Specified Controls SC-LLC-200 Installation Instructions Manual

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The SC-LLC-200 from Specified Controls is a versatile, 24VAC powered lead/lag controller offering

true dual stage control to balance the operating run time between HVAC equipment as well as other redundant devices. The controller has dedicated terminals for 24VAC power, 2 inputs and 2 outputs. LEDs provide visual indication for power and output status. SEQUENCE OF OPERATION When 24 Volt power is first applied to the 24VAC terminals 7and 8 on the SC-LLC-200, Unit 1 and Unit 2 output contacts remain open. When 24 Volts is applied to input terminal 1, Unit 1 output contacts go closed and Unit 2 contacts remain open. When 24 Volts is removed from terminal 1 for at least 10 seconds, Unit 1 output contacts open. When 24 Volts is reapplied to terminal 1, Unit 1 output contacts remain open and Unit 2 output contacts go closed. The lead/lag sequence is reversed every time 24 Volts is removed from terminal 1 for more than 10 seconds and then reapplied. In a dual stage application, 24 Volts applied to terminal 2 will close the lag output contacts. As long as 24 Volts is maintained on terminal 1, the lag output can be cycled on and off. The SC-LLC-200 Lead/Lag Controller must be powered from the same 24 Volts as Unit 1 control circuit or a relay will be required. WIRING DIAGRAMS The wiring diagrams illustrated in this installation manual represent a sampling of the many ways the SC-LLC-200 can be applied for lead/lag control. The SC-LLC-200 is an operating controller only and depending on the application, it is the responsibility of the installer to verify that the SC-LLC-200 complies with all electrical and/or plumbing codes. SPECIFICATIONS Input: 24 VAC Frequency: 60/60 Hz Contact Rating: 12 Amps @ 24 VAC PC Board Dimensions: 3.25” W x 5.5” H Mounted on Snap-Track Controller With SC-LLC-200-ME with metal enclosure Optional Enclosures: SC-LLC-200-WPE with weather-proof plastic enclosure 5351 East Thompson Road, Suite 128, Indianapolis, IN 46237 Phone 888.359.0365 www.specifiedcontrols.com 06-1072-083011

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SC-LLC-200 LEAD/LAG CONTROL Signal 1 IN Signal 2 IN Unit 1 Unit 1 Unit 2 Unit 2 24V R 24V C Y1 G R X Y1 G R X HVAC UNIT 1 HVAC UNIT 2 WIRING DIAGRAM USING SC-LLC-200 LEAD/LAG CONTROLLER WITH SINGLE-STAGE COOLING UNITS IN PARALLEL 5351 East Thompson Road, Suite 128, Indianapolis, IN 46237 Phone 888.359.0365 www.specifiedcontrols.com SINGLE-STAGE STAT

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SC-LLC-200 LEAD/LAG CONTROL Signal 1 IN Signal 2 IN Unit 1 Unit 1 Unit 2 Unit 2 24V R 24V C Y1 G R X Y1 G R X HVAC UNIT 1 HVAC UNIT 2 WIRING DIAGRAM USING SC-LLC-200 LEAD/LAG CONTROLLER WITH SINGLE-STAGE COOLING UNITS IN PARALLEL WITH UPSTAGING 5351 East Thompson Road, Suite 128, Indianapolis, IN 46237 Phone 888.359.0365 www.specifiedcontrols.com MULTI-STAGE STAT

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SC-LLC-200 LEAD/LAG CONTROL Signal 1 IN Signal 2 IN Unit 1 Unit 1 Unit 2 Unit 2 24V R 24V C 5351 East Thompson Road, Suite 128, Indianapolis, IN 46237 Phone 888.359.0365 www.specifiedcontrols.com WIRING DIAGRAM USING SC-LLC-200 LEAD/LAG CONTROLLER FOR 2 PUMP SYSTEM WITH A FLOW SWITCH TO TRIGGER LEAD/LAG FLOW SWITCH PUMP 1 PUMP 2 24V LINE NC C NO 24 V COIL RY-1 NC C NO 24 V COIL RY-1 TRANSFORMER PUMP 1 RELAY PUMP 2 RELAY PUMP CONTROLLER 120V / 240V POWER 120V / 240V POWER

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SC-LLC-200 LEAD/LAG CONTROL Signal 1 IN Signal 2 IN Unit 1 Unit 1 Unit 2 Unit 2 24V R 24V C 5351 East Thompson Road, Suite 128, Indianapolis, IN 46237 Phone 888.359.0365 www.specifiedcontrols.com WIRING DIAGRAM USING SC-LLC-200 LEAD/LAG CONTROLLER FOR 2 PUMP SYSTEM WITH A RELAY TO TRIGGER LEAD/LAG PUMP 1 PUMP 2 24V LINE NC C NO 24 V COIL RY-1 NC C NO 24 V COIL RY-1 TRANSFORMER PUMP 1 RELAY PUMP 2 RELAY PUMP CONTROLLER 120V / 240V POWER 120V / 240V POWER

USED WITH SC-SC-TK-400 TWINNING

AND PARALLELING KIT TYPICAL WIRING DIAGRAMS

HVAC Unit 1

HVAC UNIT 2 24V SC-SC-TK-400 1 2 3 4 5 6 7 8 SC-LLC-200 LEAD/LAG CONTROL Signal 1 IN Signal 2 IN Unit 1 Unit 1 Unit 2 Unit 2 24V R 24V C Y1 W1 G R X Y1 W1 G R X HVAC UNIT 1 HVAC UNIT 2 Y1 W1 G R X Y1 Y2 W1 W2 G O/B R X SINGLE-STAGE STAT THERMOSTAT TERMINALS WIRING DIAGRAM USING SC-LLC-200 LEAD/LAG CONTROLLER AND SC-SC-TK-400 TWINNING KIT FOR COOLING LEAD/LAG 5351 East Thompson Road, Suite 128, Indianapolis, IN 46237 Phone 888.359.0365 www.specifiedcontrols.com

HVAC Unit 1

HVAC UNIT 2 24V SC-TK-400 1 2 3 4 5 6 7 8 SC-LLC-200 LEAD/LAG CONTROL Signal 1 IN Signal 2 IN Unit 1 Unit 1 Unit 2 Unit 2 24V R 24V C Y1 W1 G R X Y1 W1 G R X HVAC UNIT 1 HVAC UNIT 2 Y1 Y2 W1 W2 G R X Y1 Y2 W1 W2 G O/B R X MULTI-STAGE STAT THERMOSTAT TERMINALS WIRING DIAGRAM USING SC-LLC-200 LEAD/LAG CONTROLLER AND SC-TK-400 TWINNING KIT FOR COOLING LEAD/LAG WITH UPSTAGING 5351 East Thompson Road, Suite 128, Indianapolis, IN 46237 Phone 888.359.0365 www.specifiedcontrols.com