Maytag MWF4200AWS Technical Information download pdf (Page 38)

4-6

Figure 4.4 – Water Filtration Cycle

4.4.2 Automatic Front / Backflush Cleaning Cycle (All Models)

The Automatic Front / Backflush Cleaning Cycle allows the MAYTAG Whole Home Water Filtration

System to operate for extended periods of time without System maintenance and/or replacement. Systems

applied to municipal, cistern, and well sources use this method for Automatic daily cleaning. The cycle

occurs once every twenty-four hours, at a time designated by the homeowner. A typical Double Front /

Backpulse sequence uses approximately 45 litres (12 USgal) of water.

Ideally, the flush cycle is programmed to occur at a time when household water is not being used and the

water pressure in the household piping and the MAYTAG Whole Home Water Filtration System is the

same as the water main pressure. Water taps may still be used during this time, but a slight drop in water

pressure may be noticed. The use of water taps during this cleaning cycle will not affect the cleaning or

performance of the MAYTAG Whole Home Water Filtration System.

The process is shown in Figures 4.6 and 4.7. The System Controller opens the Drain Valve (3), which

immediately drops the System pressure. The higher-pressure water upstream of the filter (1) immediately

rushes into the lower-pressure System (2) and then exits the System through the drain valve (3). This is

the Frontflush. At the same time, the higher-pressure water in the backpulse tank (4) rushes backwards

through the membrane (5) until the pressure has been equalized. This is the Backflush. These processes

together provide two important functions:

• Frontflush – Scours the outer surface of the membrane fibres and carries dirt particles to drain,

Figure 4.5 – Membrane Cross Section

(1)

(4)

(2)

(3)

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Maytag MWF4200AWS Technical Information Page 38