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Titan Central Chillers
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 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 qualified 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
filter-drier should be replaced by a qualified 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 flow passages promotes
turbulent flow which gives high efficiency 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 flow
through some of the passages. If this possibility exists, the
Manufacturer recommends filters or strainers be added to the
"from process" line. If the evaporator becomes fouled there are
a couple of methods for cleaning.
B.
To begin, remove the piping to the "water in" port at the
evaporator. Remove any solids that have collected at this
point. Then back flush the evaporator to remove any solids that
may be trapped between the plates (see back flush procedure
below). If there are mineral deposits adhered to the plates, the
evaporator must be back flushed with a mild acid solution (5%
phosphoric or 5% oxalic acid is recommended.) After cleaning
rinse with clear water before returning to service. Continue with
step C on the next page.
C.
Back flushing procedure:
1.
Turn off all power to the machine. For chillers with a reservoir tank, drain the tank
to below the evaporator outlet. For chillers without a reservoir tank, drain total
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
Refrigerant Sight Glass
Brazed Plate Evaporator
Page: 67
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