This document provides general checkout and troubleshooting procedures for the 7800 SERIES Relay Modules. Perform all Static Checkout Procedures in the applicable relay module installation instructions before starting these procedures.
This manual provides general checkout and troubleshooting procedures for Honeywell 7800 Series Relay Modules. It includes safety warnings for explosion and electric‑shock hazards, static checkout requirements, and detailed steps for system startup, pilot ignition, and main burner lighting.
The document covers a range of tests such as preliminary inspection, flame‑signal measurement, pilot turndown, ignition interference, hot‑refractory saturation, and spark‑response checks. Recommended test equipment and voltage specifications are also listed.
| Recommended Keyboard Display Module | $7800A |
|---|---|
| Volt‑ohmmeter minimum sensitivity | 1 MΩ |
| Volt‑ohmmeter voltage range | 0‑300 Vac |
| Volt‑ohmmeter resistance range | 0‑6000 Ω |
| Volt‑ohmmeter DC voltage range | 0‑10 Vde |
| Minimum pilot flame signal voltage | 1.25 Vdc |
The pilot may be on for 0.8 seconds or three seconds depending on the PFEP setting before the sequence must be stopped.
The pilot flame signal must be at least 1.25 Vdc to be considered valid.
A $7800A Keyboard Display Module and a volt‑ohmmeter with at least 1 MΩ sensitivity, 0‑300 Vac, 0‑6000 Ω, and 0‑10 Vde capability are recommended.