Daikin MAGNITUDE WMT, Installation Operation & Maintenance

41 

IOM 1297

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OPERATION

Alarms

The Alarm information is accessed by touching the ALARM icon 

at the bottom of the HMI and then the Active or History tabs at the 

top of the screen. An active alarm will turn the icon flashing red.
There are two types of alarms: 

1 . 

Critical Alarm (Red) 

- This is an equipment protection 

alarm that will shut a unit or compressor off if not corrected.

2 . 

Warning (Yellow) 

- This alarm limits compressor loading 

in response to an out-of-normal condition or may only be a 

notification to indicate that the condition requires attention. 

This alarm may not cause a shutdown. If the condition 

that caused a warning is corrected, the alarm light will be 

cleared automatically.

The Alarm Active and History Screens display a maximum of 18 

alarms for the current date with the most current alarms listed on 

top. Each alarm displays the date stamp, action taken, and the 

cause of the alarm. See the Alarm tables starting on 

page 43

for specifics on alarms that may occur. Alarm history data is held 

for 365 days as shown on the Interface tab in 

Figure 47

 . 

Digital Alarm Output

On the field wiring diagram there is an option for the customer 

to wire to a digital alarm output.  There is both a normally 

closed (NC) and normally open (NO) option depending on if the 

customer wants a contact that opens on alarm (NC) or a contact 

that closes on alarm (NO).  Alarm state will maintain until the 

alarm is cleared. Note that by default the digital alarm output 

will trigger on all critical alarms, including critical alarms that are 

displayed as warnings and auto-cleared. Changing the Alarm 

Output on Auto Clear HMI setting to false will suppress the digital 

alarm output for auto-cleared critical alarms that are able to be 

cleared automatically.

Clearing an Alarm

There are two different indicators that the chiller will generate 

when conditions arise that are affecting the chiller operations.  

Warnings are indicated in yellow on the HMI and communicate 

that the chiller should be serviced but allow the chiller to keep 

running. Warnings cannot be cleared manually and will be 

cleared automatically when the issues has been resolved.  
Critical Alarms will always shutoff the chiller and Critical Alarms 

that do not require external intervention may attempt to auto-clear 

once conditions return to normal (Pressure and Temperature 

Alarms). Auto-cleared Critical Alarms will be yellow and will be 

displayed as warnings unless there has been 3 within the hour. 

After 3 alarms occur within the hour, the Critical Alarm will be 

displayed as a Critical Alarm by being indicated in Red on the 

HMI and will prevent the chiller from running until manually 

cleared at the HMI or via the BAS. Critical Alarms that require 

external intervention (Communication and Sensor Alarms) will 

immediately show up as Red Alarms on the HMI and prevent the 

chiller from running until manually cleared at the HMI or via the 

BAS, after the condition has been resolved.
Repeated manual clearing of Critical Alarms via the HMI or the 

BAS without resolving the cause of the Alarm may damage the 

chiller and void the chiller warranty.
Although the Alarm History Screen only displays the most current 

alarms, a record of ALL alarms is stored in the Unit Control 

Processor. Note that this record may include alarms that occurred 

when the chiller was not yet fully assembled in the factory. 

This record is maintained even if the Unit Control Processor 

is powered off. When the HMI is powered back on, the last 18 

alarms for the current date will show on the Alarm History Screen 

and all alarm history will still be available for download.