Status Display; Main Menu <Menu/Esc; Status/Alarm Data; Active Alarms - Liebert Himod Operation & Maintenance Manual

2.2

Status Display

The display normally shown includes the present room temperature, humidity, active status func-
tions (cooling, heating, dehumidifying, humidifying), and active alarms. If no keys are pressed for five
minutes, the system automatically returns to the Status Display. The Status Display may also be
selected from the Main Menu.
2.3 Main Menu <MENU/ESC>
Press the MENU/ESC key to display the Main Menu. The Menu selections include:

• Status/alarm data

• Setpoints/setup
• Date and time
• Status display
2.4 Status/Alarm Data
Selecting STATUS/ALARM DATA from the Main Menu will display the following selections:

• Active alarms

• Operating status

• Alarm history log

• Run hours log
• Analog sensors
2.4.1 Active Alarms
This screen displays any active alarm. The alarms are numbered, #1 being the most recent. If there
are no active alarms, then "NO ALARMS PRESENT" will be displayed.
2.4.2 Operating Status
The Operating Status is intended to provide the user with displayed information concerning what the
control 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 (from Econ-O-Coil) 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 dis-
play indicates a compressor is operating but the compressor has not yet turned on, it may be off
because of the short cycle control (see 4.4.1 - Short Cycle Control).
2.4.3 Alarm History Log
A history of the ten (10) most recent alarms is kept in nonvolatile memory complete with the date and
time of its occurrence. The first alarm in the history is the most recent and the tenth is the oldest. If
the alarm history is full (10 alarms) and a new alarm occurs, the oldest is lost and the newest is saved
in alarm history location 1. The rest are moved down the list by 1. Alarm history on new units may
show the results of factory testing.
Operation with Advanced Microprocessor Controls 5