mr
.
steam
®
C U S E R I E S
Installation, Operating & Maintenance Manual
35
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 outline 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
tem-perature control.
c.There will be a red dot under “OUT2” on the Digi-
tal 1 Control when there is a call for heat.
d.Ensure, if equipped, the room Timer is On.
Digital 1
®
Control & Sensor:
Consult Factory
Heating Element
Turn off all power at circuit breaker.
Consult factory for resistance values.
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 12. 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.
4.
Check heating element for resistance values.
Consult factory for the resistance values for the
element speci-fications.
Prior to checking boiler disconnect
boiler from electric power supply at main safety
switch or fuse panel. Turn boiler switch to OFF.
CHECK
PC Board - Models CU360-1400
Prior to checking boiler disconnect boiler
electric power supplies at main safety switch or fuse
panel. Turn the boiler switch OFF.
1.
Turn the control voltage ON and turn the boiler
switch ON. Measure the voltage across "L1" and
"L2" on the 104460 board. The voltage should be
approximately 110 VAC.
2.
On the 104460 board, disconnect the wire from the
"LOW" terminal and check the voltage across "L2"
and "PUMP". The voltage should be approximately
110 volts (same as "L1" and "L2"). Connect a jumper
between the "LOW" and "GND" terminals. The
voltage between "L2" and "PUMP" should be zero.
3.
On the 104460 board, disconnect the wire from the
"LOW" terminal. There should be no voltage between
the "L2" and "CONT” terminals. Connect the jumper
between the "LOW" and "GND" terminals. The
voltage between "L2" and "CONT" should be 110V.
Low Water Cutoff, Water Feed and
High Water Cutoff Probes
Models CU360 through CU1400 are equipped with
two probes for low water cutoff (LWCO) and water
feed control. Models CU2000 through CU4500 are
equipped with one probe for low water cutoff (LWCO).
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. If model CU2000
through CU4500, drain the tank.
1.
Probes are located in the top of the generator for
models CU360 through CU1400. The probe is
located on the back side of the generator for
models CU2000 through CU4500.
2.
Remove probes using a standard spark plug
wrench. Care should be taken not to damage the
insulation.
3.
Check probes for deposits. Use emery cloth 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.
7.
To test AUX LWCO, press and hold the manual
reset button on the side of the steam bath generator
for 5 seconds.
