Schreiber Chillers MICRO MAX CHILLERS - Manual (Page 10)

10
The Carel uchiller has many parameters available. Only a few will ever need to
be adjusted.
Parameter Function
R1
Cooling Set point
R2 Cooling Differential
R6 Return Temperature Reading
Changing Set points:
Cooling Set point:
1. Press the “SEL” key for 5 seconds. “R1” will appear on the screen.
2. Press the “SEL” key and adjust the desire cooling value. Press the “SEL” key
to store the value.
3. Hit the “PRG” key to return to normal operation.
Refrigeration System
• The refrigeration system is factory charged with R-134A. If the refrigeration
system has to be serviced and recharged with refrigerant, do not use any other
than R-134A.
• The MICRO MAX series chiller is equipped with a refrigerant low-pressure and
high-pressure refrigerant switches. The low-pressure switch is an automatic reset
switch that will protect the compressor in the event of a refrigerant leak. It is set at
25-psi. The high-pressure switch is a manually resetting switch. The controller
turns off the refrigeration unit when it detects a high-pressure condition in the
refrigeration system. Chiller shut off at he refrigerant high pressure due to a dirty
condenser, excessive ambient temperature, or a blockage in the refrigerant line.
The high-pressure switch is set at 425-psi. Pressing the red button on the switch
will reset the circuit.
• This is a medium temperature chiller. The temperature range is 45 to 90°F. The
chiller will not operate to its full capacity outside of this temperature range.
Chilled Water System
• A 265 GPH (Gallons per Hour) positive displacement pump is equipped with this
chiller. Because of its design, the flow rate is not adjustable. The pressure can be
adjusted by throttling the discharge. If the discharge is throttled too much, the
internal pressure relief valve will open and bypass water back through the tank.
The pressure relief valve is factory set at 60-psi.
• The water used to fill the chiller must be absolutely free of any particulate matter.
If any particles or sediment is run through the pump it will score the inside,