Maytag MWF4200AWS Technical Information download pdf (Page 94)

6-3

6.2 Winterization Procedure

All service and maintenance is to be performed by a MAYTAG Services Qualified Service Technician.

Some of the necessary tools required are available for purchase from MAYTAG. If the Stainless Steel

Prefilter requires cleaning, you may want to collect enough water in a suitable container from a tap for

cleaning the Stainless Steel Prefilter prior to beginning this procedure. All water in the house will be shut

off for the duration of this procedure. Be sure to wear clean waterproof gloves during this procedure and to

read through the procedure first before beginning.

Never use any AUTOMOTIVE type antifreezes when winterizing drinking systems. This may result in

serious injury or death.

The use of cheaper ‘non-propylene glycol based’ plumbing or RV antifreezes may damage the System’s

internal components voiding all warranties. Antifreeze used must be plumbing antifreeze, rated for –50

C (-58 F), consisting primarily of propylene glycol and must not contain any ethanol or alcohols.

Propylene glycol (preservative) will provide protection of the System against freezing down to –40

C (-

40 F) as long as the proportion of preservative to water is correct. The amount and concentration of the

preservative solution has been selected to take into account water that is not easily drained from the

System. This procedure only protects the MAYTAG Whole Home Water Filtration System from

freezing and does not protect the rest of the household distribution system.

Do not use hot water during commissioning or maintenance of the System. It is possible that if a hot

water tap is used, high levels of factory preservative, chlorine or MAYTAG MC1 Cleaning Solution will

enter the hot water tank and may cause personal injury, illness and/or death. It is recommended to close

the hot water tank inlet valve during commissioning or maintenance of the System and to reopen the hot

water tank inlet valve at the end of the procedure.

When filling the System, fill the System slowly and watch for leaks to avoid excessive water dripping

onto floor.

During this procedure, DO NOT open the Bypass Valve, as this will allow potentially contaminated

water into the household distribution system. Contaminated water may lead to personal injury and/or

death.

Chlorine bleach must be in the house for less than 3 months. The active percentage reduces with time.

This procedure does not disinfect all of the household pipes. It is strongly recommended that all of the

pipes are sanitized as water left in pipes may be microbially unsafe.

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

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

effectively, endangering the homeowner or occupant through possible serious personal injury and/or

death.

Do NOT allow the preservative (plumbing antifreeze) to drain onto the ground, into a septic bed, storm

sewer or any body of water. Check the plumbing antifeeze manufacturers directions and warnings for

more information.

Bypass

Valve

Inlet

Valve

Inlet

Valve

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Maytag MWF4200AWS Technical Information Page 94

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