Kenmore 625.3847 owner manual HOW Your Reverse Osmosis System Works, Schematic

- HOW YOUR REVERSE OSMOSIS SYSTEM WORKS -

PREFILTER

Water from the cold supply pipe enters the RO as-

sembly prefilter first (FIG. 8 and schematic below).

The prefilter has a replaceable sediment cartridge

with activated carbon in its composition. The car- tridge (10 micron) removes sand, silt, dirt, other sedi- ments, and up to the ppm of chlorine shown in the

specifications from the feed water. Chlorine will de-

stroy the RO membrane. Filtered, clean, chlorine- free water flows from the prefilter, to the RO mem- brane cartridge.

IMPORTANT... See pref!lter maintenance, page 11.

REVERSE OSMOSIS (RO) CARTRIDGE

The cartridge inside of the RO housing is a tightly

wound special membrane. The membrane removes

the dissolved solids and organic matter when water

is forced through the cartridge. High quality product water (about I ounce per minute) exits the RO hous- ing and goes to the storage tank or to the postfilter

and RO faucet. Reject water, with the dissolved sol-

ids and organic matter, is routed through the flow control and to the drain.

STORAGE TANK

The storage tank holds up to 2.3 gallons of product

water. A diaphragm inside the tank keeps water

pressurized to about 30 psi, when the tank is full, to provide fast flow from the RO faucet. The tank when

empty, is pressurized to 5 - 7 psi.

POST FILTER

After leaving the storage tank but before going to the

RO faucet, product water goes through the post filter.

The post filter is an activated carbon type filter. Any

remaining tastes and odors are removed from the

PRODUCT

WATER

FAUCET

product water. Taste-free, odor-free,clean, high

quality drinking water is available for use.

FAUCET

The sink or countertop faucet has a hand operated,

spring-loaded closed lever to prevent the waste of

drinking water. You can also keep the faucet open by

pushing upward on the lever and locking it against the faucet spout.

To comply with plumbing codes, an air- gap is built into the faucet drain water connection.

SHUTOFF ASSEMBLY

To conserve water, the drinking water system has an

automatic shutoff system. When the storage tank has

filled to capacity, and the drinking water faucet is

closed, pressure closes the shutoff to stop flow into

the RO. Pressure in the storage tank is about half of

the water supply pressure. After drinking water is

used, and pressure in the system drops, the shutoff opens to allow water flow again.

CHECK VALVE

A check valve (FIG. 10) is located in the outlet end of

the RO housing, opposite of the cap. The check valve

prevents a backward flow of product water from the

storage tank. A backward flow could rupture the RO membrane.

FLOW CONTROL

Water flow through the RO membrane is regulated

by the flow control. It maintains the desired flow rate

to obtain the highest quality drinking water. The

flow controlis located in the end of the 1 / 4" red drain

tubing, at the RO housing drain port. A small cone- shaped screen fits over the end of the flow control to

help prevent plugging with drain water sediments.

. REVERSE OSMOSIS

	'1		,,la=_l,,.	YELLOW	,,ele	II./1' d_a,_nt_oOlW				SCHEMATIC
						rl]_ _'w	RO MEMBRANE
						[' l&l &t'*,I .q.._	.,__.			.__._
					check	I_I:___ " ;_	f	f	_	•
		_	PRODUCT WATER		valve_._O	_= - --	_.--	--	_t=--	-- --
gravity	BLUE
drain
				1
					l,_p	AUTOMATIC		[_	,,,,e=
				GREEN		SHUTOFF		[_
			WATER
			IN			REFILT:		I

10