ECS Upgrade for SW Double Wall Heaters, Kits 27035, 27036, 27037
Technical Instruction Document
TID-0142_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 8 of 24
2.4 Removal of Items Connected to Heater Shell
In order to install several new ECS components, the Flow Sensor and associated fittings/tubing
and the Cold Water Inlet Orifice Disc must be removed. Proceed as follows:
1. Disconnect any external piping connected to the Cold Water Inlet.
2. Disconnect the Flow Sensor and associated fittings/tubing and discard.
3. Take the ¼” NPT hex plug (9-22) from the kit and plug the side of the drain valve where
the Flow Sensor tubing was located.
4. Locate the Orifice Disc in the Cold Water Inlet.
5. Using a pair of pliers, disconnect the snap ring securing the Disc in the Inlet Nozzle.
6. Remove the clip and the Orifice Disc from the Inlet Nozzle and discard.
2.5 Installation of ECS Components on Top Head Assembly
The ECS components to be installed on the Top Head Assembly include:
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Cold Water Inlet
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Thermocouple and Circulator Installation
Note that brazing is preferred method of assembling P/N 970049. However, if a burn permit or
brazing equipment is not available, then compression fittings are acceptable. See sections 2.5.1
and 2.5.2.
2.5.1 Thermocouple & Circulator Installation For SWDW Heaters – Brazed Fittings
NOTE: This is the preferred method if a burn permit is available.
Use Loctite™ 565 or equivalent on all threaded potable water fittings. Loctite 567 may also be
used. Refer to Figure 2-3 for proper positioning.
1. Obtain the following from the upgrade kit:
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2” union (93326)
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2” Nipple (90074)
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3”/2” Reducing coupling (93325) x 2
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3” Tee for Cold Water Inlet (22102) x1
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1.5” x 7” Nipple (90058)
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1.5” Flange w/ 2 3/8” x 16 bolts and nuts (59095) set hardware aside for use in Step 17.
2. Attach 2” Union to the Cold Water Inlet (Figure 2-2).
