AERCO ECS Retrofit - Manual (Page 49)

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4.6 Installation of New Orifice Disc
The Retrofit Kit contains a new Orifice Disc (part no. 49032-[ ]) sized for the applicable follow range
used by the Heater being retrofitted. The Orifice Disc is located in the Cold Water Inlet on the Water
Heater. For Helitherm Heater Models, the Cold Water Inlet is on the Bottom Head of the Heater as
shown in Figure 4-13. However, for Double-Wall Models, the Cold Water Inlet is located on the Shell
of the Heater as shown in Figure 4-14.
Refer to the applicable Figure for the unit being modified and install the new Orifice Disc and Spring
Ring as follows:
1. Obtain the Orifice Disc and Spring Ring from the Retrofit Kit.
2. Insert the Orifice Disc fully into the Cold Water Inlet until it contacts the stops. Ensure that the
Orifice is seated evenly in the Inlet.
3. Using a pair of needle-nose pliers, compress the ends of the Spring Ring and insert it fully into
place.
4. This completes the installation of the new Orifice Disc.
Figure 4-13. Cold Water Inlet Orifice Location – Typical Helitherm Heater