Specifications

11
CRUV
TM
-DI TROUBLE-SHOOTING GUIDE
PROBLEM POSSIBLE CAUSE RECOMMENDED ACTION
Humidifier 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. (Air flow switch, high limit
humidistat, etc.)
Low water float switch Verify control voltage from float switch and transformer
secondary common.
Humidifier will
not fill
No water pressure at valve Check manual water supply. Valve, minimum 25 psi
water pressure.
Malfunctioning water float valve Check to make sure that valve float & stem moves
freely.
Plugged float valve Check float valve seat.
Water float 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 float valve Float ball has water leak. Float valve seat defective,
replace.
Water passing into overflow
stand pipe
Readjust float valve rod, so water level reaches 1/4-
3/8" from overflow edge when water is at ambient or
cold state. Excessive water pressure, 80 psi maximum.
Float valve stuck Obstruction will not allow float 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 wire
diagram ratings).
Malfunctioning control system Heater contactor not functioning, replace. Service
fuses blown. Auxiliary limit controls not allowing
system to operate (duct humidistat, air flow 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.