5•Service
Doc. 065215-02 9/09 77
4. Install the new sample loop between the two ports.
5. Make sure the loop is tightly coiled, so that the door can close securely.
6. Turn on the pump from the ICS-900 Control panel.
7. Check for leaking fittings and tighten if required.
8. Close the door.
5.6 Cleaning and Replacing Pump Check Valves
A dirty check valve causes erratic flow rates and pressures. In addition, it may
cause the pump to lose prime and/or be difficult to reprime. If possible, replace
dirty check valves. If new check valves are not available, follow the instructions
for cleaning.
To replace the check valves:
1. Turn off the ICS-900 power switch and disconnect the power cord.
2. To prevent contamination of pump parts, put on a pair of powder-free gloves
before disassembling the pump head.
3. Disconnect the tube fittings from the inlet and outlet check valve assemblies
on the primary pump head (see Figure 5-7
).
4. Use a 1/2-inch wrench to loosen both check valve assemblies. Remove the
check valve assemblies from the pump head.
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