Land 4500 MKII Premier, Руководство по эксплуатации и обслуживанию

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Model 4500 Premier Dust and Opacity Monitor Appendix
138
Appendix B Low Temperature Termination Box
AppB-1 Termination Box Heater Unit
Brief Description
A 40W heater pad is pre-wired behind the PCB and controlled via a thermostat switch located on the
underside of the main PCB. When the temperature inside the Termination Box drops below a preset
value on the thermostat switch, the heater pad is activated. It is deactivated when the temperature
returns to the preset value, and so a constant operating temperature is maintained. The thermostat
switch is factory set to 0°C (32°F) and should require no further alteration.
Electrical Designation
The Termination Box is fitted with an additional set of connectors when specified with the heater
package. The additional connectors are labelled A, B, C and D, and are fitted to the left of the main
rail. The Termination Box is suitable for both 110 V and 230 V mains power. The power supply
terminals are clearly marked with a label marked 'Heater'.
NOTE: THE UNIT IS FACTORY SET TO 230 V AND NO ADJUSTMENT IS NECESSARY
Setting the Heater unit to accept 110 V mains supply
1. Ensure that the mains power supply is disconnected before proceeding.
2. Release the screws in terminals B and C.
3. Remove the two short (pre-fitted) cable links from their respective connectors.
4. Using the label for guidance, re-fit the cable links as indicated. One for each pair of connectors:
A and B
C and D
5. No further adjustment is necessary. Re-apply mains power supply.
1.1 Thermostatically Controlled Heated Local Control Unit
A B C D
HEATER
115V
230V
!