Submittal Sheet

62-3057
3
T100B,C CONTROLLERS
TROUBLESHOOTING
Symptom Possible Cause Solution
Not all sections
of radiator
heating
Many radiators are oversized and not
all sections heat to maintain the
desired room temperature.
System is OK.
Underheating Sensor is in the wrong location. Change sensor location (see Installation section),
or change control type.
Capillary tube excess coiled above or
too near to the heat source.
Coil below or away from heat source.
Flow through the valve is in the wrong
direction.
Check the arrow on the valve body. It should be in
the direction of the flow. Change valve direction, or
flow direction.
Inadequate system temperature or
pressure.
Check operating and limiting controls on the boiler.
Check circulating pump and isolating valves.
Steam traps are defective. Repair or replace traps.
Airlock in hot water system. Open valve fully to allow air to pass. Install vents.
Scale or debris is blocking flow. Flush system. Do not use oil base additives.
Heating cabinet dampers closed. Open or remove dampers.
Overheating Sensor is in the wrong location. Change sensor location (see Installation section),
or change control type.
Control not properly installed. Reset actuator on valve and tighten threaded ring to
valve body.
Capillary tube broken, kinked or bent
sharply.
Replace control.
Dirt or scale under seat preventing
tight shutoff.
Remove control from valve body, allowing valve to
open fully and flush away scale and debris. Reinstall
control and turn fully clockwise. If valve does not
fully close, remove control and inspect valve seat
area using cartridge replacement tool or service
socket tool.
Flow through the valve is in the wrong
direction, damaging the valve seat.
Check arrow on the valve body. It should be in the
direction of the flow. Change valve direction, or flow
direction. Remove valve cartridge and inspect for
damage to seat disk.
Steam traps are defective. Repair or replace traps.
Excessive differential pressure is
forcing valve open. (Hot water
systems.)
Install differential pressure regulator (D146A) to
maintain less than 15 psi (103 kPa) differential
between the supply and return pipes.
Chattering or
knocking.
Flow through valve is in the wrong
direction.
Check the arrow on the valve body. It should be in
the direction of the flow. Change valve direction, or
flow direction.
Vacuum in 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