Johnson Controls T25 Installation Instructions Manual

Issue Date 05/27/14 T25 Two-Stage Room Thermostat Application Requirements T25 thermostats are for line- or low-voltage service requiring accurate control of two operating functions. There are two stages of control for heating and cooling with automatic changeover on three- and four-pipe fan coil installations and similar applications. Typical uses are for compressor controls, relays, valves, fan coils, and other applications where low differentials and accurate sensing are required. Installation IMPORTANT: Use this T25 Two-Stage Room Thermostat only as an operating control. Where failure or malfunction of the thermostat c ...

0.28 (7.1) 0.15 (3.8) x 2.84 (72) 1.44 (37) Figure 1: T25A Dimensions, in. (mm) Mounting Plate Studs High Temperature Stop Set Point Knob Figure 2: Inside View of T25 Wall Box Mounting To mount the thermostat to an electrical conduit box, proceed as follows: 1. Remove the external adjustment knob, when furnished, by loosening the knob set screw using the provided Allen wrench. Slide the knob from the adjustment shaft. 2. Remove the cover by loosening the Allen-head screws at the top and bottom of the thermo ...

two machine nuts referred to in Step 3. 9. Refer to the Wiring section to connect the terminals on the Pennswitches. 10. If a high temperature stop is desired, proceed to the Setup and Adjustments section. Wall Surface Mounting To mount the thermostat directly to an interior wall surface (no electrical box) proceed as follows: 1. At the desired thermostat location, make an opening in the wall approximately 1/2 in. in diameter, and pull the wires through it. 2. Plug the rest of the wall opening to prevent drafts from affecting the operation of the thermostat (when applicable). 3. Remove the adjustin ...

HI-TEMP. RB , RY indicates LO-TEMP. D represents differential between stages. H represents High. L represents Low. H H H Figure 3: Two-stage Control Switching Action Hot Hot or Neutral Power Supply Cooling Equipment Heating Equipment Hot (240 VAC) or Neutral (120 VAC) YH YL BH BL RH RL Figure 4: Typical Wiring for One-stage Heating and One-stage Cooling Hot Hot or Neutral Power Supply 2nd Stage Cooling Hot (240 VAC) ...

The indicator line on models with knobs denotes the thermostat dial setting. Concealed adjustment models have internal adjustment dials. Adjust concealed dial models (with the cover removed) by turning the dial and lining up the desired dial setting at a 9 o’clock position when the thermostat is vertical. Calibration The T25 thermostats are factory calibrated. Do not attempt field calibration. Set Screw High Temperature Stop Set Point Knob Figure 9: Setting the High Temperature Stop Commissioning the High Temperature Stop If a high temperature stop is desired, refer to Figure 9 and follow the procedure described below. 1. Turn t ...

Motor Ratings 120 V 208 V 240 V 277 V AC Full Load Amperes 6.0 3.5 3.0 - AC Locked Rotor Amperes 36.0 21.0 18.0 - Non-inductive Amperes 10.0 9.2 8.0 7.2 Pilot Duty—125 VA 24 to 277 VAC Note: When used as a two-circuit switch, the total connected load must not exceed 2,000 VA. Technical Data Product T25 Two-Stage Room Thermostat Output Single Pole, Double Throw (SPDT) Switches Two Enclosed Pennswitches Cover Cold Rolled Steel with “Tawny Silver” Finish Differential (Mechanical) Each Stage 0.7F° (0.4C°) Approximately Between Stages 3F° (1.7C°) Non-Adjustable Supply Voltage 24 V, 120 V, 208 V, 240 V, 277 V Mounting Wi ...