Advantage Engineering Maximum Instruction Manual page 41

MK Series Portable Chiller : Air-Cooled : HE INSTRUMENT
4.6 LOW FLOW FAULT
A. Indicates low flow through the evaporator.
B. Two pump chillers have a pump dedicated to the evaporator. The
flow safety switch is located in the evaporator circuit and does not
sense process flow.
C. One pump chillers require 100% of the process flow to circulate
through the evaporator.
D. In some process conditions the minimum flow required cannot be
maintained at all time making it necessary to install a bypass line
between the "to" and from process lines to maintain the minimum
flow at all times.
4.7 HIGH PRESSURE
A. If the refrigerant high pressure safety switch has opened, this switch
must be manually reset after the problem has been resolved.
B. Refrigerant high pressure will vary with ambient temperature from a
minimum of 190 psi to as high as 280 psi. Check for restricted
condensing water supply and return lines, defective regulator valve
on water cooled models or restricted air flow on air cooled models.
4.8 LOW PRESSURE
A. If the refrigerant low pressure safety switch has opened, the cause
of the problem must isolated and resolved.
B. The switch will automatically reset when the pressure rises above
the cut-in pressure. If this does not occur contact the ADVANTAGE
service department for instructions.
C. The low pressure switch is set to cut-out at 58 psi and cut-in at 63
psi. If a low pressure condition exists for more than five seconds the
compressor will stop and a "L-P" fault will appear in the display
window.
D. 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.
E. If a low pressure fault occurs, check for blockage in the evaporator
water inlet. If a blockage is found, back flush the evaporator and
flush complete process water system.
F. Check for low freon. The refrigerant sight glass should appear clear
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: 317-881-1277
Service Department Fax: 317-885-8683
Email: service@AdvantageEngineering.com
Page: 41