ABOVE EXPECTEDSNOW LINE

OUTDOORTEMPERATURE

SENSOR

NORTH, EASTOR WEST SIDE

OF HOME

24 VAC FURNACE ACCESSORY TERMINALS(10 VA MINIMUM) OR 24 VAC TRANSFORMER

(10 VA MINIMUM)

CONNECT DRAIN LINE HERE

YELLOW 24 VSOLENOID

VALVE WIRES

WATER SUPPLY

SHUT-OFF(SADDLE VALVE)

NOTEVERIFY THAT MODE SWITCHIS IN THE “BYPASS” POSITION.

NOTEDO NOT WIRE TRANSFORMERUSING FURNACE BLOWER CIRCUIT.

AUTOMATICHUMIDIFIER

CONTROL

24VR C

CHI

LO

H ODT

BYPA

SS

POW

ER

NOTECURRENT SENSING RELAYREQUIRED IF TRANSFORMERIS CONTANTLY POWERED.

CURRENTSENSING

RELAY(IF REQUIRED)

FURNACEBLOWER MOTOR

COMMONMOTOR

LEAD

FURNACEBLOWER MOTOR

HI

C

LO

CURRENTSENSING RELAY(IF REQUIRED)

YELLOW 24 VSOLENOID

VALVE WIRES

24 VAC FURNACEACCESSORY TERMINALS

OR TRANSFORMER(10 VA MINUMUM)

COMMON LEAD

MANUALHUMIDIFIER CONTROL

CONNECT DRAINLINE HERE

WATER SUPPLY

SHUT-OFF(SADDLE VALVE)

IMPORTANTUSE 120 VAC POWER SOURCE OTHERTHAN FURNACE MOTOR CIRCUIT.HOWEVER, THE TRANSFORMER CAN BEPOWERED OFF THE HOT 120 VAC LINEBEFORE IT ENTERS THE FURNACE.• DO NOT WIRE TRANSFORMER INTO

FURNACE BLOWER CIRCUIT.

IMPORTANTWHEN CURRENT SENSING RELAY IS USED:• WIRE CURRENT SENSING RELAY INTO 24 VAC HUMIDIFIER CONTROL

CIRCUIT ONLY! DO NOT INSTALL IN TRANSFORMER PRIMARY CIRCUIT.90-1434 90-1434

WARNING SPECIFICATIONSHUMIDIFIER DIMENSIONS

Width (including solenoid valve): 15 5⁄8”Height (including drain spud): 13”

Depth: 101⁄4”

BYPASS DUCT OPENING

6” diameter

PLENUM OPENING

9 1⁄2”W x 9 1⁄2”H

WATER FEED RATE

3 gph

ELECTRICAL DATA

24 VAC-60 Hz, 0.5 AMP

CAUTION

1. Water heating system can be damaged if watersupply remains off.

2. After humidifier installation is completed, turn hotwater supply back on.

3. Water heating system must be de-energized if themain water supply remains shut off.

4. Do not set humidity level above recommended or torecommended level if condensation exists on insidewindows of any unheated space, as condensationdamage may result. Excess humidity can causemoisture accumulation which can allow thepossibility for mold growth in your home.

5. Do not install humidifier in location where freezingtemperatures may occur. The water line could freezeand crack causing water damage to the home.

6. Do not install humidifier or bypass connectionon furnace cabinet.

7. Do not install humidifier or bypass connectionon blanked off end of cooling coil whereairflow will be restricted.

8. Do not connect the transformer to blowermotor wiring. Premature component failuremay result.

9. Do not install humidifier where waterpressures exceed 125 psi, since humidifierdamage may result. Follow codes in effectconcerning pressure reduction.

10. Do not install humidifier on systems withgreater than 0.4 in. wg pressure differentialbetween supply and return plenums.

RISK OF PROPERTY AND EQUIPMENT DAMAGE.

INSTALLATION INSTRUCTIONS AND TEMPLATE FOR HEALTHY CLIMATESMALL BYPASS HUMIDIFIER MODELS HCWB3-12, HCWB3-12K, HCWB3-12A & HCWB3-12AK

HUMIDIFIERHEALTHY CLIMATE® HUMIDIFIERS506365-01

4/2011 (Supersedes 7/2009)

TEMPLATE MUST BE LEVEL

1. ELECTRICAL SHOCK HAZARD.Can cause injury or death.Disconnect all electrical powersupplies before servicing.

2. RISK OF PROPERTY DAMAGE, INJURY ORDEATH. Installation, adjustments, alterations,service and maintenance must be performedby your Lennox dealer.

3. RISK OF SCALDING.Water temperature over125°F can cause severe burns and scaldinginstantly. Shut off the hot water supply beforedisconnecting or tapping into any hot watersupply line.

4. RISK OF SHARP EDGES HAZARD. Equipmentsharp edges can cause injuries. Avoid graspingequipment edges without protective gloves.

READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING

This product must be installed by a qualified heating and air conditioning contractor. Failure to do so could result in serious injury from electrical shock.This product must be installed in compliance with all local, state and federal codes.

ATTENTION INSTALLER:

The humidifier can be installed on either thesupply or return plenum of a forced air handlingsystem and is easily reversible for installation

with right hand or left hand bypass ductconnections. The humidifier dimensions and

serviceability must be considered when selectingthe best location for the humidifier. Here are2 examples of many types of installations.

RETURNAIR

SUPPLYAIR

COOLINGCOIL

Horizontal

Upflow

90-1452

INSTALLATION OPTIONS

FLUERETURNAIR

SUPPLYAIR

COOLINGCOIL

RECOMMENDED WIRING DIAGRAMS

Models HCWB3-12& HCWB3-12KMANUAL CONTROLFor detailed Manual Humidifier Controlinstallation and wiring instructions, seePublication No. 506407−01 includedwith Control.

Models HCWB3-12A & HCWB3-12AKAUTOMATIC HUMIDIFIER CONTROLFor detailed Automatic Humidifier Controlinstallation and wiring instructions, seePublication No. 504,879M includedwith Control.

TRACE ALONG OUTER EDGE

WARNINGCover on humidifier must be securely inplace when blower is operating. Gasfumes, which could contain carbonmonoxide, can be drawn into living spaceresulting in personal injury or death.

READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING

TEMPLATE MUST BE LEVEL

– TOP –READ REVERSE SIDE FIRST! READ REVERSE SIDE FIRST!

IMPORTANT! Be sure owner’s manual containing

instructions for operation and warranty information is given to

owner in order to avoid unnecessary calls.Warranty is void unless

humidifier is installed by qualified heating and air conditioning

contractor due to possible misapplication of product.

1. Remove front cover bypressing center tabs on top andbottom of the cover (1) and base(2). Pull feed tube (3) out of thewater distribution tray (4). Tip theevaporative assembly forwardand lift it out of the humidifier.(See Figure 1)2. The humidifier comesassembled for left sidedischarge. If converting to rightside discharge, the base can berotated so round collar is facingto the right. Swap the location ofthe hole plug (10) and drain spud(9) if using a right side discharge.To remove the cap, push andtwist from inside the housingwhile lifting the cap up slightly onthe outside. To remove the drainspud, twist and push from theoutside of the base.3. Using a level, position thistemplate at least 3 inches abovethe furnace housing or coolingcoil, if applicable, for clearanceof the drain line. Trace aroundtemplate edges. Remove thetemplate and accurately cut theplenum opening 91⁄2” x 91⁄2”,being careful to avoid injuryfrom sharp edges.4. Place the humidifier into theplenum opening, install six sheetmetal mounting screws (notfurnished) at the top and sides ofthe humidifier interior.5. Install a 6”collar in aconvenient location on theopposite plenum. Attach a 90°elbow and measure the length of6” round duct required to makethe connection. The design of thehumidifier collar provides a solidconnection with the bypass ductthrough the use of inside supportribs and pre-formed holes forsheet metal screws. Slip the ductinside the collar of the humidifier,up to the support ribs. Using thepre-formed holes at the top andbottom of the humidifier collar,secure the duct to the humidifiercollar with two sheet metalmounting screws (not furnished).Support bypass ducts longerthan 4 feet to prevent sagging.Seal duct seams and humidifierbase with foil tape or mastic.

6. Reinstall the evaporativeassembly back into the base,with the bottom of the scalecontrol insert (6) sitting firmlyin the inside of the drain spud(9). Snap into place. Ifevaporative assembly doesnot snap into place, reversethe assembly. Push the feedtube back into the waterdistribution tray. (See Figure 2)Put the front cover back on. Ifthe nameplate (11) is upsidedown, remove it and rotate thenameplate so it is right sideup, and snap back into place.Turn damper handle (8) to theopen position “WINTER” forthe heating season, or closedposition “SUMMER” for thecooling season.7. Locate and install the ManualHumidifier Control by followingthe instructions shown in step#7A. For Automatic HumidifierControl installation instructions,see Publication No. 504,879Mincluded with the AutomaticControl. DISCONNECTELECTRICAL POWER TOFURNACE BEFOREPROCEEDING!

LOCATION1. Locate on inside wall of livingarea approximately 5 feet abovefloor, or in the furnace return airplenum. If humidifier is mountedon return duct, HumidifierControl must be at least 6”upstream of humidifier.

2. Do not locate Control in thedirect path of furnacedischarge air or drafts fromopen doors and windows.

3. Do not install where operationmight be affected by lamps,sunlight, fireplace registers,radiators, concealed air ductsand pipes, or next to activitiesthat generate moisture.

4. The basic rules for location ofthermostats also apply tohumidifier controls.

8. The humidifier solenoid valve andHumidifier Control operate on 24 VAC.In order for the humidifier to turn on,the furnace blower must be operatingand the Humidifier Control must becalling for humidity. See HumidifierControl manuals for Control wiring.Do not wire transformer into furnaceblower circuit. The transformer can bepowered from the 120 VAC line before itenters the furnace.9. Tap into a water supply line with thesaddle valve furnished. See instructionson saddle valve package. Thehumidifier will function with cold, hot,softened or unsoftened water.WARNING: RISK OF SCALDING. Watertemperature over 125°F can causesevere burns and scalding instantly.Shut off the hot water supply beforedisconnecting or tapping into any hotwater supply line. The use of servicehot water (140°F MAX.) and constantblower operation will provide maximumevaporative capacity.When installinghumidifier on heat pump system,humidifier must be supplied withservice hot water. When installinghumidifier on return plenum, it isrecommended that the humidifier issupplied with hot water.NOTE: The saddle valve is designed tobe fully opened or closed. Do not use itto regulate water flow.10. Connect tubing from the saddlevalve to the inlet side of the solenoidvalve using 1⁄4” O.D. copper tubing (notfurnished). DOUBLE WRENCH ASSHOWN IN FIGURE 3 TO PREVENTDAMAGE TO VALVE BRACKET ANDENSURE WATERTIGHT CONNECTION.

NOTE: BEFORE LEAVING THEJOB SITE, MAKE SURE:

1. Saddle valve is fully open.

2. There are no plumbing leaks.

3. Humidifier functions properly.

4. Bypass damper is in properposition.

Figure 1 Figure 2 Figure 3

10009369 B2205450A 4.11

GENERAL INSTRUCTIONS1. Do not attempt to repair orrecalibrate Humidifier Control.Humidifier Controls requiringservice should be returned toyour Lennox dealer.

2. Use humidifier control in lowvoltage (24 VAC) applicationsonly. Install 24 VAC wiring tohumidifier control as shown inWiring Diagrams, opposite side.

3. Make sure no bare wires areexposed or insulation damaged.Insulation on wire should extendto head of binding screws.

4. Make sure all splices aremechanically and electricallysecure.

5. To remove dirt or other foreignmatter from nylon ribbon andcontrol interior, dust lightly witha fine, soft brush.

90-1067 90-1068 90-1069

8

5

3

4

111

6

9

7

2

10

12

13

14

1590-1435

FURNISHED ITEMS

ITEMS NOT FURNISHED

Built-in bypass damper24 VAC Humidifier Control

24 VAC TransformerSaddle valve

Humidifier Installation TemplateHumidifier Control manuals

Mounting screws (sheet metal screws)Water supply line (1⁄4” copper)

Drain line (1⁄2” I.D. hose)18 gauge low voltage wire

6” bypass ductworkCurrent Sensing Relay (if required)

Hose clamp

11. Drain spud is designed to accept1⁄2” I.D. plastic hose (not furnished). Rundrain line from drain spud to floor drainor alternate drain location. CAUTION: Ifhose clamp is used, do not over tighten,drain spud could crack. Be sure drainline has continuous slope. NOTE: Donot sweat or directly attach metal drainline to fitting. Do not use solvent typeadhesive when connecting plasticdrain line, since damage to fitting couldresult.12. Open saddle valve completely andcheck for leaks. Turn on blower system.HCWB3-12 & HCWB3-12K – Adjusthumidifier setting so that humidifierwill turn on. Allow humidifier to rununtil water is observed coming out ofdrain line. Check to see if humidifierand saddle valve are watertight. Checkoperation to make sure that allelectrical components functionproperly. Set Control to recommendedlevel. (See operating instructions inowners manual.)HCWB3-12A & HCWB3-12AK – Usehumidification “System Checkout”section of Automatic Humidifier ControlInstallation Instructions, PublicationNo. 504,879M. Check to see ifhumidifier and saddle valve arewatertight. Check operation to makesure that all electrical componentsfunction properly.

1. Front Cover2. Base3. Feed Tube4. Water Distribution Tray5. Humidifier Pad6. Scale Control Insert7. Integral Damper8. Damper Handle9. Drain Spud10. Hole Plug11. Nameplate12. Solenoid Valve13. Strainer14. Orifice15. Transformer

TRACE ALONG OUTER EDGE

TRACE ALONG OUTER EDGE

7A. MANUAL HUMIDIFIER CONTROL INSTALLATION INSTRUCTIONSFOR HCWB3-12 & HCWB3-12K: The enclosed Manual Humidifier Controlis designed for low voltage service to control humidification equipment.An increase in relative humidity expands the nylon ribbon which opensthe control switch to stop operation on the humidifier. A decrease inrelative humidity reverses the process and closes the control switch.(For detailed Manual Humidifier Control installation and wiringinstructions, see Publication No. 506407−01 included with Control.)