Operation with Advanced Microprocessor with Graphics Control
3.5Operating Status
The Operating Status is intended to provide the user with displayed information about what the con- trol is calling for the system to do.
NOTE
There may be some time lapse before a specific component matches the displayed number.
For example: The display indicates the chilled water valve is 68% open. On a new call for cooling, it takes several seconds for the valve to travel from full closed to 68% open. So when the display reads 68%, it may take a few seconds for the valve to actually open 68%. Also, if the display indicates a com- pressor is operating but the compressor has not turned on yet, it may be off because of the short cycle control (see 4.4.1 - Short Cycle Control).
3.6View/Set Control Setpoints
Control setpoints can be reviewed and/or changed through the display. Refer to the following table to see the list of default setpoints and their allowable ranges.
Table 8 | Default setpoints and ranges |
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| Setpoint | Default | Range |
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Temperature Setpoint | 72°F | 40 to 90°F (5 to 32°C) | |
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Temperature Sensitivity | 2.0°F | 1 to 9.9°F (0.6 to 5.6°C) | |
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Humidity Setpoint | 50% | 20 to 80% RH | |
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Humidity Sensitivity | 5% | 1 to 30% RH | |
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High Temperature Alarm | 80°F | 35 to 95°F (2 to 35°C) | |
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Low Temperature Alarm | 65°F | 35 to 95°F (2 to 35°C) | |
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High Humidity Alarm | 60% | 15 to 85% RH | |
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Low Humidity Alarm | 40% | 15 to 85% RH | |
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3.7System Setup
Selecting SYSTEM SETUP will step to the following menu:
•SETUP OPERATION
•SELECT OPTIONS
•CALIBRATE SENSORS
•CALIBRATE VALVE ACTUATOR
•SELECT CONTROL ALGORITHM (chilled water or SCR Reheats only)
•SELECT HUMIDITY SENSING MODE
•SET STATUS DISPLAY
•CHANGE PASSWORDS
3.7.1Setup Operation
The SETUP OPERATION menu permits the review and/or adjustment of the unit configuration. This may include:
Cold Start Delay
This feature, also referred to as Positive Start or Winter Start Kit, allows for the low pressure switch to be ignored for the programmed time during a cold start of the compressor. Entering a “0” for this time will bypass this feature. A “1” will bypass the low pressure switch for one minute, a “2” for two minutes, etc. The programmed value can be from 0 to 3 minutes. This delay is factory set to 0 for water cooled, glycol cooled, and GLYCOOL units. Typically, only air cooled units need a “Winter Start” time.
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