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  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 controller 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 35-

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 - 

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”) counter-
clockwise. 

Summary of Contents for WINE-MATE 250SCU

Page 1: ...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 th...

Page 2: ...ion 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...

Page 3: ...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 siph...

Page 4: ...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 EVAPORAT...

Page 5: ...pressure High superheat and high subcooling o low to normal suction pressure and high head pressure High to normal superheat and high subcooling g Undercharge h Liquid line restricted after receiver...

Page 6: ...n 170 psig Cut out 120 psig Differential 50 psig It may need to adjust the setting in the field to prevent short fan cycle 10 Use of the crankcase heater if applicable for low ambient kit The crankcas...

Page 7: ...led components d Liquid refrigerant in the compressor e Low pressure switch shutting down the system a Check for proper voltage b Check all wirings and connections c Check start relay start capacitor...

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