AERCO SWDW68 U-Tube Double-Wall Heaters w/ECS - Manual (Page 66)

HE-
111 − CORRECTIVE MAINTENANCE
Rev B Mar 2013 8-12
37. Referring to Figure 8-1 or Figure 8-2, reassemble the following parts in the order indicated:
a. NEW Valve top gasket (13)
b. Valve top (21)
c. Cap screws or hex-head bolts (14):
• For valve sizes 2-1/2” to 4” use 1/2-13 cap screws
• For valve sizes 1” to 2” use 3/8-16 hex-head bolts
Tighten the cap screws using an alternating pattern to provide a uniform seal and prevent Valve
leakage.
d. NEW packing assembly (20)
e. Packing nut (18)
f. Hex nuts (17)
g. Indicator plate (See Figure 8-1 or Figure 8-2)
38. Replace the Actuator (27), linkage (26) and gasket (29) onto the Valve top (21) and secure with cap
screws (19).
39. Position the hex nuts (17) in the original location noted during the removal process (Step 7).
40. Install the indicator plate on the Valve shaft (16) with the curved end facing upward (Figure 8-6).
41. 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.
42. Press down on the Valve shaft (16) to compress the pilot spring (10) in the Valve body.
43. 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.
44. If the Valve had been removed from the steam line, replace it and reconnect the electrical connector
plug to the Actuator.
45. Before placing the Valve back into service, adjust the CXT-E Actuator according to Section 4.2.