AERCO SWDW68 U-Tube Double-Wall Heaters w/ECS - Manual (Page 41)

HE-
111 − SCHEDULED MAINTENANCE
Rev B Mar 2013 6-3
6.5 SEMI-ANNUAL MAINTENANCE
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Actuator
Refer to Section 4.2 and perform the Actuator adjustment procedure presented there. Verify that
the Actuator strokes the Control Valve from the fully closed to the fully open position.
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Temperature Controller
Check the Temperature Controller operation at least every 6 months. Make any necessary
adjustments per Section 5.3, steps 7 through 11.
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Steam Strainer
Clean the strainer in the Steam Input line in accordance with the instructions furnished with the
strainer.
6.6 ANNUAL MAINTENANCE
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Temperature Sensors
AERCO recommends that you check the temperature sensors once a year to ensure that there is
no scale build-up or clogging that may degrade system operation. To check the temperature
sensors, proceed as follows:
1. Close the upstream and downstream water supply valves to the heat exchanger.
2. Check the DHW Outlet Temperature Sensor at the Hot Water Output port. If necessary, clean it using
the following procedure:
a. Disconnect and remove the DHW Outlet Temperature Sensor (dual thermocouples).
b. Inspect for evidence of scale buildup on the stainless steel sleeve.
c. If necessary, clean the thermocouples using a wire brush.
3. After cleaning, reinstall both thermocouples and ensure they are tightened securely.
4. Open all valves that were closed in Step 1 and restore the heat exchanger to operation.
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Recirculation Pump
The recirculation pump is located in the recirculation line, just above the Cold Water Input.
1. Turn the power switch on the Control Box to OFF.
2. Ensure that the water has been drained from the unit (see 6.4.1, steps 1-4).
WARNING
BEFORE PERFORMING THE FOLLOWING STEPS, ENSURE THAT
THE POWER SWITCH ON THE SIDE OF THE ECS CONTROL BOX IS
OFF AND THE HEATER HAS BEEN DRAINED AS SPECIFIED IN
6.4.1, STEPS 1 THROUGH 4.
3. Locate the recirculation pump and disconnect the flanges from the recirculation piping.
4. Without pulling on the electrical conduit attached to the recirculation pump, carefully slide it out and
inspect it.