the heater is ON. When the indicator is green the heater is OFF and the bath is
cooling.
(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.
7.2
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 cooling 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 capacity
by restricting the flow of refrigerant to the bath, allowing the adjustment
of the heating to cooling percentage. Under normal operation the valve
should be fully open (counter clockwise).
7012 Calibration Bath
User’s Guide
22
Figure 3
Refrigeration Controls - Side Panel
