Side Panel; Figure 3 Side Panel Controls - Fluke 7009 User Manual

User's Guide
7.2
18
(5) The heater power switch is used to select the appropriate heater power lev-
els for heating and controlling the bath at various temperatures.
(6) The cooling power switch controls power to the cooling compressor and
cooling fan.
NOTE: Be sure the "Cooling Power Switch" (see Figure 2) is in the
"OFF" (0) position when the unit is turned ON. Repeatedly turning the
unit on with the "Cooling Power Switch" in the "ON" position may dam-
age the System Fuse.

Side Panel

The side panel has three features (see Figure 3): 1) the BACK PRESSURE
valve, 2) the COOLING TEMPERATURE regulating valve, and 3) the COOL-
ING TEMP gauge. With the interface option an extra cooling valve (HIGH) is
provided.
1) The BACK PRESSURE valve adjustment is used to control the amount
of cooling supplied to the system. This valve reduces the cooling capac-
ity by restricting the flow of refrigerant to the bath, allowing the adjust-
ment of the heating to cooling percentage. Under normal operation the
valve should be fully open (counter clockwise).
2) The COOLING TEMPERATURE regulating valve is used to adjust the
temperature at which the refrigerant evaporates, which determines cool-
ing efficiency. The ideal temperature for operation is about 5-10 degrees
Celsius below the desired bath temperature. Refer to label below gauge
for approximate psi and evaporative temperature settings. The table from
the label is reproduced below.
Back Pressure
1

Figure 3 Side panel controls

Cooling
Temperature
Low High
2
3