXV for proper operation. Remove TXV bulb and hold it in your hand, refrigerant low-side pressure should rise, place TXV bulb in
ice water, refrigerant low-side pressure should drop. A 10 to 15 pound pressure swing between warm and cold conditions indicate a good TXV. If a 10 to 15 pound swing is not present, replace TXV.
g)WRV Diagnosis: WRV is factory set and generally no adjustment is required.
If WRV fails to open in freeze, check for proper refrigerant pressures. See "VIII.A. Specification and Performance Data." If refrigerant pressures are correct and WRV does not open, adjust or replace as needed. See "IV.C. Water Regulating Valve Adjustment (water cooled models)."
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h)Freeze Termination Diagnosis: After 5 min. in freeze, disconnect CB K5 FS connector. 15 sec. later appliance should switch out of the freeze cycle (15 second delay after FS opens before terminating the freeze cycle). If appliance remains in freeze longer than 15 sec. after FS removed, replace CB. If appliance switches with FS removed but would previously not switch out of freeze with FS connected (long freeze - 3 beep alarm), see "II.E. Float Switch Check and Cleaning."
Note: Normal freeze cycle will last 20 to 40 min. depending on model and conditions.
Cycle times and pressures should follow performance data provided in this manual. See "VIII.A. Specification and Performance Data."
i)Short Freeze Cycle Diagnosis: Confirm water tank fills and overflows during 1 min. fill and harvest cycles. If not, check water supply filters, shut-off valve, WV screen.
If water tank empties before 5 min. timer terminates and freeze cycle is short, check that CV is not leaking by (water flowing down the potable drain). If CV is leaking by, remove and clean CV, replace rubber seat and spring if necessary. If water tank is full, see "II.E. Float Switch Check and Cleaning" for erratic operating FS.
7)Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out). Timing of the first pump-out is dependent on CB. "E" CB first pump out is after the first freeze cycle. "G" CB first pump-out is determined by S4 dip switch 5 & 6. See the table below.
"E" & "G" Control Board Settings |
1st Pump-Out |
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S4 Dip Switch Setting |
Pump-Out |
"E" Control Board |
"G" Control Board |
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No. 5 |
No. 6 |
Frequency |
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OFF |
OFF |
Every cycle |
After 1st freeze cycle |
After 2nd freeze cycle |
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ON |
OFF |
Every 2 cycles |
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After 3rd freeze cycle |
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OFF |
ON |
Every 5 cycles |
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After 6th freeze cycle |
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ON |
ON |
Every 10 cycles |
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After 11th freeze cycle |
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Comp and FMR continue, HGV energizes. If S4 dip switch 3 & 4 are set to 3 off and
4 on, LED 4 turns on and WV energizes. FM and LLV de energize. PM stops for 2 sec., then reverses for 10/20 sec. depending on pump out timer (S4 dip switch 3 & 4) setting.
When the pump out timer terminates, pump out is complete. The pump-out frequency control (S4 dip switch 5 & 6) is factory set, and generally no adjustment is required. However, the pump out frequency control can be set to have a pump out occur every cycle, or every 2, 5, or 10 cycles. For details, see "III.C.4. Pump Out Frequency Control (S4 dip switch 5 & 6)."
Pump-Out Diagnosis: In the freeze cycle before pump-out (see table above), disconnect CB black K5 connector (FS connector) after 5 min. of freeze. Check that PM stops and re-starts and water is flowing down the drain through CV. If PM does not stop and re-start, check that CB LEDs 1, 3, and 2 are on. If not, replace CB. If LEDs 1, 3, and 2 are on and PM does not energize, check for 115VAC at CB K1 #5 (DBU) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present, make sure the drain line is not clogged and that CV is clean and operating properly.
Confirm FM and LLV de-energize. If FM or LLV is energized with LEDs 1, 3, and 2 on, replace CB.
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8)Normal Harvest Cycle – Same as the initial harvest cycle. Return to step 5 above.
Note: Appliance continues to cycle until BC is satisfied or power is turned off. The appliance always restarts at the 1-min. fill cycle.
9)Shutdown: "E" and "G" Control Board
When the appliance is running, hold ice in contact with the thermostatic bulb.
TBC switch opens within 10 sec., shutting down the appliance. TBC is factory set, and generally no adjustment is required. However, adjustment may be needed in some conditions, particularly at higher altitude locations. Diagnosis: See "II.D.
Bin Control Check." NOTICE! Do not adjust S4 dip switch 7 out of the factory default position. This dip switch must be left in the factory default position or the appliance will not operate correctly.
"G" Control Board: CB red K4 connector must have the jumper in place. When the jumper is in place, the green "BC CLOSED" LED remains on. If the jumper is not in place, yellow "BC OPEN" LED turns on and the icemaker turns off and remains off until the jumper is replaced in its original position.
Legend: BC–bin control; CB–control board; CR–compressor relay; CT–control transformer;
Comp–compressor; CV–check valve; FM–fan motor; FMR–fan motor-remote; FS–float switch; HGV–hot gas valve; HM–headmaster (C.P.R.); HPS–high-pressure switch; LLV–liquid line valve; MC–magnetic contactor; MT–main transformer; PM–pump motor; TBC–thermostatic bin control; TXV–thermostatic expansion valve; WRV–water regulating valve; WV–inlet water valve
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2."G" Control Board with Harvest Pump Timer Diagnosis
3)Power On: Turn on the power supply, then move the control switch to the "ICE" position. A 5 sec. delay occurs. CB red "POWER OK" LED and green "BC CLOSED" LED turn
on. If yellow "BC OPEN" LED is on, check CB K4 jumper.
Note: • CB red "POWER OK" LED remains on unless the 10.5VAC power supply is interrupted (K2 connector).
•Check CB using the steps in "II.C. Control Board Check."
•Confirm CB green "BC CLOSED" LED is on. If CB yellow "BC OPEN" LED is on, confirm CB K4 jumper is in place. Otherwise, CB yellow "BC OPEN" LED is on and appliance will not start.
a)Power On Diagnosis: If CB red "POWER OK" LED is off, confirm 10A fuse is good.
Check for 115VAC at control switch #1 (BR or BK) to neutral (W) then at control switch #2 (P) to neutral (W). If 115VAC is present on #1 (BR or BK) and not on
#2 (P), replace control switch. If 115VAC is present on control switch #2 (P), check for 115VAC at HPS (P) to neutral (W) then HPS (BK) to neutral (W). If 115VAC is present at HPS (P) and not at HPS (BK), HPS is open. See HPS Diagnosis below. If 115VAC is present at HPS (BK), check for 10.5VAC at CB K2 #1 red wire to CB K2
#2 red wire. If 10.5VAC is not present, check that the cleaning valve interlock switch is closed. Next, check CT continuity. If open, replace CT.
b)HPS Diagnosis: Confirm FM is energized and fan blade turns freely. Confirm condenser coil is not dirty. Confirm that the location meets installation requirements.
See the appliance's instruction manual for details. Confirm there are no restrictions in the refrigeration circuit.
Harvest Cycle: HGV, strainer, or check valve.
Freeze Cycle: FM, FMR, TXV, HM, LLV, WRV, strainer, check valve, drier, damaged line set or fitting, and fan blade for binding.
Let refrigeration circuit pressures equalize. If HPS does not reset and pressures are equalized, replace HPS. If pressures are not equalized, reclaim refrigerant and diagnose refrigeration circuit restriction.
4)1-Min. Fill Cycle – LED 4 is on. WV and X11 relay energize. After 1 min., CB checks for a closed FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp, HGV, FMR energized), continue to step 5a. If FS is open, WV remains energized through additional 1-min. fill cycles until water enters the water tank and FS closes
(low water safety protection during initial start up and at the end of each harvest).
Diagnosis: Check that water enters the water tank. If not, check that the water supply
line shut-off valve is open and screens or external filters are clear. Check for 115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present, and WV does not energize, check for 115VAC at WV. If 115VAC is present,
check coil continuity. If open, replace WV. If the water tank fills, but the appliance fails to start harvest (Comp energized), check for open FS. See "II.E. Float Switch Check and Cleaning." If FS is closed and CB fails to start the harvest cycle after 1 min., replace
CB.
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5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp,
FMR, HGV, and X10 relay energize. CB monitors the warming of the evaporator via the thermistor located on the suction line. When the thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). The harvest timer has settings of 60, 90, 120, and 180 sec. The pump out timer (S4 dip switch 3 & 4) acts in place of the harvest timer during cycles with a pump-out (S4 dip switch 5 & 6). WV and X11 relay are energized during harvest for a maximum of 6 min. or the length of harvest minus 50 sec., whichever is shorter. 50 sec. before harvest terminates, PM energizes. See step 5b below.
a)Comp Diagnosis: Check that evaporator is warming. If not, confirm that Comp energizes. If not, check for 115VAC at CB K1 #1 (V) or #9 (V) to neutral (W).
If 115VAC is not present, check for 115VAC at CB K1 #7 (BR) or #10 (BR) to neutral
(W). If 115VAC is present at #7 (BR) or #10 (BR) and not at #1 (V) or #9 (V), replace CB. If 115VAC is present, check for 115VAC at CR or MC solenoid. If 115VAC is present, confirm contacts are closed. If not, replace CR or MC. If CR or MC contacts are closed, check Comp external overload, Comp start and run capacitors, Comp start relay, and Comp motor winding. If Comp is energized and evaporator is not warming, check that HGV energizes and opens. Check for 115VAC at CB K1 #2 (P) to a neutral (W). If 115VAC is not present and LED 2 is on, replace CB. If 115VAC is present, check coil voltage and continuity. Replace as needed. Confirm that LLV is de-energized and closed (not bypassing). If energized, replace CB. If de-energized and bypassing, replace LLV. Confirm WRV is not leaking by. If evaporator is warming, PM energizes for the last 50 sec. of harvest.
b)HGV Diagnosis: If Comp is energized and evaporator is not warming, check that HGV energizes and opens. Check for 115VAC at CB K1 #2 (P) to neutral (W).
If 115VAC is not present, replace CB. If 115VAC is present, check for 115VAC at HGV coil and check HGV coil continuity. Replace as needed.
c)LLV Diagnosis: Confirm that LLV is de-energized and closed (not bypassing). If energized, replace CB. If de-energized and bypassing, replace LLV.
d)WRV Diagnosis: Confirm WRV is not leaking by.
5b) Harvest Pump Timer – LEDs 1, 3, and 2 are on. When the thermistor reaches 48°F
(9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). 50 sec. before the harvest timer terminates, LED
3 turns on and PM energizes. Comp, FMR, HGV, and X10 relay continue. LED 4 turns off, WV and X11 relay de energize.
Diagnosis: Place a thermometer on the suction line next to the thermistor. Has it warmed to 48°F (9°C) or warmer? Confirm thermistor status. See "II.F. Thermistor
Check." If the thermistor reading is in proper range, dip switch 7 is on, and PM does not energize 50 sec. before harvest terminates, replace CB. If WV continues, check for 115VAC at CB K1 #6 (O). If 115VAC is present, and LED 4 is off, replace CB. If LED 3 is on and PM is not energized, check for 115VAC at CB K1 #5 (DBU). If 115VAC is not present, replace CB. If 115VAC is present and PM is not energized, check for 115VAC at X10 relay terminal #7 (Y) to neutral (W). If 115VAC is not present, check for 115VAC at X10 relay terminal #3 (P) to neutral (W) and X10 relay terminal #5 (Y) to neutral (W).
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