Vinotemp VINO-1900SS, VINO-1500SS manual Evaporator Unit, Refrigeration Piping and Charging

2. Evaporator Unit

•The WM-15SFC evaporator unit is installed for ceiling mount with the air supply towards horizontally and air return on the bottom.

•The WM-19SFC evaporator unit is installed for wall mount with the air supply towards top and air return on the sides.

•Supply and return air flow from the evaporator unit shall be unobstructed for at least 1 foot.

•There is a gravity drain line so that it can not be installed above the evaporator unit. Otherwise a condensation pump must be used.

3. Refrigeration Piping and Charging

NOTES: ALWAYS USE THE SUPERHEAT AND SUBCOOLING, PRESSURE READINGS TO CHARGE REFRIGERANT PROPERLY, THE LISTED CHARGES ARE FOR REFERENCE ONLY.

•The installation order starts from condensing unit (including the receiver), liquid line filter-drier, moisture-liquid indicator (sight glass), liquid line, evaporator unit (including liquid line solenoid valve and thermostatic expansion valve or automatic expansion valve), returning to suction line and condensing unit.

•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 superheat is set around 8-10 °F for a 10 °F TD system at factory.

•Low side pressure: around 33 psig

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

The line sizes and refrigerant charges are listed as follows.

MODEL	REFRIGERATION	LIQUID	SUCTION
	LINES	LINE	LINE
VINO-1500SS	< 50 FT	1/4"	3/8” OD
		OD
VINO-1900SS	< 50 FT	1/4"	3/8” OD
		OD

DRAIN

LINE

1/2” OD

3/8” OD

CHARGE

R134a/

15OZ R134a/

15OZ

4. Pressure, Superheat and Subcooling Readings

NOTES: THE SERVICE 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

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