Aprilaire 448 Guide de dépannage

PremiumDigital Humidifier ControlSafety and Installation InstructionsWARNINGATTENTION INSTALLER: This product must beinstalled by a qualified heating

1918OUTDOOR TEMPERATURESENSOR OR MANUALMODE RESISTORRCAB ODT CfW/GDIGITAL HUMIDIFIER CONTROL TERMINAL STRIPH24 VACTRANSFORMERFURNACEBLOWERMODEL 50COMM

21201. Replace the cover by snapping it into the Humidifier Controlbase. Also replace the knob onto the Control.2. Restore power to the heating system

2322TROUBLESHOOTINGApplies to both Automatic and Manual Operation unlessindicated otherwise.TABLE 1Outdoor Temperature (°F) Resistance (kΩ) ±10-30 231

2524SYMPTOMHumidifier does not operate in “Test/Reset” modeTROUBLESHOOTING PROCEDURE• Make sure that the blower is operating and the HVACsystem is cal

2726SYMPTOMHumidifier operates only in “Test/Reset” mode• If outdoor temperature is greater than 60°F or less than-30°F, the Humidifier Control will o

28RESEARCH PRODUCTS CORPORATIONP.O. BOX 1467 • MADISON,WI 53701-1467Call 800/334-6011 • FAX 608/257-435710008419 1.09B2204686BSYMPTOMHumidifier or Hum

32Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 3System Checkout . . . . . . . . . . . . . . . . . .

54STEP 2: Disassemble the Humidifier ControlRemove the knob. Remove the cover by pulling at the bottom andswinging it out and upward.STEP 3: Check the

76STEP 5: Determine Location for Humidifier Controland Mount ControlHumidifier Control must be mounted on the Return Duct, at least6 inches upstream o

98Figure D – Fiber Board Duct Mount90-1203CONTROL BOARDCOVERKNOBBASE PLATERETURN DUCTRETURNDUCTSHEET METALPLATECUT OPENING INRETURN DUCTSHEET METAL PL

1110STEP 8: Alternate Location for OutdoorTemperature SensorThe Sensor can also be mounted in the center of either:• PVC fresh air intake pipe for the

1312Installing the Humidifier Control forManual OperationIf it is not feasible to install the OutdoorTemperature Sensor, the Humidifier Control can be

FURNACE ACCESSORYTERMINALSTERMINALS MAY BE LABELED:“HUM”, “ACC” OR “EAC”24 VAC TRANSFORMERHDIGITAL HUMIDIFIER CONTROL TERMINAL STRIPW/G CfODTBACR“HUM”

1716NOTE:18 AWG WIRE ISACCEPTABLE FOR 24VINSTALLATIONS.WHITE/BLUEWHITE/YELLOWYELLOW(C)ORANGE(NO)BLUE(NC)REMOVE WIRE“G” TO “G”4851 RELAYAPRILAIREOUTDOO