Temperature Control Units : MFC with G Series Instrument
Page: 58
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14. Remove the 4 mounting screws. The top plate, mounting bolts, valve
assembly and the mounting plate with the attached micro-switch will
now be loose. Carefully separate the valve from the motor/gearbox.
15. At this step, the valve can be rebuilt or replaced. To rebuild the valve,
order PN 8764939, and install new stem packing O-ring, seal rings,
and seats (see diagram below). Once the value is back together,
continue with step 17:
16. Aligned the valve assembly coupling to the motor/gearbox and place
on the cooling cylinder. A gasket or seal is not required.
17. Replace the top plate, the micro switch mounting plate and the
4 mounting bolts. Tighten the 4 mounting bolts alternating to the
opposite bolts.
18. Once power is reapplied, the instrument will align the AVT
TM
modulating valve to “home base”. Home base is the reference point
from which the controller is able to open the valve incrementally.
Process operations can resume. If the unit is not able to nd home, a
valve fault ULU will appear in the temperature display. Readjust the
home switch to clear the fault. Adjust the home switch as needed (as
outlined in Step 11).
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