Cornelius MJ30-4 PB, MJ32-4 PB, MJ32-4 PC, MJ30-4 PC, MJ31-4 PB, MJ31-4 PC service manual Out Too Low

Troubleshooting Guide

Problem	Probable Cause	Remedy
DISPENSER IS BRIXING	Low viscosity or highly	Locate the pump switches grouped
OUT TOO HIGH. (Cont.)	concentrated concentrate.	behind the front splash panel. They
	Example 11 to 1 ratio.	are marked SPEED SWITCH with
		the corresponding valve number.
		Placing the switch in the low position
		slows down the concentrate pumping
		rate requiring less water to brix.
DISPENSER IS BRIXING	Supply water pressure is too	Water pressure has a high limit of
OUT TOO LOW.	high.	100 psi/ 7 bar or over. Place regulator
		in supply line to bring pressure down
		to 4 bar/ 50 psi flowing.
	Defective or improperly	High water pressure will cause the
	regulating flow control .	flow control not to regulate properly.
		If the problem exists after the
		pressure has been reduced to 50 psig/
		4 bar, the flow control maybe
		defective.. Disassemble and check the
		spool and sleeve function and the
		compensating spring . Replace parts
		as required.
	Speed switch in the low	Pump speed switch is in the low
	position.	position. Move switch to high
		increasing the pumping rate of the
		concentrate.
	Air leak in the concentrate	Check that the concentrate line
	suction line.	connection is secured tightly to the
		dispenser with the proper gaskets.
		Check the connector at the
		concentrate source to be sure it is
		properly attached.
	Worn concentrate pump	Remove the front half of the
	tubing.	concentrate pump and inspect the
		tubing . Worn or stretched tubing will
		decrease the amount of concentrate
		pumped. After 1 year tubing should
		be replaced.
	Defective poppet valve and or	Disassemble the right side of the
	spring.	valve which contains the syrup
		poppet assembly. Be sure the valve is
		not binding, free of debris, return
		spring is actuating and the diaphragm
		is not torn or punctured.

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