This article is taken from the installation guide for a Midmark M11 steam sterilizer.

Midmark M11 “NS” Installation Guide Leave a comment

In this article, we’re going to show you how to properly install your Midmark M11 Autoclave. We’ll show you the manufacturer recommended way to install your unit into a proper area. Covering everything from what makes a proper installation environment to powering the unit and adapting to its user settings.



Operating Environment

Ambient Temperature Range: 68°F to 104°F (+20°C to +40°C)

Relative Humidity: < 80% (non-condensing) (Pollution Degree 2, in accordance to IEC664)

Normal Operating Altitude: < 9842 ft. (3000 m) above sea level

Device approved for INDOOR USE ONLY.

Device to be operated in relatively dust-free environment. (Pollution Degree 2, in accordance to IEC664)

Device should be connected to a power source with over-voltage limits less than 1500 watts from mains to ground. (Installation Category II in accordance to IEC664)

The M9/M9D and M11 will emit 5000 BTU / HR during operation.


Location Requirements

Support Surface

  • Material should be water-resistant material. (Ex. laminate, stainless steel, stone, etc.)
  • Surface must be level to ensure chamber fills with correct water level.

Improper water level in the chamber could cause a sterilizer malfunction.

  • Surface should meet minimum dimensions listed below:


Depth (front to back) M11 – 18” (46 cm)

Clearance Requirements

To ensure proper air circulation and to allow access to the reservoir fill port and drain coupling, adhere to the minimum clearance requirements listed below. If the sterilizer will be operated
in continuous cycles, locate sterilizer where steam will not damage materials or equipment in the surrounding area.

  • Back of Unit – Back Wall…………………………… 2” (5 cm)
  • Front Support Surface – Front Sterilizer …….. 1” (3 cm)
  • Sides of Unit – Side Wall ………………………….. 2” (5 cm)
  • Distance above Unit for Printer Access………. 5” (13 cm)
  • Maximum Upper Cabinet Shelf Overhang ….. M11® – 18” (46 cm)
  • Under Cabinet or Shelf…………………………….. M11® – 23” (58 cm)

Relocation Requirements for Sterilizer

Disconnect power cord from electrical outlet and allow sterilizer to cool. Drain water from reservoir or do not tip sterilizer, allowing water to spill.


Electrical Requirements


Connecting the Power Cord 


For optimal performance, allow sterilizer to reach room temperature before operating.

To connect the power cord…

A.) Plug power cord into receptacle on back of sterilizer.

B) Plug power cord into a properly polarized and grounded receptacle rated for a minimum of 15 amps. A dedicated circuit only used for the sterilizer is recommended.

C) M11 are not equipped with an on/off switch, the display operates of very low power. (example: microwave oven display)

Note: When power is connected, the messages shown below will appear on the display.

* These screens will display the total number of cycles run on the unit, the model number (M11), the software version number, serial number date and time.


User Settings

User setting mode will enable the user to set the desired unit of measure and adjust the time clock. To enter the user settings mode, unplug and replug the power cord while pressing and holding the “+” button until the User Settings screen below appears.

If you have any questions about this procedure or any other Midmark M11 Tech Issues please contact us and let us help.

Check out our Free Preventative Maintenance Program here. 

Check out our Autoclave Technical Support Program here. 

Check out our Virtual Tech Assistant, Stanley Sterilizer here. 

The Midmark M11 autoclave is available here. 

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