Schneider Electric (Barber Colman) TK-1001 Thermostat

The Schneider Electric (Barber Colman) TK-1001 Pneumatic Room Thermostat is a direct-acting, 2-pipe, heating thermostat built for proportional control of pneumatically activated valves, dampers, and similar devices in HVAC systems. Direct acting means the thermostat raises its branch output pressure as room temperature rises, which is how it modulates a heating valve or damper actuator instead of just switching it on and off. The dial covers 55°F to 85°F, the unit leaves the factory at a 75°F setpoint, and it runs on a 15 or 20 psig main air supply connected with 5/32" plastic tubing.

The part that separates a well-behaved pneumatic zone from one that hunts is the throttling range. The TK-1001 ships with a 4°F per 10 psi throttling range and adjusts from 2°F to 10°F per 10 psi: tighten it for a small, responsive zone, or open it up on a large space that reacts slowly. Calibration is straightforward — with the setpoint matched to room temperature the branch line should sit at a nominal 8 psig, within a ±1 psi tolerance. Air consumption is a low 0.008 scim with a 16 scim capacity, and the supply and branch connections are coded M (main) and B (branch) so the tubing goes on the right way the first time.

Mounting uses either an external wall fitting (ordered separately) or a standard electrical switch box with the supplied mounting plate and Allen-head screws. If your old thermostat is stamped TK-1001-0-2, TK-1001-105, TK-1001-119, TK-1001-139, TK-1001-398, TK-1001-399, TK-1001-400, TK-1001-403 or TK-1001-404, TK-1001 is the current number for it. Two neighbors are different thermostats: TK-1001-116 (13°C to 29°C dial) and TK-1001-600 (aspirated). The cooling counterpart is the reverse-acting TK-1101, so confirm the action before you swap one for the other.

Key Benefits

• Direct-Acting Heating Control: Output pressure rises with room temperature, matched to the 2-pipe heating applications this model is made for.
• Adjustable Throttling Range: Dial from 2°F to 10°F per 10 psi to stop hunting in a tight zone or smooth out a slow one.
• Standard Pneumatic Hookup: 15 or 20 psig supply and 5/32" plastic tubing, with M and B connections coded for a clean install on existing lines.
• Low Air Consumption: Just 0.008 scim consumption keeps load off the compressor and drier on an aging pneumatic system.

Common Questions

• Which old numbers does this replace? TK-1001-0-2, TK-1001-105, TK-1001-119, TK-1001-139, TK-1001-398, TK-1001-399, TK-1001-400, TK-1001-403 and TK-1001-404 all cross-reference to TK-1001.
• What branch pressure should I see after installing it? With the setpoint equal to room temperature, expect a nominal 8 psig on the branch line (8 ±1 psi), measured with 15 or 20 psig main air.
• Does direct acting mean it is for cooling? No. Direct acting describes how branch pressure moves with temperature. The TK-1001 is the heating, 2-pipe version; the TK-1101 is the reverse-acting, cooling counterpart.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.