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BOARD I/O # DESCRIPTION TYPE
#
10 1 Compressor VFD 4-20 mA
10 2 Condenser VFD 4-20 mA
10 3 % Slide Valve Position 4-20 mA
10 4 Motorized Valve (Cool Compression or Liquid Injection), V+ 4-20 mA
10 5 Profile Cooler VFD (Profile only) 4-20 mA
10 6
10 7
10 8
COMPRESSOR VFD – 4-20mA output to control compressor motor speed with a Variable Frequency Drive (VFD).
CONDENSER VFD – 4-20mA output to control one condenser fan which is interleaved between the remaining
condenser steps for smoother control.
% SLIDE VALVE POSITION – 4-20mA signal that transmits the slide valve position for remote monitoring.
MOTORIZED VALVE (V+) – for a cool compression compressor, this 4-20ma signal controls a motorized valve to
regulate the liquid refrigerant level in the oil separator. For a liquid injection application on a standard single
screw, this 4-20ma signal controls a motorized valve to regulate the liquid refrigerant injected into the compres-
sor for oil cooling purposes.
PROFILE VFD – for a profile unit compressor, this signal controls the aftercooler fan speed which provides oil cool-
ing.
Analog Outputs