This document introduces the application range, function features, installation and debugging steps of RM7890A,B,C/EC7890A,B relay modules.
This manual provides detailed installation instructions for the Honeywell RM7890A, RM7890B, RM7890C, EC7890A and EC7890B relay modules of the 7800 Series. It includes safety warnings, wiring diagrams, recommended wire sizes, grounding practices, and environmental ratings.
The document also contains the electrical specifications, terminal ratings, and a static checkout procedure to verify proper wiring and operation before the modules are placed in service. Additional sections cover selectable site‑configurable jumpers and service notes for troubleshooting.
| Voltage (RM7890) | 120 Vac (+10%/-15%), 50/60 Hz |
|---|---|
| Voltage (EC7890) | 220/240 Vac (+10%/-15%), 50/60 Hz |
| Power Dissipation | 10 W maximum |
| Maximum Total Connected Load | 2000 VA |
| Fusing Total Connected Load | 15 A maximum, type SC or equivalent, fast blow |
| Operating Ambient Temperature | -40°F to +140°F |
| Storage Ambient Temperature | -40°F to +150°F |
| Maximum Humidity | 85% relative humidity continuous, non‑condensing |
| Maximum Vibration | 0.5 G continuous |
The maximum total connected load is 2000 VA.