Overview
The Honeywell RA890G Protectorelay Primary Control provides solid-state electronic flame safeguard protection for industrial and commercial single or dual-fuel burner applications. This burner controller uses ultraviolet flame detection to monitor flame presence and automatically sequences the burner through ignition, pilot trial, and main flame establishment. The RA890G is designed for interrupted or intermittent ignition cycles on both gas and oil burners, delivering dependable safeguard control without warm-up time.
Key Features
- Solid-state electronic design eliminates mechanical warm-up, increases vibration resistance, and reduces component fatigue
- Flame establishing period up to 15 seconds (nominal)
- Recycles almost immediately after flame failure with single re-light attempt before lockout
- Compatible with C7027, C7035, or C7044 Minipeeper ultraviolet flame detectors for reliable flame sensing
- Optional isolated SPDT alarm contacts with male quick-connects (female quick-connects included) for alarm signaling
- Mounts on Q270A universal mounting base for standardized installation
Technical Specifications
The RA890G control module integrates timing, relay switching, and safety shutdown functions into a compact package engineered for industrial heating applications:
- 15-second safety switch timing with 3-second flame failure response time
- Designed for interrupted ignition with intermittent pilot for gas burners, and for interrupted or intermittent ignition on oil burners
- Ultraviolet flame detection method (rod or scanner)
- Solid-state rectifier and electronic control circuitry
- Input terminals for flame detector, pilot relay, main burner valve, and limit controls
- Output relay contacts for gas valve, ignition transformer, and alarm circuits
- Mounts securely over Q270A universal mounting base with ten mounting screws
Typical Applications
The RA890G primary control is widely used in:
- Industrial heating boilers and furnaces with gas or oil burners
- Commercial building HVAC systems requiring automatic burner sequencing
- Dual-fuel burner installations with automatic fuel switchover capability
- Process heating equipment in manufacturing facilities
- Retrofit projects replacing mechanical or earlier-generation electronic controls
Compatibility & Replacements
Compatible With
- C7027, C7035, and C7044 Minipeeper ultraviolet flame detectors
- Q270A universal mounting subbase
- C7076A Flame Detector with R7476A Amplifier (alternative UV detection system)
- Standard gas valve and ignition transformer circuits
- Manual reset and automatic reset limit controls
Replaces / Drop-In Replacement For
- RA890G-1260, RA890G-1047, RA890G-1062, RA890G-1112, RA890G-1120, RA890G-1179, RA890G-1187 (voltage and response-time variants)
- Earlier RA890 series primary controls requiring UV flame detection
- Legacy mechanical flame safeguard relays in commercial burner installations
Works With
- UV ultraviolet flame detection sensors and scanners
- 24 VAC pilot circuits and 120/240 VAC main circuits
- Standard HVAC/boiler wiring and control sequences
- Burner manufacturers’ control schemes and limit interlocks
- Building management systems (BMS) via alarm relay contacts
