L4064B Universal Combination Fan and Limit Controllers

1 SUPER TRADELINE L4064 BUniversal Combination Fan and Limit ControllersAPPLICATION The L4064B controls the on and off operation of theheating unit s fan motor and provides high Limit controlof the main burner. It is suitable for all types of forcedair heating systems. The L4064B s bimetal sensing element turns fan onand off according to plenum temperature. The L4064B has a manual switch to providecontinuous fan operation, mounting adapters forreplacing competitive devices, adapters for wiringconvenience, and a strain relief bushing for protectingthe wiring from damage due to field abuse. Limit contacts are suitable for line voltage, lowvoltage or millivoltage fan-on timing can vary depending on appliedvoltage and switch installing this 1. Read these instructions carefully. Failure tofollow them could damage the product or cause ahazardous condition. 2. Check the ratings given in the instructions andon the product to make sure the product is suitablefor your application.

2 3. Installer must be a trained, experienced servicetechnician. 4. After installation is complete, check out productoperation as provided in these instructions. Failure to remove brass jumper, if Limit switch isin low voltage circuit, can cause electrical shockhazard or damage low voltage controls. 1. Disconnect power supply before connectingwiring to prevent electrical shock or equipmentdamage. 2. When connecting cable or conduit to control,avoid straining the control case. Follow furnace or burner manufacturer sinstructions, if available. The L4064B has amaximum switch temperature of 190OF (88OC),maximum element temperature of 350OF (177OC).Do not exceed these temperatures or the followingelectrical ratings (amperes):Pilot Duty: 2 A at 24 Vac; A at to 12 Combined Connected Load: 2000 (167OF) (min.) field wiring required. Wiring mustconform to NEC Class 1 requirements.!WARNING!CAUTION120 Vac240 VacFANLIMITLIMITFAN1484848744254 Full LoadLocked RotorAutomation and Control SolutionsHoneywell International Douglas Drive NorthGolden Valley, MN, RB Honeywell 2006 Printed in Canada69-0117-3 Fig.

3 9 - A: Limit in low voltage circuit. B: Limit in line voltage circuit. C: Limit in line voltage circuit without fan contacts (at the FAN ON temperature setting).During normal operation, the call for heat end beforethe Limit setting is reached, and the fan contacts breakas the plenum temperature falls and the FAN OFFsetting is reached. If the call for heat continues until the temperature inthe plenum rises to the Limit setting, the bimetalelement will mechanically break the Limit contacts andde-energize the gas control When installation is complete, disconnect the fanmotor circuit at the L4064. Turn on power and setthermostat to call for heat. Burner should come on andlimit controller should shut burner off when plenumtemperature reaches the Limit set point. Turn off power,recconnect the fan switch, turn on power and again setthermostat to call for heat. Fan should come on whenplenum temperature has reached fan-on 10 - Changing the high Limit AND ADJUSTMENTSFAN SETTING ADJUSTMENT 1.

4 Move the FAN OFF lever to the temperature atwhich the fan is to stop to prevent circulation of coolair. 2. L4064B - Move the FAN ON lever to thetemperature at which the fan is to come FAN SWITCH For constant fan operation, push the FAN switchbutton in. For fan to cycle automatically, pull SETTING ADJUSTMENT These Controllers have a Limit stop which preventsthe Limit indicator lever from being adjusted beyondthe equipment manufacturer s specifications. 1. Push the small end of Limit Adjust Tool(196722) through hole in scaleplate (located atcaution marking) to depress the stop disc not morethan 1/16 in. ( mm) to release stop lock (Fig. 10).Stop disc is on back of scaleplate. 2. While depressing the stop disc, insert the longend of Limit Adjust Tool next to Limit stop (Fig. 10)and move the stop to desired setting. If the L4064 isa replacement control, high Limit stop setting shouldbe the same as that of the control being replaced.

5 (Move stop clockwise to lower the setting,counterclockwise to raise it.) Then remove thelimit stop adjust tool. 3. Set the Limit OFF lever to the temperature atwhich the high Limit switch is to open to stop theburner. If the high Limit stop has been properly set,the Limit OFF lever should be as high as the As the plenum temperature rises, the bimetal sensingelement of the control wraps and mechanically makes When adjusting the fan and Limit set point levers(Fig. 10), hold the scalepale dial to keep it from turningand straining the sensing each indicator lever to the control pointrecommended by the burner or furnace gentle finger SIDEFAN SIDELIMIT SIDELIMIT SIDEJUMPER REMOVEDJUMPER IN PLACEPOWER SUPPLYPOWER SUPPLYFAN MOTORFAN MOTOR1221133L1L1L2L2 ADD DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIREDTO CONTROL LOW VOLTAGE EQUIPMENTTO CONTROL LINE VOLTAGE FAN MOTORFAN SIDELIMIT SIDEL1L2 POWER SUPPLY1(HOT)(HOT)(HOT)120 VJUMPER REMOVEDL406424V2 HEATING SYSTEM TRANSFORMER11,221 PRODUCT DATA!

6 CAUTIONLOCATION If this is a replacement installation, locate theL4064 in the same location as the control beingreplaced. Sensing tube length should be same asold control. If this is a new installation, the elementshould be installed only by a trained, experiencedservice technician according to the furnacemanufacturer s instructions. The element must nottouch any internal part of the furnace. The electrical rating is at maximum switchtemperature of 190OF (88OC). If plenum surfacetemperature exceeds 190OF (88OC), heatinsulating material or a mounting bracket must The device may be mounted either on theplenum surface or with a bracket (rigid or swivel).SURFACE MOUNTING Hole in plenum should be just large enough toaccommodate the 3/4 in. ( mm) diameterelement tube, Fig. 1. For adequate clearance, a13/16 in. ( mm) diameter hole isreccomended. 1. Remove cover by squeezing sides andpulling off. Insert element in plenum and marklocation of mounting holes.

7 Make sure the case issnug against the plenum before marking themounting screws. 2. Punch or drill holes for mounting screws. 3. Place insulation between plenum and case ifnecessary. 4. Fasten controller securely with 1 - Surface mounting requires a hole 13/16in. ( mm) diameter for element :50100150200250 ONFAN OFFFAN OFFDO NOT ROTATE - HOLD DIAL WHEN SETTING POINTERSCAUTION11 HOMEOWNER: THIS IS A "SAFETY STOP". DO NOT ALTER2704 EFAN OFF SET POINT LEVERFAN ON SET POINT LEVERSCALEPLATETO RELEASE STOP, PRESS STIFF WIRE IN HOLEADJUSTABLE Limit STOPLIMIT SET POINT LEVER (FACTORY-SET AT 200OF (93OC) Limit STOP TOOLADD HEAT INSULATING MATERIAL IF NEEDEDFURNACE PLENUM11,219 Fig. 5 - Removing slotted 7 - Closing the strain relief 6 - Insert strain relief bushing. 3. Refer to the following section for type of wiringconnections (standard wire push-in terminals or femalereceptacle).WIRING CONNECTIONS When connecting cable or conduit to this controller,use care to avoid strain on the control can be made to standard wire push-interminals or female receptacles for 1/4 in.)

8 ( mm)male flag connectors on both the fan and limitswitches (Fig. 8).FOR STANDARD WIRE PUSH-IN TERMINALS Connect wires to the terminals as follows: 1. Use Nos. 14,16, or 18 solid wire or Nos. 14 or 16stranded wire, depending on electrical requirement. 2. Strip insulation from wires the distance shown bythe strip gauge on the controller. 3. Solid wire may be inserted directly into theterminal holes. If stranded wire is used, insert a smallscrewdriver into the slot next to the terminal. Pushscrewdriver in and hold while inserting wire intoterminal (Fig. 8). Remove screwdriver. If stranded wireis solder-dipped, it can be pushed directly intoterminal FEMALE RECEPTACLES - It is recommended that the female receptacles beused for wiring accessory equipment; ,electronic air cleaner, humidifier, etc. Connect wires to the receptacles as follows: 1. Use Nos. 14 to 18 size wire, depending onelectrical requirement.

9 2. Attach 1/4 in. ( mm) male flag connector toeach wire. Two male connectors with leadwires aresupplied. 3. Push male flag connector directly into thefemale receptacle. Make sure that the flag is forcedto the bottom of cavity and wire is in the channel(Fig. 8).IMPORTANTMake certain all wires are clear of rotating 8 - Location of wiring 3 - Rigid bracket mounting requires a hole 13/16 in. ( mm) diameter for element 4 - Using SUPER TRADELINE Disconnect power supply before beginninginstallation to prevent electrical shock or equipmentdamage. All wiring must comply with local electrical codes andordinances or in the absence of local codes with theNational electrical Code ANSI C1-1981-NFPA burner or furnace manufacturer s instructions ifavailable; otherwise, see Fig. 10 and proceed The slotted knockouts on the bottom of the case andthe strain relief bushing are provided to simplify theinstallation procedure and to protect the wires.

10 1. To remove the slotted knockout(s), use aneedlenose pliers as shown in Fig. 5 and pull straightdown. 2. If cable is used, we recommend using a strain reliefbushing in the knockout (Fig. 6). Pass the wires throughbushing before MOUNTING L4064 may also be swivel-mounted. The swivelbracket requires a 1-9/16 in. ( mm) hole in theplenum (Fig. 2). 1. Use bracket as a template to mark the locationof mounting holes in plenum. Drill or punch holesfor mounting screws. 2. Fasten the brackets in place with furnishedscrews. Start the screws but do not tighten. 3. Insert element tube through bracket, straightencontroller, and fasten. Tighten the mounting screwssecurely. It may be necessary to rotate the bracketto tighten all screws 2 - Swivel mounting requires a 1-9/16 in. ( ) diameter mounting hole for element brass jumper is the breakaway type. It must beremoved when the Limit is used in the low voltagecircuit.