Problem:
Symbio 800 units come with a phase monitor that helps protect the unit's compressors, VFDs, and motors by checking the incoming power for phase reversal and phase loss. Units with firmware versions below 4.10.002 needed a manual reset on the unit if the phase monitor was triggered. For units with firmware version 4.10.002 or higher, this alarm now resets automatically.
To keep up with factory production, your unit might come with one of two different incoming power phase monitors: the ICM402A or the Kriwain INT69. We've learned that the Kriwain phase monitor does not reset automatically. This means that if the Kriwain monitor trips, you'll need to power cycle the unit to reset it.
Solution:
PHASE MONITOR MODE OF OPERATION:
IF ALL 3 PHASES ARE RELATIVELY EQUAL AND IN PROPER SEQUENCE, THE NORMALLY OPEN CONTACTS
(Y/Y-OUT) WILL CLOSE WITHIN 0.7S WHEN 115 VOLTS IS APPLIED BETWEEN C AND 115VAC TERMINAL.
IF THE PHASES ARE OUT OF SEQUENCE, OR IF ONE IS MISSING, THE CONTACTS WILL NEVER CLOSE. IF A
PHASE IS LOST WHILE THE PHASE MONITOR IS ENERGIZED, THE CONTACTS WILL OPEN AFTER APPROX. 0.7S AND WILL REMAIN OPEN UNTIL THE ERROR IS CORRECTED.
NOTES:
- 1K – OHM JUMPER MUST BE CONNECTED BETWEEN INDICATED TERMINALS BY SUPPLIER AND ONLY
APPLICABLE FOR KRIWAN MODEL. - KRIWAN MODULE REQUIRES A MANUAL RESET AFTER A PHASE LOSS OR REVERSAL EVENT AND ICM MODULE IS AUTO-RESET
- IF YOUR UNIT SHIPPED WITH KRIWAN MODULE AND REQUIRES A MANUAL RESET AFTER SWITCHING FROM GRID TO GENERATOR OR VICE VERSA. YOU WILL NEED TO CONTACT LOCAL PARTS AND ORDER MON00046 AND REQUEST THE ICM MODULE IN YOUR ORDER NOTES.
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.