25%
average HVAC energy cost reduction from structured preventive maintenance — clean condenser coils restore heat transfer efficiency, correct refrigerant charge eliminates compressor overcycling, and calibrated controls eliminate heating/cooling conflicts. On a 150,000 sq ft office building spending $380,000 per year on HVAC energy, that is $95,000 saved annually from PM tasks that cost a fraction of that amount.
Commercial building HVAC spans six system types — each with its own failure modes, service intervals, and energy performance indicators. A chiller PM programme looks nothing like a VRF split system maintenance schedule. OxMaint manages all six with system-appropriate PM templates and individual asset condition records.
AHU
Air Handling Units
ASHRAE 62.1 · SMACNA
Filter changes, belt and drive inspection, coil cleaning, drain pan inspection, damper actuator function, fan bearing lubrication, and ductwork integrity — with seasonal changeover PMs and individual unit records.
Filter change — per differential pressure trigger
Belt tension and drive condition — monthly
Coil cleaning — annual or per fouling indicator
✓ ASHRAE 62.1 records · Filter change history
CHR
Chillers
ASHRAE 15 · OEM service manual
Refrigerant charge verification, condenser and evaporator tube cleaning, oil sample and analysis, approach temperature trending, compressor log, vibration monitoring, and annual full-load performance test.
Refrigerant charge — quarterly verification
Approach temperature — monthly trending
Oil sample analysis — semi-annual per unit
✓ ASHRAE 15 refrigerant log · Oil analysis records
CTW
Cooling Towers
ASHRAE 188 · CTI standards
Basin cleaning, fill inspection, drift eliminator condition, fan and gear drive service, water treatment programme, Legionella risk management per ASHRAE 188, and nozzle inspection — per individual tower.
Basin cleaning — monthly during season
Water treatment log — per dosing event
Legionella risk assessment — annual ASHRAE 188
✓ ASHRAE 188 WMP records · Water treatment log
VRF
VRF / VRV Systems
OEM service manual · EPA 608
Outdoor unit coil and fan service, indoor unit filter and drain cleaning, refrigerant leak check, system performance monitoring via OEM diagnostic port, and outdoor unit vibration check — per zone.
Indoor unit filter clean — quarterly per zone
Refrigerant leak check — annual per circuit
OEM diagnostic data read — semi-annual per ODU
✓ EPA 608 refrigerant log · Zone PM records
FCU
Fan Coil Units
OEM schedule · ASHRAE 62.1
Filter cleaning, coil condition, drain pan inspection and clean, motor bearing check, control valve function, and condensate drain test — tracked per individual FCU with floor-by-floor PM scheduling.
Filter clean — monthly per unit
Drain pan and condensate — quarterly flush
Control valve function — annual per unit
✓ FCU PM history · Per-floor compliance records
BMS
BMS / Building Controls
ASHRAE 135 · OEM support
Sensor calibration, controller software updates, setpoint verification, alarm response review, trend data analysis, valve and damper actuator function tests, and annual full-system commissioning check.
Sensor calibration — annual per zone
Setpoint and schedule review — seasonal
Alarm response log — monthly review
✓ BMS calibration records · Controls PM log
Five degradation mechanisms account for over 93% of unplanned commercial HVAC failures. Refrigerant system faults and heat transfer fouling together represent more than half of all chiller and AHU failures — both are directly preventable through structured PM. OxMaint prioritises your highest-risk HVAC assets automatically.
Six technology integrations connect HVAC condition data to maintenance action — from AI analytics that detect compressor efficiency decay months before failure, to BMS integration that auto-generates filter work orders when differential pressure crosses its threshold. Connect your building HVAC through OxMaint.
AI Predictive Analytics
5× earlier
Chiller compressor fault detection
AI analyses energy consumption patterns, approach temperature trends, and vibration data — flagging developing chiller compressor faults 3–6 months before failure.
Digital Twin
3–5 yr forecast
Chiller end-of-life capital planning
Digital twin models chiller compressor and heat exchanger degradation — giving facilities managers 3–5 year capital replacement forecasts before emergency purchasing pressure forces poor decisions.
BMS Integration
Auto trigger
BMS alarms become work orders instantly
High supply air temperature, low chilled water flow, filter differential alarm — every BMS threshold crossing auto-generates a priority work order in OxMaint with asset and alarm data pre-populated.
AI Camera Vision
Real-time
Coil fouling and drain pan condition detection
Camera inspection of AHU coil surfaces and cooling tower fill detects fouling levels and biological growth — replacing subjective visual inspection with quantified condition assessment.
IoT Sensors
24/7
Continuous temperature, pressure, and energy data
Chilled water temperature, condenser pressure, filter differential, and power meters feed OxMaint continuously — energy performance trending shows the impact of every PM event in real time.
SAP Integration
Pre-ordered
Filters and belts ordered before stock runs out
OxMaint PM forecasts trigger SAP purchase orders for filters, belts, refrigerant, and lubricants — consumables on hand before the service is due, not sourced reactively at emergency rates.
Six regulatory and owner compliance obligations govern commercial HVAC maintenance. Missing an EPA 608 refrigerant log or an ASHRAE 188 water treatment record creates liability exposure that survives building sales and insurance claims. OxMaint tracks every obligation with advance reminders and compliance packages ready for auditor review in under 15 minutes.
Q1How does OxMaint integrate with our existing BMS to generate HVAC work orders?▼
OxMaint connects via API to major BMS platforms — every alarm event or threshold crossing auto-generates a work order with the asset identity, alarm value, and assigned technician pre-populated and ready to dispatch.
Q2How does OxMaint track chiller energy performance and approach temperature?▼
OxMaint stores approach temperature readings per service event and calculates trend rate — generating a condenser cleaning work order when the trend indicates fouling has moved efficiency outside the target band.
Q3Can OxMaint manage the ASHRAE 188 water management programme for cooling towers?▼
Yes — OxMaint schedules and records all ASHRAE 188 WMP tasks: monthly basin cleaning, water treatment dosing logs, biological count records, and annual risk assessment — with compliance packages for building owner review.
Q4How quickly can OxMaint be configured for a multi-system HVAC programme?▼
Most facilities complete HVAC asset configuration — all system types loaded, PM intervals set, and BMS integration active — within 14 days using OxMaint's HVAC asset template library.
Q5What is the typical energy saving after implementing OxMaint HVAC PM?▼
Buildings typically see 15–25% HVAC energy reduction within the first year — primarily from restored heat transfer efficiency in chillers, correct refrigerant charge, and clean AHU coils and filters.
