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Failure to do so could result in personal injury or property damage. Fan switch must be installed by a qualified person in accordance with the National Electrical Code, NFPA 70. This fan switch kit can be used on all 208, 240 and 277 Volt LUH/KUH heaters with single or 3 phase motors for fan only operation. See Model Number list on page 2. For all 480 Volt LUH/KUH heaters, the summer fan switch and relay option must be used (see PF481). INSTALLATION The kit comes complete with all necessary wiring and mounting screws. A wall box plate is included for remote mounting of the selector switch and can be discarded if the switch is to be mounted on the heater. To install on the heater, open the wiring access door located on the bottom of the heater by turning the captive latching screw 90 degrees in either direction (see Figure 1). The selector switch is to be mounted using the knockout hole on the front of the heater, located right above the Chromalox or Heatflo Label (see Figure 2). The switch has all of the wiring already connected to the correct terminals and the three leads to be wired to other components marked by their respective terminal number, these are wire numbers 1, 3 and 9. Before installing the switch, check all the wiring connections to be sure none have gotten loose during shipping and handling. Mount the switch with the toggle through the hole from inside the wiring compartment. Secure the switch using the on/off plate and hex nut (see Figure 3). Captive Latching Screw Summer Fan Switch Knockout Hole Summer Fan Switch Mounting Figure 1 Figure 2 Figure 3 © 2010 Chromalox, Inc. WIRING The basic stock heater wiring diagram (Figure 4) will be changed ADDITIONAL STEPS FOR HEATERS WITH to the finished diagram (Figure 5). THREE (3) PHASE MOTORS 1. Remove the motor lead wires from the heater contactor terminals 6. Connect black wire (number 9) to contactor terminal marked L2. marked T1, T2 and T3. (Note that single phase motors will have 7. Connect black wire (number 7) to contactor terminal marked T2. only two lead wires.) 8. Connect third motor lead wire to terminal 8 on the switch. After 2. Connect the black wire (Number 1) from the switch to the T3 ter-completion of the heater installation, when the fan circuit is first minal on the heater contactor. turned on, check the rotation of the fan to be sure air is moving 3. Connect black wire (Number 3) to contactor terminal marked L3. from the back of the heater to the front. If the air is moving in the 4. Connect one of the motor leads to terminal 2 on the switch. opposite direction, interchange any two motor lead connections to 5. Connect the second motor lead to connector terminal marked L1. correct the air flow direction. X1X2H2H1C1Motor1O or 3OL3L2L1T1T2T33O Wiring OnlyPower60HzCutoutXFMROptional ThermostatBuilt-in or Field InstalledTo Element Wiring3 Phase DeltaC1T1T2T3L1L2L3C1T1T2T3L1L31 Phase 2 or 3 ElementOptional Disconnect SwitchBuilt-in or Field InstalledBuilt-in or Field InstalledFactory WiringTransformer Color Code IndexPri. VoltPri. LeadXFMRClrs. 120VLeadSec. Clrs. 24VLeadSec. Clrs. 208240277480H1H2X1X2X1X2WHTWHTWHTWHTBLKREDREDREDREDREDREDREDREDREDYELYELYELYELYELYELYELYELYELBLU X1X2Motor1O or 3OL3L2L13O Wiring OnlyPower60HzCutoutXFMROptional ThermostatBuilt-in or Field InstalledTo Element Wiring3 Phase DeltaC1T1T2T3L1L2L3C1T1T2T3L1L31 Phase 2 or 3 ElementOptional Disconnect SwitchBuilt-in or Field InstalledBuilt-in or Field InstalledFactory WiringTransformer Color Code IndexPri. VoltPri. LeadXFMRClrs. 120VLeadSec. Clrs. 24VLeadSec. Clrs. 208240277H1H2X1X2X1X2WHTWHTWHTBLKREDREDREDREDREDREDREDYELYELYELYELYELYELYELC1T1T2T3Motor1O or 3OStandard Motor ConnectionC1T1T2T3H1H23O Wiring Only132798101211Optional SummerFan Switch Built-inor Field Installed Figure 4 Figure 5 ISFS-02 Kit vs. Applicable Heater Model Number MODEL MODEL LUH-D-02-81-34-00 LUH-D-02-21-34-00 LUH-D-02-71-35-00 LUH-D-04-81-34-00 LUH-D-04-83-34-00 LUH-D-04-21-34-00 LUH-D-04-23-34-00 LUH-D-04-71-35-00 LUH-D-05-81-34-00 LUH-D-05-83-34-00 LUH-D-05-21-34-00 LUH-D-05-23-34-00 LUH-D-05-71-35-00 LUH-D-07-81-34-00 LUH-D-07-83-34-00 LUH-D-07-21-34-00 LUH-D-07-23-34-00 LUH-D-07-71-35-00 LUH-D-10-81-34-00 LUH-D-10-83-34-00 LUH-D-10-21-34-00 LUH-D-10-23-34-00 LUH-D-12-83-34-00 LUH-D-12-23-34-00 LUH-D-15-83-34-00 LUH-D-15-23-34-00 LUH-D-20-23-34-00 LUH-D-30-83-34-00 LUH-D-30-23-34-00 LUH-D-35-23-34-00 LUH-D-40-23-34-00 MODEL MODEL KUH-C-02-81-00 KUH-C-02-21-00 KUH-C-02-71-00 KUH-C-04-81-00 KUH-C-04-83-34 KUH-C-04-21-00 KUH-C-04-23-34 KUH-C-04-71-00 KUH-C-05-81-00 KUH-C-05-83-34 KUH-C-05-21-00 KUH-C-05-23-34 KUH-C-05-71-00 KUH-C-07-81-34 KUH-C-07-83-34 KUH-C-07-21-34 KUH-C-07-23-34 KUH-C-07-71-30 KUH-C-10-81-34 KUH-C-10-83-34 KUH-C-10-21-34 KUH-C-10-23-34 KUH-C-12-83-34 KUH-C-12-23-34 KUH-C-15-83-34 KUH-C-15-23-34 KUH-C-20-23-34 KUH-C-30-83-34 KUH-C-30-23-34 KUH-C-35-23-34 KUH-C-40-23-34 Limited Warranty: Please refer to the Chromalox limited warranty applicable to this product at http://www...