Maytag MWF4200AWS Technical Information download pdf (Page 54)

5-4

Specialty Media Filter (not provided) – These types of water conditioners include softeners and

manganese greensand filters. Depending on the type of media filter, different water quality concerns such

as hardness, iron, manganese and hydrogen sulphide can be addressed. These filters should be installed

immediately downstream of the household pressure tank and upstream of the MAYTAG Whole Home

Water Filtration System.

Inlet Solenoid Valve (provided) – The Inlet valve is installed directly upstream of the MAYTAG Whole

Home Water Filtration System and is connected to the Inlet pipe assembly using a ¾” MNPT brass nipple.

Check Valve (provided) – The Outlet port also has a check valve. This will prevent air getting into the

water pipes of the house during the draining function.

Advanced Controller (provided) – Due to the higher fouling nature of surface water sources, the

MAYTAG Whole Home Water Filtration System requires more rigorous daily flushing.

External Prefilter Housing + Filter (provided) – All surface water systems must have an External

Prefilter installed. The External Prefilter Housing provides additional protection to the MAYTAG Whole

Home Water Filtration System from contaminants such as zebra mussels and other larger particles that are

seen in surface water sources. This prefilter is installed between the manual inlet ball valve and the

Automatic System Inlet Valve.

See section 4.8 for System Design Parameters.

When treating surface water sources, a maximum prefilter mesh size of 30 microns is required. Failure

to provide this level of prefiltration may lead to System damage. A damaged System will not perform

effectively, endangering the homeowner through possible serious personal injury and/or even death.

5.2.3 Pump/Pressure Tank Systems

5.2.3.1 Operational Theory

The operation of pump systems is very simple. The pressure in the system pressure tank (holding tank) is

maintained between a high and low-pressure setting using a pressure switch and a pump. When the system

pressure falls below the low-pressure setting, that is, when the household uses water, the pressure switch

mechanically closes an electrical contact, energizing the pump. When the pressure high setpoint is reached

by pumping water into the pressure tank, the switch mechanically opens the de-energizing pump. Pump

systems always operate in this fashion, regardless of the type of pump.

Systems are typically designed so that the pump operates for approximately 2 minutes before the tank is

full and does not turn on again for another minute during constant water usage. This operation ensures that

the electrical components of the system do not overheat.

5.2.3.2 Pressure Switch Review and Settings

There are a number of pressure ranges that are typical in houses, depending on the type of pump used,

system pressure losses, and individual homeowner preferences. Standard settings provide a 140 kPa (20

psi) difference between the high and low pressure setting. This setting allows for optimum pump operation

as described above (2 minutes on and 1 minute off cycling). The typical low/high-pressure settings that are

seen in households, depending on the pump type, are:

• 138 kPa / 276 kPa (20 psi / 40 psi)

• 206 kPa / 345 kPa (30 psi / 50 psi)

• 276 kPa / 413 kPa (40 psi / 60 psi) - recommended

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Maytag MWF4200AWS Technical Information Page 54