Pressure Relief Valve - Thermo Scientific ThermoFlex Manual De Instrucciones

P 1 P 2 T 0 T 1 Pump

Pressure Relief Valve

(Internal Configuration)
CAUTION
Thermo Scientific
The pressure relief valve, located on the top
left rear of the chiller, is used to set the desired
system back pressure to your application. The
valve is factory preset to 80 ± 5 psi (5.5 ± 0.4
bar ).
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 prime, then close the valve.
SETPOINT
+24.2°C
Pressure: 80.0psi
Figure 5-5 Pressure Status Display
Use the Status Display to display P 1, it should display 80 ± 5 psi.
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 32 psi (2.2 bar) for a P 2 pump, and 8 psi (0.6 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.
Do not exceed 100 psi (6.9 bar).
When complete, inspect the area around the
fluid is present, slightly tighten the nut and reinspect.
Note Should the chiller start to vibrate the valve setting may be the cause.
Changing the pressure setting ± 5 psi (0.3 bar) will eliminate the vibration.
Packing Nut
Figure 5-4 Nut and Screw
MENU
In

/ " packing nut for fluid. If
5
8
Section 5
Adjusting Screw
PSI/KPa
- +


ThermoFlex 5-3