Wiring - 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

When an existing thermostat controller is replaced, remove and label the wires to identify the terminal functions. When a T612 Thermostat Controller is replaced, simply remove the old screw terminal blocks and reinsert them onto the PCB of the replacement thermostat controller.

CAUTION

Risk of Electric Shock.
Disconnect the power supply before making electrical connections to avoid electric shock.

ATTENTION

Risque de décharge électrique.
Débrancher l'alimentation avant de réaliser tout raccordement électrique afin d'éviter tout risque de décharge électrique.

CAUTION

Risk of Property Damage.
Do not apply power to the system before checking all wiring connections. Short circuited or improperly connected wires may result in permanent damage to the equipment.

ATTENTION

Risque de dégâts matériels.
Ne pas mettre le système sous tension avant d'avoir vérifié tous les raccords de câblage. Des fils formant un court-circuit ou connectés de façon incorrecte risquent d'endommager irrémédiablement l'équipement.

Important: Make all wiring connections in accordance with local, national, and regional regulations. Do not exceed the electrical ratings of the T612 Thermostat Controller.

To wire the thermostat controller:

Procedure

Strip the ends of each wire a 1/4 in. (6 mm) and connect them to the appropriate screw terminals as indicated in Table 1 and Figure 1 through Figure 3.
Carefully push any excess wire back into the wall.

Note: Seal the hole in the wall with fireproof material to prevent drafts from affecting the ambient temperature readings.
Reinsert the screw terminal blocks onto the PCB.

Note: If multiple wires are inserted into the terminals, be sure to properly twist the wires together prior to inserting them into the terminal connectors.
For PIR models, carefully reattach the PIR connector to the PCB.
Reattach the thermostat controller cover to the mounting base (top side first).

Use a Phillips-head screwdriver to reinstall the security screw on the bottom of the thermostat controller cover, if desired. The security screw comes packaged separately in a plastic bag with the thermostat controller.

Table 1. Terminal Identification (See Figure 1 )
Terminal Number	Terminal Label	Function
1	Fan-H	Fan On – High
2	Fan-M	Fan On – Medium
3	Fan-L	Fan On – Low
4	24 V~ Hot	24 VAC from Transformer
5	24 V~ Com	24 VAC (Common) from Transformer
6	BO5 Aux	Aux BO (Auxiliary Output)
7	BO5 Aux	Aux BO (Auxiliary Output)
8	BO3	Open Heat
9	BO4	Close Heat
10	BO1	Open Cool
11	BO2	Close Cool
12	BI1	Configurable Binary Input 1
13	RS	Remote Room Temperature Sensor
14	Scom	Sensor Common
15	BI2	Configurable Binary Input 2
16	UI3	Configurable Universal Input 3

Results

Figure 1. Wiring the T612DFH-4 or T612DFH-4+PIR Thermostat Controller (See Table 1 )

Figure 2. Wiring the T612DFH-4 Thermostat Controller for On/Off Control

Figure 3. Wiring the T612DFH-4 Thermostat Controller for Floating Control