AERCO SWDW68 U-Tube Double-Wall Heaters w/ECS - Manual (Page 69)

HE-
111 − CORRECTIVE MAINTENANCE
Rev B Mar 2013
8-15
IMPORTANT
FOR PROPER OPERATION OF THE CONTROL VALVE, IT IS IMPERATIVE THAT YOU USE
THE CORRECT ADAPTER AND PIN LOCATION FOR THE VALVE SIZE BEING REPAIRED.
The linkage assembly is attached to the Control Valve top with two cap screws. Be sure to replace the
linkage gasket (Part No. 81046) each time you install a new linkage assembly.
ADAPTER
PART NO. 24038-1
(FOR 1 TO 3 IN. VALVES)
USE THIS PIN
LOCATION FOR
4 IN. VALVES
USE THIS PIN
LOCATION FOR
1 - 2 IN. VALVES
ADAPTER
PART NO. 24038-2
(FOR 4 IN. VALVE ONLY)
13 - 3/8 IN.
4–1/2 IN. x
1-15/16 IN. WIDE
USE THIS PIN
LOCATION FOR
2 -1/2 & 3 IN.
VALVES
INDICATOR
PLATE
INDICATOR
PLATE
Figure 8-6. Linkage Assemblies
Use the following procedure when you need to remove and replace the linkage assembly:
58. Remove the Actuator per steps 46 through 49.
59. Refer to Figure 8-1 (for 1 to 2-inch Valves) or Figure 8-2 (for 2 ½ to 4-inch Valves) to locate the items
identified in parentheses in the following steps.
60. Rotate (loosen) the hex nuts (17) under the indicator plate approximately one half-turn clockwise.
61. Disconnect the linkage adapter from the Valve shaft (16) by turning the shaft clockwise (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 disengages the linkage adapter threads.
62. Remove the indicator plate from the Valve shaft (16).
63. Remove the two cap screws (19) securing the linkage assembly (26) to the Valve top (21).
64. Remove the linkage assembly (26) from the Valve top. Also, remove the gasket (29) (which will not
be retained).