Remote fault diagnosis
Resolve issues over the air before dispatching a technician, reducing field service cost per incident across the installed base.
HVAC Remote Monitoring System
When equipment reaches customers without connectivity, every fault diagnosis starts with a field visit, every warranty investigation begins without data, and engineering teams design the next generation without real-world performance insight. Melqart Systems provides HVAC OEMs with a production-ready edge connectivity layer: remote diagnostics, fleet telemetry, and OTA management, without building IoT infrastructure in-house.
The OEM Connectivity Gap
Connected equipment is becoming standard, and field service teams need operational data.
HVAC buyers increasingly expect remote monitoring, proactive service, and energy reporting as standard, not as add-ons. OEMs that cannot offer connectivity risk losing evaluations to competitors who can demonstrate a service portal at the sales stage. The alternative, building IoT in-house, means 18–24 months of engineering effort on cloud infrastructure, SIM management, and OTA pipelines that have nothing to do with your core product. Melqart Systems provides the complete connectivity layer: edge hardware that integrates with your existing controller architecture, cellular-primary backhaul that works without customer IT involvement, and a normalized API your service team or portal can connect to immediately.
No customer IT dependency
Cellular-primary connectivity that works in any facility without network access requests, VPNs, or IT approval processes.
Fleet performance data
Real-world operating data from every deployed unit, for warranty validation, product improvement, and engineering decisions.
OTA fleet management
Push firmware updates, configuration changes, and diagnostic commands to units in the field at scale. No site visits required.
The challenge
Where current approaches fall short
Every fault diagnosis starts with a field visit
Without remote access to deployed units, your service team investigates every callout without data, dispatched before the fault is understood, often with the wrong parts. A single unnecessary field visit costs €200–500 or more. Across a fleet of thousands of units, that compounds into millions in avoidable service cost every year.
Connected service platforms are becoming a standard differentiator
Daikin Connect, Carrier ConnectPlus, Trane Tracer: the major brands already offer connected service platforms. Buyers now ask for remote monitoring in procurement specifications. OEMs without it risk losing evaluations to competitors who can demonstrate live unit data and proactive service at the sales stage.
Building IoT in-house diverts engineering from your core product
A production-ready IoT stack (edge firmware, cloud ingestion, SIM management, OTA pipeline, and security hardening) requires a dedicated team and 18–24 months at minimum. That engineering capacity is then unavailable for the core product: refrigeration cycles, efficiency improvements, and regulatory compliance.
Architecture
How It Integrates With Your Equipment
We connect to your existing HVAC controller via its native protocol interface, process data at the edge, and deliver it to your service platform, without changes to your controller architecture.
- 01
Your HVAC Controller
Modbus RTU/TCP, BACnet, RS485
- 02
Edge Node
Protocol bridge + onboard logic
- 03
Cellular Backhaul
LTE/4G, multi-carrier SIM
- 04
Your Service Platform
Normalized API or white-label portal
What's included
What You Get
A complete connectivity layer you can embed in new product lines or offer as a retrofit: hardware, integration support, connectivity infrastructure, and data platform, production-ready.
Native Protocol Integration
Connects to your existing HVAC controller via Modbus RTU/TCP, BACnet IP/MSTP, or RS485. No redesign of your controller PCB or controller firmware required.
Cellular-Primary Connectivity
LTE/4G with multi-carrier SIM. Connects in any customer facility without IT network access. No VPNs, no firewall requests, no IT approvals needed.
OTA Fleet Management
Push firmware updates, configuration changes, and diagnostic commands to every unit in the field. Manage your entire deployed fleet from a single dashboard without site visits.
Normalized Data API
Standardized telemetry output regardless of the underlying controller protocol or model. Your service portal or engineering team gets clean, structured data from every unit in every market.
Technical specifications
Protocol Support
Modbus RTU/TCP, BACnet IP/MSTP, RS485, M-Bus. Integrates with your existing controller interface. No changes to your PCB or controller firmware.
Connectivity
Cellular-primary (LTE/4G) with multi-carrier SIM for global deployment. No dependency on customer IT network. Operates in any facility, in any market.
OTA & Remote Management
Firmware updates, configuration deployment, and remote diagnostics pushed to the entire fleet. Signed OTA delivery with rollback support. No on-site access required for software changes.
Data Output
MQTT, REST API, and OPC-UA. Normalized data schema: consistent structure regardless of underlying controller brand or model. Ready to connect to your service portal on day one.
Hardware
DIN-rail mount, IP54 enclosure suitable for installation in HVAC electrical compartments. Operating temperature: -20°C to +60°C. CE marked.
OEM & White-Label
Hardware and firmware white-labeling available. Global cellular certifications for major markets. Serial production support with cloud provisioning at scale.
Applications
Use cases and industries
Commercial Chillers
Remote performance monitoring and fault diagnosis for packaged and split chiller units: EER/COP tracking, compressor diagnostics, and refrigerant circuit health from headquarters.
Air Handling Units
Fan, filter, coil, and damper monitoring for AHUs in commercial and industrial installations: filter differential pressure, coil fouling detection, and airflow deviation alerts.
VRF and Heat Pump Systems
Fleet telemetry for variable refrigerant flow and heat pump product lines: remote commissioning support, performance validation, and fault event logging across the installed base.
Rooftop Units
Remote diagnostics and energy metering for RTUs across commercial rooftop installations: reduce unnecessary field visits and validate performance post-installation.
Fan Coil Units
Zone-level monitoring for fan coil installations in hotels, offices, and apartment buildings: setpoint tracking, valve diagnostics, and runtime accumulation data.
Industrial Ventilation and Process Cooling
Connectivity for industrial ventilation and process cooling equipment in manufacturing and food production environments where uptime is process-critical.
Results
Key outcomes
“From disconnected field equipment to a remotely visible, remotely serviceable product fleet.”
- Remote fault diagnosis: resolve issues without dispatching a technician.
- No customer IT dependency: cellular-primary connectivity that works in any facility.
- OTA fleet management: firmware and configuration updates at scale, no site visits.
- Normalized API: clean telemetry your service portal connects to immediately.
- Fleet performance data for warranty validation and product engineering decisions.
- White-label ready: present connectivity as your own product feature.
Related solution clusters
Solution datasheet
HVAC monitoring system
Remote diagnostics and fleet data from compatible HVAC units over Modbus or BACnet, reported on the unit's own cellular link without the building's IT.
MS-DS-HVC-2026-55 · PDF · 6 pages · English
Frequently asked questions
01How can an HVAC OEM add remote monitoring without building IoT in-house?
Melqart Systems provides an edge node that connects to your existing HVAC controller over Modbus RTU/TCP, BACnet IP/MSTP, RS485 or M-Bus, with no changes to your PCB or controller firmware. It delivers normalized telemetry to your service platform over cellular.
02Does remote HVAC monitoring depend on the customer's IT network?
No. Connectivity is cellular-primary (LTE/4G) with a multi-carrier SIM, so the unit reports from any facility in any market without involving the building owner's IT department.
03Can we push firmware updates to installed HVAC units?
Yes. Firmware updates, configuration changes and remote diagnostics are pushed to the whole fleet with signed OTA delivery and rollback support. No site visit is needed for software changes.
04Can the connectivity be white-labeled as our own product feature?
Yes. Hardware and firmware white-labeling is available, and data is exposed over MQTT, REST API and OPC-UA in a normalized schema your service portal can use from day one.
05What are the edge hardware specifications?
A DIN-rail mounted unit in an IP54 enclosure for HVAC electrical compartments, rated from -20°C to +60°C and CE marked.
Ship your next product generation connected, without building the IoT stack in-house.
Melqart Systems integrates with your controller architecture, handles the connectivity infrastructure, and gives your service team remote visibility from day one.