Checklists by equipment
2 lists · 10 items · 14 photosMotorized control damper maintenance checklists
Motorized control damper maintenance checklists for the quarterly and annual rounds: 2 free lists, 10 items and 14 photo requirements, each item naming what to look for and the photo that proves it. Work is commonly verified against IMC (mechanical code); the edition in force is the AHJ's call on each project.
The motorized control damper rounds
Motorized control damper QuarterlyMotorized control damper quarterly maintenance checklistActuator stroke, position feedback and blade seals checked on outside-air, economizer and VAV control dampers5 items7 photosMotorized control damper AnnualMotorized control damper annual maintenance checklistDeep pass with measured leakage at close, feedback recalibration against measured position and linkage service5 items7 photos
Where each walk sits in the schedule
- Motorized control damper quarterly maintenance checklistquarterly
- 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. Run by: The HVAC or controls tech on the quarterly air-side round, at the air handler and at zone dampers.
- Motorized control damper annual maintenance checklistannual
- Once a year with the air-handler service, when the damper can be driven manually and the closed leakage actually assessed rather than eyeballed. Run by: The controls or balancing technician on the annual air-side service, when the system can be commanded through its range off normal control.
What most often fails on a motorized control damper
- 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.
- 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
Families only, never clause numbers. Adoption varies by jurisdiction; confirm the edition your authority having jurisdiction enforces before you run a walk against it.
Common questions
- Which motorized control damper maintenance rounds do these checklists cover?
- Motorized control damper quarterly maintenance checklist (quarterly): 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. Motorized control damper annual maintenance checklist (annual): Once a year with the air-handler service, when the damper can be driven manually and the closed leakage actually assessed rather than eyeballed.
- Who runs the motorized control damper maintenance round?
- The HVAC or controls tech on the quarterly air-side round, at the air handler and at zone dampers. The controls or balancing technician on the annual air-side service, when the system can be commanded through its range off normal control.
- What most often fails on a motorized control damper?
- 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. 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.
- Which standards is motorized control damper work verified against?
- IMC (mechanical code), published by the International Code Council. Adoption varies by jurisdiction. Confirm the edition your authority having jurisdiction enforces before you run a walk against it.
- Can I run these checklists in RTI?
- Yes. Start a free RTI workspace and load any of the 2 lists (10 items in total). The Photo Gate holds the submit button until every mandatory item is answered and its photos are attached, and approved inspections roll into a branded turnover package with a tamper-evident audit trail.