Vinotemp WM25-85SFCD Pressure, Superheat and Subcooling Readings, Valve Operation, Complaint

5. Pressure, Superheat and Subcooling Readings

NOTES: THE VALVES MUST BE IN THE MIDDLE POSITIONS TO READ PROPERLY.

	Complaint			Possible Causes
a.	High suction pressure and low head pressure	a.	Compressor may be bad
b.	High suction pressure and low head pressure	b.	Expansion valve opened, too
	Low superheat and low subcooling		much oil
c.	High suction pressure and high head pressure	c.	Overcharge
	Low superheat and high subcooling	d.	Non-condensable gas
d.	High to normal suction pressure and high head pressure
	Low subcooling	e.	Air	restricted,			dirty	condenser,
e.	High suction pressure and high head pressure
	Low subcooling		bad condenser fans
f.	High suction pressure and high head pressure	f.	High		room	temperature,			high
	High superheat		evaporator load
g.	Low suction pressure and low head pressure	g.	Undercharge
	High superheat and low subcooling	h.	Liquid		line		restricted		after
h.	Low suction pressure and low to normal head pressure
	High superheat and high subcooling		receiver,			solenoid			valve
			restricted
i.	Low suction pressure and low head pressure	i.	Suction line restricted
	Low subcooling	j.	Air	restricted			at	evaporator,
j.	Low suction pressure and low head pressure
	Low superheat and low subcooling		evaporator iced
k.	Low suction pressure and low to normal head pressure	k.	Evaporator restricted
	High superheat and normal to high subcooling	l.	Expansion valve restricted
l.	Low suction pressure and normal head pressure
	High superheat and normal subcooling	m. Both evaporator and condenser
m. Low suction pressure and high head pressure
	High superheat and high subcooling		restricted
n.	Low suction pressure and high head pressure	n.	Liquid		line	restricted before
	High superheat and high subcooling		receiver
o. low to normal suction pressure and high head pressure		o.	Condenser restricted
	High to normal superheat and high subcooling

6. Valve Operation

SPINDLE BACK POSITION SPINDLE FRONT POSITION SPINDLE MIDDLE POSITION

Fig. 2.1 Valve Operation

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