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MV100 ELECTRIC CONTROLLERS T100, T200 THERMOSTATIC CONTROLLERS AND V2000 RADIATOR VALVES
TROUBLESHOOTING
Refer to Table 6 for troubleshooting details.
Symptom
Not all sections of the
Many radiators are oversized and
radiator are heating.
not all sections heat to maintain
the desired temperature.
Underheating
Sensor in the wrong location.
T100A,M Controller mounted in a
vertical position above the hot
pipe.
Excess capillary tubing coiled
above or too close to the heat
source.
Flow through the valve is in the
wrong direction.
Inadequate system temperature or
pressure.
Defective steam traps.
Airlock in the hot water system.
Scale or debris blocks flow.
Heating cabinet dampers are
closed.
Single-pipe: Blocked vent.
Overheating
Sensor in the wrong location.
Control not properly installed.
Capillary tube broken, kinked or
bent sharply.
Dirt or scale under the seat
prevents tight shutoff.
Flow through the valve is in the
wrong direction, damaging the
valve seat.
Defective steam traps.
Excessive differential pressure
forces the valve open (hot water
systems).
Single-pipe: Insufficient air in
system.
Chattering or knocking. Flow through the valve in the
wrong direction.
Vacuum in the system.
Excessive differential pressure.
Bent piping.
62-3048—2
Table 7. T100/V2000 Troubleshooting.
Possible Cause
System is operating properly.
Change the sensor location or change the control type. See
Installation Instructions.
Mount the T100A,M horizontally, or switch controller to a T100F.
Coil excess capillary tubing below or away from the heat source.
Check the arrow on the valve body. It should be in the direction of
the flow. Change the valve direction or flow direction.
Check boiler operating and limiting controls, circulating pump, and
isolating valves.
Repair or replace the traps.
Fully open the valve to allow air to pass. Install vents.
Flush the system. Do not use oil-based additives. Clean strainer
insert in steam applications.
Open or remove the dampers.
Remove and inspect vent. Replace if necessary.
Change sensor location or change control type.
Check for bosses and grooves, reset actuator on valve and tighten
knurled ring to valve body.
Replace control.
Remove the control from the valve body, allowing valve to open
fully and flush away scale and debris. Reinstall control. Turn fully
clockwise. If the valve does not close fully, remove the control and
cartridge (see Cartridge Replacement section). Always use a
strainer insert in steam applications.
Check the arrow on the valve body. It should correspond to the flow
direction. Change the valve direction or flow direction. Remove
valve cartridge and inspect seat disk for damage.
Repair or replace traps.
Install differential pressure regulator (D146A) to maintain less than
15 psi (103 kPa) differential between the supply and return pipes.
Check boiler cycling and system vacuum breakers. Repair or
replace breakers as necessary.
Check the arrow on the valve body. It should correspond to the flow
direction. Change the valve direction or flow direction.
Steam—check traps and vents.
Hot water—check expansion tank operation and location.
Install differential pressure regulator (D146A) to maintain less than
15 psi (103 kPa) differential between the supply and return pipes.
Ensure adequate space for piping.
12
Solution
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