Manitowoc Ice S1800 service manual Self-Contained Freeze Self-Contained Models

Section 6 Electrical System

4. FREEZE

The water pump starts after the pre- chill. An even flow of water is directed across the evaporator and into each cube cell, where it freezes.

The water fill valve will cycle off then on one more time to refill the water trough.

When sufficient ice has formed, the water flow (not the ice) contacts the ice thickness probes. After approximately 10 seconds of continual contact, a harvest cycle is initiated.

NOTE: The ice machine cannot initiate a harvest cycle until a 6- minute freeze lock has expired.

L1				L2 or N
Ground			Water Valve	(99)
		(20)	(21)
(89)	(55)
		(61)	(22)
High
	Control Board		Harvest Valve
Pressure
	(2)
(88) Cutout		(60)	(77)
	(6)
			(80)
	(5)		Dump Valve	(75)
	(1)		(76)
	(7)		(81)
	(4)	(57)	Water Pump
			(98)
(42)	Trans.	(58)
	Fuse (7a)		Terminates at
			Pin Connection

						(59)
			L2			Contactor Coil
			(25)			(56)
				(26)		Air Compressor
Ice Thickness		(9)				(74)
Probe			(8)
Water Level Probe					Bin Switch
		Low DC		(6)
		Voltage				Clean
		Plug		(1)
						OFF
				(2)		ICE
		(Red)
		Compressor				Run Capacitor
Contactor	Overload	(Yellow)			(46)
						(50)
Contacts
(Black)						(45)
L1
(51)	(85)	(86)			PTCR
				Fan Motor
	Fan Cycle
	Control

Run Capacitor SV3137-5

Self-Contained — Freeze

Table 6-4. Self-Contained Models

4.Freeze (Until 10 Seconds of Water Contact with Ice Thickness Probe)

Toggle Switch

Bin Switch

Control Board Relays

ICE

Closed

#1	Water Pump	ON
#2	Harvest Valve (Left)	OFF
#3	Harvest Valve (Right)	OFF (When Used)
#4	Air Compressor	OFF (When Used)
#5	Water Inlet Valve	Cycles OFF, then ON
		one more time
#6	Water Dump Valve	OFF
#7	Contactor Coil	Closed / ON
#7A	Compressor	ON
#7B	Condenser Fan Motor	May Cycle ON / OFF
Safety Controls (Which could stop ice machine operation)
	High Pressure Cut-Out	Closed
	Main Fuse (On Control Board)	Closed

Part Number 80-1634-3 6-5