TABLE 3 – HUMIDIFIER TROUBLESHOOTING GUIDE
Problem
Possible Cause
Humidifier is not satisfying
Control setting is too low .
demand .
Control mounted in wrong
location .
Short run times .
Humidifier capacity limited
by input power (120V) .
Excess humidity .
Control setting is too high .
Control mounted in wrong
location .
Solid red Fill light .
Fill valve has been filling for
40 minutes .
Low spot in steam hose
collecting water .
High static pressure in the
duct is causing back pressure
in the duct .
Solid red Service light .
Unit senses current 120%
above nominal and cannot
lower amperage after three
drain cycles .
TABLE 4 – FAN PACK TROUBLESHOOTING GUIDE
Problem
Possible cause
Tubing connection
Fan not operating
Water dripping from Fan
Steam outlets blocked
Pack
Foaming in canister or steam
hose
Air drafts in the space
Wiring
Steam Humidifier power
No humidity call
Fan does not operate
Circuit board output
Motor failure
Fan noise
Noise
Gurgling
28 English
Action
Adjust control to higher setting .
See Installation Instructions with control for correct mounting location .
Use blower activation feature on ADHC or run constant fan .
Operate humidifier on 208/240 volts .
Increase capacity to 16 . 0 amps . Make sure breaker is appropriately sized .
Adjust control to lower setting .
See Installation Instructions with control for correct mounting location .
Make sure high water pin wire is securely installed .
Support steam hose along its length ensuring 2" per foot slope from the dispersion tube to the
humidifier .
Make sure dispersion tube is not discharging into a duct with greater than 2 . 0 in . w g . static
pressure .
Make sure dispersion tube tubelets are pointed up .
Rinse canister to remove mineral deposits or install a new canister .
Action
Check all connections .
See "Fan does not operate" .
Clean steam dispersion manifold outlet .
Rinse components with clean water .
Do not install near supply ducts or ceiling fans .
Check wiring .
Check that the Steam Humidifier is powered and on .
Adjust humidistat setting . Check location of humidistat .
Confirm 24 VAC output from the Steam Humidifier FAN PACK terminals during a call for
humidity . Confirm that the Steam Humidifier contains a 75 VA transformer .
Replace fan motor .
Check for obstructions or damage to fan .
Add a drip tee and trap (PN 4028) to the steam line as close to the Steam Humidifier as possible
to divert condensation to drain . See FIGURE 6 .