A large floor type mixer must be what if it cannot be easily moved?

In a situation where a large floor type mixer cannot be easily moved, it is crucial for safety and stability to ensure that the equipment is secured. Sealing the mixer to the floor helps prevent any accidental movement during operation, which could lead to spills, accidents, or damage to the mixer itself or surrounding equipment. This practice is especially important in environments where heavy machinery is used, as the forces generated during mixing could cause instability if the mixer is not properly anchored.

The other options may not address the safety concerns associated with a large, heavy mixer. Leaving it unanchored can lead to hazards or equipment malfunction, moving it every week would be impractical and could pose additional risks, and simply installing it in a designated area does not provide the necessary stability that sealing it to the floor would ensure. Therefore, sealing the mixer to the floor is the appropriate action to maintain safety and operational efficiency.