- 3 -
•
It may use fan speed control to adjust the system refrigeration
performance to achieve 8-10
°
F differential between return air and supply
air.
In order to control fan speed properly,
a minimum speed adjustment is required.
Turn main control knob to lowest speed
position, locate the setting (on the side or
front) and adjust minimum speed setting
with screw driver (rotate clockwise to
decrease minimum speed; counter-
clockwise to increase minimum speed).
The fan will run from this preset minimum
speed to full speed.
•
Suction pressure: 30-35 psig
•
Head pressure: 125-150 psig at 70 -90
°
F ambient temperatures
The line sizes and refrigerant charges are listed as follows.
MODEL
REFRIGERATION
LINES
LIQUID
LINE
SUCTION
LINE
DRAIN
LINE
CHARGE
VINO-
1500SSW
<= 50 FT
1/4"
OD
3/8” OD
1/2” OD
R134a/
15 OZ
VINO-
2500SSW
<= 50 FT
1/4"
OD
3/8” OD
1/2” OD
R134a/
19 OZ
NOTES:
•
THE VALVE CONNECTION SIZES OF CONDENSING UNIT AND THE LINE
CONNECTION SIZES OF EVAPORATOR UNIT ARE NOT NECESSARY
THE SAME AS THE ABOVE SPECIFIED LINE SIZES.
•
IF THE CONDENSING UNIT IS INSTALLED ABOVE THE EVAPORATOR
UNIT, USE THE SUCTION LINE ONE LISTED SIZE SMALLER.
•
EXPANSION AND SOLENOID VALVES ARE INSTALLED ON LIQUID LINE.
6. Pressure, Superheat and Subcooling Readings
CAUTION:
THE VALVES MUST BE IN THE MIDDLE POSITIONS TO READ PROPERLY.
Complaint Possible
Causes
a. High suction pressure and low head pressure
b. High suction pressure and low head pressure
Low superheat and low subcooling
c. High suction pressure and high head pressure
Low superheat and high subcooling
d. High to normal suction pressure and high head pressure
Low subcooling
e. High suction pressure and high head pressure
Low subcooling
f.
High suction pressure and high head pressure
High superheat
a. Compressor may be bad
b. Expansion valve opened, too
much oil
c. Overcharge
d. Non-condensable
gas
e. Air restricted, dirty condenser,
bad condenser fans
f. High room temperature, high
evaporator load
