Manitowoc Ice S1800 service manual Harvest Sequence, Water Purge

Electrical System Section 6

Harvest Sequence

5. WATER PURGE

The harvest valve(s) opens at the beginning of the water purge to divert hot refrigerant gas into the evaporator.

The water pump continues to run, and the water dump valve energizes for 45 seconds to purge the water in the sump trough. The water fill valve energizes and de-energizes strictly by time. The water fill valve energizes for the last 15 seconds of the 45- second water purge.

After the 45 second water purge, the water fill valve, water pump and dump valve de-energize. (Refer to “Water Purge Adjustment” for details.)

The air compressor (when used) will energize after 35 seconds.

L1				L2 or N
Ground			Water Valve	(99)
		(20)
(89)	(55)		(21)
		(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 SV3137-6

		Self-Contained — Water Purge
Table 6-5. Self-Contained Models
		5. Water Purge (45 Seconds)
Toggle Switch			ICE
Bin Switch			Closed
Control Board Relays
#1	Water Pump		ON
#2	Harvest Valve (Left)		ON
#3	Harvest Valve (Right)		ON (When Used)
#4	Air Compressor		ON; after 35 seconds
#5	Water Inlet Valve		30 seconds OFF,
			15 seconds ON
#6	Water Dump Valve		ON
#7	Contactor Coil		Closed / ON
#7A	Compressor		ON
#7B	Condenser Fan Motor		OFF; May Cycle ON
Safety Controls (Which could stop ice machine operation)
	High Pressure Cut-Out		Closed
	Main Fuse (On Control Board)		Closed

6-6 Part Number 80-1634-3