During the inquiry stage, most buyers focus on specs, temperature range, and energy consumption. But the most common post-order problem isn't the product itself — it's inadequate site preparation causing installation delays. The unit arrives, but the floor is uneven, the power supply isn't ready, and the drainage outlet hasn't been positioned. These are all avoidable issues. One missed checklist item can cost you two to three days.
Glass door cold rooms — the core equipment for retail, food service, and supermarket applications — often need to be installed inside or adjacent to operating businesses. Space is tight, coordination is complex. Knowing the site requirements upfront isn't just about saving money — it's about delivering your project on schedule.
1. Five Site Checks Before Installation
The most critical step before installation is a physical site survey by a qualified technician or project manager. These 5 items are mandatory checklist entries. If any one fails, it must be resolved before the unit arrives — otherwise you'll face costly delays.
1. Floor Load Capacity
The full load of a cold room includes: structural panels + floor insulation + refrigeration unit + stored goods. A 10m³ standard glass door cold room, fully loaded, typically weighs between 1,500–2,200 kg, averaging ≥500 kg/m² of floor pressure.
A standard concrete floor (≥100mm thick, C20 grade) easily handles this. But wood-structured floors, upper floors, or buildings with insufficient slab reinforcement require a structural assessment before proceeding.
2. Floor Levelness
Modular cold room panels require precision interlocking. An uneven floor causes gaps between panels, directly compromising air tightness and insulation performance. Standard requirement: level deviation ≤5mm/m, with overall deviation no more than 10mm.
3. Clearance Space
Glass door cold rooms require regular maintenance and servicing. Space reserves around all sides are essential:
- All four exterior walls: minimum 500mm service corridor
- Ceiling: minimum 300mm for unit installation and heat dissipation
- Door side: clearance ≥ 1.2× the door width for full swing access
4. Power Supply Conditions
Different cold room sizes have vastly different power requirements. Confirm these parameters in advance:
- Voltage: Southeast Asia typically 220V / 50Hz; Middle East mostly 230V / 50Hz; most European countries require 380V / 50Hz three-phase
- Power capacity: Distribution panel capacity must be ≥ unit rated power × 1.3 (to handle startup current)
- Grounding: Must connect to a dedicated protective earth. Cannot share a ground with lighting circuits
5. Drainage Conditions
Defrost cycles generate water that must drain properly. Plan your drainage system in advance:
- Identify the nearest drain outlet; the drain path should be as short as possible with a slope ≥3%
- Recommended drain pipe diameter: ≥DN32 to prevent clogging
- Determine whether a condensate pump is needed (required when the drain outlet sits above the unit's drain port)
| Check Item | Standard Requirement | How to Verify | Solution if Not Met |
|---|---|---|---|
| Floor Load | ≥500 kg/m² | Structural drawings or on-site load test | Reinforce floor or select lighter-spec unit |
| Floor Levelness | Deviation ≤5mm/m | Level meter, multi-point sampling | Cement screed (20–30mm) |
| Clearance Space | Sides ≥500mm, ceiling ≥300mm | Tape measure of installation area | Compact unit design available |
| Power Supply | Correct voltage + dedicated breaker + grounding | Check panel label or hire electrician for verification | Capacity upgrade or custom voltage unit |
| Drainage | Drain outlet in place or piping pre-installed | On-site inspection of drain network | Condensate pump solution |
2. How to Prepare the Floor Foundation
The floor is the most critical structure for load-bearing and insulation. Improper foundation causes air leaks, floor icing, and soaring energy costs. Different floor conditions require different solutions.
Standard Concrete Floor
This is the most common floor type and the lowest-cost installation option. Standard procedure:
- Clean the surface — no debris, no oil or grease
- Lay ≥0.1mm vapor barrier (PE film) to prevent ground moisture penetration
- Install 50mm XPS insulation boards (compressive strength ≥150kPa)
- Apply ≥3mm waterproof membrane layer
Elevated Floor System (Recommended for Humid Climates)
In Southeast Asia, the Middle East, and Africa — regions with high temperatures and humidity — standard concrete floors are prone to moisture backflow. An elevated insulated floor system is recommended:
- Floor raised 150–300mm above ground, creating an air insulation gap
- Base board uses B1-grade PIR board: low thermal conductivity, high strength
- Ventilation openings on all sides to prevent moisture accumulation
While this adds 15–20% to upfront cost, it completely eliminates moisture-related floor icing — saving significant maintenance costs long-term.
Cold Bridge Prevention
The joint between the floor and wall panels is the most vulnerable point for cold bridging. If not handled properly, cold air escapes through this gap, and condensation or ice can form on the surface.
| Floor Type | Treatment Solution | Insulation Thickness | Best For | Cost Reference |
|---|---|---|---|---|
| Standard Concrete | Vapor barrier + XPS boards + waterproof membrane | 50mm XPS | Most applications | Baseline |
| Tile / Epoxy Floor | Clean, then lay insulation boards directly | 50mm XPS | Retrofit projects | Below baseline |
| Elevated Floor | PIR base + air gap + ventilation openings | 80mm PIR | SE Asia / Middle East / Africa | Baseline +15–20% |
| Old Cold Room Retrofit | Remove old floor, rebuild insulation and waterproofing | Case-by-case assessment | Upgrade existing units | Varies |
3. Power Supply & Electrical Configuration
Power misconfiguration is one of the most common installation issues overseas. At best, it prevents normal operation. At worst, it fries the unit. Confirming power specifications upfront avoids the nightmare of incompatible distribution equipment after delivery.
Unit Power Calculation
Cold room refrigeration unit power depends on three factors: unit size, target temperature, and ambient temperature. For a 13.2m³ standard glass door unit:
- Chilled (+2~+8°C): rated power approximately 1.5–2.0 kW
- Frozen (-18°C): rated power approximately 2.5–4.0 kW
- Glass door penalty: add 10–15% to compensate for additional cold loss vs solid door
Cable Size Selection
| Unit Power | Recommended Cable | Recommended Breaker | Notes |
|---|---|---|---|
| ≤2.0 kW (220V) | 3×2.5mm² Copper | C16A | Single-phase, standard household |
| 2.0–4.0 kW (220V) | 3×4.0mm² Copper | C25A | Single-phase, verify wire gauge |
| ≤4.0 kW (380V) | 5×2.5mm² Copper | C16A / 3P | Three-phase, smoother startup |
| 4.0–8.0 kW (380V) | 5×4.0mm² Copper | C32A / 3P | Standard for large cold rooms |
Leakage Protection & Grounding
Distribution Panel Placement
The distribution panel should be installed outside the cold room, in a dry and ventilated location, no more than 15m from the unit (longer cable runs cause voltage drop that affects performance). Label the panel with the equipment name and power rating for easier maintenance.
4. Drainage System
Drainage is often the most overlooked post-installation issue. Poor defrost water removal causes floor pooling, slippery surfaces, bacterial growth, and — in severe cases — corroded unit components.
Where Defrost Water Comes From
During operation, the evaporator coil frosts up periodically. Defrost cycles release water. The volume depends on humidity and door-open frequency:
- Standard conditions (≤15 door openings/day): approximately 2–5 L/day
- High-frequency door use (supermarkets, fresh food stores): up to 8–12 L/day
Choosing a Drainage Method
✅ Gravity Drain (Natural)
When it works: Drain outlet is at or below the unit's drain port, with a slope ≥3%
- Advantage: No extra equipment, zero maintenance cost, no noise
- Requirement: Ensure no U-trap in the drain path — prevents odor backflow
⚠️ Pump Solution
When it's needed: Drain outlet is above the unit, or horizontal distance is too long
- Advantage: Handles any installation position
- Downside: Added equipment cost, requires periodic pump inspection
- Recommended spec: Condensate pump, flow rate ≥12L/h, head ≥3m
Drain Pipe Insulation
The water inside the drain pipe is approximately +5°C, while the external environment can drop below 0°C. Without insulation, water inside the pipe freezes and causes blockages.
Drain Outlet Sealing
The drain outlet is the only passage connecting inside and outside the cold room — and the most likely point for cold air leakage. Double-seal during installation:
- Interior: Fill the gap between the drain pipe and wall penetration with polyurethane foam
- Exterior: Apply silicone sealant for waterproof sealing on the outdoor side
- Install a P-trap (U-shaped water seal) to prevent outdoor odors from entering the cold room
5. The 6-Step Modular Assembly Process
One of the core advantages of modular glass door cold rooms is rapid on-site assembly. All Flandcold standard units ship in flat-pack format — panels, ceiling, doors, and unit are packed separately, reducing ocean freight volume by 40–60% compared to traditional cold room shipments.
Assuming your site is properly prepared, here's the standard installation process for a 3–4 person team:
Lay the Vapor Barrier and Floor Boards
After cleaning the floor, lay the PE vapor barrier first, then the floor insulation boards (XPS or PIR), then the waterproof membrane. Seal all insulation board joints with aluminum foil tape to form a continuous insulation layer.
Assemble Wall Panels (Start from a Corner)
Begin from one corner of the room. Secure the corner post first, then extend panels in both directions. Each panel connects via hook-lock + sealing strip, with gap tolerance ≤1mm. Mark the glass door position in advance before panel assembly.
Install the Ceiling
Once walls are complete, install the ceiling panels. Ceilings typically come in 2–4 sections. Use temporary supports during hoisting to prevent panels from slipping. Fill all ceiling-to-wall joints with polyurethane foam for airtight sealing.
Install the Refrigeration Unit
Position the unit strictly according to the reserved space. Connect copper tubing from the outdoor condensing unit to the indoor evaporator coil, and lay control cables simultaneously. All copper joints must be nitrogen-pressure welded and purged dry before connecting to the unit.
Install Glass Doors (Critical Step)
Glass door installation requires special attention to two things: levelness and sealing. Use a spirit level to adjust door verticality — deviation ≤1mm/m. Reapply sealing strips around the door frame, then test open/close 5+ times to confirm no cold air leakage.
Electrical Wiring and System Commissioning
Connect the control panel, then power on. Start refrigeration first and observe evaporator frosting. Then set defrost parameters (typically defrost every 6 hours, 15–30 minutes per cycle). Monitor with a temperature data logger for 24 hours to confirm temperature fluctuation ≤±1°C.
| Installation Phase | Time Required | Personnel | Tools Needed |
|---|---|---|---|
| Floor Preparation | 1–2 hours | 2 | Spirit level, tape measure, cutting tools |
| Wall Panel Assembly | 2–4 hours | 3 | Power screwdriver, rubber mallet, spirit level |
| Ceiling Installation | 1–2 hours | 3–4 | Temporary support frames, lifting equipment |
| Unit Installation | 1–2 hours | 2 | Flaring tool, nitrogen cylinder, welding kit |
| Glass Door Installation | 1–2 hours | 2 | Spirit level, hex key set |
| Electrical & Commissioning | 1–2 hours | 1–2 | Multimeter, temperature data logger |
| TOTAL | 8–14 Hours | 3–4 | — |
"Our store in the Dominican Republic went from port arrival to grand opening in just 5 days — with the actual installation taking only 2 days. The key was following Flandcold's pre-installation checklist to get the site ready ahead of time."
— Flandcold Caribbean Region Customer, 2025
Summary: Installation Preparation Checklist
Installing a glass door cold room isn't complicated — the key is preparation in advance. Share this checklist with your site manager and complete all items before the equipment arrives to ensure a smooth installation.
Pre-Installation Checklist
- Floor load capacity ≥500 kg/m², level deviation ≤5mm/m
- Installation area: sides ≥500mm, ceiling ≥300mm clearance
- Voltage (220V/380V) matches the unit; distribution panel has sufficient capacity
- Dedicated breaker + RCCB + reliable grounding in place
- Drain outlet in position or drain piping pre-installed
- Drain pipes insulated and all joints sealed
- Site cleared and cleaned, floor dry
- Installation tools and personnel scheduled
Modular glass door cold rooms don't require special foundations — standard concrete floor, standard power supply, and adequate clearance space are all you need. If your site has special conditions (second-floor installation, non-standard voltage, high-humidity region), Flandcold offers custom site assessment services. Contact us for a professional pre-installation assessment report and tailored recommendations.
Contact us: flandcold.com | Installation network across 50+ countries, 50+ years of refrigeration expertise, 60+ patents.
