41
CRUV INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
LW series controller and RO/DI water
Table 41-1:
CRUV troubleshooting guide (RO/DI water option)
Problem
Possible cause
Recommended action
Humidifi er will not heat
Control transformer
Verify control voltage across secondary leads of transformer. Reset transformer
circuit breaker.
Humidistat is not calling
Set humidistat to call. Inspect for faulty humidistat.
Safety controls open
Check safety control. (Airfl ow switch, high limit humidistat, etc.)
Low water fl oat switch
Verify control voltage from fl oat switch and transformer secondary common.
Humidifi er will not fi ll
No water pressure at valve
Check manual water supply. Valve, minimum 25 psi water pressure.
Malfunctioning water fl oat valve
Check to make sure that valve fl oat & stem moves freely.
Plugged fl oat valve
Check fl oat valve seat.
Water fl oat valve does not
close
Open drain valve
Obstruction in drain valve will not allow complete closure, clean or replace valve.
Manual drain valve not closed
Close drain valve.
Malfunctioning fl oat valve
Float ball has water leak. Float valve seat defective, replace.
Water passing into overfl ow stand
pipe
Readjust fl oat valve rod, so water level reaches 1/4" - 3/8" from overfl ow
edge when water is at ambient or cold state. Excessive water pressure, 80 psi
maximum.
Float valve stuck
Obstruction will not allow fl oat valve to seat properly, clean or replace with new
seat.
Reduced or no output even
though water is at the proper
level
Heater malfunctioning
Verify that proper voltage is being applied to heaters. Check heaters (amp draw
and compare to wiring diagram ratings).
Malfunctioning control system
Heater contactor not functioning, replace. Service fuses blown. Auxiliary limit
controls not allowing system to operate (duct humidistat, airfl ow proving switch,
etc.). Reset, replace, or calibrate as required. Faulty or inaccurate humidistat,
replace or calibrate.
Time delay/interlock relays
Relay delay on time is 10-15 seconds. Check relays.
Low water cut-off switch
Check for proper operation.
MAINTENANCE
TROUBLESHOOTING:
Troubleshooting for CRUV with the optional Vapor-logic controller is included
in the
Vapor-logic Installation and Operation Manual
that was shipped with the
humidifi er.
Troubleshooting:
VAPOR-LOGIC CONTROLLER
