Maintenance; Troubleshooting Guide - Aprilaire 850 Installation & Maintenance Instructions Manual

MAINTENANCE

After replacing the Model 80 Steam Humidifier Canister:
• Ensure fan is operating during a call for humidification .
• Check drain, steam and condensate hoses for kinks, blockages, leaks or cracks . Replace if necessary .
• Ensure steam outlet of the fan pack is not blocked .

TROUBLESHOOTING GUIDE

If a problem arises with the Aprilaire Fan Pack, please review the following troubleshooting guide for possible causes and solutions . If the
problem persists, call Aprilaire Tech Support toll-free at 1-800-334-6011 . Please be prepared to describe the exact nature of the problem .
TABLE 1 – Troubleshooting Guide
Problem Possible cause
Water dripping from Tubing connection
Fan Pack
Fan not operating
Steam outlets blocked
Foaming in canister or
steam hose
Air drafts in the space
Fan does not operate Wiring
Steam Humidifier power
No humidity call
Circuit board output
Motor failure
Noise Fan noise
Gurgling
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 Steam Humidifier is powered and on .
Adjust humidistat setting . Check location of humidistat .
Confirm 24 VAC output from 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 5 .
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