3
Electrical Connections
Operation of dryers with improper line voltage constitutes
abuse and could affect the dryer warranty.
The dryers are constructed according to NEMA Type 1 electrical
standards. Field wiring must comply with local and national fire,
safety and electrical codes. Installation must be in accordance
with the National Electrical Code. Confirm that your line voltage
is the same as the voltage listed on the dryer data plate. Refer
to Figures 6A, 6B, 6C, and 6D electrical schematics.
HOW IT WORKS
Phase Change Mechanism of the FLEX Dryer
1. When the refrigeration compressor and the condenser fan
are running, the cold refrigerant in the chiller (evaporator)
cools the liquid Phase Change Material (PCM) which gradu-
ally solidifies.
2. When the PCM is sufficiently cooled and solidified, the
refrigeration compressor and condenser fan will stop.
3. The compressed air is continuously cooled by the PCM
while the refrigeration compressor is inactive. No power
is consumed during this period.
4. The PCM gradually liquefies as it adsorbs heat from the
compressed air, and when fully melted, the refrigeration
compressor and condenser fan resume to cool the PCM.
Compressed Air flow
The dryers use refrigeration cooling to condense entrained
moisture out of the air stream. Warm saturated air enters the
air-to-air heat exchanger where it is cooled by outgoing cold
air. The inlet air is further cooled in the refrigeration chiller. The
condensate is removed from the air stream by an electronic
drain valve.
The cold, dry air is reheated by incoming warm air as it passes
back through the air-to air heat exchanger. Using the outgo-
ing air to pre-cool the inlet air condenses up to 65 percent of
the moisture out of the inlet air before it reaches the chiller.
Pre-cooling the inlet air reduces the heat load on the refriger-
ant compressor, permitting the use of a smaller refrigerant
compressor.
Figure 2.
Schematic diagram of the compressed air flow and
refrigerant
CONTROLLER
There are two kinds of Controllers, the Level 1 has basic functions
while the Level 2 has advanced functions like communication
and operating status data storage.
The Level 1 Controller is standard for models FLX 1.1 and FLX
1.2. The Level 2 Controller is standard for models FLX 1.5-1, FLX
1.5, FLX 2.1, FLX 2.1-4, FLX 3.1, FLX 4.1, FLX 4.5, and FLX 5.5.
Level 1
Level 2
Figure 3.
Controller
a: DRYER ON/OFF SWITCH
b: ALARM LIGHT
c: REFRIGERANT COMPRESSOR RUNNING LIGHT
d: DRYER RUNNING LIGHT
e: ENERGY SAVING RATIO (%)
f: DEWPOINT TEMPERATURE INDICATOR
g: RUNNING TIME SELECT BUTTON
h: DRYER RUNNING / REFRIGERANT COMPRESSOR RUNNING TIME
i: ENERGY SAVING (GRAPH)
j: TIMER BUTTON (LEVEL 2 ONLY)
k: MICRO-USB CONNECTION PORT (LEVEL 2 ONLY)
Functions
1. Level 1 Controller
(i) Dryer On/Off
(ii) Display energy saving ratio (%)
(iii) Display alarm signal
(iv) Display dryer and refrigerant compressor running
time
(v) Display dew point level by indicator
Summary of Contents for SPX Flow FLEX Series
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