American Dryer Corp. AD-840 User Manual

Page 44

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Fax: (508) 678-9447

SECTION XI

TROUBLESHOOTING

NOTE: WATER STORAGE TANK WILL NOT FILL UP COMPLETELY. THERE ARE

SEVERAL INCHES OF SPACE BETWEEN WATER TANK COVER AND “FULL”
WATER LEVEL.

NOTE: THERE IS A 30 SECOND TIME DELAY BETWEEN THE SIGNAL TO START THE

R.O. PUMP AND THE ACTUAL RUNNING OF THE PUMP. THIS IS TO PROTECT
THE PUMP FROM TURNING ITSELF ON AND OFF REPEATEDLY IN A SHORT
TIME AND BURNING ITSELF OUT IN SITUATIONS OF LOW INLET PRESSURE
OR HIGH OUTLET BACK PRESSURE.

PROBLEM

1. Water storage tank is not full, and R.O. pump is not running.

CAUSE

A. No water supplied to pump.
B. No power.
C. Excessive outlet pressure. Pressure gauge at the outlet of the pump will indicate 190 psi or more.

CORRECTION

A. Check if there is water going into the machine. Open inlet ball valve if it is shut off. Check

operation of inlet solenoid and replace if necessary.

B. Check to see if the machine is plugged in. Check fuses. Also, machine will not run if any one of

the three safety switches is activated indicating overflow:

i. at the base of the machine,
ii. at the top of the reservoir tank,
iii. closest to top in the water tank.

Correct overflow situation

C. Check for obstructions in line beyond the pump. Check drain line.

WARNING: THE R.O. PUMP WILL NOT RUN IF THERE IS MORE THAN 190 PSI IN THE

LINES BEYOND IT. THIS MEANS THAT BETWEEN THE PUMP AND THE
OBSTRUCTION THERE IS AT LEAST 190 PSI IN THE TUBINGS. TAKE ALL
PRECAUTIONS AND WEAR EYE PROTECTION WHEN WORKING ON THE
PROBLEM.