S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
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Section 6 Electrical System<br />
Energized Parts Charts<br />
SELF-CONTAINED WATER-COOLED MODELS<br />
<strong>Ice</strong> Making<br />
Sequence Of<br />
Operation<br />
START-UP 1<br />
1. Water Purge<br />
2. Refrigeration<br />
System Start-Up<br />
FREEZE<br />
SEQUENCE<br />
3. Pre-Chill<br />
1. Initial Start-Up or Start-Up After Automatic Shut-Off<br />
* Not Used on all <strong>Model</strong>s<br />
On<br />
(when<br />
used)<br />
Condenser Fan Motor<br />
The fan motor is wired through a fan cycle pressure control, therefore,<br />
it may cycle on and off.<br />
Harvest Water Purge<br />
The circuit board has an adjustable water purge in the harvest cycle.<br />
This permits a 0 or 45 second purge cycle.<br />
Auto Shut-Off<br />
The ice machine remains off for 3 minutes before it can automatically<br />
restart. The ice machine restarts (steps 1-2) immediately after the<br />
delay period, if the bin switch re-closes prior to 3 minutes.<br />
Section 6<br />
Electrical System<br />
Control Board Relays Contactor<br />
1<br />
Water<br />
Pump<br />
2<br />
Harvest<br />
Valve<br />
(Left)<br />
3<br />
Harvest<br />
Valve<br />
(Right)*<br />
4<br />
Air<br />
Comp.*<br />
35 sec.<br />
Off<br />
5<br />
Water<br />
Inlet<br />
Valve<br />
6<br />
Dump<br />
Valve<br />
7<br />
Contactor<br />
Coil<br />
7A<br />
Comp.<br />
7B<br />
Cond.<br />
Fan<br />
Motor<br />
Length<br />
Of Time<br />
On On<br />
Off On Off Off Off 45 Seconds<br />
10 sec.<br />
On<br />
Off On Off Off On Off On On Off 5 Seconds<br />
Off Off Off Off<br />
May<br />
Cycle<br />
On/Off<br />
during<br />
the first<br />
45 sec.<br />
Off On On<br />
4. Freeze On Off Off Off<br />
Cycles<br />
Off, then<br />
On one<br />
more<br />
time<br />
Off On On<br />
HARVEST<br />
SEQUENCE<br />
5. Water Purge<br />
On On On<br />
On; after<br />
35 sec.<br />
30 sec.<br />
Off,<br />
15 sec.<br />
On<br />
On On On<br />
6. Harvest Off On On On Off Off On On<br />
7. AUTOMATIC<br />
SHUT-OFF<br />
May Cycle<br />
On/Off<br />
May Cycle<br />
On/Off<br />
May Cycle<br />
On/Off<br />
May Cycle<br />
On/Off<br />
Off Off Off Off Off Off Off Off Off<br />
Initial Start-Up<br />
is 60 Seconds<br />
30 Seconds<br />
thereafter<br />
Until 10 sec.<br />
water contact<br />
with ice<br />
thickness<br />
probe<br />
Factory-set at<br />
45 Seconds<br />
Bin switch<br />
activation<br />
Until bin<br />
switch<br />
re-closes &<br />
3 min. delay<br />
Safety Timers<br />
The control board has the following non-adjustable safety timers:<br />
• The ice machine is locked into the freeze cycle for 6 minutes,<br />
before a harvest sequence can be initiated. The freeze lock is<br />
bypassed when the toggle switch is moved from the OFF to ICE<br />
position on the first cycle only.<br />
• The maximum freeze time is 60 minutes, at which time the control<br />
board automatically initiates a harvest sequence (steps 5-6).<br />
• The maximum harvest time is 3-1/2 minutes, at which time the<br />
control board automatically terminates the harvest sequence. If<br />
the bin switch is open, the ice machine will go to automatic shut-off<br />
(step 7). If the bin switch is closed, the ice machine will go to the<br />
freeze sequence (steps 3-4).<br />
Part Number 80-1634-3 6-1
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