Maintenance · Plainview, NY · September 2026

Commercial Rooftop HVAC Inspection & Filter Change in Plainview

Photo-documented preventive check of five rooftop units and a Mitsubishi Electric system, with clean filters installed

What we found in the filter racks: pleated media packed grey with dust, the support grid bent out of shape.

A Lennox rooftop unit opened up, with clean 2-inch pleated filters seated in the filter rack.

Photos are lightly enhanced for clarity. The work shown is as installed or serviced.

The problem

A commercial property in Plainview asked for routine preventive maintenance on its rooftop HVAC equipment, not a repair call. The roof holds five packaged rooftop units from Trane, Lennox and Unitary Products, plus a Mitsubishi Electric outdoor unit. Rooftop equipment runs out of sight, so small problems like clogged filters or heat-damaged wiring can build for a long time before anyone notices.

Our solution

Our team went up on the roof with a clamp meter and a gauge manifold, opened the units and photographed what we found along the way. We pulled the dust-loaded pleated filters and put clean 2-inch pleated filters in the racks. We documented a disconnect switch with burned, corroded line terminals and flagged it for replacement, along with run capacitors with rusted tops and corrosion along one unit's base rail, then wrote those findings up as a maintenance and repair proposal.

The result

Clean filters are in the racks, and the problems we flagged are photographed and written into a maintenance and repair proposal. That proposal covers tune-ups for the five rooftop units and the Mitsubishi system, two capacitor replacements, and a new disconnect and power whip for the unit with the damaged switch, so the repairs can be planned and scheduled ahead of time.

Serviced

Trane Precedent YSC120 packaged rooftop unit (inspected)
Trane Precedent YSC102 packaged rooftop unit (inspected)
Lennox KGB060S4DM4Y packaged rooftop unit (inspected)
Unitary Products ZS-03N11ATAAA2A packaged rooftop unit (on the property's equipment record)
Mitsubishi Electric PUY-A12NKA7 outdoor unit (inspected)

Highlights

Rooftop check covering five packaged rooftop units (Trane, Lennox, Unitary Products) plus a Mitsubishi Electric outdoor unit
Dust-loaded pleated filters pulled and clean 2-inch pleated filters put in the racks
Disconnect switch with burned, corroded line terminals photographed and flagged for replacement
Rust-topped run capacitors and corrosion along a unit's base rail documented
Findings photographed and written into a maintenance and repair proposal

Scope of work

01Preventive-maintenance inspection of the rooftop HVAC equipment: five packaged rooftop units and a Mitsubishi Electric outdoor unit
02Opened the units and checked them with a clamp meter
03Removed dust-loaded pleated filters and installed clean 2-inch pleated filters
04Photo-documented findings: loaded filters, rust-topped run capacitors, a heat-damaged disconnect switch and base-rail corrosion
05Wrote a maintenance and repair proposal covering tune-ups, two capacitor replacements and a new disconnect and power whip for one unit

More photos from the job

One of the Trane Precedent packaged rooftop units on the Plainview roof.
Compressor section open on a Trane unit, with a clamp meter clipped inside and a gauge manifold hanging beside the unit.
Checking the Mitsubishi Electric outdoor unit on the roof with a clamp meter.
The key finding: a disconnect switch with burned, corroded line terminals, flagged for replacement in the proposal.
A run capacitor with a rusted top, found during the inspection. The proposal includes two capacitor replacements.