The Choice Mechanical team has put together helpful articles, guides and resources for business owners facing commercial HVAC challenges. If you have questions, need an estimate or are facing an emergency situtation, please do not hesistate to contact us.
A circulation pump can be running and still fail to move the water a building needs. Conversely, a noisy pump may be reacting to air, low suction pressure, a closed valve, or poor system control rather than reaching the end of its life. Facility managers get better...
Chiller approach temperature compresses a great deal of heat-transfer information into one number. When trended correctly, it can reveal fouling, flow problems, refrigerant-side issues, sensor drift, and declining capacity before the chiller fails to maintain...
A chilled-water plant is designed to send cold water into the building and receive it warmer after coils absorb heat. When return water comes back only slightly warmer, the plant has low delta T. The immediate temptation is to blame the chiller, but the cause often...
A steam boiler and a hot-water boiler can both heat a commercial building, but they move energy in fundamentally different ways. Steam carries latent heat as vapor and condenses at the load. A hydronic system circulates liquid water whose temperature falls as heat is...
A commercial boiler can fire cleanly, circulate water, and show no local lockout while the building remains cold. The missing heat may be hidden in a sensor that reads five degrees high, an outdoor-reset curve that lowers water temperature too aggressively, a staging...
A hydronic pump rarely announces its remaining life with one unmistakable alarm. It may continue running while flow falls, vibration rises, a seal begins to weep, or the motor draws more current. Occupants notice cold zones, while the boiler plant sees unstable...
A boiler room needs air for more than one reason. Burners require combustion air. The room may need ventilation to remove heat. Draft and venting systems depend on stable pressure. Other fuel-burning appliances, exhaust fans, louvers, and building HVAC systems can...
A commercial boiler low-water cutoff has one overriding purpose: stop heat input before an unsafe lack of water exposes heated surfaces. When it trips, the interruption may be inconvenient, but the control is doing the kind of work that protects pressure parts,...
Every pound of clean condensate that returns to a boiler plant brings back two things the facility already paid for: treated water and heat. When that condensate leaks, flashes from an open vent, backs up behind failed traps, or never reaches the receiver, the boiler...
Boiler water may look clear while it is depositing hardness on tubes, carrying dissolved oxygen into pressure parts, foaming into the steam line, or concentrating dissolved solids beyond the treatment program’s control. By the time scale or corrosion becomes visible,...
A steam trap is small compared with a boiler, but a failed trap can change conditions across an entire steam system. One failure may release live steam into a condensate return. Another may hold condensate inside a coil. Across a facility with dozens or hundreds of...
A burner can produce heat and still be operating poorly. The flame may look acceptable through the sight glass while excess air carries energy up the stack, carbon monoxide rises at one firing rate, draft changes as building exhaust starts, or a dirty heat exchanger...
