Deep monitoring and control for the office air handler that feeds an all-air floor — supply-air temperature compliance, duct static pressure (reset to follow the VAV boxes), fan/VFD performance, filter differential pressure, and chilled-water valve/coil performance, plus economizer effectiveness where an outdoor-air damper exists. Control scales by tier. Installs and operates the plant controller — it does not replace defective field devices.
Impact: Turns the air handler from a floor-wide single point of failure into a monitored and operated asset — a lost discharge, an over-pressurized duct burning fan energy, a fouling coil in low-ΔT syndrome, a loaded filter, or a stuck economizer is caught and, at Optimized, corrected before an entire floor loses comfort or a season of fan energy is wasted. Packages an AHU as a repeatable 'pro' bundle instead of a proposal re-derived each time.
What it solves: The air handler is the machine behind every VAV box on an all-air floor: it conditions and moves the supply air, holds duct static so each box can pull the air it calls for, and converts chilled water into cooling at its coil. When the handler drifts, the whole floor drifts with it. This add-on layers deep AHU monitoring and control on the base product: supply-air temperature compliance (the discharge every box receives), duct static pressure reset to follow the worst-case VAV box (the single largest fan-energy lever on the floor — the AHU end of the loop the VAV add-on reads at the terminal end), fan and VFD performance, filter differential pressure for condition-based changes, and chilled-water valve and coil performance. Where the handler has a modulating outdoor-air damper, economizer effectiveness is included. Control scales with the tier: deep visibility and ad-hoc command at Essential; managed 24/7 alarm ops (triage, remote resolution, dispatch, RCA) at Managed; proactive device-level control at Optimized — Keedian commands the supply-air sequence, the static-pressure reset, fan speed, and the chilled-water valve within their authority, with an audit trail. The add-on installs and operates the plant controller (a Siemens Desigo PXC5.E24 plant controller, replacing dead LonTalk legacy controllers) and its sensing and actuation; it does not include replacing field devices (a failed VFD, a leaking valve, a fouled coil) found defective — those are scoped case by case.
These are the operational metrics this add-on monitors and alarms on. Keedian surfaces them and, where the contract includes managed service, triages them; acting on the physical asset stays with you and your vendors.
The core metrics are summarized below. Full methodology, thresholds, diagnosis steps, and escalation criteria are in the Metrics Catalog.
Temperature difference a cooling stage develops across its heat-transfer surface — return vs supply air on an RTU or AHU, chilled-water return vs supply across a chiller's evaporator, or entering vs leaving water on a cooling tower. Measures how effectively the equipment moves heat. A declining or persistently low ΔT is the earliest remote signal of degradation — fouled coils or tubes, low flow, or a failing charge — often visible weeks before a comfort failure or breakdown.
Full detail → Metrics CatalogAverage compressor hours per day while actively running. The baseline signal for operational health — flags equipment running too long (degraded efficiency or capacity issues) and too short (scheduling or data problems) before the pattern becomes a larger issue.
Full detail → Metrics CatalogThe share of run-time the air handler held its supply-air (discharge) temperature at the value its sequence commanded — including any supply-air-temperature reset. Supply air is the product the AHU delivers to every box it feeds, so a handler that cannot hold its discharge setpoint starves an entire floor at once. The air-handler-level outcome metric behind every VAV box downstream.
Full detail → Metrics CatalogWhether the supply (and return) fan and its variable-frequency drive deliver the airflow and static the floor needs at the fan speed and power they should — speed and power read against the air actually moved. A fan running fast and drawing power for little airflow signals a slipping belt, a fouled wheel, a failing bearing, or a VFD fault; a VFD in bypass or faulted removes the reset's ability to save energy. The health-and-efficiency signal for the AHU's largest moving part.
Full detail → Metrics CatalogEach metric includes definition, detection logic, diagnosis steps, recommended actions, escalation criteria, and prevention controls. Thresholds are reference values to be calibrated per client.
View Metrics Catalog →The handler holds its supply-air discharge, its duct static resets to the lowest value the worst-case box needs, the fan and VFD run efficiently, filters are changed on condition, the coil and valve convert chilled water to cooling as designed, and — where an economizer exists — free cooling is captured when conditions allow. Control depth scales from visibility (Essential) to proactive device command (Optimized). Expected (pending validation) — offices have no named Keedian reference deployment yet.
Model A, scoped per unit: a Siemens Desigo PXC5.E24 plant controller (replaces the legacy LonTalk controller), supply/return/mixed-air temperature sensors (QAM), a duct static-pressure sensor, filter differential-pressure switches or sensors, the chilled-water valve and actuator, VFD integration, and a freezestat; optional fan motor current / vibration monitoring. Under Model B the same points are read from the BMS where exposed. No sensor-by-sensor cost modeling — instrumentation is scoped per air handler.
At Managed, the AHU-metric alarms are run on the same 24/7 basis as the rest of the contract — triaged, resolved remotely where possible, dispatched where not (including condition-based filter changes), and closed with RCA. At Optimized, Keedian additionally drives the handler proactively (supply-air sequence, static reset, fan speed, and valve command within authority). Replacing a defective field device — a failed VFD, a leaking valve, a fouled coil — is scoped as a field-services item, not part of the managed fee.
Add-on charges apply on top of the base subscription. This page states which charge components apply; the product subscription lives in the pricing catalog.