Underbar refrigeration
Holds the cold ingredients a barista reaches for on every ticket inside the working envelope, so nobody leaves the station during service.
A compressor raises the pressure of a refrigerant, a condenser rejects that heat to the surrounding air, and an evaporator inside the cabinet absorbs heat from the air circulating over the stock. Nothing in that cycle is special to a bar — the duty is. An underbar cabinet is opened more often per hour than any other refrigerated box in the building, and every opening trades cold dry cabinet air for warm humid room air the evaporator then has to reprocess. So the two things that actually decide whether the cold chain holds are not the compressor rating on the plate: they are how much air is lost per access, and whether the condenser can breathe in the position the joinery puts it in. The limits the cold chain is being held to are set by the site's own food-safety standard, not by this platform — see the temperature and time reference.
- Start from the walk count, not the litre count. The entire purpose of underbar cold is to remove trips away from the station during service. If a barista still has to go to the back for milk in the middle of a rush, the unit is the wrong size or in the wrong place — and no amount of capacity on the spec sheet fixes that.
- Size on the worst hour and on restock rhythm. Decide how many times per service you are prepared to restock from the reach-in, then hold at least that much between trips. For most bars the binding item is milk, and everything else combined is a rounding error against it.
- Match the door format to what actually lives inside. Drawers for the items touched every ticket, hinged doors for bulk and for anything tall. Mixing both formats along one run is normal and usually correct; the mistake is picking one format for the whole bar because it looked tidier on the drawing.
- Decide the condenser's air path BEFORE the joinery is drawn. Front-breathing units can be enclosed, others need clear air at the side or the back, and the cabinet must also be removable through the opening it sits in. Joinery is built once; refrigeration is replaced several times over the life of that joinery.
- In a hot venue, treat every self-contained unit as a heater installed inside the bar. It adds to the room's cooling load, it warms the air the barista is standing in, and it then works harder because it is drawing that warmed air across its own condenser. Where the bar is small, enclosed and busy, remote condensing stops being a luxury.
- Specify readable temperature indication, and logging or an alarm where the value of the prepped dairy justifies it. The limits themselves come from the site's own food-safety standard — this platform does not set them — but you cannot hold a team to a limit they cannot see, and a cabinet whose display is behind a door is a cabinet nobody checks.
- Buy serviceability. Gaskets are consumables and doors get dropped. Ask how a gasket is changed, whether shelves and rails come out for cleaning without tools, and whether the unit is on castors so it can be pulled forward. A cabinet that must be uninstalled to be cleaned behind is a cabinet that never gets cleaned behind.
- Solid doors unless the customer is genuinely meant to be looking. Glass under a bar top loses more heat, shows a shelf of cartons and earns nothing.
- Confirm the supply and the outlet position with a licensed electrician before the bar is built. A refrigeration cabinet set into fitted joinery cannot be shifted later to reach a socket, and the local authority governs what the supply has to be.
Directly under the working line and split by lane: dairy under the espresso station inside the steaming reach, cold-drink components under the cold lane. The test of the layout is that a barista can complete a whole milk drink and a whole iced drink without one step that crosses another person's path. Bulk lives in the reach-in and is brought forward between rushes — underbar is service stock, never storage.
- Building the joinery first and choosing the cabinet second. The air path and the removal route are decided by the carcass, and by then it is too late to change either.
- Treating underbar as storage. It is service stock; the moment it holds a week of deliveries the doors are open longer, the load rises, and nothing inside it rotates.
- Buying glass doors under the bar because they look considered. Nobody is looking, and you have paid for a cabinet that holds cold less well.
- Never cleaning the condenser. It belongs on the maintenance schedule, not on the list of things to do once the unit starts struggling — by then it has been running hot for months.
- Loading straight from a delivery so the shelves are packed solid. A refrigerated cabinet works by moving air; a full one has nowhere to move it and the middle of the load never gets there.
- Recording temperatures only at open and close because that is when the checklist asks. The failure happens in the middle of the rush, which is the one time nobody looks.
- Load depends on cabinet size, condenser type and how hard the unit has to work in the ambient it is placed in, and a run of underbar cabinets is several motors on one section of bar. Whether each needs its own circuit is a question for a licensed electrician and the local authority governs. This site does not specify amperages or phase.
- Defrost condensate has to go somewhere. Some cabinets evaporate it, some need a drain run, and a bar built without one turns a routine defrost into water behind the joinery. The connection is a plumber's call and the local authority governs.
- Set by the bar's own geometry — and the cabinet must pass through the opening it will sit in, both on the day it is installed and on the day it is replaced.
- Condenser air clearance is the manufacturer's figure and it is the one a joiner most often ignores. Confirm it against the drawing before the carcass is built.
- Self-contained units reject heat into the bar. In a hot climate that heat is a design input for whoever sizes the venue's cooling, and it should reach them in writing rather than as a surprise at commissioning.
- Cabinets are rated against a defined test-room climate. Ask the supplier which climate the rating was measured in, then compare it honestly with the room the cabinet will stand in during summer, behind a bar, beside an espresso machine.
- Hinged solid door vs refrigerated drawers
- A hinged cabinet opens the whole compartment to the room; a drawer opens only the volume of that drawer.
- Drawers cost more and hold less per metre of bar, and they pay it back where the unit is opened constantly — less cold air is dumped per access and the item is presented at the top instead of at the back of a shelf. Hinged doors win where the cabinet holds bulk: cartons, jugs, boxed juice, anything tall that a drawer cannot take gracefully.
- Refrigerated worktop vs plain cabinet
- A worktop version carries chilled inserts in the surface itself with cold storage underneath; a plain cabinet is storage only, under a normal bar top.
- The worktop suits a bar that assembles from prepped components — fruit, garnish, prepped dairy — because the inserts are the mise en place and nothing is opened to reach them. It is the wrong buy where the bar mostly holds sealed cartons and bottles: the inserts sit empty and you have paid for a surface you cannot use as a worktop.
- Self-contained vs remote condensing
- Self-contained carries the compressor and condenser inside the cabinet; a remote system puts them in a plant space and runs refrigerant lines to the bar.
- Every self-contained unit rejects its heat and its compressor noise into the room the barista and the customer are standing in. Remote condensing moves both out, which is why it turns up in tight, hot, customer-facing bars — and it converts a plug-in purchase into a refrigeration contractor's installation with pipework, commissioning and a service agreement.
- Front-breathing vs side- or rear-breathing condenser
- Where the unit takes in and discharges its condenser air.
- A front-breathing unit can be built into joinery on three sides; a side- or rear-breathing one cannot, and building it in anyway is how a new bar ends up with a cabinet that runs continuously and still drifts warm. This one detail decides whether the fitted bar you have drawn is buildable at all.
- The unit runs almost continuously and the compartment nearest the door is noticeably less cold than the back.
- Condenser starved of air by the joinery, coils blinded with dust, or a door gasket that no longer seals along its whole length.
- Money first — a compressor running continuously is one of the largest power draws you will add and it is wearing out early. Then stock: the cold chain is being lost at the door, which is exactly where the most-used product sits.
- Milk pulled from the underbar feels less cold in the jug during the busiest hour than it does at open.
- Access rate exceeding recovery — every opening dumps cabinet air, and in a rush the unit never gets a quiet minute to pull back.
- Quality and safety together. Warmer milk texturises differently and the barista chases it, and the product spends the busiest hour of the day drifting toward the limits your own food-safety standard sets.
- Water appears on the floor behind the bar, usually first thing in the morning.
- A blocked or absent condensate drain, or a defrost cycle producing more water than the evaporation tray can take.
- Downtime and a slip hazard, plus joinery that rots quietly for months before anyone lifts a kick plate.