Freezer Door — Vertical Section

Junction Function

Freezer door installed in a GS insPIRe® CH wall for chambers with temperatures < 0°C (typically -18°C to -25°C — frozen foods, ice cream, raw meat, cryo-stored pharmaceuticals).

The fixing method is identical to chiller doors (PVC rod-nut system), but with two critical differences:

1. Door frame heating (item 02) — freezer doors have built-in heating cables around the door frame. Without this, the frame freezes on the warm side (condensation + freezing of ambient moisture) → the door cannot be opened.
2. Threshold heating (item 08) — a heating cable in the floor (or heating mat) runs beneath the threshold. Without this, the threshold becomes coated in ice from the outside (condensation → freezing), preventing the door from closing.

Critical Installation Aspects

• Threaded rod Ø10 (item 05) with PVC nuts (items 03-04) — identical to chiller installation; thermal insulation is mandatory.
• Freezer door (item 02) — with frame heating cable rated at 40-60 W/lm (depending on chamber temperature). Controlled by a thermostat with a frame temperature sensor.
• Heated threshold (item 08) — a heating cable rated at ~50 W/lm runs along the door threshold in the freezer floor. Standard industry requirement for industrial freezers.
• Frost-resistant plastic sealant (item 09) rated -40°C — standard silicones crack under deep frost conditions.
• Closing flashing (item 07) with a PES gasket — eliminates the thermal bridge from the metal flashing to the refrigerated panel.
• Freezer floor (item 08) — full sub-floor PIR system (see freezer floor termPIR) + floor heating in the threshold zone prevents frost heave of the ground.

No Heating → Failure

The most common detail failure: lack of threshold heating → after 2-4 weeks of operation, the threshold is covered with a layer of ice (5-15 mm), the door fails to close, chamber temperature rises → the storage facility cannot maintain its temperature regime.

Retrofit repair: closing the chamber for 12-24 hours, defrosting the threshold, installing a heating cable in the existing floor (chiselling + re-screeding). Cost: ~5,000-15,000 PLN per door.

Conclusion: threshold heating should be designed at the chamber design stage, not retrofitted.

Used in systems: GS insPIRe® CH cold storage wall, termPIR freezer floor.

Documentation

Gór-Stal Cold Storage Catalogue 2025, p. 37 — freezer door, vertical section.

Components in this junction