Instruction manual

Maximum Series Portable Chiller : Air & Water-Cooled : M1 Series Instrument
Page: 40
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: [phone]
Service Department Fax: [phone]
Email: [e-mail]
The low pressure switch is set to cut-out at 32°F and cut-in at 36°F
-39°F*.Ifalowpressureconditionexistsformorethanveseconds
the compressor will stop and a “L-P” fault will appear in the display
window.
After the refrigerant pressure rises above the cut-in pressure, a
three minute time delay will occur before the compressor restarts.
This will protect the evaporator and compressor from damage
should a problem occur in the refrigeration system or if the chiller
is operated under circumstances which could cause damage to the
refrigeration system.
A. Low or no water ow through the evaporator.Adjusttheowper
section 3.2.C
B. Air-cooled units:
Head pressure too low. Check that entering air
temperatureisabove60°F.Ifbelow60°F,ndoutreason
why.
C. Water-cooled units:
Head pressure too low. Adjust condenser water regulating
valve to maintain 100°F - 105°F refrigerant condensing
temperature*. Have a refrigeration serviceman repair the
valve or replace if defective.
The water regulator valve is normally factory set for proper
operation.Wheneldadjustmentsarerequired,turnthe
adjusting nut on the top of the valve counter clockwise to
raise the refrigerant pressure and clockwise to lower the
pressure. Adjustments should be made only when the chiller
is running at full load.
D. Low refrigerant charge. Check for adequate refrigerant charge
(bubbles or misty sight glass indicates low charge). If charge is low,
have system checked for leaks and recharged by a refrigeration
serviceman.
E. Improperly set low pressure switch. Have a refrigeration
serviceman reset control or replace if defective.
F. Restriction in the liquid line.
1. Clogged lter drier. Check for pressure or
temperature drop and have drier core replaced by a
refrigeration serviceman.
2. Liquid line valve or suction valve on compressor
is partially closed. Open fully.
3. Liquid line solenoid not opening fully or leaking
* See Temperature-Pressure
chart in Section 8.2 for
refrigerant pressure.
* See Temperature-Pressure
chart in Section 8.2 for
refrigerant pressure.