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Aprilaire 220 Service Manual

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SERVICE MANUAL
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HUMIDIFIER

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  Summary of Contents for Aprilaire 220

  • Page 1 SERVICE MANUAL HUMIDIFIER...
  • Page 2: Table Of Contents

    I I N N D D I I V V I I D D U U A A L L U U N N I I T T S S E E R R V V I I C C E E Models 220-224-400*-440-550-550A*-558*-560-560A*-568*-600*…6 Models 760,760A* & 700* (formerly model 768*) ……………………13 Models 445,445A* & 448* ……………………………………………16 Model 350, 360 …………………………………………………………19 Models 110 & 112………………………………………………………22 *Units featuring the Aprilaire Humidifier Control ©Research Products Corporation 2006...
  • Page 3: Lack Of Humidity

    1. Sudden operation may cause personal injury or property damage on Models 220, 22x4, 440, 550A, 550, 560A and 560 humidifiers. Turn Auto-Trac™ Control 220, 224, 400, 440, 550, 550A, 558, 560, 560A, 568 and 600 humidifiers. Turn System of manual humidistat to “Off” or lowest setting before servicing or the Humidifier Control or manual humidistat to “Off”...
  • Page 4 4,200 3,000 *Based on 8' ceiling height. Models 220, 224, 400, 440, 445, 445A, 448, 550, 550A, 558, 560, 560A, 568 and 600 Total Static Pressure Drop Across Supply & Return Plenum ………………………………0.2" (1) Calculations are based on: (2) Calculations are based on: a.
  • Page 5: Excess Humidity

    A drain safety overflow has been molded into the lower housing of all the black plastic Aprilaire units. This safety overflow is designed to eliminate water inside of the furnace plenum if there is a malfunction. Removing dips and hills from the drain line and flushing it with water under pressure will eliminate the problem.
  • Page 6 The design feed rate is 3 gph for the Models 110, 220, 550, 550A, 558, 560, 560A, 568 and 600. This feed rate will fill a quart jar in 5 minutes. The design feed rate for the Models 112, 224, 330, 350, 360, 440, 760, 760A, 768 and 700 is 6 gph.
  • Page 7: Models 220-224-400*-440-550-550A*-558*-560-560A*-568*-600

    INDIVIDUAL UNIT SERVICE—MODELS 220-224-400-440-550-550A-558-560-560A-568-600 CAUTION: 1. Sudden operation may cause personal injury or property damage. Turn the Automatic Humidifier Control or manual humidistat to "Off" or lowest setting before servicing or troubleshooting these units. I. LACK OF HUMIDITY ● Check The Home — See Pages 2 and 3.
  • Page 8 III. LEAKING WATER — See Page 4. The Models 220 and 224 are provided with a cover over the distribution tray. These covers are quite effective in minimizing water bubbling out of the feed tray up to approximately 0.4 in. static pressure. A damper should be included in the bypass between the supply and return plenum to relieve the pressure that can be created by zone dampers completely closed with the furnace blower still operating.
  • Page 9 EXPLODED RP APRILAIRE PLENUM HUMIDIFIER (MODELS 220 & 224) Instructions for Ordering Parts Specify: MODEL NO. — PART NAME — PART NO. - 8 -...
  • Page 10 EXPLODED RP APRILAIRE PLENUM HUMIDIFIER (MODEL 440) Instructions for Ordering Parts Specify: MODEL NO. — PART NAME — PART NO. - 9 -...
  • Page 11 EXPLODED RP APRILAIRE PLENUM HUMIDIFIER (MODELS 550, 550A, 558 / 560, 560A, 568) 15A or 15B Instructions for Ordering Parts Specify: MODEL NO. — PART NAME — PART NO. - 10 -...
  • Page 12 EXPLODED RP APRILAIRE PLENUM HUMIDIFIER (MODEL 400) Instructions for Ordering Parts Specify: MODEL NO. — PART NAME — PART NO. - 11 -...
  • Page 13 EXPLODED RP APRILAIRE PLENUM HUMIDIFIER (MODEL 600) Instructions for Ordering Parts Specify: MODEL NO. — PART NAME — PART NO. - 12 -...
  • Page 14 The fan blade should be tight on the shaft and 1/3 through the orifice plate toward the motorboard. If not, reposition the fan and tighten set screw to flat on the motor shaft. Aprilaire Humidifier Control Manual Humidistat APRILAIRE HUMIDIFIER...
  • Page 15 The motor will operate if power is connected to the unit, the furnace blower is running and the humidistat switch is closed. To check the fan motor: APRILAIRE HUMIDIFIER CONTROL- AUTOMATIC AND MANUAL MODE 1. Replace the cover assembly and reconnect power.
  • Page 16 EXPLODED RP APRILAIRE PLENUM HUMIDIFIER (MODELS 760 760A 768 & 700) or 1B Instructions for Ordering Parts Specify: MODEL NO. — PART NAME — PART NO. - 15 -...
  • Page 17 INDIVIDUAL UNIT SERVICE—MODELS 445, 445A & 448 WARNING: 1. 120 VOLTS may cause serious injury from electrical shock. Disconnect power and shut off water supply before servicing or troubleshooting this unit. 2. Rotating or electrical components may cause serious injury from con- tact.
  • Page 18 The Model 445, 445A and 448 are circulating units which will require maintenance every 30 days. Complete servicing instructions for both the water reser- voir and circulating pump are located in the homeowners manual. Aprilaire Humidifier Control Manual Humidistat NOTE...
  • Page 19 EXPLODED RP APRILAIRE PLENUM HUMIDIFIER (MODELS 445, 445A & 448) 20A or 20B Instructions for Ordering Parts Specify: MODEL NO. — PART NAME — PART NO. - 18 -...
  • Page 20: Model 350, 360

    INDIVIDUAL UNIT SERVICE—MODELS 350 & 360 WARNING: 1. 120 VOLTS may cause serious injury from electrical shock. Disconnect power and shut off water supply before servicing or troubleshooting these units. 2. Rotating or electrical components may cause serious injury from con- tact.
  • Page 21 EXPLODED RP APRILAIRE PLENUM HUMIDIFIER (MODEL 350) Instructions for Ordering Parts Specify: MODEL NO. — PART NAME — PART NO. - 20 -...
  • Page 22 EXPLODED RP APRILAIRE PLENUM HUMIDIFIER (MODEL 360) Instructions for Ordering Parts Specify: MODEL NO. — PART NAME — PART NO. - 21 -...
  • Page 23: Models 110 & 112

    If either the motor or solenoid valve is not operating and the other is operating, the relay trans- former and humidistat can be eliminated as a source of trouble. Disconnect electrical power and replace the motor or solenoid valve whichever is not working. APRILAIRE HUMIDIFIER GREEN GROUND...
  • Page 24 SORY TERMINALS THAT CAN BE USED FOR THE HUMIDIFIER. THE RP MODEL 50 RELAY MAY NOT BE NECESSARY IN THIS CASE. CONSULT THE FURNACE MANFACTURER'S RECOMMENDATIONS FOR WIRING. HUMIDISTAT CURRENT SENSING RELAY 110 & 112 APRILAIRE HUMIDIFIER BLACK BRACKET COMMON YELLOW LEAD WATER BLACK...
  • Page 25 EXPLODED RP APRILAIRE PLENUM HUMIDIFIER (MODELS 110 & 112) Instructions for Ordering Parts Specify: MODEL NO. — PART NAME — PART NO. -24 -...
  • Page 26 ® P.O. BOX 1467 • MADISON, WI 53701-1467 Call toll-free 1-800-334-6011 • FAX 608/257-4357 FORM NO. 1780 01.06 Printed in U.S.A.