Fluke 7008 User Manual page 66

7008
Users Guide
The "F4" command controls the back pressure valve. When the valve is closed
the cooling capacity will be significantly reduced. This valve should normally be
left open throughout the operating range of the bath. Table 6 summarizes the
control functions for heating and cooling. Table 7 shows the recommended
control settings for each operating temperature range. The ranges may need to
be adjusted depending on the bath and its particular use.
Heater
Refrigeration
Expansion valve
Back pressure
–10 to 15°C
15 to 40°C
40 to 110°C
10-8
Table 6. Serial Power Control Functions
Function Command
F1
F2
F3
F4
Table 7. Temperature Range Control Functions
Range Heater
low
low
low
0
low high
off on
open closed
open closed
Refr.
on
on
off
1
Expans.
open
closed
closed