A low ice bin during lunch service does not tell you whether your Hoshizaki has slowed down or your restaurant is using ice faster. Start by separating those two questions. Compare production under recorded conditions, then decide whether you need a service visit or a capacity review. Adding refrigerant is not a diagnosis. Write down when the shortage begins, whether the bin was full at opening, and what changed that week. A new drinks menu, longer opening hours, or ice taken for another station belongs in the same record as a recent equipment repair. This gives the next person a problem they can investigate instead of a request to replace a guessed component. Use the complete model number Hoshizaki's KM-1300S_F service manual, revised December 2003 , separates the SAF air-cooled, SWF water-cooled, and SRF remote air-cooled machines, including their three-phase variants. Its performance tables on pages 43–48 also separate ambient temperature, inlet-water temperature, freezing time, and harvest time. Use the sheet for your full model, not just the KM-1300 family name. This is guidance for those documented legacy machines. It does not assign their specifications to a newer KM with a similar number. Photograph the accessible identification plate without removing service panels. Include the serial number when asking your provider to confirm which manual and revision apply. A useful comparison starts with a complete sentence: “This is our KM-1300SAF, and this is the table our technician used.” If the estimate only says “1,300-pound machine,” ask for the exact model and comparison conditions before using that number to justify a replacement. The bin is empty earlier, but production has not been measured For the next comparable shift, note the opening stock, approximate ice removed, any ice brought in, and the closing stock. Record discarded ice separately. Use the same measure consistently, and identify estimates as estimates. A photograph of the bin is useful context, but it is not a measured daily production result. Consider a simplified inventory example: a shift starts with 100 pounds, takes out 180 pounds, and ends with 40 pounds. With no deliveries or losses, production would be 120 pounds: closing stock plus withdrawals minus opening stock. These are illustrative numbers, not a Hoshizaki rating or a test procedure. Unrecorded deliveries, melt, and discarded ice make the estimate less reliable. Keep deliveries and losses in separate columns. In that same example, 20 pounds of purchased ice would lower the estimated machine output to 100 pounds. If staff also discarded 7 pounds not included in the withdrawals, the estimate becomes 107 pounds. Unknown melt still prevents this inventory calculation from serving as a controlled production test. If your records remain too approximate, ask for a controlled production assessment. Tell the technician about service interruptions and any periods when staff intentionally turned the machine off. Do not disable the bin control or other protections to keep it making ice for a test. Compare the conditions, not just the headline output The manufacturer's two-temperature table means a capacity comparison needs both the surrounding-air and supply-water conditions. A daily figure without those conditions is incomplete. Ask the technician to identify the appropriate table cell and record how the actual conditions were measured. Attach that comparison to your service request. “We used the rating printed on an old sales sheet” and “we measured below the model's expected output under matching conditions” support different decisions. The first needs a better baseline; the second warrants investigation of the measured shortfall. Record when the problem occurs as well as where. If the shortage appears only during the busiest hot-afternoon shift, preserve that detail. A quiet morning visit may not reproduce the same operating conditions or ice withdrawals. Ask for an assessment timed to the reported problem when practical. Ask which part of the cycle is taking longer A freeze-time observation alone leaves out the harvest interval. Ask your technician to report both, using the applicable model table, and to explain whether the observed timing accounts for the output complaint. You do not need to open the machine or change a timer to ask that question. In its low-production diagnosis on page 53, Hoshizaki lists several investigation paths, including condenser or filter condition, water conditions, and controls. Refrigerant charge is only one listed possibility. A slow cycle therefore supports a service assessment, not an automatic recharge. Request the finding and the result after correction in the same service record. For example: “Please document the measured production, the comparison conditions, what you found, and whether the result improved after the repair.” If the provider recommends more capacity, ask them to explain how the production assessment and your busiest-shift demand support it. If that assessment leads to refrigerant work, organize the machine's identity and service history with the equipment-specific refrigerant verification guide . Then use the service-scope and refrigerant-record checklist to review the proposed work. A low bin does not establish which refrigerant to buy or whether any is needed. Choose the next step from the evidence Your evidence What it supports Next action Earlier shortage, but only bin-level observations An unresolved supply-versus-use question Record a comparable shift; arrange a production assessment if estimates remain unreliable. A rating without the full model or test conditions An incomplete baseline Confirm the matching manual and temperature conditions. Measured shortfall under matched conditions A performance problem worth investigating Request findings for the whole cycle and a documented result after correction. Measured output is appropriate, but busiest-shift demand still exceeds supply A capacity and operating-plan discussion Review demand timing and storage needs with the equipment provider.