Vinotemp VINO4500DS, VINO6500DS, VINO8500DS manual Service Guide, Refrigeration Piping and Charge

Service Guide

1. Refrigeration Piping and Charge

•The subcooling at the condensing unit shall be around 10°F. The charge may be complete when there are no more bubbles forming in the sight glass.

•The evaporator’s constant pressure expansion valve is set around 38- 40°F at factory. This pressure setting gives a dew point to maintain the humidity for storing wine.

•The superheat at the evaporator unit shall be around 9-18°F under low and high load at 75°F ambient temperature.

•Low side pressure: 33 psig

•High side pressure: 130 -150 psig at 75 -90 °F ambient temperatures

MODEL	LIQUID	SUCTION	DUCT	DRAIN	CHARGE
	LINE	LINE		LINE
VINO-4500DS	1/4" OD	1/2” OD	8	7/8” OD	R134a/
					26 OZ
VINO-6500DS	1/4" OD	5/8” OD	10	7/8” OD	R134a/
					32 OZ
VINO-8500DS	3/8" OD	5/8” OD	10	7/8” OD	R134a/
					38 OZ

2. 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

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