Spirax Sarco 37D, Инструкция по установке и обслуживанию

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IM-P102-04 CTLS Issue 7
6
2.1 Supply (Fig. 1)
37D
The 37D Spirax Sarco temperature control is supplied with the temperature control unit and valve packed
separately, and should be assembled securing the control head to the valve by means of the three screws
supplied.
The temperature control unit is fitted with a control system having a range most suitable for the temperature
given on the order but it is not preset.
37DE
The 37DE Spirax Sarco temperature control is supplied as for the 37D but a solenoid operated valve is fitted
in the pipe between the pilot valve and the main diaphragm chamber, i.e. in series with the normal pilot valve.
The purpose of the solenoid valve is to override the pilot valve thus causing the main valve to shut off. It
can be controlled by any device capable of interrupting the supply of current to the solenoid coil such as a
thermostat, pressure switch hand clock.
The solenoid is arranged to open the valve when the coil is energised so that whatever switching device is
used it must be arranged to break the current to close the main valve. In this way the unit will always 'fail-
safe' i.e. will close the main valve in the event of a failure in electrical supply.
Electrical supply
It is important that the solenoid is connected to the correct voltage. The standard unit is suitable for
110 Vac or 230/250 Vac 50 Hz supply, but units for other ac voltages may be supplied to special order,
therefore always check on the supply details which are stamped on the solenoid valve name-plate before
attempting to connect up.
Electrical connection is by cable plug to DIN 43650. Remember that the valve is on a steam supply line and
in use will get hot. All wiring, connectors, etc. in close proximity to the valve should therefore be of heat
resisting type.
Earth
The solenoid valve should be adequately earthed.
Maximum pressure
When converted to the 37DE by the addition of the solenoid valve, the Spirax Sarco temperature control is
limited to a maximum pressure of 9.6 bar (139 psi).
2. General product information