Key facts
- Brand
- Honeywell
- Model
- 7800 Series Relay Modules
- Category
- Industrial Supply
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-07
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Honeywell RM7890A/B/C EC7890A/B 7800 Series Relay Modules Installation Guide
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.
Honeywell 7800 Series Relay Modules specifications
| 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 |
Source: Honeywell RM7890A/B/C EC7890A/B 7800 Series Relay Modules Installation Guide
All Honeywell 7800 Series Relay Modules documents by type
Mounting, wiring and first power-up. Read it before the hardware goes in.
Disassembly, diagnostics and part numbers, for repair.
Questions answered in these manuals
What is the maximum total connected load for the RM7890 assembly?
The maximum total connected load is 2000 VA.
From: Honeywell RM7890A/B/C EC7890A/B 7800 Series Relay Modules Installation Guide
How long may the pilot be on before the system shuts down for safety?
The pilot may be on for 0.8 seconds or three seconds depending on the PFEP setting before the sequence must be stopped.
What is the minimum flame‑signal voltage required for the pilot detector?
The pilot flame signal must be at least 1.25 Vdc to be considered valid.