Modernize the brains. Keep the pump.

When a retrofit makes sense

Not every controller problem warrants a retrofit, and not every retrofit needs to be a full equipment swap. The clearest signals that it's time to modernize the control side of an otherwise sound fire pump system:

• Legacy controller failing intermittently: original boards, contactors, or HMIs are end-of-life and replacement parts are no longer manufactured or are on long lead times.
• Building has been retrofitted and now needs pressure-limiting: campus-style pump arrangements, older municipal infrastructure, or new tie-ins create varying suction pressure the existing controller can't manage safely.
• Existing controller can't accept modern alarm monitoring: your AHJ or insurance carrier is now requiring more granular signals (running, phase reversal, low suction, transfer status) than the legacy unit can output.
• Insurance carrier pushing for VFD-based pressure limiting: variable speed pressure limiting is increasingly the carrier-preferred answer for systems that occasionally over-pressure the discharge piping.
• Site has switched to a generator backup: adding standby power means proper ATS integration, generator-start wiring, and rotation matching that older controllers were never specified for.

What we retrofit to

The right replacement controller depends on the building, the service the pump sees, and what the AHJ and carrier require. Common retrofit targets:

• Variable Frequency Drive (Variable Speed Pressure Limiting) controllers: Firetrol FTA3100 family, Tornatech GFX-VFD. Pressure output is actively limited, soft start and soft stop reduce water hammer, and the redundant power circuit means a VFD fault still allows across-the-line operation.
• Soft starters: for sites that need reduced starting current and gentler mechanical loading without the cost or complexity of a full VFD.
• Pressure-limiting diesel controllers (PLD engines): the diesel-side equivalent of a VFD. Mechanical means reduce pump speed to cap discharge pressure and prevent over-pressure events.
• Modern transfer switches: UL listed and FM approved for fire pump service, with proper voltage sensing, rotation matching, and generator-start signaling per current code.
• Modernized jockey pump controllers: the Firetrol FTA550 with restart timer fixes the rapid-cycling problem common on poorly placed sensing lines, and brings jockey alarms into the same monitoring envelope as the main controller.

What stays

In a controller retrofit, the pump body, the motor (in most cases; verify insulation class and starting method), the pump skid itself, the suction and discharge piping, and your existing building interface all stay in place. The work is concentrated at the controller cabinet, the upstream electrical service, and the alarm and monitoring connections leaving the room. That scope is what makes a retrofit a fraction of the cost of a full replacement.

How a retrofit project runs

A controller retrofit is a planned, coordinated outage, not a swap-and-go. The sequence we follow on every job:

• Site survey and current-state documentation: existing fault logs, alarm history, AHJ records, nameplate data on the pump and motor, and a verified electrical service walkdown.
• Spec and quote: you get a side-by-side comparison: replace the controller only vs. full pump-and-controller replacement, with line-item costs, lead times, and outage windows.
• Coordinated outage planning: we schedule the cutover with your AHJ, building management, fire watch provider, and any tenants or operations affected by the impairment.
• Cutover: typical 1 to 2 day site outage with proper staging, a temporary fire watch in place, and pre-built terminations to compress the work window.
• Recommissioning: full acceptance testing per NFPA 20 and NFPA 25: 6 manual plus 6 automatic starts at 5 minutes each, with voltage drop verified to not exceed 15% of rated during transfer, and complete documentation handed to the AHJ and your insurance carrier.

Code references

• NFPA 20 and NFPA 25: Recommissioning and acceptance testing are required after any major controller change. Both standards apply: NFPA 20 governs the installation, NFPA 25 governs the ongoing inspection, testing, and maintenance regime the new controller has to satisfy.
• NEC 695 (NFPA 70 Article 695): Any new electrical work (disconnects, conductor sizing, "Fire Pump Disconnect" labeling, locked-on requirements) must meet current Article 695 language, not the version in effect when the original controller was installed.
• NEMA enclosure ratings: Verify the enclosure environment. NEMA 2 is typical indoors; NEMA 3R, 4, or 4X is required for outdoor or corrosive locations, and the new controller must match or exceed the existing rating.

FAQs

Will I have to replace my pump too?

Almost never. The pump itself (body, impeller, casing) is mechanically simple and ages slowly. The controller is the bottleneck on most service calls we run. Unless the pump is undersized for current demand or shows verified mechanical wear, a controller-only retrofit is the right answer.

How long will my fire suppression be offline?

Planned outage, typically 1 to 2 days. We coordinate the impairment with your AHJ and building management ahead of time, stage the new equipment and pre-built terminations, and cover the window with a fire watch. Talk to us about scheduling well before the outage so the AHJ paperwork is in place.

Does a retrofit require recommissioning?

Yes. Full acceptance testing per NFPA 20 and NFPA 25 is required: manual and automatic start sequences, churn and flow tests, voltage drop verification, and alarm signaling end-to-end. We document the entire recommissioning and hand the package to the AHJ and your insurance carrier.

Related services