Pyro-Chem Double Action Pull Station - 551166
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The Pyro-Chem Double Action Pull Station (551166), designated as Model RPS-E2, is a mission-critical manual command station engineered for the Kitchen Knight II and Monarch industrial fire suppression systems. In the sophisticated architecture of fire safety, the RPS-E2 serves as the human fail-safe. While automatic detection systems rely on thermal fusible links or electronic sensors, the RPS-E2 allows on-site personnel to initiate a full suppression discharge instantly from a safe distance, such as a designated point of egress.
Designed for high-traffic and high-vibration industrial environments, the 551166 utilizes a double-action mechanical gate. By requiring two distinct physical movements to actuate, the RPS-E2 virtually eliminates the risk of accidental triggering. For facility managers, the RPS-E2 is more than a pull station; it is a rugged manual override interface designed to protect against costly system downtime.
Tactile Intentionality
In a standard single-action station, a single snag of a cleaning cloth can trigger a discharge. The RPS-E2 requires push-and-pull mechanics, a push in of the front plate followed by a pull down of the handle. This mechanical sequence ensures that actuation is a result of deliberate human intent, providing essential nuisance trip mitigation.
Die-Cast Structural Integrity
Unlike consumer-grade plastic units, the 551166 is constructed from a heavy-duty, corrosion-resistant die-cast metal alloy. This is critical in environments where aerosolized grease and caustic cleaning chemicals can degrade plastic over time. The metal housing ensures the hinges and switch mechanisms remain viable for the entire service life of the system.
High-Visibility Fire Red Finishing
The unit is finished with a high-impact, oven-cured fire red powder coat. This ensures the station remains visible through thick smoke or during power failures, guiding personnel to the manual release point when seconds count.
SPST Switch Architecture
The unit features a high-reliability single pole single throw (SPST) switch. When the handle is pulled, the switch completes the circuit, sending a low-voltage signal to the Electric Control Head (ECH3) or the system's main control panel.
Supervised Circuitry Dynamics
In a professional installation, the RPS-E2 is typically wired with an end-of-line resistor (EOLR). The control panel constantly monitors the circuit for continuity. If the wiring is cut or the station is tampered with, the resistance changes and the panel triggers a trouble signal, ensuring the system does not sit in a dead state.
ECH Coordination
Upon receiving the signal from the 551166, the Electric Control Head triggers a pneumatic actuation cartridge. This pulse travels through the manifold to the agent cylinders, initiating a total discharge. This electrical setup is ideal for complex layouts where routing mechanical cables around multiple corners would be impossible.
- High-Volume Commercial Kitchens: Positioned near exits to serve as the chef's final fail-safe for the Kitchen Knight II system.
- Industrial Paint Spray Booths: The electrical nature of the RPS-E2 allows it to be placed outside the hazardous vapor zone of a Monarch system.
- Hazardous Material Storage: Providing a rugged, vibration-resistant manual trigger for chemical lockers where accidental release would be catastrophic.
- Institutional Facilities: Protecting massive cooking lines where manual activation points must be networked across large distances.
- Retrofit Modernization: Upgrading older mechanical pull systems to electrical supervision to meet modern building codes.
| Feature | Details |
|---|---|
| Manufacturer | Pyro-Chem (A Johnson Controls Brand) |
| Part Number | 551166 (Model RPS-E2) |
| Action Type | Dual-Action Pull Station |
| Switch Configuration | Single Pole Single Throw (SPST) |
| Construction | Heavy-Duty Die-Cast Metal |
| Finish | Fire Red Powder Coat |
| Compatibility | Kitchen Knight II / Monarch Series |
| Compliance | UL Listed, FM Approved, CSFM Listed |
The 6-Month Functional Audit
Every six months, a technician must perform a functional test. Using a silent test mode, the technician ensures the SPST switch sends the correct signal without firing the agent cylinders.
Path of Egress Accessibility
NFPA standards mandate that the 551166 be unobstructed and located along the natural path of exit. If a remodel has moved the exit, the path of egress accessibility must be re-verified.
Tamper Seal Verification
Most jurisdictions require a visual tamper indicator (break-tie). During maintenance, technicians replace these seals to provide the Fire Marshal with proof that the system remains untampered.
ADA Mounting Heights
To ensure accessibility, the RPS-E2 should be mounted between 42 to 48 inches from the floor. The unit fits a standard 2x4 electrical backbox, or a specific red metal backbox for surface-mounted industrial applications.
Can I use the RPS-E2 with an Ansul R-102 system?
No. While both brands are owned by Johnson Controls, the RPS-E2 is specifically listed for Pyro-Chem hardware. Mixing manufacturers is a significant code violation and will void your UL listing.
What is the difference between single and double action?
A single-action station is pull only. A dual-action pull station like the 551166 requires two steps (push then pull). This second step is the industry's primary defense against expensive accidental discharges in busy work zones.
Does the station come with a backbox?
The 551166 fits a standard 2x4 electrical backbox. For surface-mounted industrial applications, a specific red metal backbox is often used to maintain the die-cast structural integrity and aesthetic.
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