MV100 ELECTRIC CONTROLLERS T100, T200 THERMOSTATIC CONTROLLERS AND V2000 RADIATOR VALVES
TROUBLESHOOTING
Refer to Table 6 for troubleshooting details.
Table 7. T100/V2000 Troubleshooting.
Symptom | Possible Cause | Solution |
Not all sections of the | Many radiators are oversized and | System is operating properly. |
radiator are heating. | not all sections heat to maintain |
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| the desired temperature. |
|
Underheating | Sensor in the wrong location. | Change the sensor location or change the control type. See |
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| Installation Instructions. |
| T100A,M Controller mounted in a | Mount the T100A,M horizontally, or switch controller to a T100F. |
| vertical position above the hot |
|
| pipe. |
|
| Excess capillary tubing coiled | Coil excess capillary tubing below or away from the heat source. |
| above or too close to the heat |
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| source. |
|
| Flow through the valve is in the | Check the arrow on the valve body. It should be in the direction of |
| wrong direction. | the flow. Change the valve direction or flow direction. |
| Inadequate system temperature or | Check boiler operating and limiting controls, circulating pump, and |
| pressure. | isolating valves. |
| Defective steam traps. | Repair or replace the traps. |
|
|
|
| Airlock in the hot water system. | Fully open the valve to allow air to pass. Install vents. |
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|
|
| Scale or debris blocks flow. | Flush the system. Do not use |
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| insert in steam applications. |
| Heating cabinet dampers are | Open or remove the dampers. |
| closed. |
|
| Remove and inspect vent. Replace if necessary. | |
|
|
|
Overheating | Sensor in the wrong location. | Change sensor location or change control type. |
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|
|
| Control not properly installed. | Check for bosses and grooves, reset actuator on valve and tighten |
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| knurled ring to valve body. |
| Capillary tube broken, kinked or | Replace control. |
| bent sharply. |
|
| Dirt or scale under the seat | Remove the control from the valve body, allowing valve to open |
| prevents tight shutoff. | fully and flush away scale and debris. Reinstall control. Turn fully |
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| clockwise. If the valve does not close fully, remove the control and |
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| cartridge (see Cartridge Replacement section). Always use a |
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| strainer insert in steam applications. |
| Flow through the valve is in the | Check the arrow on the valve body. It should correspond to the flow |
| wrong direction, damaging the | direction. Change the valve direction or flow direction. Remove |
| valve seat. | valve cartridge and inspect seat disk for damage. |
| Defective steam traps. | Repair or replace traps. |
|
|
|
| Excessive differential pressure | Install differential pressure regulator (D146A) to maintain less than |
| forces the valve open (hot water | 15 psi (103 kPa) differential between the supply and return pipes. |
| systems). |
|
| Check boiler cycling and system vacuum breakers. Repair or | |
| system. | replace breakers as necessary. |
Chattering or knocking. | Flow through the valve in the | Check the arrow on the valve body. It should correspond to the flow |
| wrong direction. | direction. Change the valve direction or flow direction. |
| Vacuum in the system. | |
|
| Hot |
| Excessive differential pressure. | Install differential pressure regulator (D146A) to maintain less than |
|
| 15 psi (103 kPa) differential between the supply and return pipes. |
| Bent piping. | Ensure adequate space for piping. |
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12 |