Specifications

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OUTPUT CONFIGURATION
SP1.d – (SSd1) Do not change. Assigns humidification control to the
appropriate output.
SP2.d – (SSd2) Do not change. Assigns dehumidification control to the
appropriate output.
SAFETY SETTINGS
Burn – (uP.SC) Do Not Change. Sensor burnout/break protection. This safety
setting is not applicable for RH control, it is meant as a high temperature / low
temperature cutoff for heating applications to protect the surroundings from
damage due to sensor failure.
rEv.d – (1r.2d) Do Not Change. Select output modes: Direct/Reverse. Select
Reverse for Humidification and Direct for Dehumidification.
rEv.l – (1n.2n) Do Not Change. Selects Microprocessor LED display mode.
Normal mode is selected for each LED. In normal mode, the lower left (red) LED
will light when the microprocessor calls for dehumidification and the upper left
(green) LED will light when the microprocessor calls for humidification.
SPAn – (-60) Do Not Change. Changing the SPAn will affect unit calibration.
NOTE
The calibration settings (SPAn & ZEro) should not be altered. All calibration
should be performed on the Model 554 Sensor (Temp. & RH) directly, or through
the calibration potentiometers on the Model 518 ‘Sensor Interface Board’. The
SPAN adjustment pot on the ‘Sensor Interface Board’ is far more accurate than
this microprocessor setting.
ZEro – (0.0) Do Not Change. Zero sensor error, see SPAn.
NOTE
The Model 518 ‘Sensor Interface Board’ includes an internal ZERO adjustment
pot that is far more accurate than the microprocessor setting.
PERFORMANCE DATA
ChEK – (oFF) Select control accuracy monitor.
rEAD – (Var) Read control accuracy monitor.
TECH – (Ct A) Read Autotune cycle data. Using the Autotune function is not
recommended.