ECS & CXT-E Control Valve Retrofit for SW Double Wall Heaters
Technical Instruction Document
TID-0140_0A
12/30/2014
AERCO International, Inc.
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100 Oritani Dr.
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Blauvelt, New York 10913
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Phone: 800-526-0288
Page 13 of 58
Self-Contained Control Valve Actuator Removal
Refer to Figure 2-5 and remove the Self-Contained Valve Actuator as follows:
1. Loosen the locknut on the thermal element adjustment sleeve. Unscrew the adjustment
sleeve to remove the sleeve and thermal element from the Actuator.
2. Carefully loosen the compression fittings on the upstream and downstream tubing to relieve
any trapped pressure buildup. Completely remove both the upstream and downstream
tubing assemblies and compression fittings. The tapped NPT ports in the Valve Body will be
plugged during the replacement procedures in Section 3.
3. Remove the hex head cap screws securing the Actuator to the Valve Body. Valve sizes
from 1” to 2” have 6 cap screws, while sizes 2 ½” to 4” Valves have 8 cap screws.
CAUTION
Use care when performing step 4 to avoid damaging or scratching internal
Valve Body parts. It is imperative that the Actuator be lifted straight up to
avoid sticking or binding.
4. Lift the Actuator Housing straight up and off the Valve Body. Doing so will also remove the
entire inner valve assembly (Figure 2-7), including the Valve Stem, Seat, Valve Plug Shaft
and Top/Bottom Pistons. Depending on the age and condition of the valve, considerable
force may be required to pull the Pistons through the Valve Body. If it cannot be removed,
the Valve Stem may be used as an impact hammer to remove scale build-up on the internal
valve surfaces and allow Piston removal.
Replacement parts for these removed items are provided in the applicable Retrofit Kit for the
Valve size being retrofitted. These items will be replaced in Section 3. The Retrofit Kit also
contains a new Lower Shaft, Valve Top/Gasket, plus additional replacement items for the
Valve being retrofitted.
5. Proceed as follows, depending on the size of the Valve being retrofitted:
(a) For 2 ½ to 4 inch Valves, separate the Valve Seat Retaining Disc from the Valve Seat
by removing the four (4) cap screws (Figure 2-6).
(b) For 1 to 2 inch Valves, hold the Valve Plug Shaft with a pair of pliers and remove the
Valve Stem Retaining Nut from the Shaft (Figure 2-7).
6. Insert a 1/8 inch steel rod through the hole near the top of the Valve Stem (Figure 2-6 or 2-
7).
NOTE
If “flats” are provided on the Actuator Connecting Shaft and Valve Stem,
open-end wrenches may be used in step 7 to disconnect the Valve Stem
and Actuator Shaft.
7. Grasp the Actuator Connecting Shaft (Figure 2-6 or 2-7) with a pair of pliers. Carefully turn
the Valve Stem counterclockwise and separate it from the Actuator Connecting Shaft.
8. Replacement of all required Valve parts will be accomplished using the appropriate
instructions and illustrations in Section 3.
