Hardware: Facilities Triage
Every unit in your portfolio is generating data right now — temperatures, compressor load, refrigerant pressure, acoustic signals that precede failure. That data sits unread until something breaks. The RAC changes that. It installs in-line between your existing thermostat and HVAC equipment, draws from the 24VAC supply already on your rooftop unit, and connects to FTL Cloud via built-in cellular. No separate power supply. No network configuration. No IT approval. Any HVAC technician can complete the install in under an hour. From that moment, your building can be put to work.
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A temperature reading alone tells you nothing. A temperature reading running two degrees above this unit's baseline for the past six hours, cross-referenced against its service history, is something worth knowing. Context is what turns raw data into a decision. The RAC captures the reading. FTL Cloud provides the context.
Smart thermostats manage comfort. Full BAS monitors equipment — but costs rule it out for most portfolios. The RAC sits in between. Compressor operation, refrigerant pressure, fan motor load, acoustic anomalies. Continuous monitoring, at a price point that works for every building you manage.
Installable in under an hour with cellular built in. The moment your technician completes the install, your building is already at work. The RAC handles its own connectivity, its own configuration, and its own power.
// SPECIFICATIONS
Input | Quantity | What it monitors |
|---|---|---|
HVAC terminal block (24VAC) | 8 | Thermostat pass-through and cloud override relay |
Temperature sensors (3.5mm TRS) | 4 | Supply, return, and auxiliary temperatures |
Current clamp inputs (3.5mm TRS) | 4 | Compressor and fan motor load |
Analog voltage inputs (3.5mm TRS) | 8 | Refrigerant high and low side pressure |
Onboard acoustic microphone | 1 | Mechanical fault detection via sound anomaly |
Onboard temperature sensor | 1 | Board ambient temperature |
Interface | Type | Purpose |
|---|---|---|
Power | 24VAC from RTU transformer | Draws from the existing unit -- no separate supply |
Cellular | Built-in | Primary uplink -- live from the moment of installation |
Satellite | Optional (Starlink) | For remote or off-grid locations |
LoRa | Long-range wireless | Collects data from Senstick sensors across wider areas |
Cloud | Field Technologies platform | Remote monitoring, control, and alerting |
Certifications: FCC Part 15 Class B · ICES-003 Class B · RoHS Compliant · UL 62368-1
Dimensions: 7.10 x 2.10 x 1.60 in (180 x 53 x 41 mm) · Indoor / NEMA 1 enclosure
Operating range: -40°F to 158°F (-40°C to 70°C)
// FAQ
The RAC monitors supply and return temperatures, compressor and fan motor current draw, refrigerant high and low side pressure, and uses an onboard acoustic microphone to detect sound anomalies that can indicate mechanical faults developing before they become failures. It also monitors board ambient temperature and collects data from Senstick wireless sensors across wider areas via LoRa.
If your buildings already have controls infrastructure, the Terminal integrates that data directly into FTL Cloud without replacing what's there. FTL reads what your system already generates and brings it into the same intelligence layer as buildings connected via RAC. The investment you've already made stays in place.
Yes. Built-in cellular is the primary uplink, drawing power from the existing 24VAC supply on the unit. Satellite connectivity is also available for remote or off-grid locations where cellular coverage is limited or unavailable.
One RAC per HVAC unit. For buildings with multiple rooftop units, a RAC installs on each one. Where a multi-zone or multi-unit configuration is in use, the Terminal acts as the site communications hub, aggregating data across the building and relaying it to the platform.
At launch, the RAC's primary coverage is HVAC. The REM extends monitoring to small refrigeration units and mini-splits. Additional verticals are covered through a phased expansion of FTL devices and third-party sensor integrations via the Terminal.
// Newsletter
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// Contact
Dave is FTL's Head of Sales. Have a direct conversation about whether FTL is right for you and what that could look like in practice.