Thermo Scientific ThermoFlex Manual De Instrucciones página 141

Section 5
The pressure relief valve is used to set the desired
P 1 P 2 T 0 T 1 Pump
system back pressure (P1) to your application. The
Pressure Relief Valve
valve is factory preset to 80 ± 5 psi (5.5 ± 0.4 bar).
(External Configuration)
Adjusting Screw
The valve's inlet/outlet
Packing Nut
connections are ½"FNPT.
If the chiller is not plumbed to an application, set the
pressure by installing a loop of hose equipped
with a shut-off valve between the supply and
return fittings. Start the chiller and allow it to
Figure 5-6 Nut and Screw
prime, then close the valve.
Use the Status Display to display P 1, it should display 80 ± 5 psi.
SETPOINT MENU
In
+24.2°C
Pressure: 80.0psi
Figure 5-7 Pressure Status Display
Use a screwdriver to turn the adjusting screw (counterclockwise to reduce
pressure) until the controller displays the desired setting.
Note Due to internal back pressure, the minimum pressure setting for a
deadheaded pump is 40 psi (2.8 bar) for a P 2 pump, and 22 psi (1.5 bar) for
a P 1 (these settings prohibit external flow from the chiller).

If the chiller is plumbed to an application, ensure the chiller is off. Then back out
the adjusting screw counterclockwise to reduce pressure. Turn the chiller
on. Ensure that there is back pressure in the system. Turn the adjusting
screw until the controller displays the desired setting.
CAUTION
Do not exceed 100 psi (6.9 bar).

When complete, inspect the area around the / " packing nut for fluid. If
5
8
fluid is present, slightly tighten the nut and reinspect.
5-4 ThermoFlex
Thermo Scientific