In short: do not use sealant or latch adjustment to hide a room that is out of square.
Common errors are an uneven door gap, excessive closing force, a blocked inside release, incompatible sealant, unsealed penetrations and missing condensate tests.
Commissioning should confirm the controller and an independent thermometer, door operation, alarms, defrost, drainage, fan airflow and temperature recovery. Record results before products are loaded.
If moisture appears at a joint, find whether it comes from air leakage, water from cleaning or a thermal bridge. Sealing the visible line without diagnosis may trap moisture.
5. Ignoring door alignment
The door is the most-used component and the single biggest weak point for thermal performance. Install the door panel hastily and the frame ends up out of plumb; the gasket then compresses unevenly — tight at the top, gapped at the bottom — and cold air escapes continuously. In freezer rooms this drives frost and ice build-up around the frame.
Prevention. The door frame must be perfectly plumb and square. Check both vertical jambs and across the head with a level. Open and close the door several times: it should swing freely and close firmly against an evenly compressed gasket. Adjust hinges to even out compression. Always test the internal safety release — you must be able to open the door from inside even when the external handle is locked.
6. Inadequate sealing
A frequent assumption is that the cam-lock joints are airtight on their own. They are not: the cam-lock provides the mechanical connection, while the gasket and applied sealant provide the air seal. Skimped or skipped sealant lets warm, humid air infiltrate, which condenses inside the panels and degrades insulation over time.
Prevention. Treat the room as a pressurised envelope — any hole leaks. Seal all internal corners (floor-to-wall, wall-to-wall, wall-to-ceiling), any visible joint seams, and every penetration cut for cables, pipes, or drainage. Use food-grade silicone (NSF or equivalent food-contact certification), colour-matched to the panels and rated for the room's operating temperature. Allow the sealant to cure per the manufacturer's instructions — typically 24 hours — before starting the refrigeration system.
7. No commissioning test before handover
Declaring the job done without proving performance is how disputes start. Faults surface after the installer has left, products get stored in a room that never reached temperature, and responsibility becomes contested.
Prevention. Run a proper commissioning test: start the refrigeration system, verify the room reaches and holds its target setpoint, listen for air leaks (a hiss at a joint), confirm even door-gasket compression, re-test the safety release, and log the initial pull-down data. Only then is the installation complete.
Finishing checklist
| Step | What "good" looks like |
|---|---|
| Door frame plumb & square | Gasket compresses evenly all round; door swings free, closes firm |
| Safety release | Door opens from inside with external handle locked |
| Internal sealing | Every corner, seam, and penetration sealed with food-grade silicone |
| Sealant cure | ~24 h before refrigeration start-up |
| Commissioning | Reaches and holds setpoint; no audible leaks; pull-down logged |
Related articles
- Common installation mistakes: overview
- Structural assembly mistakes (floor, panels, plumb, cam-locks)
- Refrigeration sizing mistakes
- Assembly process: step-by-step
- Panel specifications
Guidance reflects the MTH Algor cam-lock panel system supplied by Frostbox. For commissioning support, contact [email protected].
