AERCO Electronic Control Valve - Manual (Page 39)

VA-115 INSTRUCTIONS – ELECTRONIC CONTROL VALVE, CXT-E
8-15
CM62. Remove the two Cap Screws (19) securing the Linkage Assembly (26) to the Valve Top (21).
CM63. Remove the Linkage Assembly (26) from the Valve Top. Also, remove the Gasket (29) which will
be replaced.
CAUTION
Ensure that the replacement Linkage Assembly, Adapter and Scale are identical
to those removed in the previous steps. Also, ensure that the linkage pin (Figure
8-6) is set to the proper position for the Control Valve size. Failure to observe this
precaution may result in improper Control Valve operation.
CM64. Using a new Gasket (29), position the replacement Linkage Assembly on the Valve Top (21).
Secure the Linkage Assembly to the Valve Top using the previously removed Cap Screws (29).
CM65. Install the Indicator Plate on the Valve Shaft (16) with the curved end facing upward (Figure 8-4)
CM66. Attach the Valve Shaft (16) to the Linkage Adapter by rotating the Shaft counterclockwise (as
viewed from above). If the Valve Shaft cannot be turned by hand, use an open-end wrench to turn
the “double-nuts” on the Shaft until it engages the Linkage adapter threads. Insert the Shaft into
the Linkage Adapter until the Hex Nuts (17) are snug against the Indicator Plate.
CM67. Press down on the Valve Shaft (16) to compress the Pilot Spring (10) in the Valve Body.
CM68. With the Pilot Spring compressed, verify that the Indicator Plate is aligned with the “0” (zero)
marking on the Scale (28). If necessary, rotate the Valve Shaft until the Plate is aligned with the
“0” Scale marking.
CM69. Replace the Actuator using steps CM49 through CM56 in the previous paragraph titled
ACTUATOR REPLACEMENT.