American Dryer Corp. AD-840 User Manual

Page 22

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4. Reverse Osmosis (R.O.) Membrane

Test:

Microprocessor monitors total dissolved solids (TDS removal capability; owner needs
to RECORD FLOW RATE OF PRODUCT WATER 24 TO 48 HOURS INTO
NEW MACHINE OR MEMBRANE USE. EVERY TWO MONTHS THE FLOW
RATE IS TO BE MEASURED and if the rate is lower than the initial rate by at least
15%, temperature compensated, the membrane needs cleaning (see section on R.O.
Membrane on page 24).

Replace/Clean

Clean at least once a year. See cleaning procedure in section on R.O. membrane.

Frequency:

Replace if both acid and alkaline cleaning do not return the flow rate or TDS to normal
levels, indicating membrane damage.

Failure Mode:

Clogged, either through mineral or biofouling, thereby reducing yield, or damaged by
by chlorine, thereby raising TDS level in the product water.

WARNING: FLUSH ALL REPLACEMENT MEMBRANES BEFORE USING. UNPLUG

MACHINE AND FOLLOW STEPS 6 THROUGH 10 OF THE INSTALLATION
PROCEDURE REGARDING SYSTEM FLUSHING. (see pages 13 and 14)

ATTENTION: TO REDUCE BIOFOULING, IT IS RECOMMENDED THAT A MINIMUM

OF 12 GALLONS BE VENDED EVERY 72 HOURS. THE LESS THE IDLE
TIME BETWEEN VENDS, THE LESS LIKELY BIOFOULING IS TO
OCCUR IN THE R.O. MEMBRANE AND FILTERS.

5. Vent Filter

Test:

Open cap on filter and visually inspect for dirt accumulation. Check monthly.

Replace/Clean

Replace as required and at least once a year. KEEP FILTER DRY. A WET FILTER

Frequency:

IS A CLOGGED FILTER.

Failure Mode:

Clogged, and cause the pump to created a vacuum in the water storage tank, which
may collapse and crack the tank.

6. Polishing Filter

Test:

Check by tasting the vended water; replace when odor is detected in the dispensed
water. Check monthly.

Replace/Clean

Replace as required and at least once every three months.

Frequency:

7. Ultraviolet (U.V. Sterilizer)

Test:

Full automatic LED on side of sterilizer indicates strength, and microprocessor will shut
vending machine off, if strength of sterilizer light is below the required level. CHECK LED
MONTHLY.