AERCO ECS Retrofit - Manual (Page 12)

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2.5 Control Valve Actuator Removal
The Water Heater may currently be equipped with a Pneumatic, Self-Contained or Electro-Hydraulic
Control Valve Actuator. Therefore, refer to the appropriate paragraph for the type of Control Valve
Actuator currently installed.
NOTE
Following removal of the existing Control Valve Actuator, AERCO recom-
mends that the Valve Seat and Packing be replaced using the appropriate
items included with the Retrofit Kit. If the Valve is relatively new (less than 1
year) and is currently equipped with a Pneumatic or Electro-Hydraulic
Actuator, replacement of these items may be omitted at the discretion of the
user. However, if the Valve is currently equipped with a Self-Contained
Actuator, replacement of these items is mandatory, since the Valve must be
virtually disassembled to remove the installed Actuator. A new Valve Top (plus
other items) must also be added to Self-Contained Valves before an ECS
Actuator and Linkage Assembly can be installed.
2.5.1 Pneumatic Control Valve Actuator Removal
Refer to Figure 2-4 and remove the Pneumatic Control Valve Actuator as follows:
1. Disconnect the compression fitting connecting the control air line from the Actuator Top.
2. Loosen the hex nut under the indicator disk.
3. Insert a 1/8 inch steel rod in the hole provided in the upper shaft. Hold the rod to keep the
upper shaft from turning when performing the next step.
4. Using a pair of pliers, grasp the lower shaft and rotate it counterclockwise to separate it from
the upper shaft. Use care to avoid scratching the lower shaft.
5. Remove the two 3/8-16 cap screws securing the Pneumatic Actuator to the Valve Body.
Remove the entire Actuator from the Valve.