Table 3-1. Direct Support Troubleshooting - continued
TEST OR INSPECTION
CHEMICAL FEED PUMP ASSEMBLY
CHEMICAL FEED PUMP STOPS AND/OR FAILS TO START.
Check if circuit breaker, CB7 and/or heater assembly are tripped.
If circuit breaker or heater assembly is tripped, go to Malfunction 2, Chemical Feed pump assembly.
Check if other pumps operate.
If other pumps are inoperable, go to Malfunction 1, ROWPU Assembly.
Step 3. Check if relay, K7 is ON.
If relay is not ON, go to step 7.
Check if 115 VAC is available between TI and T4 on motor starter.
If voltage is measured, go to step 6.
Perform a continuity check of power circuit as follows. Make additional point to point checks as necessary
to find defective component:
High voltages in this equipment can cause serious injury or death. When applying power
during a test, take proper measures to ensure safety of personnel. Never work on
electrical equipment unless there is another person nearby who is familiar with the
operation and hazards of the equipment.
To check continuity through K7, it is necessary to physically close contact by pushing in
on relay plunger while making the check.
L2, K7 -
Tl on Heater
T4 on K7
L2 (Models WPES-20 and H-9518-2)
If continuity is absent through heater assembly, replace defective heater (Paragraph 3-53) and reset
3-38 Change 1