7008
Users Guide
10-8
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.
Table 6. Serial Power Control Functions
Function Command 0 1
Heater F1 low high
Refrigeration F2 off on
Expansion valve F3 open closed
Back pressure F4 open closed
Table 7. Temperature Range Control Functions
Range Heater Refr. Expans.
–10 to 15°C low on open
15 to 40°C low on closed
40 to 110°C low off closed
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