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A fire protection system relies on more than just pumps and sprinkler heads. Behind the scenes, controllers determine when pumps start, how they operate, and how the system responds to changing pressure conditions.
Two controllers often found in the same fire pump room are the jockey pump controller and the fire pump controller. Although both respond to pressure changes, they serve very different purposes.
A jockey pump controller maintains normal system pressure and handles minor pressure losses. A fire pump controller starts and controls the main fire pump when the system experiences a significant pressure drop that indicates actual water demand.
Understanding the difference is important when designing, installing, servicing, or upgrading a fire protection system.
What Is a Jockey Pump Controller?
A jockey pump controller is designed to operate a jockey pump, also called a pressure maintenance pump. Its primary job is to maintain the pressure within a fire protection system when there is no significant water flow.
Fire sprinkler piping can experience small pressure losses for several reasons. Minor leakage, temperature changes, maintenance activities, or gradual pressure variations can cause the system pressure to fall.
Instead of allowing every small pressure drop to start the main fire pump, the jockey pump restores the pressure.
The controller monitors system pressure and starts the jockey pump when pressure reaches its predetermined cut-in point. Once pressure is restored, it stops the pump at the configured cut-out point.
NFPA 20 describes the jockey pump as a pressure maintenance or make-up pump intended to maintain system pressure when the system is not flowing water.
In simple terms, the jockey pump controller handles pressure maintenance.
What Is a Fire Pump Controller?
A fire pump controller is responsible for controlling the main fire pump that supplies water during a fire event or another significant demand condition.
When water begins flowing through sprinkler heads, standpipes, hose stations, or other fire protection equipment, system pressure can drop substantially. If the pressure falls to the fire pump controller's start setting, the controller automatically starts the main fire pump.
Fire pump controllers are specifically designed for fire protection applications and are built around requirements established by NFPA 20. Depending on the system, they can control electric motor driven or diesel engine driven fire pumps. Listed fire pump controllers are available with features such as automatic starting, monitoring, alarms, event logging, and power transfer equipment where applicable.
The main objective is not simply to maintain pressure.
It is to make sure the fire pump is ready to deliver the required water supply when the system needs it.
Jockey Pump Controller vs Fire Pump Controller
The easiest way to understand the difference is to look at what each controller is designed to accomplish.
| Feature | Jockey Pump Controller | Fire Pump Controller |
|---|---|---|
| Controls | Jockey pump | Main fire pump |
| Primary purpose | Maintain system pressure | Provide required fire flow |
| Typical trigger | Minor pressure drop | Significant pressure drop |
| Pump size | Usually smaller | Typically much larger |
| Main function | Pressure maintenance | Fire protection water delivery |
| Controller requirements | Appropriate industrial/controller requirements | Fire pump specific requirements |
| Typical operation | Frequent short cycles | Starts during actual demand or testing |
| System role | Prevents unnecessary fire pump starts | Delivers water during fire demand |
The two controllers therefore work together rather than compete with each other.
How Do the Controllers Work Together?
Think of the fire protection system as having two layers of response.
The jockey pump handles the small pressure changes.
The fire pump handles the serious ones.
For example, suppose a sprinkler system normally operates at a stable pressure. A small pressure loss occurs because of a minor leak.
The pressure drops to the jockey pump controller's start setting.
The jockey pump starts.
It restores system pressure and shuts down once the pressure reaches its stop setting.
Now imagine a sprinkler activates during a fire.
The water demand is much greater than the jockey pump can handle. System pressure continues to fall despite the jockey pump operating.
When the pressure reaches the fire pump controller's start setting, the main fire pump starts.
This staged response helps prevent the main fire pump from starting every time the system experiences a small pressure fluctuation.
NFPA technical material discusses the use of different pressure settings between jockey and fire pump controllers to help prevent unintended fire pump starts and nuisance conditions.
Why Are Jockey Pump Controllers Important?
Without an appropriately designed jockey pump arrangement, minor pressure losses could repeatedly trigger the main fire pump.
That is undesirable for several reasons.
First, unnecessary fire pump starts can increase mechanical and electrical wear. Second, repeated operation can make system maintenance more demanding. Third, frequent starts can create confusion when operators are trying to determine whether the system is responding to an actual fire protection demand.
A jockey pump provides a smaller, controlled method of restoring pressure.
Modern jockey pump controllers can include features such as adjustable cut-in and cut-out pressure settings, manual and automatic operation, pressure monitoring, motor overload indication, pump start counters, elapsed time meters, and timers.
The exact configuration should always be based on the fire protection system design, applicable codes, equipment listings, and the requirements of the authority having jurisdiction.
Why Is a Fire Pump Controller Different?
A fire pump controller has a much more critical responsibility.
During a fire, the controller must initiate fire pump operation when the system requires it and provide the appropriate control and monitoring functions for the fire pump installation.
Because the consequences of failure can be severe, fire pump controllers are subject to fire protection specific requirements and listings.
For example, listed electric fire pump controllers are manufactured for fire pump service and can incorporate different motor starting methods, monitoring functions, and automatic transfer switch configurations depending on the application.
Diesel engine fire pump controllers have their own specialized control requirements because the prime mover, starting system, batteries, fuel system, and monitoring requirements differ from those of an electric motor driven pump.
This is one of the biggest differences between the two controller types.
A jockey pump controller primarily manages a relatively small pressure maintenance pump. A fire pump controller manages equipment that forms a critical part of the building's fire suppression water supply.
Are Jockey Pump Controllers and Fire Pump Controllers Interchangeable?
No.
Although both controllers monitor pressure and can automatically start their associated pumps, they are not interchangeable components.
A jockey pump controller is selected for the jockey pump's motor, electrical characteristics, operating requirements, and pressure maintenance function.
A fire pump controller must be specifically suitable for the fire pump application and comply with the applicable requirements, listings, approvals, and installation conditions.
Using the wrong controller can affect system performance, compliance, reliability, and inspection acceptance.
It is also important not to assume that a standard industrial motor controller can simply replace a listed fire pump controller. Fire protection equipment has application specific requirements that must be considered during system design and installation.
What Should You Consider When Selecting a Controller?
Choosing the right controller requires more than matching voltage and horsepower.
Consider:
Pump type: Determine whether the controller operates a jockey pump, electric fire pump, or diesel driven fire pump.
Motor requirements: Voltage, phase, horsepower, starting method, and other electrical characteristics must match the application.
Pressure settings: Jockey pump and fire pump start and stop settings must be coordinated correctly.
System design: The controller should support the operating requirements of the complete fire protection system.
Listings and approvals: Verify that the equipment has the required listing or approval for its intended application.
Environmental conditions: Enclosure type, temperature, moisture, and installation location can affect controller selection.
AHJ requirements: Local authorities and project specifications may impose additional requirements beyond the basic equipment selection.
Working with an experienced fire pump professional can help ensure that the controller, pump, piping, power supply, and system controls operate as one properly coordinated system.
The Bottom Line
A jockey pump controller and a fire pump controller may sit next to each other in the same pump room, but they have completely different jobs.
The jockey pump controller maintains pressure during normal conditions and responds to minor pressure losses.
The fire pump controller starts and controls the main fire pump when significant pressure loss indicates a genuine demand for fire protection water.
Together, they create a coordinated response. The jockey pump handles routine pressure maintenance, while the main fire pump remains available for the high-demand conditions it was designed to handle.
For any fire pump installation, controller selection should be based on the complete system design, applicable NFPA requirements, equipment listings, manufacturer specifications, and local AHJ requirements.
Need Help With Your Fire Pump System?
Choosing the right controller is only one part of designing a dependable fire protection system. The pump, controller, pressure settings, power supply, piping, and monitoring equipment all need to work together.
Callaghan Pump & Controls can help you evaluate your fire pump and jockey pump requirements and identify the right control solution for your application.
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