Monsoon care for commercial refrigeration: humidity, power and flooding

What the monsoon does to a refrigerator

• More latent load: moisture in the air that enters the cabinet must be condensed and frozen out, so the system works harder even though the air is cooler than in May.
• Faster frost build-up on evaporators and on the walls of manual-defrost freezers.
• More defrost water, which overwhelms drains and drip trays that were fine in winter.
• Condensation on the outside of cabinets, door frames and glass, especially near entrances.
• Mould on gaskets, shelves and in drain lines.
• Corrosion speeding up on condenser fins, screws and steel near the sea.
• Power cuts, voltage dips and lightning-related surges.

Pre-monsoon checklist

• 1. Clean condenser coils thoroughly; dust turns to paste once humidity arrives.
• 2. Clean and inspect every door gasket and do the paper test. Replace any that leak.
• 3. Clear drain lines and clean drip trays, and check trays sit where they will evaporate water.
• 4. Check that door closers and hinges pull doors fully shut.
• 5. Raise units off the floor where flooding is possible, using their legs or a plinth, and move sockets and extension boards above likely water level.
• 6. Have an electrician check earthing and fit surge protection or a suitable stabiliser where the supply is unreliable.
• 7. Book an AMC or service visit before the rains start, not during the first breakdown.

Daily habits during the rains

Keep doors shut as much as possible and plan restocking so the door opens once, not ten times. Wipe condensation from frames and floors before it pools. Do not overfill cabinets — air needs to circulate to keep moisture moving to the evaporator. Watch for ice on freezer walls and defrost manual units more often. Keep cartons damp from deliveries out of the cold room; wet cardboard carries mould spores and pests.

Log temperatures at opening and closing, and after any power cut. Many monsoon problems show up first as a slow rise in temperature during the afternoon.

Power cuts and surges

• Keep doors closed during an outage. A full, closed freezer holds temperature far longer than one being opened.
• When power returns, let the compressor's restart delay do its job; do not switch units on and off repeatedly.
• If your supply comes back with flickering, high or low voltage, switch large units off at the socket until it settles, then restart.
• Unplug units during a severe electrical storm only if you can do so safely and dry-handed, and only if the stock can tolerate it.
• Check temperatures after every outage and record them.

If water reaches the unit

If floodwater has reached the compressor, wiring, controller or base of a unit, do not switch it on. Isolate it at the MCB, not the socket, if the socket is wet. Move stock out, let the area dry, and have a technician inspect and dry or replace electrical parts before the unit is powered. Floodwater is contaminated, so food that came into contact with it, and cabinet interiors it reached, need disposal or thorough cleaning and sanitising according to your food-safety plan.

Mould and musty smells

Weekly gasket cleaning becomes essential. Dry gasket folds after cleaning, clean drains more often, and wipe shelves and walls before mould spots spread. If a cabinet starts smelling musty, find the source — drain line, drip tray, gasket folds or old spills — rather than masking it. Our mould guide covers this in more detail.

Safety notes

Water and electricity are the main monsoon hazard. Never touch plugs, sockets or units with wet hands or while standing in water. Isolate at the MCB if in doubt. Units using hydrocarbon refrigerants such as R290 or R600a must be repaired only by technicians trained for flammable refrigerants; after flood damage, insist on a proper inspection before restart.