Mr
S
team CU Series
Installation, Operating & Maintenance Manual
Check
29
PC Board
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Models CU 360, CU 500, CU 750, CU 1000, CU 1400
1.
Turn the control voltage "ON" and measure the voltage across "L1" and "L2".The voltage should be approximately
110 VAC.
2.
On the water feed control, disconnect the wire from the "H" terminal and check the voltage across "L2" and
"FILL".The voltage should be approximately 110 volts (same as "L1" and "L2"). Connect a jumper between the "H"
and "C" terminals.The voltage between "L2" and "FILL" should be zero.
3.
On the LWCO (heat control), disconnect the wire from the "L" terminal.There should be no voltage between the
"L2" and "HTR" terminals. Connect the jumper between the "L" and "C" terminals.The voltage between "L2" and
"HTR" should be 110V.
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Checking Low Water Cutout, Water Feed and High Water Cutout Probes
Models CU-360 through CU-1400 are equipped with two probes for low water cut-off (LWCO) and water feed
control. Failure to clean the probes may result in generator not operating, overflow or element failure.
Turn off all power supplies to steam bath generator and
release pressure to zero (0 psig) before removing probes.
1.
Probes are located in the top of the generator. Remove covers and disconnect wires from probes.
Note wire connections.
2.
Remove probes using a standard spark plug wrench. Care should be taken not to damage the porcelain insulation.
3.
Check probes for deposits. Use emery paper to clean probes.
4.
Remove and flush probe isolator (thoroughly) with water. If clogged, use a long piece of wire to remove
obstruction. Replace if necessary, center probe rod in isolator tube.
5.
Use teflon tape on probe threads and reinstall.
6.
After installation, make sure probe is not touching ground.With generator drained and probe wires
disconnected, there should be no resistance (X) between probe and ground. Check for leaks.
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Steam Solenoid Valve
1.
Check voltage rating of solenoid valve (120 VAC for United States, Canada, Mexico; may be 220-240 VAC for other
countries).
2.
Check voltage across solenoid coil.
a. If there is voltage across coil and valve does not allow passage of steam, check for clogged valve. Clean out
line with bottle brush. If solenoid valve is still malfunctioning, the valve is defective and should be replaced.
b. If there is no voltage across coil, check room temperature control.
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F1 Plus Control
1.
Check voltage rating of solenoid valve (120 VAC for United States, Canada, Mexico; may be 220-240 VAC for
other countries).
2
. Check voltage across solenoid coil.
a.
If there is voltage across coil and valve does not allow passage of steam, check for clogged valve. Clean out
line with bottle brush. If solenoid valve is still malfunctioning, the valve is defective and should be replaced.
b.
If there is no voltage across coil, check room temperature control.
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Heating Element
1.
Check power voltage across heating element terminals. Refer to nameplate data for voltage rating.
Voltage should be as marked on nameplate.
2.
Using an ammeter, measure total current draw as per nameplate rating. (See also Amperage Chart, page 7)
Each leg should register about the same current reading.
3.
If there is more than one heating element, check amperes of each element. Each leg of the same element should
register about the same reading for that element. Reading may be different from other elements due to KW
(Kilowatt) rating of individual heating element.
!
CAUTION
