Proactive maintenance to maximize energy performance and prevent breakdowns
At AirGreen , we know that in the retail sector, every degree of comfort and every minute of HVAC system operation counts. Recently in Longueuil , our team performed comprehensive preventative maintenance on a Trane commercial rooftop unit installed on the roof of a 24/7 convenience store . This type of intervention perfectly illustrates our approach: combining technical performance, safety, energy efficiency, and business continuity .
Context and objectives of the mandate
The owner of the convenience store had noticed several signs of wear and tear on his system:
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Temperature fluctuations near refrigerated display cases;
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An abnormal blower noise ;
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And an increase in electricity costs over the past few months.
Given the importance of maintaining a stable temperature for products and customer comfort, he called upon AirGreen for a thorough inspection and complete maintenance of the equipment.
The objective: to avoid a breakdown during periods of high demand , to restore the machine's original performance , and to extend its useful life .
Initial diagnosis and findings
Before taking any action, our technicians carried out a complete functional analysis :
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Static pressure and airflow measurements to assess distribution;
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Electrical check (compressor amperage, voltage, connections);
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Visual inspection of filters, coils, fans and drains;
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Checking the refrigeration cycle to verify the refrigerant charge.
Our observations:
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The condenser and evaporator coils were clogged , limiting heat exchange;
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The air filters had not been replaced for over a year;
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A blower belt had cracks and was misaligned;
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The condensate drain was partially blocked, risking an internal leak;
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And the ambient temperature sensor was sending an inaccurate reading, causing short cycles.
Technical solution and intervention steps
Our AirGreen experts implemented a complete preventative maintenance , following ASHRAE 180 and CSA B52 protocols for commercial HVAC units.
1. Cleaning and disinfection
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Complete dismantling of the panels for thorough cleaning of the coils using a biodegradable solution;
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Vacuuming and washing the fan compartment ;
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Disinfection of the condensate tray and complete cleaning of the drain;
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Cleaning the air intake grille to promote better IAQ (indoor air quality).
2. Mechanical Maintenance
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Replacing MERV-8 air filters with high-efficiency MERV-13 models;
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Alignment and tensioning of the blower belt ;
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Lubrication of all bearings;
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Checking the security of all mechanical fasteners and fairing screws.
3. Refrigeration and electrical check
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Reading of suction and discharge pressures , with adjustment of the refrigerant according to the manufacturer's nominal values;
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Inspection of the wiring to detect any signs of overheating;
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Compressor start-up test and peak current analysis;
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Replacement of the faulty temperature sensor .
4. Control calibration and BMS optimization
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Reconfiguration of the programmable thermostat , with time slots adapted to the opening of the business;
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Setting the setpoint to maximize comfort without overconsumption;
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Verification of the operating sequence (heating → ventilation → cooling).
Construction site procedures and safety
The intervention was carried out early in the morning , before the repair shop opened, in order to avoid any disruption.
Our technicians implemented a complete lockout plan , installed a secure perimeter on the roof , and used a CSA Z259 certified safety harness .
Each step was documented in the AirGreen maintenance report , including photos, measurements, and follow-up recommendations.
Results obtained
The benefits were immediate upon recommissioning:
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15% reduction in monthly electricity consumption ;
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Increased thermal stability , maintaining the temperature within ±1 °C in the sales area;
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Noise level reduced by 30% , improving customer comfort;
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Airflow restored to 100% according to the original design;
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Improved indoor air quality , with CO₂ levels compliant with ASHRAE 62.1 standards.
Thanks to these results, the convenience store manager was able to reduce emergency calls and optimize the overall energy performance of his business.
Continuous maintenance program
Following this intervention, AirGreen implemented an annual preventive maintenance contract , including:
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Two seasonal visits (spring and autumn);
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Remote monitoring of critical temperatures and pressures by building management systems (GTB) ;
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Planned replacement of filters and belts ;
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24/7 assistance in case of breakdown.
This preventative approach helps ensure equipment reliability , protects the owner's investment , and eliminates costly operational interruptions .
Compliance, safety and sustainability
The maintenance was carried out in full compliance with ASHRAE and RBQ standards :
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ASHRAE 180 – Preventive Maintenance of HVAC Systems;
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CSA B52 – Safety of mechanical refrigeration systems;
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Occupational Health and Safety Regulation (OHSR) ;
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RBQ – Chapter I of the Quebec Building Code .
All cleaning products used were VOC-free and biodegradable , respecting the client's environmental commitment and the municipal requirements of Longueuil.
Return on investment
The owner quickly saw a return on investment (ROI) of less than one year , thanks to:
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Estimated energy savings of $1,200/year ;
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An 80% reduction in emergency interventions ;
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And an increase in the unit's lifespan estimated at an additional 5 years .
AirGreen: your commercial HVAC partner in Longueuil and Greater Montreal
With over a decade of experience, AirGreen supports businesses and institutions in Montreal, Laval, Longueuil, the North Shore and the South Shore in the maintenance, modernization and design-construction of commercial HVAC systems .
Our mission: to offer sustainable, efficient and compliant solutions , so that your facilities operate continuously, without unforeseen problems.