Frequently Asked Questions

A hot water boiler heats water below the boiling point to feed a network of radiators or radiant floor systems. A steam boiler produces pressurized steam, used for heating or industrial processes. Maintenance and safety requirements differ significantly.

Source: Hot Water and Steam Boilers

Decreased efficiency, rising gas consumption, unusual noises, water leaks, unstable or yellow flame, recurring error codes, and difficulty maintaining the set temperature are common indicators.

Source: Hot Water and Steam Boilers

A well-maintained commercial boiler has a typical lifespan of 20 to 30 years. A regular preventive maintenance program and proper water treatment are the key factors in longevity.

Source: Hot Water and Steam Boilers

Rooftop units (RTUs), air-cooled and water-cooled chillers, commercial heat pumps, VRV/VRF systems, air handling units (AHUs), and commercial split systems.

Source: Commercial and Industrial Air Conditioning

Semi-annual maintenance is recommended: one visit before the heating season and one before the cooling season. High-use environments may require quarterly visits.

Source: Commercial and Industrial Air Conditioning

Yes. Our technicians perform refrigerant recharges in compliance with current regulations. We also verify circuit integrity before any recharge to prevent recurring leaks.

Source: Commercial and Industrial Air Conditioning

Boiler failures, burner shutdowns, gas leaks detected by safety systems, winter heating breakdowns, air conditioning failures during heat waves, critical pump failures, and any mechanical breakdown that threatens occupant comfort or safety.

Source: 24/7 Emergency Repair

We dispatch a technician as soon as a call is received. Response time varies based on location and availability, but our goal is to respond as quickly as possible across Grand Montréal.

Source: 24/7 Emergency Repair

Call 450-473-0909. The line is available 24/7, including weekends and holidays.

Source: 24/7 Emergency Repair

Energy optimization involves analyzing how mechanical equipment operates and adjusting its settings to reduce energy consumption without compromising comfort or production. This includes combustion tuning, scheduling optimization, and retrofitting obsolete equipment.

Source: Energy Optimization

Results vary depending on the initial condition of the equipment and the type of intervention. An energy audit identifies concrete opportunities and quantifies potential savings before any work begins.

Source: Energy Optimization

Yes. Several government programs, such as ÉcoPerformance from Transition énergétique Québec, offer financial incentives for energy efficiency projects in commercial and institutional buildings. Montréal Combustion can guide you to the applicable programs.

Source: Energy Optimization

We service atmospheric, premix, modulating, and high-efficiency burners from manufacturers such as Power Flame, Riello, Dungs, and many others.

Source: Natural Gas Combustion and Heating

A minimum of one annual inspection is recommended. High-usage systems or those in critical environments benefit from semi-annual maintenance with combustion analysis.

Source: Natural Gas Combustion and Heating

Yes. Our 24/7 emergency service covers combustion breakdowns throughout Grand Montréal, including Rive-Nord and Rive-Sud.

Source: Natural Gas Combustion and Heating

Mechanical plumbing deals with large-scale systems in commercial and industrial buildings: circulation pumps, pressurized hot water networks, commercial water heaters, water treatment systems, and control valves. The technical and regulatory requirements are significantly different from residential plumbing.

Source: Mechanical Plumbing

Circulation pumps for heating networks, booster pumps, condensate pumps, and process pumps. We service brands such as Grundfos, Bell & Gossett, and many others.

Source: Mechanical Plumbing

Yes. Water treatment is essential to prevent corrosion, scale buildup, and contamination in boilers and hot water networks. We offer water analysis, treatment system installation, and ongoing monitoring programs.

Source: Mechanical Plumbing

Hot water and steam boilers, gas burners, rooftops, air conditioning systems, ventilation, pumps, valves, and commercial water heaters.

Source: Preventive Maintenance — Boilers, HVAC, and Mechanical Equipment

Frequency depends on equipment type and usage intensity. An annual minimum is recommended, with semi-annual visits for critical systems.

Source: Preventive Maintenance — Boilers, HVAC, and Mechanical Equipment

Cost depends on the number and type of equipment, their criticality, and the visit frequency set in the contract. We build a tailored program after assessing your facilities, which lets you plan a stable maintenance budget instead of absorbing unplanned emergency repairs.

Source: Preventive Maintenance — Boilers, HVAC, and Mechanical Equipment

Yes. Our visits include safety device verification, combustion testing, and a detailed report documenting equipment condition. This traceability makes it easier to demonstrate compliance with applicable standards, including the CSA B149 gas installation code, and to meet the obligations tied to your license.

Source: Preventive Maintenance — Boilers, HVAC, and Mechanical Equipment

Ventilation ensures indoor air renewal, removes pollutants, controls humidity, and maintains a healthy environment for occupants. Inadequate ventilation can lead to health issues, mold growth, and regulatory compliance problems.

Source: Ventilation and Indoor Air Quality

Exhaust fans, air exchangers, air handling units (AHUs), heat recovery ventilators (HRVs), and energy recovery ventilators (ERVs).

Source: Ventilation and Indoor Air Quality

Excessive window condensation, persistent odors, occupant complaints about air quality, high CO2 levels, and mold growth are common indicators of insufficient ventilation.

Source: Ventilation and Indoor Air Quality

Typical signs are a yellow or unstable flame, soot around the appliance, a smell of burnt gas, a burner that locks out repeatedly, or a boiler room door that is hard to open (negative pressure). A combustion analysis confirms the diagnosis: abnormally low excess air and a rising CO reading point to a lack of fresh air.

Source: Combustion air: requirements and field checks

No, never. Blocking a combustion air opening, even partially, starves the burner of the oxygen needed for complete combustion and can cause carbon monoxide production. Air openings must stay clear at all times; it is a safety requirement, not a comfort choice.

Source: Combustion air: requirements and field checks

The installation must comply with the CSA B149.1 code enforced by the RBQ, and any work on a gas installation must be carried out by a contractor holding the appropriate licence and belonging to the CMMTQ. The building manager remains responsible for keeping openings clear and having the air supply verified during preventive maintenance.

Source: Combustion air: requirements and field checks

Don't rely on a one-size-fits-all figure like '12 psi.' Cold-fill pressure is calculated: take the height of the highest point above the gauge, divide it by 2.31, then add about 4 psi to guarantee positive venting at the top. A multi-storey building therefore needs a much higher pressure than a residential system.

Source: Purging and filling a hydronic circuit: the clean method

Forced purging removes the free air — over 95 % of the volume — but not the air dissolved in the water. As the water heats, it releases those dissolved gases, which reappear as bubbles. Capturing them continuously, over several days, is the job of the microbubble separator, not of the initial purge.

Source: Purging and filling a hydronic circuit: the clean method

Fill and do the bulk of the purging with the circulator off. With the pump off, air rises by natural buoyancy toward the high points and vents, where you can release it. The pump only finishes the deaeration once most of the air is already out.

Source: Purging and filling a hydronic circuit: the clean method

The only valid target is the value printed on the appliance rating plate. On natural gas it is typically around 3.5 inches of water column (w.c.); on propane, around 10 to 11 in w.c. But you always set to the plate, never to a remembered value.

Source: Setting gas pressure at the manifold: a field guide

Always under load, with the burner firing at rated input. A reading taken at rest tells you nothing about how the regulator behaves once gas is actually flowing. On a multi-stage unit, check every stage.

Source: Setting gas pressure at the manifold: a field guide

Because a correct manifold pressure can hide a weak supply. Inlet pressure must stay at least 1 in w.c. above the manifold pressure shown on the plate, ideally tested while as many gas appliances as possible are running.

Source: Setting gas pressure at the manifold: a field guide

Yes. Section 338 of the Regulation respecting occupational health and safety (RSST) requires the employer to supply personal protective equipment free of charge and to ensure workers know how to use it. Owning your own PPE can never be used as a hiring criterion.

Source: PPE for mechanical work: a field compliance checklist

The main ones are CSA Z94.1 (hard hats), CSA Z94.3 (eye and face protection), CSA Z94.2 (hearing protectors), CSA Z94.4 (respiratory protective devices) and CSA Z195 (protective footwear). The RSST makes several of these mandatory, notably Z94.3 for the eyes and Z195 for the feet.

Source: PPE for mechanical work: a field compliance checklist

It depends on the contaminants and the oxygen level. Any use of a respiratory protective device must fall under a program compliant with CSA Z94.4. Where combustion products, dust or a confined space are present, the risk assessment dictates the device type. A portable CO detector remains essential near any gas appliance.

Source: PPE for mechanical work: a field compliance checklist

There's no magic number: the right measure is coverage, not volume. A simple preventive-maintenance visit may fit in five or six shots (nameplate, general condition, readings, after); a complex repair will need twenty. The test is whether a colleague who wasn't there could reconstruct what was done from the photos alone. Too many unsorted photos hurt as much as too few.

Source: Photo documentation of service jobs: best practices

No. The photo documents the condition and the action; the report documents the reasoning, the measurements and the recommendations. They complement each other. A nameplate photo saves you from copying a serial number by hand, but it won't say why you replaced a part or what value you measured. Aim for complementarity, not substitution.

Source: Photo documentation of service jobs: best practices

Safety always comes before documentation. Before any work in the hazardous zone of a unit, lockout or an equivalent energy-control method is mandatory in Quebec under the Regulation respecting occupational health and safety. Photograph the initial state and the nameplate without exposing yourself, then document the rest once the equipment is secured. No photo justifies short-circuiting an energy-control procedure.

Source: Photo documentation of service jobs: best practices

As soon as a shot identifies a person or reveals access details (codes, plans, posted contact information), it falls under Quebec's personal-information rules. Frame tightly on the equipment, avoid capturing faces or documents without reason, and store photos in a system whose hosting and access you understand. Collecting less is the best protection.

Source: Photo documentation of service jobs: best practices

A lockout after the trial for ignition almost always means the flame safeguard never received a sufficient flame signal within the ignition-proving window. Typical causes are a dirty or misaligned flame rod, a poor ground, reversed polarity, or an ignition that simply didn't happen (no gas, no spark, no pilot). You confirm by measuring the flame signal in microamps during the trial.

Source: Sequence of operations: diagnosing a burner

Pre-purge is the ventilation of the combustion chamber by the blower before any ignition, to clear out any accumulation of unburned gas. The flame safeguard won't start the trial for ignition until it has proven airflow (air-proving switch) and a minimum delay has elapsed. Bypassing this step creates an explosion risk at light-off: it is a protection, never a formality.

Source: Sequence of operations: diagnosing a burner

The common order of magnitude is a few microamps DC, often around 2 to 7 µA depending on the system, with a minimum threshold below which the control declares loss of flame. The exact reference value and fault threshold are specific to the control: the manufacturer's data sheet is what governs, not a universal rule. A weak but present signal often signals a flame rod nearing the end of its life.

Source: Sequence of operations: diagnosing a burner

The base logic — call, pre-purge, trial for ignition, flame proving, run, post-purge — is common to nearly every automatic gas burner. What varies is the timing, whether there's a high-fire proving step, the flame-detection technology and the fault codes. The flame safeguard manual remains the reference for exact values.

Source: Sequence of operations: diagnosing a burner

There is no regulatory comfort limit for CO2: ASHRAE uses it as a ventilation indicator and recommends that the indoor concentration stay no more than about 700 ppm above outdoor air at steady state, which often means around 1,000 to 1,100 ppm in an office. As a workplace reference, Quebec's RSST 8-hour exposure limit (VEMP) is 5,000 ppm, far above the comfort threshold. Past roughly 1,000 ppm you mainly see complaints of fatigue and stuffy air, a sign that fresh-air supply isn't keeping up with occupancy.

Source: Air quality complaints: a field diagnostic approach

None in normal operation: in a space with no combustion source, a properly tuned appliance should produce no meaningful CO reading. The RSST 8-hour limit is 35 ppm and the short-term limit (VECD) is 175 ppm, but those are exposure ceilings, not targets. Any stable, repeated CO reading must trigger a search for the source — backdraft, a mistuned combustion appliance, a contaminated air intake — before any other step.

Source: Air quality complaints: a field diagnostic approach

Raising airflow or changing setpoints before measuring anything. Without objective readings of CO, CO2, temperature and humidity, you're treating a perceived symptom without knowing the cause, and you often just move the problem elsewhere in the building. Measure first, adjust second.

Source: Air quality complaints: a field diagnostic approach

Forced air responds faster because it delivers heated air directly. Hydronic takes longer to come up to temperature since the water must be heated first, but it holds a more stable, even warmth once it reaches steady state. For a building with intermittent occupancy, the responsiveness of forced air can be an advantage.

Source: Hydronic vs forced air: a commercial comparison

Yes, and it is common in Quebec. Many commercial buildings use a hydronic boiler for base heating and air-handling units for ventilation and top-up. This combination lets you separate thermal comfort from the management of fresh air and humidity.

Source: Hydronic vs forced air: a commercial comparison

Hydronic generally integrates better with a multi-source approach: a gas boiler, heat pump, heat recovery or solar thermal can all feed the same water loop. Forced air is still relevant, but switching to electric or dual-energy sources is often more constrained on the distribution side.

Source: Hydronic vs forced air: a commercial comparison

When the products of natural gas combustion condense, they form water laced with weak acids, with a pH typically between 2.9 and 4.0 — about the same as vinegar. The more efficient the appliance, the more it condenses, and the more acidic water there is to dispose of. That's why plumbing codes require this discharge to be neutralized before it reaches the drain.

Source: Condensate drains: maintenance and common pitfalls

Standard practice is to recharge the media at least once a year, ideally during the appliance's annual service, or as soon as the pH measured at the outlet drops below 5. On an appliance that condenses heavily — long heating seasons, deep modulation — a mid-season check is a wise precaution.

Source: Condensate drains: maintenance and common pitfalls

A frozen condensate line is one of the most common causes. If the water can no longer drain, it backs up into the appliance and the control goes into lockout to protect itself. Any section running outdoors or through unheated space should be shortened, insulated or protected with self-regulating heat cable.

Source: Condensate drains: maintenance and common pitfalls

No. The connection must be indirect, with an air gap over a floor drain or funnel, so a sewer backup can never reach the appliance. And if the condensate is acidic, it must pass through a neutralizer before discharge, as required by the Plumbing chapter of the Québec Construction Code.

Source: Condensate drains: maintenance and common pitfalls

No. The benefit appears as soon as a piece of equipment is serviced by more than one person or over several years. Even a single building gains from centralizing history: the day the usual technician is unavailable, it's the record that carries the context, not one person's memory. Portfolio size changes the tool you choose, not the principle.

Source: Cloud maintenance records: centralizing equipment history

That's the first question to ask any vendor. Quebec's Law 25 imposes obligations as soon as a record holds personal information (occupant contacts, access codes, signatures). Check the hosting location, the security measures, and any clauses on disclosure outside Quebec. A purely technical history (combustion readings, parts) raises fewer issues than a record mixing in personal data.

Source: Cloud maintenance records: centralizing equipment history

You don't digitize everything at once. Start with critical equipment and the current year, then back-fill older history as interventions occur. The key is to stop feeding the old silos: from a set date, every intervention goes into the central system. Catching up on the past happens afterward, by priority.

Source: Cloud maintenance records: centralizing equipment history

On the contrary, it equips it. The record doesn't decide for you; it gives the technician the trend — a combustion efficiency drifting down, the same fault recurring, a part replaced three times in two years. That trend, invisible in a binder, is what turns a reactive repair into a planned decision.

Source: Cloud maintenance records: centralizing equipment history

Yes, and usually more: a digital probe removes parallax and needle-zero drift. But that accuracy only holds if the instrument is calibrated and you have zeroed it before measuring. A drifted sensor showing three decimals is still wrong — resolution is not accuracy.

Source: Connected pressure gauges: reading measurements on mobile

Testo probes are rated up to roughly 350 ft (≈100 m) line of sight, and Fieldpiece Job Link probes up to 1000 ft (≈305 m). Those figures assume a clear line of sight. Inside a steel boiler room, behind a fire door, or between floors, real range drops sharply — plan to stay near the appliance.

Source: Connected pressure gauges: reading measurements on mobile

Yes, with a low-pressure differential probe (such as the Testo 510i, ±150 hPa / ±60 in W.C. range). You read manifold pressure at the dedicated tapping with the appliance firing. The target value always comes from the appliance rating plate and the CSA B149.1 code — never from a number recalled from memory.

Source: Connected pressure gauges: reading measurements on mobile

An HRV transfers only sensible heat between exhaust air and incoming fresh air. An ERV also transfers part of the moisture, which helps manage humidity in both summer and winter. The right choice depends on the building's occupancy profile, humidity loads and indoor-air-quality requirements.

Source: Heat recovery: cutting the energy bill

Québec's long, cold winters create a large temperature gap between exhaust air and incoming fresh air, so there is a lot of energy to recover. The longer the heating season, the shorter the payback. Actual return still depends on airflow, operating hours and the cost of energy on site.

Source: Heat recovery: cutting the energy bill

Yes, with an economizer installed in the flue, which transfers heat from the gases to the feedwater or another fluid. The gain depends on the type of economizer and on having a low-temperature heat sink. Compatibility with the boiler and the draft must be verified before installing.

Source: Heat recovery: cutting the energy bill

In Québec workplaces, the Regulation respecting occupational health and safety sets a time-weighted average exposure value (TWAEV) of 35 ppm over 8 hours and a short-term exposure value (STEV) of 175 ppm over 15 minutes for carbon monoxide. The level immediately dangerous to life or health (IDLH) is 1,200 ppm. Any reading approaching these thresholds calls for evacuation and shutdown, not a note in the logbook.

Source: Carbon Monoxide Alarm: The Field Procedure

It can, but you never assume so. An alarm certified to CAN/CSA 6.19 trips on real exposure; it can also sound at end of life (typically 5 to 10 years depending on the model) or on a battery fault. The field rule: always treat the alarm as real, evacuate, measure with a calibrated instrument, and only conclude 'false alarm' after a confirmed 0 ppm reading and a check of the alarm's replacement date.

Source: Carbon Monoxide Alarm: The Field Procedure

Incomplete combustion and deficient venting. In practice: a cracked heat exchanger, a fouled or misadjusted burner, a blocked flue, building-depressurization spillage, or insufficient combustion air. That is why a CO reading must always come with a check of the venting and draft, not just a burner adjustment.

Source: Carbon Monoxide Alarm: The Field Procedure

On a well-tuned natural gas unit, combustion efficiency is typically around 80 to 85 % for a traditional atmospheric boiler, and can exceed 90 % on a condensing boiler when the return water is cold enough. These are ballpark figures — only a flue gas analysis on your own unit gives the real number.

Source: Understanding boiler combustion efficiency

Extra air carries no useful heat: it gets warmed up and then sent out the chimney, taking energy with it. Too little air, on the other hand, causes incomplete combustion and carbon monoxide. The goal is the right amount of excess air, confirmed by measuring O₂ in the flue gas.

Source: Understanding boiler combustion efficiency

Not automatically. Condensing only pays off when the return water is cold enough to condense the water vapour in the flue gas. On a system designed for high-temperature distribution, the real benefit can be limited until you adjust the supply temperatures. The diagnosis has to come before the equipment choice.

Source: Understanding boiler combustion efficiency

ASHRAE 62.1 recommends MERV 13 where the equipment allows, because it efficiently captures fine particles (PM2.5) and many bioaerosols. MERV 6 to 8 remains acceptable for basic air quality. The right choice depends on the building's use and on whether the fan can actually sustain design airflow with that filter installed.

Source: MERV ratings: choosing the right filtration

That is the real risk. A higher rating increases pressure drop: a MERV 13 filter typically shows around 0.22 to 0.28 in. w.g. of resistance when clean, and more as it loads. If the fan cannot sustain that resistance, airflow drops and the building ends up under-ventilated. You have to check the fan curve before going higher.

Source: MERV ratings: choosing the right filtration

The MERV scale stops at 16 and covers standard commercial HVAC filtration. HEPA filters sit beyond it and capture at least 99.97% of 0.3 µm particles, but their high pressure drop demands a system designed for them. In the vast majority of commercial buildings, you work with MERV ratings, not HEPA.

Source: MERV ratings: choosing the right filtration

Rather than a fixed schedule, the right benchmark is final pressure drop: you replace the filter when it reaches the maximum resistance recommended by the manufacturer, measured with a gauge. This predictive approach maintains both air quality and energy performance.

Source: MERV ratings: choosing the right filtration

The schematic — often called a ladder diagram — shows how the system works: the control logic, read top to bottom, one line at a time. The connection (or wiring) diagram shows how the equipment is actually wired, mirroring the physical position of terminals and conductors. You diagnose with the schematic and verify the wiring with the connection diagram.

Source: Reading an HVAC Wiring Diagram: A Field Method

Almost every piece of HVAC equipment lives in two worlds: power (120, 240 or 600V depending on the unit) feeding motors and heating elements, and a low-voltage control circuit — typically 24V — that drives relays, contactors and the thermostat through a transformer. Mixing them up wastes time and creates electrical risk, so you first locate the transformer and the boundary between the two.

Source: Reading an HVAC Wiring Diagram: A Field Method

They are the standard terminals of the 24V control circuit. R carries power from the transformer, C is the common (return), Y calls for cooling, G runs the blower fan, and W calls for heat. Knowing this labelling lets you trace a heat or cool call from the terminal all the way to the relay it energizes.

Source: Reading an HVAC Wiring Diagram: A Field Method

Electrical installation work must be carried out by a holder of an RBQ electrical-construction licence who is a member of the Corporation des maîtres électriciens du Québec (CMEQ), and must comply with the Quebec Construction Code, Chapter V – Electricity. An HVAC technician can diagnose and measure as part of the job, but modifying an electrical installation has a specific legal framework worth knowing.

Source: Reading an HVAC Wiring Diagram: A Field Method

The regulations amending Chapter II (Gas) of the Construction Code and Chapter III (Gas) of the Safety Code came into force on March 26, 2026. The RBQ's official news release was published on March 11, 2026. Existing installations remain governed by the Safety Code, which frames operation and maintenance over time.

Source: Quebec's 2026 RBQ gas code update: what changes

Any installation work or work on gas-fired appliances must be entrusted to a specialized contractor holding the appropriate RBQ licence and a member of the CMMTQ. An owner or manager cannot carry out this work themselves. Keep your compliance records and service reports on file.

Source: Quebec's 2026 RBQ gas code update: what changes

Yes. The revision formally brings hydrogen into the regulatory framework by making the Canadian Hydrogen Installation Code applicable. In practice, projects involving hydrogen must now comply with that standard — a clear sign the RBQ is preparing the gas sector for the energy transition.

Source: Quebec's 2026 RBQ gas code update: what changes

No. Ultrasound helps you quickly locate a pressurized leak by its turbulence, but confirming a combustible-gas leak relies on the methods recognized under CSA B149.1, such as leak-detection solution or an approved gas detector. Ultrasound is a locating tool, not a compliance test.

Source: Ultrasonic detector: testing steam traps and leaks

A boiler room is acoustically busy. A detector set too sensitive or poorly aimed picks up reflections and background noise. Lower the gain, use the focusing cone or the contact probe, and compare a suspect point against a healthy reference of the same type.

Source: Ultrasonic detector: testing steam traps and leaks

A pocket heterodyne detector is enough to check accessible traps and leaks. A multi-microphone acoustic imager finds overhead or hard-to-reach leaks faster across large spaces, but it is a heavier investment to justify against the size of your asset base.

Source: Ultrasonic detector: testing steam traps and leaks

A range of roughly 30% to 50% relative humidity supports comfort and limits biological contaminants. During deep cold snaps you often have to sit near the low end — around 30% or below — to avoid condensation on windows and cold surfaces. Sustained levels above 60% raise the risk of mould and other biological growth.

Source: Controlling humidity through ventilation in commercial buildings

It depends on the use. Central humidification can be justified for sensitive spaces (archives, certain processes, healthcare settings), but in many buildings the real issue is excess humidity that is poorly exhausted, or fresh air that is poorly distributed. Before adding humidification, check airflow rates, heat recovery, and envelope tightness.

Source: Controlling humidity through ventilation in commercial buildings

Condensation appears when warmer, more humid indoor air meets a cold surface below its dew point. It usually signals indoor humidity that is too high for the outdoor temperature, insufficient ventilation, or an envelope weakness. Increasing air change and adjusting the humidity setpoint normally resolves it.

Source: Controlling humidity through ventilation in commercial buildings

The aid targets rental units built in 1995 or earlier, located in zones defined by Hydro-Québec based on deprivation indices. One announced condition is that the tenant must be financially responsible for the electricity account. Full criteria and eligible zones will be published at launch, on June 15, 2026.

Source: Heat pump subsidy for rental buildings: what changes

According to the announcement, the aid applies to the cost of the equipment and its installation, for ENERGY STAR–certified heat pumps. The exact rate, caps, and supporting documents fall under the official program terms, which should be confirmed when building the application.

Source: Heat pump subsidy for rental buildings: what changes

Yes. Electrical capacity, panel condition, unit placement, condensate drainage, and noise all govern real feasibility. An eligible unit that is poorly integrated is still a poor project, subsidy or not.

Source: Heat pump subsidy for rental buildings: what changes

It depends on loop criticality and running hours. A solid baseline is a sensory check (noise, vibration, leaks, temperature) on every round, plus a full scheduled inspection based on manufacturer recommendations and site history. What matters is a documented program rather than purely reactive interventions.

Source: Boiler Room Pump & Circulator Maintenance Checklist

A new sound (whine, rumble, knock), rising vibration, a temperature climb at the bearing, or abnormal lubricant traces. Bearings are the most reliable leading indicator of impending failure and the cheapest item to monitor: a sound that changes should never be ignored.

Source: Boiler Room Pump & Circulator Maintenance Checklist

Not necessarily. Classic braided packing must drip slightly to cool and lubricate itself; a light, steady weep is normal. It's a growing leak, a jet, or a completely dry gland that should raise a flag. A mechanical seal, on the other hand, should show no visible leak.

Source: Boiler Room Pump & Circulator Maintenance Checklist

Not systematically. Many symptoms (lubrication, alignment, coupling, packing) can be corrected without replacing the pump. A methodical read separates routine maintenance from genuine end-of-life, letting you schedule replacement outside the heating season instead of as an emergency.

Source: Boiler Room Pump & Circulator Maintenance Checklist

Because humidity, dust, corrosive contaminants or unstable operating conditions can shorten the life of enclosures, heat exchangers and electronic controls. A high rated efficiency does not protect against a poor site fit.

Source: Boiler Robustness vs Efficiency in Industrial Sites

No. They can be highly relevant when the environment, combustion air quality, maintenance capability and operating profile support them. The key issue is fit to the site.

Source: Boiler Robustness vs Efficiency in Industrial Sites

Look at total cost of ownership, shutdown risk, parts availability, maintainability and operational impact, not only theoretical efficiency.

Source: Boiler Robustness vs Efficiency in Industrial Sites

No. Its relevance depends on the load profile, burner type, condition of the existing controls and the site's goals.

Source: Micromodulation and O2 Trim in the Boiler Room

No. It can also help maintain more stable combustion when conditions change, which may support performance and operating consistency.

Source: Micromodulation and O2 Trim in the Boiler Room

Often yes, but the compatibility of the equipment, the condition of existing components and the control logic all need to be reviewed first.

Source: Micromodulation and O2 Trim in the Boiler Room

Not always. For some buildings it is a long-term operating strategy that balances resilience, winter peak management and seasonal performance.

Source: When Dual-Energy Makes Sense for Building Heating

Yes, but the existing network, distribution, controls and real building loads must be reviewed first. A poorly sequenced hybrid conversion can shift problems instead of solving them.

Source: When Dual-Energy Makes Sense for Building Heating

No. Incentives may support a project, but the foundation still has to be operational safety, technical compatibility and a durable system strategy.

Source: When Dual-Energy Makes Sense for Building Heating

Because in urgent situations or when data is limited, teams often add a quick safety margin. That habit can hurt modulation, stability and operating costs.

Source: Modernize a Boiler Room Without Oversizing

Not in every case, but envelope condition, air leakage and control sequences strongly influence correct sizing. Ignoring them can lead to an oversized or poorly operated solution.

Source: Modernize a Boiler Room Without Oversizing

Yes. A production system cannot be evaluated correctly if the control logic and the distribution side are not understood first.

Source: Modernize a Boiler Room Without Oversizing

That depends on the network type, process criticality and failure history. The key is to have a planned and documented program rather than relying only on reactive replacement.

Source: Steam Traps: The Hidden Losses in a Steam Network

Yes. It can also degrade heat transfer, destabilize the network, accelerate wear on other components and make operations harder to manage.

Source: Steam Traps: The Hidden Losses in a Steam Network

Not necessarily. A field-based review often makes it possible to prioritize by criticality, actual condition and operational impact.

Source: Steam Traps: The Hidden Losses in a Steam Network

Eligible categories and calculation rules can change from one period to the next. Consult the current documentation when structuring your project and confirm with a program advisor or the official portal.

Source: Energy Efficiency Subsidies and Programs in Québec

Programs often require a demonstrated need, baseline measurements or a savings tracking method. A technical audit or characterization strengthens the application, even when the replacement seems obvious on paper.

Source: Energy Efficiency Subsidies and Programs in Québec

Best practice separates energy assumptions, before/after measurements and responsibilities among equipment suppliers, contractors and building owners. Montréal Combustion can support the implementation and mechanical optimization side.

Source: Energy Efficiency Subsidies and Programs in Québec

A full preventive maintenance inspection is recommended at least once a year. Critical or high-usage systems benefit from semi-annual inspections.

Source: Preventive Boiler Maintenance: Reducing Breakdowns and Costs

Decreased efficiency, unusual noises, an unstable flame, leaks or rising gas consumption are common indicators.

Source: Preventive Boiler Maintenance: Reducing Breakdowns and Costs

Efficiency is one factor, but it must be weighed against operating hours, the relative cost of thermal losses elsewhere in the building and the condition of the heat exchanger. An integrated assessment avoids replacing for a marginal gain when other losses dominate.

Source: When Should You Replace a Commercial Boiler?

Rigorous maintenance often extends service life, but it doesn't eliminate heat exchanger wear or control obsolescence. Beyond a certain threshold, unplanned shutdowns cost more than planning a replacement.

Source: When Should You Replace a Commercial Boiler?

Certain projects may be eligible for efficiency programs when current criteria are met. Eligibility must be confirmed at project time through official sources — never assume specific amounts.

Source: When Should You Replace a Commercial Boiler?

Hardness promotes scaling on heat exchange surfaces, but conductivity, alkalinity and dissolved oxygen also contribute to deposits and corrosion. A full water profile is needed, not just a single parameter.

Source: Water Treatment and Boiler Performance

These devices maintain system pressure and reduce air ingress, which limits certain corrosion mechanisms and stabilizes operation. Their adjustment and maintenance are part of the overall hydraulic ecosystem.

Source: Water Treatment and Boiler Performance

Chemical products must be handled and dosed according to safe protocols and applicable regulations. Coordination between the water treatment supplier and the mechanical team ensures consistent objectives.

Source: Water Treatment and Boiler Performance

Frequency depends on dust load and the surrounding environment (roads, kitchens). In commercial settings, quarterly replacement is often a minimum; pressure-drop readings help fine-tune the schedule.

Source: Rooftop Units: Maintenance and Troubleshooting

A worn or loose belt reduces airflow, increases energy consumption and can damage pulleys. Correct the tension or replace based on observed wear before failure during a peak period.

Source: Rooftop Units: Maintenance and Troubleshooting

Specify roof access details, building occupancy hours and alarm history. You can reach Montréal Combustion at 450-473-0909 to coordinate maintenance or troubleshooting.

Source: Rooftop Units: Maintenance and Troubleshooting

Causes range from pressure switch trips to partial icing, sensor faults or motor protection. Record the code, measure against the manufacturer's specified ranges and avoid repeated resets without identifying the root cause.

Source: Commercial Air Conditioning Breakdown: Rapid Diagnosis

Never compromise compartment separation or smoke control systems. Use existing mechanical ventilation, inform occupants and call a team to restore cooling or activate the designed backup ventilation.

Source: Commercial Air Conditioning Breakdown: Rapid Diagnosis

Provide the model, approximate age, last maintenance dates, filter replacement history and any unusual noise or smell. For urgent requests, call 450-473-0909 to coordinate a commercially-focused response.

Source: Commercial Air Conditioning Breakdown: Rapid Diagnosis

If there is a persistent gas odor, unexplained discomfort, a carbon monoxide alarm or any situation you consider dangerous, use the appropriate emergency line first. Technical troubleshooting comes after occupant safety is secured.

Source: Natural Gas Burner Emergency: What to Do When It Fails

Repeated resets often mask an underlying fault. Without a proper diagnosis, you risk fouling, improper combustion settings or a safety device failure. Have a qualified technician handle the intervention.

Source: Natural Gas Burner Emergency: What to Do When It Fails

For service requests or emergencies related to combustion and commercial HVAC systems, call 450-473-0909. Specify the equipment type, symptoms and any error codes displayed.

Source: Natural Gas Burner Emergency: What to Do When It Fails

Indicators like excessive humidity, persistent odors or pressure differences between zones can raise flags, but a proper diagnosis relies on airflow, CO₂ or pressure measurements depending on the context and site objectives.

Source: Ventilation and Indoor Air Quality in Commercial Buildings

Finer filtration reduces certain particles but typically increases pressure drop: you need to verify that fans and ductwork can sustain the required airflow without degrading energy performance or creating under-ventilation.

Source: Ventilation and Indoor Air Quality in Commercial Buildings

Heat recovery units and modulation strategies reduce energy losses when sensors and valves are properly calibrated. Neglected maintenance cancels out a portion of the expected savings.

Source: Ventilation and Indoor Air Quality in Commercial Buildings