Instruction manual

Maximum Series Portable Chiller : Air & Water-Cooled : M1 Series Instrument
Page: 53
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: [phone]
Service Department Fax: [phone]
Email: [e-mail]
5.6 CHECKING THE REFRIGERANT CHARGE
A. All standard chillers are
manufactured with thermostatic
expansion valves as the metering
device to the evaporator.
B. All standard chillers have a
refrigerantsightglass(gure5.6A)
with a moisture indicator. To check
the refrigerant charge under normal
operating conditions:
1. Remove the plastic cap
covering the sight glass.
2. Start the chiller and allow system pressures and
temperatures to stabilize.
3. With the unit operating at 100% capacity (not in the
“capacity control” mode) the sight glass should appear clear
with no foam or bubbles evident. If foam or bubbles are
evident, the chiller has suffered from a loss of refrigerant
andshouldbecheckedbyaqualiedrefrigeration
technician.
4. The “dot” in the middle of the sight glass is the moisture
indicator. It should appear green at all times. A white or
yellow color indicates moisture has invaded the refrigeration
system, which is detrimental to the life of the compressor.
Thelter-driershouldbereplacedbyaqualiedrefrigeration
technician.
5.7 PROPER CLEANING PROCEDURE FOR BRAZED PLATE
EVAPORATORS
A. The brazed plate evaporator is
made of stamped stainless steel
plates, furnace brazed together with
copper based joints. The complex
geometryoftheowpassages
promotesturbulentowwhichgives
highefciencyandreducesfouling
by mineral deposits. Large solids
such as plastic pellets or chunks of
mineral deposits will collect at the
water inlet port at the evaporator
andrestrictowthroughsomeof
the passages. If this possibility
exists, the Manufacturer recommendsltersorstrainers
be added to the “from process” line. If the evaporator becomes
fouled there are a couple of methods for cleaning.
Sight Glass
Figure 5.6A
Evaporator
Figure 5.6A