- 7 -
•
Supply and return air flow from the evaporator unit should be unobstructed
for at least 1 foot.
3. Air Sensor
•
The air sensor can be located in the wine room or the return air area, but
not the supply air area.
4. Refrigeration Piping and Charging
•
If equipped with a TXV, the evaporator superheat is set around 8
°
F for a
10
°
F TD system at factory.
•
If equipped with an AXV, the valve is set around 38-40
°
F at factory.
•
The charge may be complete when there are no more bubbles forming in
the sight glass. The subcooling at the condensing unit is around 10
°
F and
the superheat at the evaporator unit is around 8
°
F at 75
°
F ambient
temperature.
•
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), suction line, and returning
to condensing unit.
The line sizes and refrigerant charges are listed as follows.
MODEL
REFRIGERATION
LINES
LIQUID
LINE
SUCTION
LINE
DRAIN
LINE
CHARGE
VINO-
2500SSD
< 50 FT
1/4"
OD
3/8” OD
1/2” OD
R134a/
20 OZ
VINO-
4500SSD
< 50 FT
1/4"
OD
1/2” OD
1/2” OD
R134a/
26 OZ
VINO-
6500SSD
< 50 FT
1/4"
OD
5/8” OD
1/2” OD
R134a/
32 OZ
VINO-
8500SSD
< 50 FT
3/8"
OD
5/8” OD
1/2” OD
R134a/
38 OZ
5. Pressure, Superheat and Subcooling Readings
NOTES: THE VALVES MUST BE IN THE MIDDLE POSITIONS TO READ
PROPERLY.
Low side pressure: 33 psig.
High side pressure: 130 psig at 75
°
F ambient temperature and 150 psig at 90
°
F
ambient temperature.
Complaint Possible
Causes
a. High suction pressure and low head pressure
b. High suction pressure and low head pressure
a. Compressor may be bad
b. Expansion valve opened, too
