What does this motorized control damper quarterly checklist cover?

15 items across 5 sections, covering before the round, actuator and stroke, blades and seals, controls and feedback, 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 HVAC or controls tech on the quarterly air-side round, at the air handler and at zone dampers.

When in the schedule should this walk happen?

Every quarter with the air-handler and economizer checks, since a damper that won't fully open or close skews mixed-air control until someone strokes it.

Why do these items ask for a photo?

10 of the 15 items call for photo evidence, 12 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 quarterly inspection?

Position feedback reads full open at the controls while the blades are only part way because the linkage has slipped on the shaft. Outside-air damper commanded closed but blade seals worn, so it leaks cold air into the mixed-air plenum all winter. Actuator humming against a bound linkage, drawing current but not moving the blades through their full stroke.

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 quarterly maintenance checklist

A quarterly control damper round is short on purpose: it catches the wear items that fail between annual services. This checklist is sized for a tech with a phone. Every item says what to look at and the photo that proves the round happened. 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.

Before the round

Damper list and the last round's open items reviewed
Damper schedule with each BAS point in hand, last round's open items listed, and command against feedback trends scanned for dampers that lag or stick.
No photo
Owner told before dampers are overridden from the BAS
Owner or operator told which units and zones will see dampers driven off normal control, with outdoor air strokes kept brief in freezing weather.
No photo

Actuator and stroke

Full open and closed stroke observed
Damper driven to both end positions and the blades watched through the full travel, actuator not stalling or slipping short of either stop.
Fans serving the damper and actuator power locked out
Every fan through the damper and actuator power locked and tagged; powered checks run with access doors closed, locks removed by whoever hung them, then re-locked before hands go back in.
Linkage and shaft coupling checked
Crank arm and linkage tight on the shaft, no slop or slipped setscrew, actuator securely mounted with no play at the coupling.
Blade tie bars and any jackshaft move every blade together
With power off, blades worked through their travel on the manual override, every blade and section moving in step, tie bars pinned, none lagging or binding.
Actuator label read against the damper schedule
Actuator torque rating, control signal and spring return or non-spring type read from its label and matched to the damper schedule and sequence.

Blades and seals

Blades clear of debris, ice and bowing
Blades straight and undamaged, with no leaves, nests, ice or dropped material jamming the blades or their stops.
Blade seals and edge closure checked
Blade edge and jamb seals intact, blades meeting evenly at full close, no daylight or airflow felt through a commanded-closed damper.

Controls and feedback

Feedback compared against command
Position feedback at the controls checked against the actual blade position at several commands, not just the two extremes.
Control signal confirmed at the actuator
Control signal reaching the actuator and the blades responding proportionally, no reversed action or dead band at mid-stroke.
Outdoor air damper holds its minimum position
On outdoor air dampers, the blades hold the occupied minimum the controls command, matched to the balancing report setting, not left closed or drifting.
No photo

Return to service

Locks removed by their owner and the fans restarted
Locks and tags removed by the person who hung them, fans restarted and run, and the damper seen moving to its normal command with no new alarm.
No photo
Damper released from override back to automatic
BAS override on the damper point released, the actuator's manual override disengaged, and the point showing auto and tracking its command on screen.
Stroke and feedback findings logged to the damper record
Stroke, seal and feedback findings entered against the damper tag, with slipped linkages or leaking seals reported to the owner for repair.
No photo

What usually sends this back

The failures are almost always the evidence, not the work

Position feedback reads full open at the controls while the blades are only part way because the linkage has slipped on the shaft.
Outside-air damper commanded closed but blade seals worn, so it leaks cold air into the mixed-air plenum all winter.
Actuator humming against a bound linkage, drawing current but not moving the blades through their full stroke.

Verified against

IMC (mechanical code)

Common questions

6 answers

What does this motorized control damper quarterly checklist cover?: 15 items across 5 sections, covering before the round, actuator and stroke, blades and seals, controls and feedback, 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 HVAC or controls tech on the quarterly air-side round, at the air handler and at zone dampers.
When in the schedule should this walk happen?: Every quarter with the air-handler and economizer checks, since a damper that won't fully open or close skews mixed-air control until someone strokes it.
Why do these items ask for a photo?: 10 of the 15 items call for photo evidence, 12 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 quarterly inspection?: Position feedback reads full open at the controls while the blades are only part way because the linkage has slipped on the shaft. Outside-air damper commanded closed but blade seals worn, so it leaks cold air into the mixed-air plenum all winter. Actuator humming against a bound linkage, drawing current but not moving the blades through their full stroke.
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 AnnualMotorized control damper annual maintenance checklistDeep pass with measured leakage at close, feedback recalibration against measured position and linkage service15 items10 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 12 required photos exist. Approved walks roll into a branded turnover package with a tamper evident record behind every line.