AERCO CXT-E Retrofit Kit - Manual (Page 49)

ECS and CXT-E Retrofit Instructions Kit # 27004-TAB
Technical Instruction Document TID-0141_0A
12/30/2014 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288 Page 49 of 76
4.5.1 Helitherm Steam-to-Water Units
For Helitherm Steam-to-Water units, refer to Figure 4-11 which shows a typical B-Plus Heater.
Proceed as follows:
1. Remove the Compound Pressure Gauge (8356-[ ]), Pig Tail (8-20) and 1/4” Coupling (9-3)
from the Retrofit Kit.
2. Install the Pig Tail in the tapped hole downstream of the CXT-E Control Valve.
3. Attach the 1/4” NPT Coupling and Pressure Gauge to the Pig Tail as shown in Figure 4-11.
Tighten all connections.
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 4-12. However, for Water-to-Water Double-Wall Models, the Cold
Water Inlet is located on the Shell of the Heater, as shown in Figure 4-13.
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.
COLD WATER
INLET
FLOW
METER
ORIFICE
DISC
SPRING
RING
BOTTOM VIEW
Figure 4-12. Cold Water Inlet Orifice Location – Typical Helitherm Heater