Miele G 7828
Miele · Model G 7828
Dispensing Systems Four liquid dispensing systems are included for automatic dosing of detergent, acid neutralizing agent, rinse aid, or other additives. For most glassware washing applications Miele recommends the use of a neodisher® brand detergent and a mild acid neutralizing agent to restore the proper pH balance to your glassware. Four 10 liter detergent/ additive containers are located in the base of the washer for convenient storage, and are connected to independent bellows-type pumps for precise dosing. Each siphon tube is colorcoded for operator convenience and safety. By having four dispensing systems available, several detergents can be ready-to-use for multiple cleaning requirements. Powerful Circulation Pumps As always, Miele has designed these washers with pumps that provide a high circulation rate, combined with gentle spray pressure. This ensures that glassware will be throughly cleaned, but not damaged. Water is delivered to the chamber through the upper and lower spray arms (400 liters per minute), and through direct injection units (600 liters per minute). A total of 1000 liters of water per minute is recirculated for extremely effective mechanical cleaning action. This is accomplished while using a mere 35 liters (9 gal.) of water per fill. Fresh Water and Boiler System The system includes water inlet valves for hot tap water, cold tap water and DI water. Between each cleaning stage (pre-wash, wash, rinse or final rinse) water is drained and fresh water is introduced for the next stage. Each fill is typically 35 liters (fills are adjustable from 25 to 55 liters) for economical water consumption. In addition, the Miele system includes a 30 liter boiler for pre-heating of DI water prior to the final rinse. These features help to ensure analytical cleaning results every time. Hot Wash and Rinse Water It is well known that hotter water generally provides for better washing and rinsing results. For this reason water temperatures are adjustable up to 95°C. Independent control of wash and rinse water temperature provides for maximum flexibility in wash program design to meet special cleaning requirements. Triple Filter System A triple filter system ensures that only clean water is introduced into the wash chamber. This system includes: ? Filters on all water inlet hoses to retain even the smallest particles before they enter the washer ? Filters in the base of wash chamber to capture residue so that it is not recircultated ? Filters upstream of circulation pumps to extend pump life Environmentally Friendly All Miele products are designed with the environment in mind. Water consumption – typically 9 gallons per fill, this washer utilizes less water than many other brands in its capacity range. This means you will spend less on purified water while conserving one of the earth’s vital resources. Detergent consumption – Low water consumption and high circulation rate enable these models to consume minimal detergent amounts. The detergent volume used varies depending upon the wash program, but typically ranges from 50 to 200 ml (2–8 fl. ounces) per cycle. Electrical Efficiency Low water consumption means that less energy is required to heat the water up to washing temperature. Double wall construction and thorough insulation also minimizes heat loss, conserving electricity. Basket Recognition System Many laboratories today are concerned with standard operating procedures or validation of processes. For this reason, equipment must be designed with features that minimize potential operator error. The Miele Basket Recognition System is a unique feature that allows only one predetermined wash routine to be run with a given mobile unit insert. This enables you to be absolutely confident that only the proper wash routine is being utilized. In order for the Basket Recognition System to be used, the user access switch is set to “C”, and the magnetic coding strip is set to match the corresponding predetermined wash program (a description of this simple process is outlined in the operation manual). When the mobile insert is rolled into the wash chamber, the washer automatically reads the magnetic coding strip and indicates that the wash program is ready to start. The user must simply press the door close button and the start button. If one laboratory within the facility requires a different washing protocol than another, a mobile unit could be designated specifically for that lab and set to run only the wash program needed for that ap.
Key tips
- ·A failed biological indicator means the entire load is not sterile - no exceptions, regardless of how the cycle printout looks.
- ·Door gasket wear is the most common real cause of a failed vacuum/pressure test - check it before deeper diagnostics.
- ·Water quality directly affects steam-cycle validity - don't ignore scale or mineral buildup.
Typical Failure Modes
Failure patterns typical of this equipment class - general BMET reference, not verified against this exact unit's own service history unless flagged. Severity is a category-level estimate.
Door gasket / seal leak
HighSymptoms: Pressure loss, long cycle, steam leak.
Root cause: Aged rubber gasket.
Steam generator / heater fault
HighSymptoms: No steam, low temp, cycle abort.
Root cause: Failed heating element or scale buildup.
Chamber temperature sensor drift
MediumSymptoms: Temp out of tolerance, failed Bowie-Dick.
Root cause: Sensor aging.
Water quality / feed fault
LowSymptoms: Scaling, conductivity alarm.
Root cause: RO/DI system failure.
Serviceable Parts & Consumables
The parts a BMET typically services on this class of equipment. Service class and relative cost are general engineering estimates for the category, not figures from this unit's documentation. Part numbers appear only when pulled from this unit's own service manual. Always confirm intervals and pricing against the manufacturer.
Steam generator heating element
Class Periodic replacementRel. cost $$$R&R Difficult
Vacuum pump & seals
Class Periodic replacementRel. cost $$$R&R Difficult
Chamber temperature sensor
Class Periodic replacementRel. cost $$R&R Moderate
RO/DI feed cartridge
Consumable.
Class Frequent wear itemRel. cost $R&R Easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Steam generator heating element | Periodic replacement | $$$ | Difficult |
| Vacuum pump & seals | Periodic replacement | $$$ | Difficult |
| Chamber temperature sensor | Periodic replacement | $$ | Moderate |
| RO/DI feed cartridge Consumable. | Frequent wear item | $ | Easy |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Daily biological and chemical indicator test loads
- ·Door gasket / seal inspection
- ·Steam trap and drain strainer cleaning
- ·Annual full PM and pressure-vessel certification
Troubleshooting Approach
A structured starting point derived from the failure modes above. Follow the manufacturer's service documentation for the actual procedure.
Symptom: Door gasket / seal leak
- Confirm the presentation - typically pressure loss, long cycle, steam leak - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: aged rubber gasket.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the door gasket / seal per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Symptom: Steam generator / heater fault
- Confirm the presentation - typically no steam, low temp, cycle abort - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: failed heating element or scale buildup.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the steam generator heating element per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Central Sterile Supply Department (CSSD)
- OR sterile core
- Satellite reprocessing areas
Documents & Manuals
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