Commercial ice machine installation requirements

A cafe, bar, or restaurant owner about to buy or place an ice machine needs the spot ready before the truck arrives. The usual miss is a 115 V cord machine on a shared outlet, a modular head with no matching bin, a gravity drain that has to go uphill, or an air-cooled head shoved against a wall. This page is that pre-install checklist, from public manufacturer manuals and spec sheets. It is not a permit drawing, not a plumber’s scope, and not a bid.

Pounds per day live on how to size a commercial ice machine. The bin that has to cover the rush lives on ice bin sizing. Undercounter versus a head on a bin lives on undercounter vs modular vs countertop. Cartridge choice lives on water filters and descalers. Heat rejection and once-through condenser water live on air-cooled vs water-cooled. A machine that is already in and short of ice lives on commercial ice machine not making ice.

Read the data plate, then the PDF that matches that serial. The rows below are the books and sheets we opened on 2026-10-06. A sibling suffix (air versus water, -1 versus -32, A versus W) prints a different voltage, a different drain, or a different clearance. Where two documents disagree, both cells are printed. We did not average them.

Electrical: 115 V is common here, and it is not a rule

Small cabinets in this directory are often 115 V / 60 Hz / 1 phase with a cord. Some of those same families also print a 208–230 V build. Some 115 V modular heads are hardwired with no plug. A larger head on a public Hoshizaki sheet is 208–230 V and hardwired. The nameplate and the current spec sheet govern. Do not buy the outlet from the form factor.

One larger public example, not a model in this directory: Hoshizaki KM-901MAJ on the KM-901M_J(3) spec PDF dated 07/08/19. Air-cooled, 208–230/60/1, 13 A, 20 A max fuse, 3 circuit wires including ground, voltage range 187–253 V, power cord not included. Cabinet about 30 × 27-3/8 × 32-1/2 inches. That is a different class from the KM-81 cord-and-plug undercounter. It is also not “every modular head.” KM-520MAJ is modular and still 115 V.

Dedicated-circuit language is also per book, not one VenueIce rule:

• Scotsman CU50 user manual: connect it to its own 115 V, 15 A circuit.
• Manitowoc undercounter IOM: a separate fuse or circuit breaker for each ice machine. In the GFCI paragraph, the circuit must be dedicated and sized properly.
• Hoshizaki KM-350/520/660 instruction: an independent power supply of proper capacity. Failure language in that book is a tripped breaker, a blown fuse, or damage to existing wiring.
• Ice-O-Matic CIM installation manual (9/2023): a dedicated circuit.
• The Scotsman Prodigy Plus E-series cuber manual we opened does not use the word “dedicated” on its electrical page. It does say permanently connected, and extension cords are not permitted.

GFCI is the same kind of split. The KM-81/116 spec says if a GFCI is required, a GFCI breaker must be used instead of a GFCI receptacle. The Manitowoc undercounter IOM does not recommend GFCI protection; if a code requires it, that book wants a panel GFCI breaker and not a GFCI outlet. The Ice-O-Matic CIM manual says the units are not approved for GFI outlets. Those are three manufacturer sentences. They are not a local electrical code. A licensed electrician reads the nameplate and the jurisdiction.

A Build.com reprint of a C0330 sheet prints an electrical window of −10% to +10% and a shipping weight of 160 lb. The Scotsman portal PDF we opened prints −5% to +10% and 155 lb. Retailer reprints drift. The portal PDF and the dataplate are what we are citing for C0330MA-1.

Water supply

Ice makers in these books want a cold potable line, a shutoff you can reach, and pressure inside that manual’s range. They do not want the dishwasher’s hot line. Inlet size is not one number.

Filtration is a separate decision from pipe size. Hoshizaki’s KM instruction says external filters, strainers, or softeners may be required depending on water quality. Ice-O-Matic’s CIM manual says a water filter system should be installed and points at Ice-O-Matic’s filter sheet; it also says reverse-osmosis water can be acidic and, if RO is used, that book wants the pH checked to a neutral 7.0. Scotsman’s E-series cuber manual says if you filter, filter the reservoir water, not the water-cooled condenser. Manitowoc’s undercounter IOM says local water conditions may require treatment to limit scale, sediment, and chlorine. Which cartridge, and the gallon rating, stay on water filters and descalers. A refrigerator filter is how that page says you starve pressure.

Leave enough extra supply line to pull the cabinet out. Hoshizaki’s KM instruction and Scotsman’s CU50 install steps both say that, in different words. A kinked line is a service problem before it is an ice problem.

Drain

Melt water and purge water have to leave. A drain that backs up melts the ice you just made. The slope, the fitting, and whether a pump is allowed change by manual. Check your local plumbing/health code and a licensed plumber before anyone ties these lines into the building drain. The sentences below are what the manufacturer books print. They are not a code interpretation.

Gravity first, pump only when that model’s book offers one.

• Scotsman CU50 is sold as a gravity model (CU50GA-1A) or a pump model (CU50PA-1A). Gravity tubing in that book is 5/8 inch ID and is not included. Restrictions, kinks, or a line that does not slope to the building drain back water into the bin and melt the ice. The pump model includes 3/8 inch ID tubing and can discharge as high as 10 feet above the machine. The same manual says pump models will pump one story (10 feet) high, and a gravity cabinet can be converted with drain pump kit A39462-021.
• Hoshizaki KM-81BAK spec lists an optional drain pump, HS-5061. That is an accessory on that sheet, not a pump you add to a KM-520 head because the KM-81 has one.
• Ice-O-Matic’s CIM installation manual says the use of condensate pumps for draining water is not recommended. Do not add a pump that book tells you not to use.

Separate lines, where the manual says so.

• Hoshizaki KM-350/520/660 instruction: the icemaker drain, the bin or dispenser drain, and the water-cooled condenser drain (if there is one) must be run separately. The condensation drain may tie into the icemaker drain or run alone. Horizontal runs need 1/4 inch of fall per foot. An air gap of at least 2 vertical inches should sit between the end of each of those pipes and the floor drain. Icemaker drain outlet on that page is 3/4 inch FPT, with a minimum 3/4 inch nominal ID hard pipe.
• Manitowoc undercounter IOM: run separate bin and water-cooled condenser drain lines. Drain lines must have a 1.5 inch drop per 5 feet of run and must not create traps. Vent the ice machine drain. Do not vent the condenser drain on water-cooled models. On the U140/190/240 connection table, the bin drain and the ice-making water outlet are each 1/2 inch FPT with 1/2 inch minimum inside diameter. That slope sentence is not Hoshizaki’s 1/4 inch per foot. Do not swap them.
• Scotsman E-series cuber manual (the C0330 book): air-cooled models have a single 3/4 inch FPT drain; water-cooled models add a 1/2 inch FPT condenser drain. Use rigid drain tubes. Do not tee the machine drain into the bin drain. Do not tee a condenser drain into the reservoir or the bin drain. Vent the reservoir drain; that book describes a vertical vent about 8–10 inches. Horizontal runs need 1/4 inch fall per foot. Follow local codes for the air gap at the drain receptacle. The potable inlet on that NSF note has a 1 inch anti-backflow air break inside the reservoir, which is not the floor-drain air gap.
• Ice-O-Matic CIM manual: route the bin drain, purge drain, and water-condenser drain individually to a floor drain. Vent them so they do not back up into the machine. Flexible tubing is not recommended. Purge drain minimum 3/4 inch OD; water-cooled condenser drain 1/2 inch OD minimum; bin drain fittings on Ice-O-Matic bins are 3/4 FPT, and the bin drain should be minimum 3/4 inch OD. The purge fitting is plastic: do not heat it, and do not over-tighten it. The CIM0430 reprint repeats ice-maker water out 3/4 inch FPT, and on the water-cooled diagram a condenser water out of 1/2 inch FPT.
• Scotsman CU50: “Often an air gap is required by local codes” between the drain tube and the drain receptacle, and gravity-drain air gaps are “typically required by local code.” That book does not print a 2 inch figure. Check your local plumbing/health code and a licensed plumber.

Manitowoc’s undercounter checklist asks whether a water-cooled machine has a separate condenser drain and whether the bin has a separate vented drain. Most small venues in this directory are air-cooled, so the condenser drain may not exist. If the sheet says water-cooled, it does. Condenser gallons are an air-cooled vs water-cooled topic, not a reason to guess the pipe size.

Clearance, ventilation, and the temperature that cuts production

Air-cooled machines dump heat into the room. The clearance number depends on where the air enters and leaves. A front-breathing undercounter is not a modular head that exhausts out the back.

Incoming water that is hot, or room air at the top of the range, is how the brochure pounds disappear. These are published pairs, not a universal percent:

The sizing guide is where a 90/70 kitchen gets planned. The not-making-ice guide is where a hot room or a blocked louver gets separated from a machine that makes nothing. Air-cooled vs water-cooled is the heat-rejection choice, including BTU/h examples already cited there (KM-81BAK 1,800, KM-520MAJ 7,000 on the product page we re-opened).

Head, bin, floor, and the path in the door

A modular machine is two purchases. Undercounter vs modular is the form. Ice bin sizing is how much storage the rush needs. Compatibility is a third list, and it is model-specific.

• KM-520MAJ product page, bins and dispensers sold separately: B-250, B-300, B-500, B-700, B-800, B-900, B-1150, B-1300, DB-130H, DB-200H, DM-200B. That HTML page says to consult the specification sheet for additional details. We did not confirm a top-kit requirement from the HTML alone. The same page says two of these heads may be mounted side by side. That is not a stacking claim.
• C0330MA-1 portal spec, modular bin options: B330P at 30 × 34 × 30 inches and 344 lb, and B530S or B530P at 30 × 34 × 44 inches and 536 lb. Add 6 inches of height for bin legs. The footnote says to contact Scotsman for bin-top requirements. The E-series manual says many installs need only the matching bin, some need an adapter, and this product cannot be stacked.
• CIM0430A reprint: a bin chart that marks some Ice-O-Matic bins “kit not required” (including B25, B40, B55 on the rows we could read) and BPF-1 on wider bins. Dispenser adapter kits are “see the Ice-O-Matic price list,” not a kit number we are inventing. The CIM installation manual says a thermostatic bin control kit should be installed if the head sits on a dispenser, and that a non-Ice-O-Matic bin or dispenser follows that manufacturer’s mounting instructions. Ice-O-Matic does not endorse stacking.

Level the cabinet the way its book says:

• Manitowoc undercounter IOM: screw the leveling legs on, then level front to back and side to side. The location has to support the machine and a full bin of ice. The machine must use legs or be sealed to the floor; if it is sealed, that book says the rubber bumpers on the bottom come off first. That seal sentence is the manual’s, and an inspector’s version of it is a local question. Check your local plumbing/health code and a licensed plumber.
• Hoshizaki KM instruction: a firm, level foundation. Level the dispenser or bin left to right and front to rear. Adjust the bin legs if you are using a bin.
• Scotsman E-series: set the bin legs or casters, set the head on the bin, bolt it down with the straps in the hardware kit, then level with the bin leg levelers. CU50: level the cabinet on its own levelers.
• Ice-O-Matic CIM manual: level within 1/8 inch in all directions. Leg height on the bin or dispenser is adjusted by rotating the foot. Secure the head with the mounting straps. That book wants the back of the ice machine flush with the back of the bin so the bin door stays stable when it is open.

Door and path. Measure the shipping carton on the current sheet, then walk that carton through the door, the turn, and the elevator. The cabinet on the brochure is smaller than the crate, and the crate is not always “width by depth by height” in the same order as the installed cabinet.

• KM-81/116 spec: KM-81BAK shipping carton (L × W × H) 27 × 21 × 39 inches. The installed cabinet on that sheet is 17-3/4 × 24 × 38-5/8 inches including 6 inch legs. Net / ship weight 92 / 125 lb.
• C0330 portal spec: unit 30 × 24 × 23 inches. Shipping carton 33.5 × 27.5 × 28 inches. Shipping weight 155 lb. The Build.com reprint we opened prints 160 lb. We are not picking one.
• KM-901MAJ spec: shipping (L × W × H) 33.5 × 33.25 × 38.5 inches. That head is not in this directory. It is here because the crate is the thing that has to fit through the door.
• KM-520MAJ product page prints a shipping weight of 175 lb and does not print a carton size. CIM0430 reprint prints an approximate shipping weight of 155 lb for CIM0430A and does not print a carton size. If the sheet in your hand has no crate dimensions, get them from the current PDF before you promise the doorway.

Do not invent a universal 36 inch door. The number is the carton on the sheet, plus whatever clearance you need to turn it.

Printable checklist

Print this list. The figures live in the sections above and on the spec sheet that matches the serial. A blank means “not confirmed for this serial,” not “skip it.”

1. Model and serial written down, and the PDF that matches them open. Not a sibling suffix.
2. Voltage on the nameplate: 115 V or 208–230 V. Circuit ampacity and max fuse from that plate, not from a different cabinet in the same brand.
3. Dedicated or independent circuit, if that model’s manual requires one. No extension cord. Cord-and-plug only if the sheet prints a plug (NEMA 5-15P on the KM-81 and on the NEO 115 V sheet). Hardwire if the sheet says no cord (KM-520MAJ, the CIM manual, the Prodigy E-series cuber manual).
4. GFCI only the way that brand’s book allows, then a licensed electrician if the jurisdiction requires one.
5. Cold potable water, shutoff you can reach, pressure inside the manual’s range, inlet size from that manual (1/2 inch FPT on the Hoshizaki KM modular instruction; 3/8 inch FPT on the Manitowoc undercounter, C0330, and CIM sheets we opened).
6. Filter planned from filters and descalers, not a random refrigerator cartridge. On a water-cooled Scotsman cuber, the E-series book says do not filter the condenser line.
7. Drain type: gravity, or a listed pump (CU50 pump to 10 feet, KM-81 HS-5061). Not a pump the CIM manual says it does not recommend.
8. Separate drains for bin versus head versus water-cooled condenser, where that manual requires them. Slope from that manual. Air gap: Hoshizaki prints 2 vertical inches; other books say follow local code. Check your local plumbing/health code and a licensed plumber.
9. Air path matches the cooling type. Front-breathing KM-81 is not a 6 inch side-clearance Prodigy and not a right-side CIM exhaust. Nothing stacked in front of the louver.
10. Room and water inside the manual’s range, and the 90/70 production cell used for a hot kitchen. Sizing if you are still choosing pounds. Not making ice if the machine is already short.
11. Bin or dispenser on the compatibility list, including a top kit, adapter, or dispenser bin-control kit when the sheet or manual calls for one. Bin sizing for how many pounds the rush holds. Form factor if you are still choosing undercounter versus modular.
12. Level per the manual (Manitowoc leg level; Ice-O-Matic within 1/8 inch; Scotsman bin leg levelers on the modular cuber). Floor can carry the machine and a full bin. Legs, or the seal the Manitowoc book describes.
13. Carton measured against the door, the turn, and the elevator. Use the shipping dimensions on the sheet. KM-81BAK crate 27 × 21 × 39 inches. C0330 crate 33.5 × 27.5 × 28 inches on the portal spec.
14. Clean plan after startup, from how to clean a commercial ice machine. Installation day is not the clean interval.

What this page is not

• Not an electrical design and not a plumbing design. Wire size, breaker type, and the air gap the inspector wants are a licensed electrician, a licensed plumber, and the manual for that serial.
• Not a health-code opinion. NSF marks and the installation manual are what you show an inspector. Check your local plumbing/health code and a licensed plumber.
• Not the sizing page, the bin page, or the cleaning page. Those links are above so this page does not restate them.
• Not a review and not a price.

Sources

1. Hoshizaki, KM-81/116 BAK spec PDF, dated 05/20/26 on the sheet — KM-81BAK 98 lb at 70/50 and 76 lb at 90/70; 115V/60/1, 2.4 A, 15 A circuit; 6.5 ft cord, NEMA 5-15P; ambient 45–100°F, water 45–90°F, pressure 10–113 PSIG, voltage 108–122 V; front clearance at least 12 inches, top at least 0.6 inch; optional drain pump HS-5061; shipping carton 27 × 21 × 39 inches (retrieved 2026-10-06).
2. Hoshizaki, KM-350/520/660 M_J instruction manual — hard-wired independent power supply; KM-520MAJ 115/60/1, minimum circuit ampacity 20 A, maximum fuse 20 A, voltage variation ±10 percent; 6 inch clearance rear, sides, and top on the air-cooled head; 24 inch clearance is the URC-5F remote condenser page; water 10–113 PSIG, 45–90°F; ambient 45–100°F; inlet 1/2 inch FPT, minimum 1/4 inch nominal ID; drains run separately; 1/4 inch fall per foot; 2 inch air gap (retrieved 2026-10-06).
3. Hoshizaki, KM-520MAJ product page — 115v/60/1, 10.6 A, 20 A max fuse, voltage 104–127 V, hardwired, no cord; ambient 45–100°F, water 45–90°F, pressure 10–113 psig; inlet 1/2 inch FPT; compatible bins and dispensers listed in the body; shipping weight 175 lb; heat rejection 7,000 BTU/h (retrieved 2026-10-06).
4. Hoshizaki, KM-901M_J(3) spec PDF, 07/08/19 — KM-901MAJ 208–230/60/1, 13 A, 20 A fuse, 3 wires, voltage 187–253 V, cord not included; 905 / 753 lb; 12 inch clearance; shipping carton 33.5 × 33.25 × 38.5 inches. Not a directory model (retrieved 2026-10-06).
5. Manitowoc, NEO 140/190 spec, 6501D 6/22 — UYF-0140A 137 / 100 lb; 115/60/1 at 5 A and 208–230/60/1 at 2.5 A; 6 ft cord and NEMA 5-15P on 115 V, 6 ft cord and no plug on 208–230 V; water 45–90°F, 20–80 psi; ambient 40–110°F; recommended 5 inch clearance and no minimum; air in the right, out the left (retrieved 2026-10-06).
6. Manitowoc, undercounter owner/installation manual, part 040005890 Rev 07 08/22 — 8 ft cord (115 V with NEMA 5-15P; 208–230 V with no plug); separate breaker; dedicated-circuit sentence in the GFCI paragraph; ice-making water 40–90°F, 20–80 psi, 3/8 inch FPT; drain drop 1.5 inch per 5 feet; separate bin and water-cooled condenser drains; airflow described as in and out the front; legs or seal to the floor (retrieved 2026-10-06).
7. Scotsman, CU50 installation and user manual — own 115 V, 15 A circuit; voltage 104–126; air 50–100°F (best 70–80°F); water 40–100°F; pressure 20–80 psi; 1/4 inch OD copper; gravity versus pump, including 10 feet of lift and kit A39462-021 (retrieved 2026-10-06).
8. Scotsman, C0330 spec PDF, form SIS-SS-PP-C0330 01-22 — C0330MA-1 115/60/1, MCA 14.3, max fuse 15; C0330MA-32 208–230/60/1, MCA 7.1; air-cooled 400 / 288 lb; water 20–80 PSIG, air 50–100°F, water 40–100°F, voltage −5% / +10%; carton 33.5 × 27.5 × 28 inches, ship weight 155 lb; bins B330P and B530 (retrieved 2026-10-06). A Build.com reprint of a C0330 sheet prints voltage −10% / +10% and shipping weight 160 lb (retrieved 2026-10-06). We did not merge those cells.
9. Scotsman, Prodigy Plus E-series modular cuber manual, models including C0330 — 6 inch side and back clearance, 12–18 inches for capacity, front-in / back-out; permanently connected, no extension cords; 3/8 inch FPT inlet, 3/4 inch FPT drain; do not tee into the bin drain; 1/4 inch fall per foot; cannot be stacked (retrieved 2026-10-06). Its C0330MA-32 MCA cell is 6.1, which does not match the 01-22 spec.
10. Ice-O-Matic, Elevation Series CIM installation manual, part 9081484-01 Rev. U, 9/2023, file read from iceomatic.com — ambient 50–100°F at 60 Hz; water 40–100°F, 20–80 psi; 3/8 inch potable inlet on the 22 inch and 30 inch diagrams; separate bin, purge, and condenser drains; 6 inch clearance and the Smart Harness exhaust options; dedicated circuit; no cord set; not approved for GFI outlets; level within 1/8 inch; condensate pumps not recommended; stacking not endorsed (retrieved 2026-10-06).
11. Ice-O-Matic CIM0430/0436/0435 spec, Webstaurant reprint Rev 9/17, part C002: cim0430_0435_0436-spec.pdf — CIM0430A 435 / 320 lb, 115/60/1, minimum circuit ampacity 11.0; CIM0436A 208–230/60/1, MCA 6.3; fuse-size figure 15 on that table; 6 inch air clearance; 3/8 inch FPT water in (retrieved 2026-10-06).
12. Existing VenueIce pages this article points at instead of repeating: how to size, ice bin sizing, undercounter vs modular vs countertop, how to clean, filters and descalers, air-cooled vs water-cooled, not making ice.

If two sheets disagree, use the PDF that matches the serial.