iO-LL LEAD/LAG CONTROLLER INSTALLATION INSTRUCTIONS Indianapolis, IN 46237 www.iohvaccontrols.
INTRODUCTION The iO-LL 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 iO-LL, Unit 1 and Unit 2 output contacts remain open.
iO-LL LEAD/LAG CONTROLLER STAND ALONE APPLICATIONS TYPICAL WIRING DIAGRAMS Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLER WITH SINGLESTAGE COOLING UNITS IN PARALLEL iO-LL LEAD/LAG CONTROL 1 2 3 4 5 6 7 8 Y1 Y1 G G R X R C Y1 G R X Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLER WITH SINGLESTAGE COOLING UNITS IN PARALLEL WITH UPSTAGING iO-LL LEAD/LAG CONTROL 1 2 3 4 5 6 7 8 Y1 Y1 Y2 G G R X R C Y1 G R X Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLER FOR 2 PUMP SYSTEM WITH A RELAY TO TRIGGER LEAD/LAG iO-LL LEAD/LAG CONTROL 1 2 3 4 5 6 7 8 TRANSFORMER 24V LINE PUMP CONTROLLER PUMP 2 RELAY PUMP 1 PUMP 2 PUMP 1 RELAY 120V / 240V POWER Indianapolis, IN 46237 120V / 240V POWER www.iohvaccontrols.
iO-LL LEAD/LAG CONTROLLER USED WITH iO-TWIN TWINNING AND PARALLELING KIT TYPICAL WIRING DIAGRAMS Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLER AND iO-TWIN TWINNING KIT FOR COOLING LEAD/LAG iO-TWIN Y1 Y1 Y2 W1 W2 G O/B R X W1 G R X iO-LL LEAD/LAG CONTROL 1 2 3 4 5 6 7 8 Y1 W1 G R X Y1 W1 G R X Y1 Y2 W1 W2 G O/B R Y1 Y2 W1 W2 G O/B R R X Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLER AND iO-TWIN TWINNING KIT FOR COOLING LEAD/LAG WITH UPSTAGING iO-TWIN Y1 Y2 W1 W2 G Y1 Y2 W1 W2 G O/B R X R X iO-LL LEAD/LAG CONTROL 1 2 3 4 5 6 7 8 Y1 W1 G R X Y1 W1 G R X Y1 Y2 W1 W2 G O/B R Y1 Y2 W1 W2 G O/B R R X Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLER AND iO-TWIN TWINNING KIT FOR HEATING LEAD/LAG iO-TWIN Y1 Y1 Y2 W1 W2 G O/B R X W1 G R X iO-LL LEAD/LAG CONTROL 1 2 3 4 5 6 7 8 Y1 W1 G R X Y1 W1 G R X Y1 Y2 W1 W2 G O/B R Y1 Y2 W1 W2 G O/B R R X Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLER AND iO-TWIN TWINNING KIT HEATING LEAD/LAG WITH UPSTAGING iO-TWIN Y1 Y2 W1 W2 G Y1 Y2 W1 W2 G O/B R X R X iO-LL LEAD/LAG CONTROL 1 2 3 4 5 6 7 8 Y1 W1 G R X Y1 W1 G R X Y1 Y2 W1 W2 G O/B R Y1 Y2 W1 W2 G O/B R R X Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLERS AND iO-TWIN TWINNING KIT FOR HEATING AND COOLING LEAD/LAG iO-TWIN Y1 Y1 Y2 W1 W2 G O/B R X W1 G R X Y1 W1 G R X Y1 W1 G R X iO-LL LEAD/LAG CONTROL iO-LL LEAD/LAG CONTROL (HEATING) (COOLING) 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Y1 Y2 W1 W2 G O/B R Y1 Y2 W1 W2 G O/B R R X Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLERS AND iO-TWIN TWINNING KIT FOR HEATING AND COOLING LEAD/LAG WITH UPSTAGING iO-TWIN Y1 Y2 W1 W2 G Y1 Y2 W1 W2 G O/B R X R X Y1 W1 G R X Y1 W1 G R X iO-LL LEAD/LAG CONTROL iO-LL LEAD/LAG CONTROL (HEATING) (COOLING) 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Y1 Y2 W1 W2 G O/B R Y1 Y2 W1 W2 G O/B R R X Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLERS AND iO-TWIN TWINNING KIT FOR 1 HEAT / 1 COOL HEAT PUMP iO-TWIN Y1 Y1 Y2 W1 W2 G O/B R X G O/B R X iO-LL LEAD/LAG CONTROL 1 2 3 4 5 6 7 8 Y1 G O/B R X Y1 G O/B R X Y1 Y2 W1 W2 G O/B R Y1 Y2 W1 W2 G O/B R R X Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLERS AND iO-TWIN TWINNING KIT FOR 1 HEAT / 1 COOL HEAT PUMP WITH UPSTAGING iO-TWIN Y1 Y2 Y1 Y2 W1 W2 G O/B R X G O/B R X iO-LL LEAD/LAG CONTROL 1 2 3 4 5 6 7 8 Y1 G O/B R X Y1 G O/B R X Y1 Y2 W1 W2 G O/B R Y1 Y2 W1 W2 G O/B R R X Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLERS AND iO-TWIN TWINNING KIT AND RY-2 DPDT RELAY FOR 2 HEAT / 1 COOL HEAT PUMP iO-TWIN Y1 Y1 Y2 W1 W2 G O/B R X W G O/B R X iO-LL LEAD/LAG CONTROL 1 2 3 4 5 6 7 8 Y1 Y1 Y2 W1 W2 G O/B R W G O/B R X Y1 Y1 Y2 W1 W2 G O/B R W G O/B R X R X NC C NO NC C NO 24V Indianapolis, IN 46237 www.iohvaccontrols.
WIRING DIAGRAM USING iO-LL LEAD/LAG CONTROLLERS AND iO-TWIN TWINNING KIT FOR 2 HEAT / 1 COOL HEAT PUMP WITH UPSTAGING (Auxiliary / EH Heat Work Together) iO-TWIN Y1 Y2 W Y1 Y2 W1 W2 G O/B R X G O/B R X iO-TWIN LEAD/LAG CONTROL 1 2 3 4 5 6 7 8 Y1 W1 G O/B R X Y1 W1 G O/B R X Y1 Y2 W1 W2 G O/B R Y1 Y2 W1 W2 G O/B R R X Indianapolis, IN 46237 www.iohvaccontrols.
