Float Assembly - Cleveland steamcraft 21-CET-8 Service Manual

Page 96 Model 21 -CET-8 Service Manual

Float Assembly

a. Set megohm meter (megger) at 500 or 1000 volts. If a megger is not
available, zero adjust an ohmmeter on the highest scale.
b. Check that the water in the float cylinder is at operating level.
c. Continue this procedure with step 8.
8. Refer to Figure 5-25, and check the insulation resistance of each heater and dryer
element lead to ground. Use the element assembly stud as ground.
• If the resistance is infinite (greater than 1 megohm) on all coils of the heater
element, the heater element is good. If the resistance is infinite (greater than 1
megohm) for the dryer element, the dryer element is good. Reconnect heater
and dryer leads. Make sure the connections are tight
• If the resistance is low (less than 1 megohm) on all coils of the heater element,
replace the heater element. If the resistance is low (less than 1 megohm) for
the dryer element, replace the dryer element. Connect the heater and dryer
leads. Make sure the connections are tight.
Before testing the float assembly, inspect the cylinder for sediment Sediment in the
float assembly cylinder often appears as white sludge. As sediment builds up in the
cylinder, the floats cease to slide up and down smoothly on the shaft The float
assembly does not properly respond to water level changes.
If there is heavy sediment buildup in the float cylinder
a. Refer to Figure 6-10. Disassemble and dean the float switch assembly, the
float cylinder, and the spray nozzle. If the components cannot be cleaned,
replace them with new parts. Reassemble the cleaned com ponents.
b. If the float cylinder required cleaning test the rinse solenoid valve for proper
operation.
When the float assembly is free of sediment, perform these test procedures.
1. Set the voltmeter to the 250 VAC scale.
2. Set the TIMED/MANUAL switch to the MANUAL position.
3. Set the ON/OFF switch to the OFF position. Wait for the 3-minute blowdown cycle
to finish, and the generator and float assembly to drain completely.
4. Connect the voltmeter across the float low level switch.
• For key pad timer units, refer to Figure 5-26 and connect the voltmeter leads to
the black wire connections at the high temperature limit switch and the
contactor.
• For mechanical timer units refer to Figure 5-27 and connect the voltmeter leads
to the black wire connections at the high temperature limit switch and the
TIMED/MANUAL switch.
5. Set the ON/OFF switch to the ON position, and check the voltmeter readings with
no water in the float cylinder.
• If the meter reads 120 VAC, continue this procedure with step 7.
• If the meter reads 0 VAC, continue this procedure with step 6.
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