What does this motorized control damper annual checklist cover?

15 items across 5 sections, covering preparation, leakage and closure, feedback and calibration, mechanical service, and more. Each item spells out what the person walking the job is actually looking for, not just a box to tick.

Who should run this inspection?

The controls or balancing technician on the annual air-side service, when the system can be commanded through its range off normal control.

When in the schedule should this walk happen?

Once a year with the air-handler service, when the damper can be driven manually and the closed leakage actually assessed rather than eyeballed.

Why do these items ask for a photo?

8 of the 15 items call for photo evidence, 10 photos in all. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.

What most often fails a motorized control damper annual inspection?

Closed-position leakage never assessed, so a slowly worsening seal keeps bleeding conditioned air until the energy shows up in a complaint, not a reading. Feedback recalibrated to the command signal instead of to the measured blade position, so the loop trusts a number the blades don't match. Linkage pivots and jackshaft bearings never lubricated, so the actuator works harder each year until it can't reach full close.

Can I use this checklist in RTI?

Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper evident audit trail.

Free checklist

Motorized control damper annual maintenance checklist

The annual control damper service is the deep pass: the measurements, cleanings and tests a quarterly round doesn't reach. This checklist keeps the full service on record with the photos that make it defensible later. Work is commonly verified against IMC, manufacturer's published instructions. Confirm the edition your authority having jurisdiction has adopted.

Start free with this checklist Download as PDF

The checklist

Every item, and the photo evidence it needs

The photo count on each row is what RTI would require before the item can be submitted. Work the list here and watch the gate hold, or load it into RTI and let it enforce the real thing.

Preparation

Sequence, balancing report and last year's results in hand
Sequence of operation, scheduled fail positions, the outdoor air minimum from the balancing report and last year's leakage and calibration results ready to compare.
No photo
Fail-position drops and freeze protection planned with the owner
Owner and operator warned which dampers will drop to fail position with fans running, deeper than the quarterly stroke, and freeze stats and coil temperatures watched while outdoor air opens.
No photo

Leakage and closure

Closed leakage assessed at the damper
Damper commanded fully closed and leakage across it checked by feel, tell-tale or airflow at the plenum; excessive bleed traced to seals or an incomplete stroke.
Every fan through the damper and actuator power locked
Fans and actuator power locked and tagged before seal work; calibration and fail tests run with access doors closed, locks off by whoever hung them, then re-locked.
Blade seals and stops replaced where worn
Edge and jamb seals inspected along their length, worn sections replaced, end stops set so the blades seat fully at the closed command.

Feedback and calibration

Feedback recalibrated to measured position
Actual blade angle established at open, mid and closed, and the position feedback span and zero set to match the real positions.
Actuator range and current confirmed
Actuator driven across its full range under the corrected signal, running smoothly without binding, torque and travel matching the manufacturer's figures.
Fail position observed on loss of actuator power
Actuator power removed with the fans running and the blades seen to go to, or hold at, the fail position the sequence calls for: open, closed or in place.
Loss of control signal response matched to the sequence
On modulating actuators, the signal lifted at the controller and the damper seen to take the position the sequence expects, not hunting or holding a stale command.
No photo
Spring return time checked against the manufacturer's rating
On spring-return actuators, the spring drives the blades fully to the fail position against airflow within the manufacturer's rated time, without stalling short.
No photo

Mechanical service

Linkage and pivots lubricated and reset
Jackshaft bearings, blade pivots and linkage pins cleaned and lubricated per the manufacturer, wear points noted, coupling retightened after service.
Frame mounting and squareness checked in the opening
Frame square and fastened in the duct or wall opening, no racking that binds the blades, and the seal between the frame and the duct or wall intact.
End or proof switches set to the true blade positions
Where fitted, switch cams set with the blades held at full open and full closed, and the proof confirmed at the BAS once the damper is back in service.
No photo

Return to service

Locks off by their owner and the fans back in operation
Locks and tags removed by the person who hung them, no tools or rags left at the linkage or in the duct, fans restarted and the damper back on automatic control.
No photo
Annual damper results recorded against the baseline
Leakage, calibration, fail position and seal findings entered against the damper tag beside last year's results, with open repairs reported to the owner.
No photo

What usually sends this back

The failures are almost always the evidence, not the work

Closed-position leakage never assessed, so a slowly worsening seal keeps bleeding conditioned air until the energy shows up in a complaint, not a reading.
Feedback recalibrated to the command signal instead of to the measured blade position, so the loop trusts a number the blades don't match.
Linkage pivots and jackshaft bearings never lubricated, so the actuator works harder each year until it can't reach full close.

Verified against

IMC (mechanical code)

Common questions

6 answers

What does this motorized control damper annual checklist cover?: 15 items across 5 sections, covering preparation, leakage and closure, feedback and calibration, mechanical service, and more. Each item spells out what the person walking the job is actually looking for, not just a box to tick.
Who should run this inspection?: The controls or balancing technician on the annual air-side service, when the system can be commanded through its range off normal control.
When in the schedule should this walk happen?: Once a year with the air-handler service, when the damper can be driven manually and the closed leakage actually assessed rather than eyeballed.
Why do these items ask for a photo?: 8 of the 15 items call for photo evidence, 10 photos in all. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.
What most often fails a motorized control damper annual inspection?: Closed-position leakage never assessed, so a slowly worsening seal keeps bleeding conditioned air until the energy shows up in a complaint, not a reading. Feedback recalibrated to the command signal instead of to the measured blade position, so the loop trusts a number the blades don't match. Linkage pivots and jackshaft bearings never lubricated, so the actuator works harder each year until it can't reach full close.
Can I use this checklist in RTI?: Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper evident audit trail.

Related checklists

Motorized control damper QuarterlyMotorized control damper quarterly maintenance checklistStroke, position feedback and blade seals checked on outside-air, economizer and VAV dampers15 items12 photos

Run it with the Photo Gate

A checklist nobody can submit half-finished

Load this list into RTI, stick a QR tag on the area it covers, and the submit button stays locked until every mandatory item is answered and the 10 required photos exist. Approved walks roll into a branded turnover package with a tamper evident record behind every line.