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    Leviton OSP20-RxH — Occupancy Sensor AutoON/Override Power Pack Installation Instructions

    August 31, 2026 6 min read

    Installation instructions for the Leviton OSP20-RxH Occupancy Sensor AutoON/Override Power Pack — wiring, operation modes, and troubleshooting.

    💾 Download Original PDF 🛒 View Product
    Full text manual (for reference)

    Installation instructions for the Leviton OSP20-RxH Occupancy Sensor AutoON/Override Power Pack — a control power pack used with OSCxx, OSWxx, ODCxx, and ODWxx occupancy sensors for automated or manual lighting and HVAC control.

    Overview

    The power pack contains a power supply, a load switching relay, and an HVAC relay. The power supply provides Class II low-voltage power for compatible occupancy sensors, and can also power the OSA20 Add-A-Relay accessory. Multiple occupancy sensors can connect to a single power pack to fully cover a space, and the built-in zero-cross switching circuitry minimizes inrush current with incandescent and electronic ballasts, extending relay life.

    Features

    • Title 24 compliant
    • Hold On / Hold Off capabilities
    • Regulated 24VDC, 150mA output current
    • Mounts inside a fluorescent ballast cavity
    • Mounts inside or outside a junction box
    • Rated for plenum spaces

    Ratings

    Part Number HVAC Relay Power Input Power Output
    OSP20-RxH Yes 120–277VAC, 50/60Hz 24VDC, 150mA, 3.6W

    Load ratings: 20A/2400W @ 120V, 60Hz (incandescent); 20A/2400VA @ 120V, 60Hz (fluorescent); 20A/5540VA @ 277V, 60Hz (fluorescent); 1/2 HP @ 120V motor load; 2 HP @ 240/277V, 60Hz motor load; 0.5A @ 120V or 1A @ 30VDC HVAC relay.

    Safety Warnings

    • Install and/or use in accordance with appropriate electrical codes and regulations.
    • If unsure about any part of these instructions, consult an electrician.
    • Use with copper or copper-clad wire only.
    • Disconnect power before servicing the fixture or changing lamps.
    • Warning: to avoid fire, shock, or death, turn off power at the circuit breaker or fuse and test that power is off before wiring.

    Installation

    1. Turn off power at the circuit breaker/fuse and confirm power is off before wiring.
    2. Mount the power pack per the desired application: outside a 4"x4" junction box (via 2" EMT nipple), inside a 4"x4" junction box, inside the ballast cavity of a light fixture, or outside the ballast cavity. Ensure conduit/cable entry clamps sit in the corner of the junction box, and dress wires for clearance once the device is installed.
    3. Caution: low-voltage wires must be dressed separately from high-voltage (Class I) conductors, per local code — Teflon-jacketed Class II wires may be required for adequate insulation from the high-voltage wiring.
    4. Line voltage wiring: strip 5/8" (1.6 cm) of insulation from each circuit conductor, keep ends straight, connect Power Pack leads to LINE per the appropriate wiring diagram, twist strands tightly, push firmly into wire connectors, screw clockwise ensuring no bare conductor is exposed, and secure each connector with electrical tape.
    5. Class II and HVAC wiring: connect low-voltage wires from the Power Pack to the sensor per the appropriate wiring diagram, using the same twist/connect/tape procedure.
    6. Refer to the sensor's own installation instructions for further details.
    7. Restore power at the circuit breaker or fuse. Installation is complete.

    Operation

    The AutoOn/Override Power Pack turns ON and OFF automatically via an occupancy sensor input, a timer, panel or BAS input, and manually via an optional low-voltage momentary switch.

    • Auto ON: the occupancy sensor, Hold ON input, and optional momentary switch can all turn the load ON. If the load is turned OFF via the momentary switch, the power pack won't auto-turn it back ON until the sensor's time delay expires (useful in presentation mode) — pressing the momentary switch before that delay expires turns the load ON immediately. Once the delay expires, the pack reverts to AutoON mode and the load turns on with the next sensor input.
    • Manual ON: occupants must press the low-voltage momentary switch to turn the load ON. If the occupancy sensor is the only thing keeping the load ON, it turns OFF when the sensor's time delay expires — but if the sensor re-triggers within 30 seconds of that, the load turns back ON automatically. After 30 seconds with no sensor input, pressing the momentary switch is required again.

    Low-Voltage Inputs

    Input Function
    Occupancy Sensor (Blue) AutoON/AutoOFF. Applying 24V closes the relay (occupied); removing voltage opens it (vacant).
    Occupancy Sensor (Blue/White) ManualON/AutoOFF. Motion detection alone does nothing — a local momentary switch is needed to turn the load ON; the sensor still turns it OFF when its time delay expires.
    Hold ON (Yellow) For timer or panel input. Applying 24VDC closes the relay; removing voltage opens it if nothing else is holding it closed. Overrides Control ON.
    Hold OFF (Orange) For timer, panel, BAS, or load-shed input. Applying 24VDC opens the relay; removing voltage allows any other input to be accepted. Overrides Control ON and Hold ON.
    Local Switch (Yellow/Orange) For a low-voltage momentary switch. A momentary 24VDC input toggles the relay to the opposite state. Overrides Control ON, Hold ON, and Hold OFF.

    Wire Designations

    Signal Color Gauge
    Line 120–277V (OSP20-Rx0) Black 18 AWG
    Neutral White 18 AWG
    Load Blue 14 AWG
    Power (24VDC) Red 22 AWG
    DC Return Black 22 AWG
    Occupancy Auto ON Blue 22 AWG
    Occupancy Manual ON Blue/White 22 AWG
    Hold ON Yellow 22 AWG
    Hold OFF Orange 22 AWG
    Local Switch Input Yellow/Orange 22 AWG
    HVAC Common Green 22 AWG
    HVAC NO (Normally Open) Brown/White 22 AWG
    HVAC NC (Normally Closed) Brown 22 AWG

    All wires rated at 105°C, 600V insulation. Class II wires are Teflon-coated for plenum applications. HVAC wiring is Class I and Class II rated.

    Wiring Configurations Covered

    The full manual includes wiring diagrams for these configurations: Auto ON/Auto OFF with Manual OFF; Manual ON/Light Hold OFF/Auto OFF; Auto ON/Auto OFF with Light Hold ON; multiple occupancy sensors exceeding a single power pack's rating; multiple loads exceeding a single power pack's rating; and OSP20-RxH bi-level (2-zone) switching. Refer to the PDF for the exact diagrams matching your configuration.

    Application Notes — Splitting Loads/Sensors Across Multiple Power Packs

    • Load exceeds one power pack's rating: split the load between multiple power packs. Connect the Blue (occupancy) wires of all power packs and sensors together, and the Black (return) wires of all power packs and sensors together. Connect the Red (+24VDC) wires of the sensors to only one power pack's Red wire — never connect the Red wires of two different power packs together.
    • More sensors needed than one power pack can supply: use a primary power pack (switches the load) and secondary power packs (only supply low-voltage power to sensors, no load switching). Connect as many sensors as possible to the primary pack, and remaining sensors' Red wires to the secondary pack's Red wire. Connect all Black (return) wires together, and all sensor Blue (occupancy) wires together to the primary pack's Blue wire. Never connect Red wires of two different power packs together.

    Troubleshooting

    Symptom Likely Cause
    Lights flickering Bad lamp connection, or wires not secured firmly with wire connectors.
    Lights did not turn ON Tripped breaker/fuse; burned-out lamp; lamp neutral not wired; Hold OFF or Manual ON input active; low-voltage or line-voltage miswired (check the diagram).
    Lights stay ON Constant motion — test by adjusting sensor sensitivity or removing the motion source (HVAC, mask, or move the sensor).
    Lights turn ON too long Adjust sensor time-delay settings.
    Lights came ON during presentation AutoON mode connected and time delay expired — increase the sensor time delay or generate more motion during the presentation.
    Lights do not turn OFF with time delay Hold ON input is active.

    Low-Voltage Current Capacity

    Add-a-Relay current consumption is 50mA per unit. For the OSP20, total sensors plus total Add-a-Relays connected must not exceed 150mA combined.

    FCC Compliance (OSP20 only)

    Tested and found to comply with Class A digital device limits under Part 15 of the FCC Rules — designed to provide reasonable protection against harmful interference in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy; if not installed per the instruction manual, it may cause harmful interference to radio communications. Operation in a residential area is likely to cause interference, which the user would need to correct at their own expense.

    Warranty

    Leviton warrants this product to the original purchaser to be free of defects in materials and workmanship under normal, proper use for five years from the purchase date. Leviton's only obligation is to repair or replace, at its option, a defective product returned prepaid with proof of purchase and a description of the problem to Leviton Manufacturing Co., Inc., Attn: Quality Assurance Department, 201 North Service Road, Melville, New York 11747. This warranty excludes labor for removal or reinstallation, and is void if the product is installed improperly, in an improper environment, overloaded, misused, opened, abused, altered, or not used per instructions. No other express or implied warranties apply beyond the stated five-year term; Leviton is not liable for incidental, indirect, special, or consequential damages.