Vinotemp 250SCU User Manual

VINO1500-2500SSW

Installer’s Instruction

Federal law requires that WINE-MATE split cooling systems be

installed by an EPA certified refrigeration technician.

WINE-MATE split system is shipped as components and is ready for use only
after a certified refrigeration technician has properly installed, evacuated,
charged and tested the system. Proper installation is critical. Vinotemp can only
warrant the quality of the components. The installation and proper operation of
the system must be warranted by the installer. Installation of the system must be
done in accordance with all state and local building and electrical codes.
The condensing unit and evaporator unit are connected by a liquid line and an
insulated suction line that are supplied by the installer. These lines must be
properly sized for the distance between the two units. After the units and the lines
are installed, the system must be pressure tested. If no leaks are found,
evacuate and charge system. Refrigerant amount will vary depending on the
length of line set.

1. Condensing Unit

• Place the condensing units WM150SCU and
250SCU in a properly ventilated location. If it is not,
heat exhausted by the condensing unit will build up
and the cooling system will not operate properly.

• Condensing unit shall be elevated to avoid possible
flooding and shaded from direct sun. It shall not be
exposed to temperatures higher than 110
low ambient kit available).

• Leave minimum 5 feet clearance for the exhaust side and leave minimum
1 foot clearance for the fresh air intake side.

°F or lower than 50 °F (optional

CAUTION:
DO NOT SWITCH ON THE COMPRESSOR IF THE CONDENSING UNIT IS
EQUIPPED WITH A LOW AMBIENT CONDITION KIT UNTIL THE UNIT HAS
BEEN PLUGGED IN FOR 24 HOURS.

2. Valve Operation (Condensing unit)

BACK POSITION FRONT POSITION MIDDLE POSITION

Fig. 1 ROTALOCK Valve Operation

BACK POSITION FRONT POSITION MIDDLE POSITION

Fig. 2 Base Valve Operation

1 - Process & Manometer; 2 - Receiver/Compressor Suction
3 - Liquid/Suction Line; 4 - Pressure Control

Back Position: Process and manometer port closed for normal operation
Front Position: Connection to liquid or suction line closed
Middle Position: All ports open for evacuation, charge and manometer reading

3. Evaporator Unit

• The WM15-25SFCW evaporator units shall be installed for wall mount with
the air supply on the top and air return on the bottom.

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

- 1 -

• There is a gravity drain line and the unit shall be installed level or with a
slight angle toward the drain connection. If rise-up is needed, a
condensation pump must be used.

4. Air Sensor

• The air sensor can be located in the wine room 5 feet above the floor or
the return air area, but not the supply air area or air dead area.

• If the temperature cont roller is mounted outside the wine room but the air
sensor is located inside the wine room, use 18 gauge wires to extend the
air sensor if needed.

5. Refrigeration Piping, Evacuating, Charging and Starting

CAUTION:

• ALWAYS USE THE SUPERHEAT AND SUBCOOLING, PRESSURE

READINGS TO CHARGE REFRIGERANT PROPERLY, THE LISTED
CHARGES ARE FOR REFERENCE ONLY.

• CHARGE 15% MORE REFRIGERANT IN THE SUMMER IF THE UNIT IS

EQUIPPED WITH A LOW AMBIENT CONDITION KIT.

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

• Use inverted siphons to prevent liquid from flooding back to the
compressor and aid oil returning to the compressor.

• Charge the system after pipe brazing, leak testing and evacuating.

• 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 35­40°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
high load at 75°F ambient temperature.

• If the superheat is high, check the subcooling first to know
if the refrigerant charge is sufficient. If the charge is not
sufficient, add more refrigerant. If the charge is good, then
increase the evaporator suction pressure by turning the
hex nut (5/16”) clockwise.

• If the superheat is low, then decrease the evaporator
suction pressure by turning the hex nut (5/16”) counter­clockwise.

°F under low -

- 2 -