Roof top units · Air handling units
RTU and AHU service and repair
Rooftop units and air handlers diagnosed and repaired by a family-owned shop in Springdale, with a technician on call through the night.
Chapter 01
Two boxes, one job: moving conditioned air through a building
A rooftop unit, or RTU, is a packaged system that sits on a curb on the roof and holds everything in one cabinet: compressor, condenser coil, evaporator coil, blower and burner or heat strip. An air handling unit, or AHU, is the indoor half of a split system or a chilled-water setup: a blower, a coil and a filter rack in a mechanical room or above a ceiling. Both do the same work, and both fail in similar ways.
The symptoms you will see are a unit that runs without cooling, a space that will not warm up, ice on the coil or the suction line, a breaker that trips on startup, a blower that squeals, or water coming through the ceiling tile under an air handler. Each one points to a short list of parts.
A Trane rooftop package unit sitting on a commercial roof
How Trinity works a roof or a mechanical room
Every job starts with power off, locked out at the disconnect, then a look at the parts that wear. Belts and sheaves on belt-drive blowers. Blower bearings and the motor. Contactors and capacitors on the compressor and fan circuits. The condenser and evaporator coils for dirt and damage. The condensate drain and pan, because a plugged drain is how an AHU puts water in the ceiling. Filters, and on units that have one, the economizer damper that brings in outdoor air.
With power back on, we read the refrigerant circuit, check amp draw against the nameplate, and look at supply and return air temperatures to see whether the unit is actually moving heat. This is the same ground the Trinity System Care checklist covers, from controls to the system performance review, set up for equipment that lives on a roof.
If a repair is the right answer, we fix it. If the unit is past fixing, we say that too and point you to a swap-out.
Chapter 03
Keeping the roof from becoming a repeat call
Most rooftop problems come back for the same reason: nobody looked at the unit until it quit. Filters get changed on schedule or the blower works harder and the coil freezes. Belts get checked or one snaps on the first hot day. Coils get cleaned or the compressor runs hot until a capacitor gives out.
A Trinity Guardian Care or Priority Plus membership builds that routine into the calendar with two System Care visits and two HVAC service visits a year. If something does fail overnight or on a weekend in Springdale, Rogers or anywhere around Northwest Arkansas, the line at (479) 325-1075 is answered 24 hours a day.
Trinity Air Conditioning and Refrigeration · AR HVACR #0003128 · Call (479) 325-1075, open 24/7.
Roof or mechanical room
Where the unit lives changes how it fails
Rooftop unit
- Sun, rain and debris load the condenser coil and the cabinet seams.
- Condensate and weather seals decide whether water gets into the building.
- Heat strips or gas burners share the cabinet with the cooling circuit.
- Access for parts and a lift is part of every repair plan.
Air handler indoors
- A plugged drain pan is the usual cause of ceiling water.
- Dirty filters and coils show up first as weak airflow at the diffusers.
- Blower motor and belt wear is easy to hear before it fails.
- Controls and thermostats decide whether the space ever reaches setpoint.
Tied to a wider job? See our commercial and light commercial HVAC page, or if the drive on a large blower motor is the problem, read about VFD replacement. Plans for routine visits are on the memberships page, and the quickest way to reach us is (479) 325-1075 or the contact page.