Maytag MWF4200AWS Technical Information download pdf (Page 39)

4-7

• Backflush – Expels trapped dirt particles from the Water Filtration Membrane pores so that the

front flush can carry them to the drain.

Figure 4.7 – Front / Backflush Cleaning Cycle

4.4.3 Automatic Drain Cleaning Cycle (MWF 4300 AWS only)

The Drain Cleaning Cycle was developed to supplement the Front / Backflush cleaning cycle. This

additional cleaning step addresses source related water problems associated with raw lake and river water.

This rigorous cleaning method involves completely draining the System. It aids in extending the membrane

life by physically scouring the sticky organic and / or mineral particles from the membrane surface and

sending them to drain during every automatic cleaning cycle. A typical Double Front / Backpulse Drain

Cycle uses approximately 64 litres (17 USgal) of water.

The flush cycle should be programmed to occur at a time when household water will not be 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. The water supplied to the rest of the house is temporarily cut off during

the Automatic Drain Cleaning cycle while the System drains and refills itself.

In all drain cleaning cycle cases, the Advanced Controller is required. It initiates a series of Front /

Backflush cycles to loosen and expel any particles from the MAYTAG Whole Home Water Filtration

System pores. See 4.4.2 Automatic Front / Backflush Cleaning Cycle for more information. The process is

shown in Figures 4.8 and 4.9. The Controller then initiates a complete System drain by closing the

Automatic Inlet valve (1) and opening the Automatic Drain Valve (2). As the water exits the Drain Valve,

the Air Vent allows air into the System (3) to prevent a vacuum from forming. The System drains until it is

(1)

(2)

(3)

(4)

(5)

Figure 4.6 – Membrane Cross Section-Backflush

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Maytag MWF4200AWS Technical Information Page 39