Instruction manual

Maximum Series Portable Chiller : Air & Water-Cooled : M1 Series Instrument
Page: 80
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: [phone]
Service Department Fax: [phone]
Email: [e-mail]
8.1 OPERATIONS BELOW 48°F FLUID OR 38°F AMBIENT
A. The chiller is never to be operated below 48°F leaving water
temperature without several precautionary measures. All controls
are factory adjusted for 48°F and above operations.
B. Before readjusting the protective devices, a satisfactory antifreeze
solution must be substituted for the recirculating chilled water. This
mixture will consist of inhibited propylene glycol and water. Do not
substitute an inhibited propylene glycol and water solution with
common automotive type antifreeze. The chart on the next page
outlines the glycol percentages at various water temperatures.
C. Fluid must be tested with a hydrometer to verify proper glycol
percentages for freeze protection. The ratio shall be according to
the chart below. Too much glycol can cause capacity and control
problems.
D. DO NOT USE AUTOMOTIVE TYPE ANTI-FREEZE.
E. Once a satisfactory antifreeze solution is in place the protective
devices may be adjusted and the control instrument can be
unlocked to allow operation below 48°F.
E. If your unit is equipped with an adjustable low
pressure switch, adjust the low pressure switch
accordingtothespecicationsinthechartonthe
next page.
Never lower the cut out setting on the
adjustable low pressure switch without adding
glycol to the circulating system. Evaporator
damage will result and this damage is not
covered by the factory warranty.
F. If your unit is equipped with a non-adjustable
“xed”pressureswitchwithafactorylowlimitof
48°F this switch must be replaced with a switch
with a lower limit. The lower range low pressure
switch can be obtained from the factory by
calling 317-887-0729 and asking for the service
department. The model and serial number of your
unitisrequired.Aqualiedrefrigerationtechnician
is required to change the switch though no gas recovery is required.
Theswitchattachestoathreadedttingontherefrigerationline.
G. ADJUSTING THE SETPOINT LOCK OUT JUMPER: The control
instrument has a setpoint lock out jumper. This jumper controls
whether the user is allowed to reduce the setpoint below 48°F or
9°C. If the jumper is in position 1 (farthest from the SPL label) the
user IS NOT ALLOWED to reduce the setpoint below 48°F or 9°C.
If the jumper is in position 2 (closest to the SPL label) the user is
Adjustable low
pressure switch
Fixed low
pressure switch