Sullair 02250201-297 R01, User Manual

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PRODUCT USER MANUAL SECTION 2
12
damage the compressor.
2.10.6 R
EFRIGERANT CIRCUIT REGULATION IN
RD-0400 – RD-6000
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°F / 0°C 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°F / 10±
5°C.
2.10.7 C
ONDENSATE 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.
Membrane disc may need to be replaced time to time
due to contamination in the air circuit. Contact Sullair
or its distributer if there is any drain blockage issues.
2.10.8 H
EAT 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.
2.10.9 D
EW
P
OINT
I
NDICATOR
The Dew point indicator is a standard on all dryer
models and is located in the control panel and
provides an idea for the pressure dew point (PDP)
2.10.10 H
IGH
T
EMPERATURE
S
WITCH
—
Located inside the dryer, this high temperature
switch stops the dryers if the compressor suction line
temperature is above 113°F / 45°C.
2.10.1 M
ICROPROCESSOR DEVICE
This device is supplied on all models. The
Microprocessor allows the dryer to save energy
when there is no flow in the dryer. It is possible to
monitor major dryer failures on the Microprocessor. It
allows the operators to monitor the following:
• Evaporation temperature
• Inlet air temperature
• Ambient temperature
• Refrigerant gas high and low temperatures
• Fan is working properly
• Compressor is working properly
• Condenser is blocked
• Power Phases are correctly connected
• Drain function
• Total working hours
• Total economy hours
• Real date and time
Microprocessor can be remotely controlled and any
alarm contacts can be connected to any external
devices.
2.11 PRINCIPLE OF OPERATION
The refrigerant circuit can be divided in 3 parts:
1. Low pressure section with an evaporator
(heat exchanger)
2. High pressure section including: Condenser,
liquid receiver, (if installed) and the filter
dryer.
WARNING
Never run the dryer before heating the
crankcase. Allow 2 hours the heater to heat
the compressor of the dryers after a long
shut-down period.