Pcm Override Displays: Notes

The PCM override feature allows testing of certain system functions regardless of normal program instructions. Upon selecting a test, the current operation of that function will be displayed on the CCDIC. The display will alternate between "--" for 1 second followed by the normal program command for 5 seconds. This alternating display is a reminder that the function is not currently being overridden.

Pressing the WARMER or COOLER buttons on the ECC panel initiates the override at which time the display will no longer alternate to "--".

Generally speaking, pressing the WARMER button increases the override value while pressing the COOLER button decreases the override value (exceptions are noted in the description of the override). Upon release of the button, the display may either remain at the overridden value or automatically return to normal program control. This depends on which function is being overridden at the time. If the display remains at the override value, normal program control can be resumed in one of three ways:

1. Selection of another override test will cancel the current override.
2. Selection of another system (e.g., BCM) will cancel the current override.
3. On some system overrides, overriding the value beyond either extreme (0 or 99) will display "--" momentarily and jump to the opposite extreme. If the button is released while "--" is displayed, normal program control will resume and the display will again alternate.