PRODUCT DESCRIPTION SECTION 4
16
4.1.6 REFRIGERANT CIRCUIT REGULATION IN
RC-0150 – RC-3000
1. The liquid refrigerant is injected into the
evaporator through a metering device trying
to maintain the refrigerant in the evaporator
at a constant pressure
2. The evaporating pressure is kept constant by
a controlled injection of hot gas from the
high-pressure side into the low-pressure
section of the circuit through a hot gas by-
pass valve. This constant pressure corre-
sponds to a stable evaporating temperature
adjusted as close to 32 Deg. F as possible.
3. The mixture of hot gas from the by-pass
valve and cold gas from the evaporator is
called superheat and is adjusted at (50 ± 5)
Deg. F
4.1.7 CONDENSATE DRAIN - TRAP
ASSEMBLY
Dismantling the drain is easy because it can be
isolated from the air circuit under pressure with a ball
valve. Always isolate the drain before disassembly.
4.1.8 HEAT EXCHANGER, MODULAR DESIGN
The dryers are equipped with compact, modular
design heat exchangers. This assembly has been
specially designed to dry compressed air and
consists of:
1. An air/air heat exchanger which pre-cools
the entering hot air with the exiting chilled air.
2. An evaporator which is an air/refrigerant heat
exchanger which cools down the com-
pressed air
3. An integral separator that separates the
moisture from the air stream at the coldest
point. Maximum condensation of moisture
occurs at the coldest point and it is at that
exact junction that the moisture is removed
and drained.
4.1.9 ELECTRONIC CONTROL PANEL
It is important to note that when changing the
controller’s reading from C to F or F to C the
technician must change all of the parameters. The
controller program lists each temperature setting one
at a time for programming. The last parameter is the
displayed reading. Once the controller is set to read
either C or F it will then read all of the parameter
settings as that scale.
Example: The AStL (low glycol temp set point) is set
from the factory at 1◦C.
The technician changes the scale from Centigrade to
Fahrenheit.
The AStL parameter will now read 1◦F.
The dryer will now try to pull the glycol temperature
down to 1◦F causing the dryer to freeze.
The AStL parameter will now need to reset to 28
which will be read by the controller as 28◦F.
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