Jordan Valve Mark 82 Series – Internal Piloted Temperature Regulator - Manual (Page 2)

If You Experience Undercooling or Overcooling:
Be sure the coolant is circulating properly and that
all steps have been taken as indicated for under-
heating or overheating in the steps above.
If You Experience Thermal System Failure:
Thermal system failure is usually indicated by failure of the
regulator to respond to temperature changes, and when
all other trouble shooting steps have failed to correct the
problem. The adjusting spring will hold a direct acting
valve OPEN or reverse acting valve CLOSED.
The thermal system can be tested by placing the sens-
ing bulb in a container which can be quickly heated with
steam or hot water, or cooled with cold water or crushed
ice. Observe the valve stem while alternately heating and
cooling the bulb. If the stem does not move, it is likely that
the thermal system has lost its fi ll. The thermal system is
hermetically sealed and cannot be repaired in the fi eld. It
must be replaced by a complete, new thermal system or
the old unit must be repaired at the factory.
Start Up
Close the inlet and outlet shut-off valves. 1.
Slowly open the by-pass, and begin heating or cool- 2.
ing action.
Fully open the inlet shut-off valve. Then slowly open
3.
the outlet shut-off valve.
Close the by-pass valves when the approximate
4.
temperature is reached.
Allow approximately 30 minutes to reach stable op-
5.
eration before attempting to adjust the temperature
setting (and after each new setting).
To change the control temperature, rotate the ad-
6.
justing wheel downward to decrease and upward to
increase the temperature setting.
Note: These instructions apply to both the direct acting
and the reverse acting regulators. The reverse acting reg-
ulator is identical to the direct acting regulator except for
the design and operation of the pilot valve.
In the direct acting regulator, an increase of tem- 7.
perature at the sensing bulb will close the pilot valve
seats which causes the main valve seats to close.
In the reverse acting regulator, an increase of tem-
8.
perature at the sensing bulb will open the pilot valve
seats and main valve seats.
Therefore the reverse acting pilot valve assembly is an
inverted version of the direct acting pilot valve. However,
because of design differences, the upper bonnet of the
regulator must be replaced to change the valve action.
dius or larger is recommended.
Horizontal Mounting
3. – When the bulb is to be
mounted horizontally, it must be turned so that the
word TOP (stamped on the adaptor) faces upward.
Vertical Mounting
4. – No special precaution is re-
quired when the bulb is mounted vertically pointing
down.
Inverted Mounting
5. – A special capillary is required
if the tip of the bulb will be higher than the capil-
lary end. The temperature regulator equipped with
a standard capillary will not function properly in an
inverted position.
Insertion
6. – For accurate control, the entire length of
the bulb should be inserted. Avoid locating a bulb
in the direct path of steam or water. Never lay a bulb
on the bottom of the tank. Approximately 8” is suf-
fi cient distance from the source of heat or coolant
to the sensing bulb.
Pipeline Mounting
7. – When installing a sensing bulb
in piping, be sure that the pipeline is at least twice
the diameter of the sensing bulb so that free fl ow is
obtained around the bulb.
Finned Bulbs
8. – Finned bulbs should be installed at
right angles to the air movement. Good circulation
is required to sense the average temperatures.
When the bulb is installed at a point higher than the
9.
regulator itself, the range may be somewhat low-
ered. Conversely, the range may be raised if the
bulb is installed below the regulator.
Trouble Shooting
If You Experience Erratic Control:
An oversized valve causes cycling or hunting. An
undersized valve causes temperature to drop under
peak loads. Recalculate required size from Jordan
Catalog TCV.
Inlet pressure may be low.
Steam traps downstream my need reconditioning.
Foreign matter may be lodged in valve seats.
Valve stroke may be out of adjustment.
If You Experience Underheating:
Be sure the by-pass seats are fully open.
Be sue the inlet pressure is adequate.
Clean line strainer screens.
Clean steam traps and be sure they are working
properly. If the return line from the trap is cool, the
steam coil may be clogged.
If You Experience Overheating:
Overheating is often caused by foreign matter hold-
ing the valve seats in the open position. Inspect and
clean seats or replace them.
Check stroke adjustment.
Check for damage or failure of the thermal system.
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