Emerson PFH020A-L, User Manual

Page: 51 / 117

Microprocessor Control
Liebert
®
Mini-Mate2
™
44
6.1.9 Calibrate Sensors
The temperature and humidity sensor can be calibrated by selecting the CALIBRATE SENSORS
menu item. The temperature sensor can be cali5°F, while the humidity sensor can be
calibrated ±10% RH. When calibrating the humidity sensor, the value shown will always be % RH,
even though absolute humidity control may be selected. If absolute humidity control is selected, the
Normal Status Display will display the adjusted reading. This reading may not agree with the
relative humidity reading displayed while in calibration.
If the sensors are subject to frequent wide temperature and humidity swings, it may be necessary to
shorten the cycling by increasing the sensor time delay. If the cycling by increasing the sensor time
delay. If the sensors are located too close to the air discharge, they will likely experience rapid swings
in measurement. Another method in reducing compressor cycling is to increase the temperature
and/or humidity sensitivity.
6.1.10 Alarm Enable
Each alarm can be disabled or enabled. Use the Up/Down Arrows to select a particular alarm, press
Enter to select either enable or disable. Then press Enter again to store the change. When the alarm
is disabled it will NOT report to either the wall box beeper or the common alarm relay. THE HIGH
WATER ALARM WILL AUTOMATICALLY SHUT THE UNIT OFF, EVEN IF THE ALARM IS
DISABLED. SIMILARLY, OPTIONAL FACTORY-INSTALLED SMOKE DETECTORS ARE WIRED
TO SHUT THE EVAPORATOR UNIT OFF, REGARDLESS OF THE ENABLE/DISABLE STATUS.
6.1.11 Alarm Time Delay
Each individual alarm can be programmed with a time delay (see Table 19 ), causing the unit to delay
a specified amount of time (0-255 seconds) before recognizing the alarm. The alarm condition must be
present for the full amount of the time delay before the alarm will sound. If the alarm condition is
diverted prematurely, the alarm will not be recognized and the time delay time will automatically
reset. FOR SOFTWARE ALARMS SUCH AS “LOSS OF POWER” AND “SHORT CYCLE”, THE
TIME DELAY SHOULD BE LEFT AT THE FACTORY DEFAULT OF 0.
6.1.12 Common Alarm Enable
Each individual alarm can be selected to activate/deactivate the common alarm relay. If the energize
common alarm function is set to YES, the relay is energized immediately as the alarm is annunciated
and de-energized when the alarm condition is diverted after the alarm has been recognized. If the
alarm is completely DISABLED, the alarm has no effect on the common alarm relay. Use the
Up/Down Arrows to scroll to a particular alarm, press the Enter button to select it, then press the
Enter button again to select Yes or No.
Table 19 Alarm default time delays
Alarm
Default Time Delay
(seconds)
Humidifier Problem 2
High Head Pressure 2
Custom Alarm #1 0
Custom Alarm #2 6
High Temperature 30
Low Temperature 30
High Humidity 30
Low Humidity 30
Short Cycle 0
Loss of Power 0