ECS & CXT-E Control Valve Retrofit for SW Double Wall Heaters
Technical Instruction Document
TID-0140_0A
12/30/2014
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
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Phone: 800-526-0288
Page 16 of 58
2.7
CONTROL BOX REMOVAL
The existing Control Box (Figure 2-1) is secured to the Heat Exchanger using a special mounting
bracket or two weld studs attached directly to the shell.
1. Check to ensure that the external power source has been turned off.
2. Disconnect all power supply wiring to the Control Box.
3. Disconnect all wiring between the Control Box and any external Solenoid Valves.
4. If a Pneumatic Control Valve Actuator is currently installed on the Heater, disconnect the air
supply and control air tubing from the Control Box.
5. Disconnect the Pressure Gauge compression fittings.
6. Cut all wire ties leading to the Control Box. Do not cut the thermal element.
If you have the mounting bracket, proceed as follows:
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. Loosen, but do not remove, the hex nut securing the Control Box Mounting Bracket to the
Top Head stud (Figure 2-8).
2. To remove the Control Box from the Water Heater.
(a) 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 2-9).
(b) Remove the Rear Mounting Panel from the Control Box to access the two screws
securing the Box to the Mounting Bracket and set the Control Box aside.
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.
If you have the weld studs proceed as follows. Note that the new box will be mounted directly on
the studs.
1. Remove nuts.
2. Remove box.