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Series-MAO
Manual Analog Override Switch, Alarm
- Manual override for analog control: The ACI MAO installs between a controller and actuator to provide adjustable manual analog override when needed.
- Supports two independent outputs: Routes two analog signals in normal operation and allows each output to be switched from automatic to manual independently.
- Ideal for actuator troubleshooting: Useful for temporary override during controller issues, actuator checkout, linkage testing, and system commissioning.
- Flexible signal compatibility: Selectable output ranges include 0-5 VDC, 0-10 VDC, 0-15 VDC, and 0-20 mA for common BAS control applications.
- Alarm feedback during override: Provides an alarm contact output to indicate when manual override is active, helping operators identify overridden equipment.
- Adjustable field control: Potentiometers allow technicians to vary each manual output signal directly during setup or service.
- Panel-friendly installation: Compact snap-track mounted board with 45° captive screw terminals supports clean installation in control panels.
- Reliable interface design: Operates on 24 VAC or 24 VDC power and includes RoHS2 and WEEE approvals for building automation projects.
Product Overview
- Accuracy ± 4 %
- Alarm Note Optional Resistive Alarm Output: 3 Watts or 2A maximum (state resistance value when ordering), Alarm Output Current Rating: 2A maximum
- Analog Input Note Override Analog Input Voltage Range: 0-24 VDC (Manual Mode); Override Analog Input Current: 2A maximum (Manual Mode); Override Analog Input (Selectable) Range (@ Impedance): 0-5 VDC @ 250Ω minimum 0-10 VDC @ 500Ω minimum 0-15 VDC @ 750Ω minimum 0-20 mA @ 750Ω maximum
- Analog Output Note Override Analog Output Voltage Range: 0-24 VDC; Override Analog Output Current: 2A maximum or same as override input (Auto Mode)
- Approvals RoHS2, WEEE
- Control Output NO/NC
- Height 1.25 in
- Length 3.75 in
- Materials PVC
- Operating Humidity 10 to 95% RH, non-condensing
- Operating Temperature, Max 120 °F
- Operating Temperature, Min 35 °F
- Series ID Series-MAO
- Storage Temperature, Max 150 °F
- Storage Temperature, Min -20 °F
- Supply Current 100 mA
- Tightening Torque 0.5 Nm (Minimum); 0.6 Nm (Maximum)
- Weight 0.29 lb
- Width 3.25 in
- Wire Gauge 26 to 16 AWG
Supported Applications
The ACI Series MAO (Manual Analog Override Switch, Alarm) installs between a controller and an actuator to provide adjustable analog manual override. The series is designed for scenarios requiring temporary override if the controller malfunctions or during checkout of actuator and linkage operation. An optional alarm output contact provides feedback when the switch is in the manual position.
Operating Conditions & Performance
The Series MAO operates within an ambient temperature range of 35 to 120°F (1.7 to 48.9°C) and a humidity range of 10 to 95% non condensing. Storage is supported from 0 to 150°F (-17.8 to 65.5°C). The unit requires a power supply of 24 VAC or 24 VDC, +/- 10%, with a maximum supply current of 100 mA.
Performance specifications include an accuracy of +/- 4% of maximum output. In manual mode, the override analog input voltage range is 0-24 VDC and the override analog input current is 2A maximum. The selectable override analog input ranges are:
- 0-5 VDC @ 250Ω minimum
- 0-10 VDC @ 500Ω minimum
- 0-15 VDC @ 750Ω minimum
- 0-20 mA @ 750Ω maximum
The override analog output voltage range is 0-24 VDC, with an override analog output current of 2A maximum or the same as the override input in Auto Mode.
Electrical Connections and Ratings
- Connections: 45° Captive Screw Terminal Blocks
- Wire Size: 16 (1.31 mm²) to 26 AWG (0.129 mm²)
- Torque Rating: 0.5 Nm (Minimum); 0.6 Nm (Maximum)
Configuration Options
The Series MAO supports configurable alarm outputs and optional accessories to suit specific installation needs.
- Alarm Output: N.O. in auto, N.C. in manual (optional: N.C. in auto, N.O. in manual). The alarm output current rating is 2A maximum.
- Optional Resistive Alarm Output: 3 Watts or 2A maximum; the resistance value must be stated when ordering.
The housing material is Polyvinyl Chloride (PVC) with a UL94 V-0 flammability rating. The product dimensions are (L) 3.75" (W) 3.25" (H) 1.25" (95.25 x 82.55 x 31.75 mm), and the weight is 0.29 lbs. (0.131 Kg).
Available Accessories
- A/D0008: Transient Voltage Suppressor, Bi-directional, 56 VAC/DC, 1500W (Item # 142583)
- A/DRC 2.7 X 3.25: DIN Rail Adapter Kit (Item # 142624)
Key Product Differences
The Series MAO is identified by the model number guide: MAO - <OPTION> - <ITEM_NUMBER>. The standard configuration (Item # 102588) includes the Manual Analog Override Switch with Alarm. Variations are defined by the selection of alarm contact logic and resistive load requirements.
The series holds RoHS2, WEEE, and UL94 V-0 approvals. Installation notes specify that power must be removed before wiring and shielded cables should be grounded only at the controller end to prevent ground loops. When sharing 24 VAC or 24 VDC power with inductive loads such as relays or solenoids, a Transient Voltage Suppressor (e.g., ACI Part: 142583) is required across each coil.
