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

 

 

the desired temperature.

 

Underheating

Sensor in the wrong location.

Change the sensor location or change the control type. See

 

 

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

 

 

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.

 

 

 

 

Scale or debris blocks flow.

Flush the system. Do not use oil-based additives. Clean strainer

 

 

insert in steam applications.

 

Heating cabinet dampers are

Open or remove the dampers.

 

closed.

 

 

Single-pipe: Blocked vent.

Remove and inspect vent. Replace if necessary.

 

 

 

Overheating

Sensor in the wrong location.

Change sensor location or change control type.

 

 

 

 

Control not properly installed.

Check for bosses and grooves, reset actuator on valve and tighten

 

 

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

 

 

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.

 

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).

 

 

Single-pipe: Insufficient air in

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.

Steam—check traps and vents.

 

 

Hot water—check expansion tank operation and location.

 

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.

 

 

 

62-3048—2

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