Service Manual
Table Of Contents
- Important Safety Information
- I. Construction and Water/Refrigeration Circuit Diagram
- II. Sequence of Operation and Service Diagnosis
- III. Controls and Adjustments
- A. Control Board Layout
- B. LED Lights and Audible Alarm Safeties
- C. Settings and Adjustments
- 1. Default Dip Switch Settings
- 2. Harvest Time (S4 dip switch 1 & 2)
- 3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4)
- 4. Pump-Out Frequency Control (S4 dip switch 5)
- 5. Harvest Pump Time (Harvest Assist Duration) (S4 dip switch 6)
- 6. Harvest Pump Time (Harvest Assist) (S4 dip switch 7)
- 7. Factory Use (S4 dip switch 8)
- 8. Freeze Timer (S4 dip switch 9 & 10)
- 9. Float Switch Selector (S5 dip switch 1)
- 10. Refill Counter (S5 dip switch 2 and 3)
- 11. Minimum Harvest Time (S5 dip switch 4)
- 12. Slush Control (S5 dip switch 5)
- IV. Refrigeration Circuit and Component Service Information
- V. Maintenance
- VI. Preparing the Appliance for Periods of Non-Use
- VII. Disposal
- VIII. Technical Information
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2. Harvest Time (S4 dip switch 1 & 2)
The harvest timer starts counting when the thermistor reaches 48°F (9°C) at the
evaporator outlet and the control board reads 3.9 kΩ from the thermistor. The harvest
timer is factory set, and generally no adjustment is required. However, a setting longer
than the factory setting may be advised in cases where the drain provided at harvest
needs to be prolonged for extra cleaning. Note that the pump-out timer (S4 dip switch
3 & 4) acts in place of the harvest timer during cycles with a pump out. For details, see
"III.C.3. Pump-Out Timer (S4 dip switch 3& 4)."
Note: On models with a pump-out every cycle, the harvest timer is only relevant during
the initial harvest cycle since a pump out occurs every cycle thereafter.
S4 Dip Switch Setting
Time
(sec.)
No. 1 No. 2 S5-4 OFF S5-4 ON
OFF OFF 60 30
ON OFF 90 45
OFF ON 120 60
ON ON 180 75
3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4)
NOTICE
Do not adjust 3 off and 4 on. Pump motor does not run in pump-out rotation in this
setting.
When a pump-out is called for, the pump motor stops for 2 sec., then energizes in the
reverse direction, taking water from the bottom of the water tank and forcing pressure
against the check valve seat allowing water to go through the check valve and down
the drain. At the same time, water ows through the small tube to power ush the oat
switch. The pump motor drains the water tank for the time determined by the pump-out
timer. The pump-out timer also acts in place of the harvest timer during cycles with a
pump-out. The pump-out timer is factory set, and generally no adjustment is required.
However, where water quality is bad and the icemaker needs a longer pump-out time, the
pump-out timer can be adjusted. The pump-out time can be set to pump-out for 10or 20
sec. During pump-out cycles minimum harvest time is based on times given in the table
below.
S4 Dip Switch Setting Time (sec.)
Inlet Water
Valve
No. 3 No. 4
T1 T2
S5-4 OFF S5-4 ON S5-4 OFF S5-4 ON
OFF OFF 10 150 100 Closed Closed
ON OFF 10 180 130 Closed Closed
OFF ON 10 120 70 Open Closed
ON ON 20 180 180 Closed Closed
T1: Time to drain the water tank
T2: Harvest timer at pump out