Jockey Pump Controller
The Pressure Manager

It Is Not a Fire Pump Controller

Unlike the fire pump controller, the jockey pump controller is a standard motor starter. It's typically a combination magnetic contactor and overload relay in a NEMA 2 / IP55 enclosure, with a pressure transducer (or a pair of mechanical pressure switches on older units) wired to a small sensing line tapped off the system. It is listed to UL 508A (industrial control panels), not UL 218 (fire pump controllers). It is allowed to trip on overload — the opposite rule from the fire pump controller.

Why the different rules? Because the jockey pump is not protecting life safety directly. If the jockey trips, the fire pump picks up slack. If the fire pump trips during a fire, the system fails. NFPA 20 reserves the strict locked-in-against-overload rules for devices whose failure would cause a sprinkler system to stop working. The jockey controller gets the normal NEC Article 430 motor-control rules — NOT the stricter Article 695 rules that govern fire pumps.

Inside the Box — Standard Features

Modern jockey controllers (Tornatech JP-series, Firetrol FTA-550J, Eaton, Metron) all converge on a similar feature set Source 4:

Tornatech JP-Series — A Representative Model Ladder

Tornatech publishes one of the most complete jockey controller product ladders. Use it as a template for understanding how most manufacturers organize their offerings Source 4:

Firetrol (FTA-550J baseline, FTA-1100J higher-current), Eaton/Cutler-Hammer, Metron, and Joslyn Clark all publish a similar range with their own model codes. The underlying rules — UL 508A listing, single controller per jockey, integrated ATS as an option for dual-power sites — are consistent across manufacturers.

Setpoints and Logic

Inside the enclosure, either two pressure switches or (on modern units) a single pressure transducer with electronic setpoint logic controls pump operation:

• Start switch / cut-in pressure: closes contacts / triggers logic when pressure falls below the start set-point, energizing the contactor and starting the jockey motor.
• Stop switch / cut-out pressure: opens contacts / triggers stop-logic when pressure rises to the stop set-point (typically 10 psi higher), de-energizing the contactor AFTER the minimum-run timer has elapsed.
• Minimum-run timer: once started, the jockey runs for at least N seconds (typically 60) regardless of how quickly pressure is restored. This prevents motor short-cycling and is the single most important protective setting in the controller.

Older mechanical two-switch arrangements are still common and field-serviceable with a flathead screwdriver. Modern electronic transducer controllers (Tornatech ViZiLT / iPD+, Firetrol with PTC, Metron) give you live digital pressure display, adjustable setpoints through the menu, and diagnostic counters — at the cost of more electronics to eventually replace.

Enclosure Ratings — Pick the Right Box

All major manufacturers (Tornatech, Firetrol, Eaton) offer every enclosure rating on the same controller platform — so you choose internals separately from the box. Order a NEMA 4X for an outdoor coastal site without re-engineering the control logic.

Troubleshooting

Commissioning & Annual Verification

During commissioning or the annual fire pump flow test, verify the jockey controller:

1. H-O-A in Auto when you arrive. Document the position you found it in.
2. Setpoints correct — cut-out at main pump churn + 10 psi, cut-in at cut-out − 10 psi, main pump start at cut-in − 5 psi minimum.
3. Minimum-run timer ≥ 60 seconds.
4. Pump start counter reading recorded — compare to previous inspection to verify cycling is in range.
5. Elapsed time meter reading recorded.
6. Overload relay tested per manufacturer instructions (some units have a test pushbutton).
7. Transducer accuracy checked against a calibrated analog gauge on the sensing line.
8. Manual start / stop pushbuttons tested from the door.
9. If equipped with ATS (DJP / DJD): simulate a utility loss and verify the controller switches to alternate power within the specified transfer delay.

Frequently Asked Questions

References