| 1 | Determine the Required Capacity | Calculate the heat load from product pull-down, daily product turnover, room size, lighting, people, door openings, and surrounding conditions. Avoid selecting capacity from room volume alone. | Include product load, transmission load, infiltration load, fan and lighting heat, plus a reasonable design margin. A common engineering allowance is approximately 10–15% after the calculated load. | Request a heat-load calculation based on the actual operating schedule and product temperature. |
| 2 | Match the Temperature Range | Choose a unit designed for the required room or cabinet temperature rather than relying only on nominal horsepower or cooling capacity. | Chilled storage commonly operates around 0–4°C (32–39°F). Frozen storage is typically maintained at or below −18°C (0°F). Exact requirements depend on the product. | Confirm the required set point, allowable temperature variation, defrost method, and recovery time after door opening. |
| 3 | Allow for Ambient Conditions | Evaluate the highest expected outdoor or plant-room temperature, humidity, solar exposure, and nearby heat-producing equipment. | Condensing units are often rated at a specified ambient condition; performance can decrease as ambient temperature rises. A hot mechanical room may require additional ventilation. | Compare the unit’s published operating envelope with the site’s maximum summer and indoor temperatures. |
| 4 | Verify Physical Size and Clearance | Measure the available footprint, ceiling height, doorway width, service corridor, and clearance around air inlets and outlets before ordering. | Maintain the manufacturer’s specified clearance. As a planning principle, leave enough space for airflow and full removal of panels, filters, fans, and coils. | Create an installation drawing showing unit dimensions, access panels, airflow direction, and required service clearances. |
| 5 | Check Electrical Requirements | Confirm voltage, phase, frequency, circuit capacity, disconnect location, starting current, controls, and any local electrical requirements. | Common commercial supplies include single-phase or three-phase power at region-specific voltages. Actual current must be taken from the selected unit’s technical data. | Have a qualified electrician verify the circuit, protective devices, grounding, and disconnect accessibility before installation. |
| 6 | Evaluate Refrigerant and Compliance Needs | Select equipment using a permitted refrigerant and confirm leak-management, recovery, labeling, and installation requirements applicable to the location. | Refrigerant regulations vary by jurisdiction and application. Lower-global-warming-potential options may be required or preferred for new installations. | Confirm the refrigerant type, charge information, safety classification, technician qualifications, and local code compliance. |
| 7 | Plan Drainage and Defrost | Ensure condensate and defrost water can drain safely without freezing, backing up, contaminating stored products, or damaging floors. | Low-temperature rooms may require heated drain lines or dedicated defrost controls. Drain lines should be correctly sloped and protected from freezing where necessary. | Review drain routing, trap requirements, defrost frequency, heater load, and access for clearing blockages. |
| 8 | Consider Installation Environment | Assess dust, grease, moisture, corrosive atmospheres, wash-down procedures, vibration, noise, and the structural support available for the unit. | Dirty or greasy environments can restrict condenser airflow and increase cleaning frequency. Wet areas may require suitable enclosure ratings and corrosion-resistant components. | Select construction and protection appropriate for the room classification and cleaning method. |
| 9 | Design for Maintenance Access | Make sure technicians can reach filters, condenser coils, evaporator fans, electrical controls, sensors, valves, drain pans, and refrigerant service ports. | Routine coil and filter cleaning may be required monthly or more frequently in dusty or greasy locations. Inspection intervals should follow the equipment manual and operating conditions. | Confirm that panels can be removed safely and that service work will not require moving stored products or dismantling permanent structures. |
| 10 | Compare Efficiency, Controls, and Support | Compare seasonal efficiency, part-load performance, controls, alarms, temperature logging, spare-parts availability, warranty terms, and technical support. | Useful controls may include high- and low-temperature alarms, door alarms, power-failure notification, defrost status, and remote monitoring. Energy use depends on load, ambient conditions, set point, and maintenance. | Estimate total cost of ownership over the expected service life rather than comparing purchase price alone. |
