AERCO Electronic Controls System (ECS) - Manual (Page 62)

Electronic Control System (ECS) and Type CXT-E Valve
9. RECOMMENDED SPARE PARTS
Page 62 of 82
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288 VD2: 02/28/14
OMM-0003_0D AC-105
• Temperature Indicators (Water-to-Water Heat Exchangers Only)
• DC Power Supply
• DC Voltage Regulator
The following paragraphs reference Figures in previous Sections as well as Figures in this
Section. Refer to the applicable Figures as necessary when performing the replacement
procedures which follow.
8.3.2 Control Box Assembly Replacement
If necessary, the complete ECS Control Box Assembly can be removed and replaced as
follows:
1) Loosen the captive screws on the Control Box door and the recessed panel (Figures 2-3, 2-
4).
2) Open the swing-down recessed panel. Locate and disconnect the Line, Neutral and Ground
leads connected to Terminal Block TB-2 on the bottom interior surface of the Control Box
chassis (Figure 2-5).
3) Refer to Figures 1-1 and 1-2 and disconnect the Control Box cables from the following
devices:
a) Disconnect the ACTUATOR cable (3-pin Molex connector) from the Control Valve
Actuator.
b) Disconnect the FLOW SENSOR cable (5-pin Molex connector) from the Flow Sensor
mounted at the cold water inlet of the Heat Exchanger.
c) Disconnect the OUTLET TEMP cable (4-pin Molex connector) from the Outlet
Temperature Dual Sensor installed in the Water Heater outlet port.
d) Disconnect the SOLENOID cable (3-pin DIN connector) from the Over-Temperature
Solenoid on the top of the Heat Exchanger.
e) For Water-to-Water Heat Exchangers ONLY, disconnect BOILER TC IN and TC
OUT leads (2-pin Molex connectors) connected to the heating fluid (boiler water) inlet
and outlet Temperature Sensors.
4) After all Control Box cables have been disconnected, remove the two hex nuts securing the
top and bottom mounting attachments of the Control Box to the Heat Exchanger.
Completely remove the Control Box from the Heat Exchanger.
5) Control Box replacement is accomplished by simply reversing the previous steps.
8.3.3 Temperature Controller Replacement
The Temperature Controller is located on the recessed panel behind the Control Box door as
shown in Figure 3-2. Removal and replacement is accomplished as follows:
1) Open the Control Box door to access the Temperature Controller.
2) The Temperature Controller is installed in a sleeve as shown in Figure 8-7. To unplug and
remove the Controller from its sleeve, simply pry the latching ears outward and pull the
Controller out of the panel.
3) To install a replacement Temperature Controller, simply slide it into the front panel sleeve
until the latching ears click into place. Following replacement, adjust the setpoint
temperature to the required value using the Adjustment procedures in Section 3.