BC-N4 Glycol Chiller
Page: 46
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
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
Refrigerant Sight Glass
Evaporator
Summary of Contents for BC-N4 Series
Page 2: ......
Page 6: ...Page 6 THIS PAGE INTENTIONALLY BLANK ...
Page 20: ...Page 20 THIS PAGE INTENTIONALLY BLANK ...
Page 32: ...Page 32 THIS PAGE INTENTIONALLY BLANK ...
Page 48: ...Page 48 THIS PAGE INTENTIONALLY BLANK ...
Page 54: ...Page 54 THIS PAGE INTENTIONALLY BLANK ...
Page 62: ...Page 62 THIS PAGE INTENTIONALLY BLANK ...
Page 63: ...END 2016 ADVANTAGE ENGINEERING INC RE 09 27 2016 ...
Page 64: ......