Approximately 30 seconds after the contactor pulls in, the fill valve coil should energize. There is also a
visible fill relay on the printed circuit board. It is the one located farthest from the C.T. core. The points on
this relay must be touching in order for the fill valve coil to be energized. If the points do not touch after
the built-in time delay, the sensor input may be interfering. To confirm, remove the black and red sensor
wires from terminals 6 and 10 on the PC board. Wait 30 seconds and, if the fill relay points do not touch,
replace the sensor. If they still do not touch, the basic PC board may be faulty. To confirm, disconnect the
red wire from terminal 18 and touch it to terminal 14. If the fill valve coil activates, the basic PC board
should be replaced. If it still does not activate, the fill valve coil should be replaced. After the necessary
components have been changed, water will start filling the cylinder and begin to submerge the
electrodes. Because of the high-voltage across the electrodes, the water can now conduct electricity.
Red “Change Cylinder” light on—Water at top of cylinder:
This is a common occurrence on start up. See Start-up on page111.
Water remains at high level and won't concentrate:
This is normal on cold start-up and can be accelerated by adding a maximum of 1/2 tsp. of dissolved salt
to the cylinder on fill cycle through the plastic fill cup. See Low Water Conductivity on page83.
If the unit has been operating extensively, observe for normal fill-boil-fill-boil cycle; no drainage should
occur. If drainage occurs, check for leaking drain valve or back pressure.
Unit drains continually:
May be caused by foaming and/or back pressure or by a leaking drain valve.
If cylinder is almost empty, check for magnetic pull on drain solenoid indicating miswiring. If there is no
pull, drain actuator is blocked open; remove, disassemble and clean.
If drain is occurring through activated drain valve, valve is miswired or electronics are faulty; consult
factory.
If drain is occurring through the overflow on the fill cup, this is due to abnormal restriction on the steam
line and back pressure forcing water out of the cylinder so water cannot concentrate and level remains
high. Review installation of steam line to ensure there are no blockages or excessive static pressure in the
air system.
Vertiv | Liebert CRV Installer/User Guide | 90
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