Location Considerations - Johnson Controls - 24-9890-1397 - T612DFH-4 - T612DFH-4+PIR - T612DFH-4 and T612DFH-4+PIR Thermostat Controllers with Fan Control and Occupancy Sensing Capability

About this task

Locate the T612 Thermostat Controller:

on a partitioning wall, approximately 5 ft (1.5 m) above the floor in a location of average temperature
away from direct sunlight, radiant heat, outside walls, outside doors, air discharge grills, or stairwells; and from behind doors
away from steam or water pipes, warm air stacks, unconditioned areas (not heated or cooled), or sources of electrical interference

For integrated Passive Infrared (PIR) models, be sure that the thermostat controller is located centrally, where occupant movement is abundant.

Note: Allow for vertical air circulation to the thermostat controller.

To install the thermostat controller:

Procedure

Use a Phillips-head screwdriver to remove the security screw if it is installed on the bottom of the thermostat controller cover.

Note: Normally, the security screw comes packaged separately in a plastic bag with the thermostat controller. Skip this step if the screw is not installed on the bottom of the cover.
Pull the bottom edge of the thermostat controller cover and open the thermostat controller as illustrated in Figure 1.

Note: PIR models have a wiring connection between the cover and the Printed Circuit Board (PCB). This connection allows for proper wiring of the occupancy sensor. Carefully remove the wiring connection from the PCB by pulling up on the connector block. Do not attempt to remove the connector block by pulling on the wires.

Figure 1. Removing the Thermostat Controller Cover (T612DFH-4+PIR Model Shown)
Carefully pull the locking tabs on the right side of the thermostat controller mounting base and unlock the PCB. Open the PCB to the left as illustrated in Figure 2.
Pull approximately 6 in. (152 mm) of wire from the wall and insert the wire through the hole in the thermostat controller mounting base.
Align the thermostat controller mounting base on the wall and use the base as a template to mark the two mounting hole locations.

Note: Be sure to position the thermostat controller mounting base so that the arrow on the base points upward to indicate the top of the thermostat controller.

Figure 2. Opening the Thermostat Controller PCB
Drill a 3/16 in. (5 mm) hole at each of the two marked locations and tap nylon anchors (included with the thermostat controller) flush to the wall surface.

Note: Other means of anchoring the device may be desired, depending on the wall medium.
Position the thermostat controller mounting base on the wall and use the two mounting screws (included with the thermostat controller) to secure the base to the wall surface as illustrated in Figure 3.

Note: Be careful not to overtighten the mounting screws.

Figure 3. Securing the Thermostat Controller Mounting Base to the Wall
Swing the PCB back to the right and carefully snap it into the locking tabs on the thermostat controller mounting base.
Remove the screw terminal blocks that are attached to a disposable adhesive. Figure 4 illustrates the locations of the screw terminal blocks on the thermostat controller.

Figure 4. Removing the Screw Terminal Blocks