Harvest Timer (S4 Dip Switch 1 & 2); Pump-Out Timer/Harvest Time During Pump-Out (S4 Dip Switch 3 & 4) - Hoshizaki Serenity Series Service Manual

2. Harvest Timer (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. Before changing this setting, contact Hoshizaki
Technical Support at 1-800-233-1940 for recommendations. Keep in mind that setting the
harvest timer to a longer setting decreases 24-hour production. 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.
3. Pump-Out Timer/Harvest Time During Pump-Out (S4 dip switch 3 & 4)
• Do not adjust 3 off and 4 on. Drain valve does not energize in this setting.
When a pump-out is called for, the pump motor stops for 2 sec. After 2 sec. the drain
valve and pump motor energize. Water is removed from the bottom of the water tank
and sent down the drain. The pump-out 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 timer control can be set to
pump-out for 10 or 20 sec.
S4 Dip Switch Setting
No. 3
OFF
ON
OFF
ON
T1: Time to drain the water tank
T2: Harvest timer at pump out
S4 Dip Switch Setting
No. 1
OFF
ON
OFF
ON
Time (sec.)
T1
No. 4 S5-4 OFF S5-4 ON
OFF 10
OFF 10
ON 10
ON 20
Time
(sec.)
No. 2
OFF 60
OFF 90
ON 120
ON 180
NOTICE
T2
S5-4 OFF
150 100
180 130
120 70
180 180
37
Inlet Water
Valve
S5-4 ON
Closed Closed
Closed Closed
Open Closed
Closed Closed