94 708-DS / 709-DS Operator’s Manual
4 Operating the 708-DS / 709-DS
 
Diagnostics - DVH Diagnostics Screen 2
The DVH screen displays a button for each vessel position. If Test 
Single Vessel Lower heater was selected on the previous screen, press a 
button to turn on the lower heater for a vessel. If Test Single Vessel Both 
heaters was selected on the previous screen, press a button to turn on 
both heaters. When a heater is active, a green check mark displays in the 
corresponding vessel button. Once the heaters are turned on, the value 
of the RTD starts to increase as the temperature rises.
From the DVH screen:
• Press Ok to return to the main DVH Diagnostics screen.
For safety reasons, the heaters are only provided with 15% of maximum 
power.