Commercial refrigeration PM comes down to keeping heat out, moving heat away, and clearing water. That means door gaskets and closers, clean evaporator and condenser coils, a defrost cycle that actually terminates, working fans, and open drains. Reach-ins, prep tables, and display cases share most of these tasks with different weak points. Readings like box temperature and amp draw get logged each visit.
- Refrigeration PM falls into three jobs: keep heat out of the box, move heat out of the system, and get water out of the cabinet.
- Condenser coil cleaning is the single most valuable task, and it is harder to do well in kitchens where grease binds with dust.
- Defrost problems look like airflow problems. A coil buried in ice is often a failed heater, termination, or timer, not a failed fan.
- Different equipment fails in different places: walk-ins at doors and drains, reach-ins at gaskets and condensers, prep tables at the rail and cooler, display cases at the coil and the lighting heat.
- Log box temperature, product temperature, and amp draw at every visit so slow drift gets caught before inventory is lost.
The three jobs every refrigeration PM serves
Refrigeration equipment seems more varied than it is. A walk-in freezer, a sandwich prep table, and a glass-door merchandiser all do the same three things, and nearly every failure is a breakdown in one of them.
- Keep heat out: gaskets, door closers, strip curtains, door heaters, and the condition of insulated panels.
- Move heat away: evaporator coil, evaporator fans, compressor, condenser coil, and condenser fan. A dirty condenser or a stopped fan stops this job first.
- Clear the water: defrost, condensate drains, drain heaters on freezers, and drain pans. Frost and standing water are what heat looks like when it is not removed.
When a technician asks about your last complaint, the answer usually falls under one of those headings. Use the same framework when reading a PM report. For the broader context on restaurant equipment, the restaurant refrigeration maintenance program page covers how these visits fit into an overall plan, and the walk-in cooler and freezer guide goes into the equipment itself.
Walk-in coolers and freezers
Walk-ins are the highest-value, highest-exposure refrigeration asset in most operations. They hold the most product, run the longest hours, and have the most places for warm air to enter.
| Component | PM task | Typical finding |
|---|---|---|
| Door gaskets and sweeps | Inspect for tears, compression set, gaps; test with a light or paper strip | Hardened gasket, bottom sweep worn through |
| Door hinges, closer, latch | Check that the door closes fully on its own; adjust or replace closer | Door resting slightly open, propped by habit |
| Door and frame heaters (freezers) | Confirm they are warm and the frame is free of ice | Heater failed, ice building at the threshold |
| Evaporator coil | Inspect fin condition, clean, check for ice pattern | Uneven frost, dirt film, bent fins |
| Evaporator fans | Verify rotation, blade condition, bearing noise, amp draw | One dead fan out of several; still runs, but poorly |
| Defrost system | Verify heaters energize, termination works, fans delay correctly, drain heater is warm on freezers | Defrost ends on time instead of ending at maximum, or never ends |
| Drain line and pan | Flush line, check trap and slope, inspect pan heater | Partial blockage, slime buildup, frozen drain section |
| Condenser coil and fan | Clean coil fully, check fan blades and motor, confirm clearance around the condensing unit | Matted debris, grease film, boxes stacked against the unit |
| Compressor and electrical | Amp draw, crankcase heater, contactor, capacitors, terminations | Rising amps, burned contact |
| Panels and floor | Look for damaged panel joints, wet insulation, soft floor spots | Moisture entering at a seam |
| Lighting and strip curtains | Check LED function and curtain condition | Missing strips, bad light fixture adding heat |
Outdoor and rooftop condensing units add weather exposure. Leaves, cottonwood fluff, and construction dust accumulate on coils, and coastal air accelerates corrosion. Our page on kitchen heat and refrigeration performance covers what happens when a condenser sits near a hot kitchen exhaust.
Reach-ins and prep tables
Reach-ins and prep tables are smaller, but they make up the bulk of the refrigeration count on a typical line. They also fail more often per unit, because they sit on the cooking line, take constant door openings, and have their condensers at the bottom of a cabinet where lint and grease collect.
Reach-ins
- Gaskets on every door, checked for splits and for the flattened sealing edge that stops sealing under pressure.
- Door hinges and self-closing action, since a door that hangs open a few inches warms the cabinet quickly.
- Bottom-mount condenser coil cleaned with the panel removed, not just brushed from outside.
- Evaporator coil and fan inspected through the interior shroud for frost pattern and fan operation.
- Condensate evaporator pan and its heater, because overflow here ends up on the floor of a working kitchen.
- Interior thermometer or controller probe compared against an independent thermometer.
Prep tables and sandwich rails
- Rail lid gaskets and the cutting board edge, since a lid that does not seal lets the pan area warm up.
- Cold air path from the evaporator to the rail, which is easily blocked by pans sitting too low or overloaded.
- Lower cabinet gaskets and drawer slides.
- Condenser located under the unit, usually the dirtiest coil in the kitchen.
- Drain line from the rail, frequently blocked by food debris.
- Controller setpoint and sensor placement, because the rail temperature and the box temperature are not the same thing.
For restaurants the practical point is that a prep table running at the edge of 41 F may pass during a quiet morning and fail during the lunch rush. Product temperature, not just cabinet air temperature, is what gets checked. The temperature logs and health inspections page covers how to keep records that match what an inspector will ask for.
Display cases and merchandisers
Display cases carry their own list because product is visible, customers open the doors, and lighting adds heat inside the case. Self-contained cases are serviced much like reach-ins. Remote cases tied to a rack or condensing unit are part of a larger system and need coordination with the refrigeration plant. The refrigeration rack and condensing unit page explains that side.
- Door and gasket condition on every glass door, plus door heaters that prevent fogging.
- Case lighting function and heat load. A failed or substituted fixture can change case temperature.
- Air curtains on open cases. The discharge and return grille must be free of product, signage, and packaging. Overstocking beyond the load line is a common cause of warm product.
- Evaporator coil, fans, and defrost schedule for each case, with a check that the defrost termination is functioning.
- Drain and trap, especially in cases that are washed down.
- Night curtains where fitted, since these are damaged by repeated handling.
- Alarm and monitoring function, so a warm case is reported before inventory is affected.
Grocery and convenience retailers should read this alongside the grocery and retail industry page, which discusses how refrigeration fits into store operations.
Readings to log on every visit
| Reading | Applies to | What it shows |
|---|---|---|
| Box or cabinet air temperature | All equipment | Whether the space is holding setpoint, and where the controller reads against a reference thermometer |
| Product temperature | Walk-ins, prep tables, display cases | What the food is actually experiencing, which differs from air temperature |
| Suction and discharge pressure | Walk-in condensing units, remote systems | Condenser and evaporator conditions |
| Superheat and subcooling | Systems with a measurable metering device | Charge and expansion device behavior |
| Compressor amp draw | All compressors | Mechanical wear and electrical load over time |
| Evaporator and condenser fan amps | All fans | Early warning of bearing or winding failure |
| Defrost start, end, and termination | Walk-ins and cases | Whether the cycle ends by temperature or only by time clock |
| Coil condition (photo) | Evaporator and condenser | Evidence of what cleaning actually removed |
A slow rise in compressor amps combined with a slowly rising box temperature is a typical story: a condenser filling with grease. Without trended readings, it looks like a surprise failure on the hottest day. With them, it is a line item.
Timing the visit around operations
Refrigeration PM has to work around food. Opening a walk-in for a long cleaning disturbs the temperature, and pulling a condenser panel on the line during service is a bad idea. A reasonable approach is to book visits for the quiet part of the day or after close, to have staff pre-stage product out of the way of the evaporator, and to agree in advance on how long a cabinet can be open or powered down.
Pair the schedule with the restaurant inventory work in the refrigeration inventory and risk ranking page, which helps decide which boxes get the closest attention. If a unit shows repeated trouble, a root-cause review via the second opinion diagnostic is often better than another coil cleaning.
Contractor shall inspect and service each listed walk-in, reach-in, prep table, and display case on the schedule in the attached equipment list. Service shall include gasket and door inspection, evaporator and condenser coil cleaning, defrost and drain verification, fan and electrical checks, and recorded temperature and amp readings. Contractor shall report findings requiring repair to Owner for approval before work proceeds.
Who performs the work
Davinci's refrigeration work is performed by its own UA Local 250 crew with no subcontractors, and refrigerant handling follows EPA Section 608 practice. Panel replacement, roofing over a condensing unit, and electrical service to the box are different trades. If your equipment needs work of that kind, the scope should name who handles it. More on equipment coverage is on the refrigeration and coolers service page.