AERCO CXT-E Retrofit Kit - Manual (Page 43)

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 43 of 76
COLD
WATER
INLET DRAIN
PORT
TEE
3/4" CLOSE
NIPPLE
DO NOT
LEAK DETECTION PORT
PLUG OR OBSTRUCT !
EXCHANGER CONSTRUCTED WITH THIS IS A VENTED U - TUBE HEAT
AN INNER OR OUTER TUBE
FAILURE IS INDICATED BY DOUBLE WALL TUBE.
FRONT
SIDE
Figure 4-7. Water-to-Water Double-Wall Heater Flow Meter Location
4.3.1 Flow Meter Installation For Helitherm Heaters
For A-Plus, B-Plus, B-Plus II and E-Plus Heaters, the Flow Meter connections are made at the
Bottom Head of the Heater. The Flow Meter Inlet side connects to the Cold Water Inlet using
Rigid Tubing. However, the Outlet side of the Flow Meter connects to the Drain Outlet using
Flexible Tubing. A typical B-Plus or B-Plus II installation is shown in Figures 4-5 and 4-6. Refer to
these Figures when performing the following steps:
1. Obtain the Flow Meter, Rigid Inlet Tube, Flexible Outlet Tube and Compression Fittings
from the Retrofit Kit. Refer to Appendix A for the applicable part numbers for the tubing and
fittings required for the unit being retrofitted.
2. Attach the Rigid Inlet Tube and Flexible Outlet Tube to the Flow Meter using the fittings
provided in the kit.
3. Next, obtain the Modified 2” NPT Nipple (9006) from the Retrofit Kit.
4. Remove the existing 2’ NPT Nipple from the Drain Outlet on the Bottom Head.
5. Install the new Modified 2” NPT Nipple in the Bottom Head. Attach the ¼ NPT coupling to
the tapped hole in the Modified Nipple.
6. Connect the Flow Meter Outlet Flexible Hose to the Modified Nipple on the Drain Outlet
using the compression fitting. Connect the Rigid Flow Meter Inlet Tube to the Cold Water
Inlet using the compression fitting provided in the kit.
7. Position the Flow Meter so that the Paddle Wheel is in the “Vertical” plane as shown in
Figure 4-8. Tighten all Flow Meter connection fittings.