AERCO CXT-E Retrofit Kit - Manual (Page 21)

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 21 of 76
2.6 CONTROL BOX REMOVAL
The existing Control Box (Figure 2-1) is secured to the Heat Exchanger using a special mounting
bracket. The top end of this mounting bracket contains a slotted cutout which is inserted around
one of the studs securing the top head to the shell flange. A hex nut secures the bracket in place.
The currently installed Control Box will no longer be used. However, the mounting bracket will be
reused to mount the new ECS Control Box. Remove the Control Box and mounting bracket
assemblies as follows:
1. Check to ensure that the external power source has been turned off.
2. Disconnect all power supply wiring to the Control Box. Also, disconnect all wiring between
the Control Box and any external Solenoid Valves.
3. If a Pneumatic Control Valve Actuator is currently installed on the Heater, disconnect the air
supply and control air tubing from the Control Box.
4. Disconnect the Pressure Gauge compression fittings.
5. Cut all wire ties leading to the Control Box. Do not cut the thermal element.
6. Loosen, but do not remove, the hex nut securing the Control Box Mounting Bracket to the
Top Head stud (Figure 2-9).
7. Completely remove the Control Box and Mounting Bracket from the Water Heater.
8. Open the Control Box door. From the rear of the Control Box, remove the six 8-32 screws
securing the Rear Mounting Panel to the enclosure (Figure 2-10).
9. Remove the Rear Mounting Panel from the Control Box to access the two screws securing
the Mounting Bracket to the Box
IMPORTANT
Save the Control Box Mounting Bracket when it is removed from the
Control Box. This Mounting Bracket will be used to install the new ECS
Control Box.
10. Remove the two screws securing the Mounting Bracket to the Control Box. Separate the
Control Box and Mounting Bracket. This Control Box will no longer be used and can be
discarded. However, the Mounting Bracket will be reused to attach the new ECS Control
Box to the Heater in Section 4.