Installation Instructions for Siemens Outside Air Sensor 536-778

Quick guide from the manual

The Siemens Outside Air Sensor (Model 536-778) is designed to provide temperature input to a controller. The installation method depends on the distance between the utility mounting box and the outlet end of the pulling elbow:

• Option A: Use if the distance is less than 22 inches (56 cm).
• Option B: Use if the distance is greater than 22 inches (56 cm).

Prerequisites: The preferred location is the north side of the building in the shade, protected from direct sunlight and exhaust drafts. Ensure all wiring complies with the National Electrical Code (NEC) and local regulations.

Required Tools

• Power screwdriver with standard screw chuck or medium flat-blade screwdriver
• Wire cutter/stripper
• Drill and drill bits

Option A Installation

1. Use an existing opening or drill an opening through the outside wall for 1/2-inch (13 mm) rigid conduit. The sensor must be located three to six inches (7.5 to 15 cm) from the wall.
2. Feed the sensor leads through the rigid conduit to the utility box inside the building. Thread the sensor onto the rigid conduit.
3. Rotate the sensor so that the shield points down to shade the sensing element from direct and indirect sunlight.
4. Connect the sensor leads to the field wiring inside the utility box.
5. Connect the field wiring to the controller as shown in the wiring diagram.

Option B Installation

1. Drill an opening through the outside wall for 1/2-inch (13 mm) rigid conduit. The sensor must be located three to six inches (7.5 to 15 cm) from the wall.
2. Remove the pulling elbow cover and gasket.
3. Pull the sensor lead wires from the pulling elbow and thread the pulling elbow/sensor assembly onto the conduit.
4. Rotate the sensor so that the shield points down to shade the sensing element.
5. Cut off excess sensor wire leads approximately one inch (25 mm) from the pulling elbow and strip 3/8-inch (9.5 mm) of insulation.
6. Pull the field wiring to the pulling elbow and connect it to the sensor wiring.
7. Replace the pulling elbow cover and gasket, ensuring the gasket seals the elbow.
8. Connect the field wiring at the controller as shown in the wiring diagram.

Wiring

Refer to the wiring diagram for connection details. Some Siemens Building Technologies controllers may require a shield termination. For individual panel wiring details, refer to the appropriate hardware manual.