Table 5 Temperature Range Control Functions; Table 6 Serial Power Control Functions - Fluke 7009 User Manual

expansion valve is closed. This should be adjusted for approximately 56 psi.
when the valve is closed.

Table 6 Serial Power Control Functions

Function Command
Heater F1
Refrigeration F2
Expansion valve F3
Back pressure F4
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 5 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.

Table 5 Temperature Range Control Functions

Range
–10 to 15°C
15 to 40°C
40 to 110°C
0
low
off
open
open
Heater Refr.
low on
low on
low off
Digital Communication Interface
1
high
on
closed
closed
Expans.
open
closed
closed
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