Forma Scientific 3158 - Replacing Solenoid and Temperature Control

Forma Scientific, Inc.
7-11
4. Remove the two mounting screws which secure the triac.
5. Carefully disconnect the wires to the triac and note their connections.
6. Remove the triac from the unit. Note the thermal compound between the
base of the triac and the floor of the control panel housing. If necessary,
reapply more thermal compound before installing the new triac.
7. Install the new triac by reversing the above procedure.
7.7 REPLACING THE CO
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SOLENOID
(REFER TO WIRING DIAGRAM, 140181-71-0-D)
1. Loosen the two 1/4-turn fasteners on the front of the control panel and pull
the panel out.
2. Locate the CO
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solenoid and disconnect the tygon tubing attached to it.
Note how tubing is installed so that it can be attached to new solenoid in
same way.
3. Remove the screws that hold the solenoid in place.
4. Disconnect the wiring to the solenoid, making note of the connections.
5. Remove the solenoid and install the new unit by reversing the above
procedure. Note the flow direction marked on solenoid.
7.8 REPLACING THE TEMPERATURE CONTROL
(Refer to Wiring Diagram, 140181-71-0-D)
1. Loosen the two 1/4-turn fasteners on the front of the control panel and pull
the panel out.
2. Remove the temperature control knob by loosening the two Allen head
screws recessed in the knob.
3. Remove the nut on the shaft on the outside of the panel, then remove the nut
on the back of the panel behind the control knob.
4. Remove the wiring to the temperature control and note the connections.
5. Remove the control and replace the new unit by reversing the above
procedure.