Spirax Sarco 37D, Installation And Maintenance Instructions Manual

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IM-P102-04 CTLS Issue 7
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3.1
When the valve is installed and the control system is fitted with the bulb in the medium to be controlled
it may be brought into operation as follows.
In most new installations dirt collects in the steam line during construction. It is always advisable to
blow this out on initial start-up.
Remove the cap on the strainer before the steam trap, crack open the steam supply blowdown to clear
dirt, shut-off and replace cap.
It is essential that the screen in the main line strainer is not removed during this operation.
If a blowdown cock is fitted to the strainer cap as mentioned in Section 2 it can be opened to blow out
the dirt without removing the cap.
3.2
Check that the temperature scale can be easily seen.
If it is fitted in a confined space facing a wall for example the control head may be repositioned to
enable the scale to be more easily read as follows:
Undo the three screws. The control head may now be turned through 120° or 240° and the screws
tightened up.
3.3
By turning the knurled knob, set the scale opposite the pointer to the temperature at which it is desired
to control. (Where it is essential that this temperature is not exceeded it is advisable to set the control
initially some 6 °C (43 °F) lower and bring the plant up to temperature slowly).
1. Put the plant in operation in the normal way allow 30 minutes for it to settle down, then check the
temperature against a reliable thermometer - this check reading should be taken as close to the
control point as possible to ensure that both the thermometer and the sensor bulb are sensing
similar conditions.
2. Compare the thermometer reading with the scale reading on the temperature control.
3. This may be found to differ by a few degrees and if precise control is required can be adjusted by
resetting the pointer as follows:
4. Holding the control head tightly onto the pilot valve housing - slacken the three screws, just
sufficiently to enable the pointer to be moved to the right or left until the temperature indicated on
the scale corresponds with the actual temperature as shown on the sensor.
Whilst making this adjustment it is essential to hold the control head tightly onto the pilot valve
housing otherwise not only will movement of the pointer be difficult but allowing the head to lift
will open the pilot valve.
5. Tighten the three screws.
6. The adjustment knob may now be reset to the required temperature. Adjustments to raise or lower
the temperature may be freely made without damage to the control system.
Important
Direct injection systems
This product contains a rust inhibitor to protect it against corrosion during storage. To avoid
any possible contamination of your product, after first blowing down the approach pipework, we
recommend that the valve is blown through thoroughly in order to remove any trace of the inhibitor.
3. Start-up