DIAGNOSTICS Menu
PKG-SVP01E-EN
47
Failure Modes
When any condition results in the rooftop unit’s inability to
perform a normal function, it is said to have entered a
failure mode. There are two types of failure modes.
1. An “Analog input out of range” failure mode.
This failure mode occurs when a sensing device such
as a zone temperature sensor or a humidity sensor
begins to transmit information that is outside its
allowable range.
2. A “Fault recognition by input logic” failure mode.
This failure mode occurs when the UCM receives
information that does not “make sense” or does not
conform to its predefined logic.
Diagnostics Types
There are three types of diagnostics:
1.
Informational - Does not affect machine operation.
2. Automatic Reset - Affects machine operation but
returns to normal when diagnostic condition no longer
exists.
3. Manual Reset - Affects machine operation and must be
reset at the HI or by cycling power to unit for normal
operation to resume.
To troubleshoot diagnostics, reference the Installation,
Operation, and Maintenance Manual SCXF-SVX01*-EN
that ships with the Signature Series units and SCXG-
SVX01*-EN that ships with the Modular Series units.
Log 1 ___________________
___________________
Possible Values:
Log number 1-20
Manual
Viewed or Not Viewed
Auto
Active or History
Info
Or any diagnostic listed under the previous screens associated with the diagnostic type
including VOM activated mode
1.
Press the CANCEL key to clear the diagnostics and prompt the following screen.
Diagnostic Log is Password Protected
Possible Values: + (Plus), - (Minus)
Please Enter Password: ___________________
1.
Press the + (Plus) or - (Minus)keys to enter the password.
2.
Press the ENTER key to confirm. After entering the correct password, the following screen will display.
Active Diagnostics ___________________
Possible Values: Manual, Auto, or Info
Please Wait, Updating Diagnostic Log
If the DIAGNOSTIC LOG is empty when the CANCEL key is pressed, the following screen will display.
Active Diagnostics Info
Possible Values: Manual, Auto, or Info
Diagnostic Buffer Is Already Empty!
Press the AUTO or STOP key to return to the top level status screen.
