| Application | Self-contained controller with sensor, setpoint dial and valve actuator in one unit. Adjustable limits. Mount horizontal. Not for use inside enclosures or in locations with restricted airflow around sensor. For V110 valves. |
| Used With | V110 |
| Temperature Range (F) | 43 F to 79 F |
| Collar Diameter (in.) | 1 19/32 in. |
| Sensor (Integral or Remote) | Integral |
| Setpoint (Integral or Remote) | Integral |
Description
The T104A1040 is a thermostatic radiator actuator from Resideo (Honeywell Home). It is the head that sits on the radiator valve and holds the room at the temperature set on the dial, with no power and no wiring.
The mechanism is a sealed charge that expands as the room warms and pushes the valve closed. Because it is entirely mechanical, it keeps working through a power cut and it never needs a battery — which is why TRVs are still specified on hydronic systems that have every other control electronic.
The high-capacity design matches the high-capacity valve bodies, which move considerably more water than a standard TRV. On a large cast-iron radiator or a long run of baseboard, standard capacity is the reason a zone never quite catches up on a cold morning.
What a working TRV takes: a valve body and a thermostatic head, ordered separately. This listing is the head.
Valve bodies this head is built for
- Resideo V110D1000/U Straight Pattern 1/2 in High Capacity Valve
- Resideo V110D1016/U Straight Pattern 1 in High Capacity Valve
- Resideo V110E1004/U Angle Pattern 1/2 in High Capacity Valve
- Resideo V110E1020/U Angle Pattern 1 in High-Capacity Valve
- Resideo V110F1002/U Horizontal Angle Pattern 1/2 in High Capacity Valve
- Brand: Resideo (Honeywell Home)
- Manufacturer Part #: T104A1040
- Type: Thermostatic radiator actuator
- Sensor: Integral
- Capacity: High capacity
- Shipping weight: 0.41 lb
- Category: Thermostatic Radiator Controls