Table 3-2. Troubleshooting (ROWPU) (continued)
TEST OR INSPECTION
BACKWASH WATER FLOW READING DROPS TO NEAR ZERO DURING BACKWASH
OPERATION; BACKWASH PUMP LAMP IS ON.
Check for closed or clogged valve on tank.
a. Open closed valve by turning handle fully to the left until it stops (counter
b. Clean clogged valve.
Check for clogged strainer or BACKWASH PUMP suction opening (para. 3-6).
a. Flush strainer with product water to remove debris.
b. Remove debris from suction opening.
Check level of water in backwash water tank.
On ROWPUs having mechanical backwash timers (Model No 600-1) there is a
period of about 2 minutes during the backwash cycle when the backwash flow
gage reads 0 while the backwash pump is on; this is a normal part of the cycle.
In units having the solidstate timer (Model 6003), there is a period of about 15
seconds when the flow gage will drop to 0 before returning to a normal
reading. This is normal.
If water level is below backwash pump intake, immediately shut off backwash
pump. Patch any leaks in backwash water tank (para. 3-8). Fill tank with raw
water and continue backwash operation.
Check for leaking hose.
PUMP LAMP IS
Replace defective hose.
NOZZLE DELIVERS LITTLE OR NO PRODUCT WATER; DISTRIBUTION
Check for water level below distribution pump intake in product water tank.
a. Patch any leaks in product water tanks.
b. Continue operations to produce product water.