AERCO SWDW68 U-Tube Double-Wall Heaters w/ECS - Manual (Page 37)

HE-
111 − OPERATION
Rev B Mar 2013 5-3
mode, the upper display will continue to show the heat exchanger Hot Water Output water
temperature, and the lower display will show the selected setpoint temperature.
14. In the AUTO mode, the ECS will stabilize at the selected setpoint temperature. When stabilized, the
ECS is set for unattended operation and no further operator intervention is required.
15. Close the Hot Water faucets or valves that were opened in step 7.
5.4 SHUTTING DOWN AND DRAINING THE HEAT EXCHANGER
To shut down the heat exchanger:
1. Set the Eurotherm to the MAN(ual) in the 0% Valve position.
2. Close all stop valves in the Steam Input and Condensate Output lines.
3. IN THIS ORDER, close the stop valves in the:
a. Hot Water Output line
b. Recirculation line
c. Cold Water Input line
When the heat exchange has been shut down according to steps 1 and 2, drain the heat exchanger as
follows:
4. CAREFULLY open the relief valve in the heat exchanger upper head assembly to relieve pressure in
the heat exchanger shell. If water continues to flow from the relief valve, one of the cold water stop
valves is either leaking or is not shut tightly. Stop the flow from the relief valve and proceed.
5. Holding the relief valve open (to prevent creating a vacuum in the shell), open the plugged drain at
the bottom of the heater exchanger shell and drain the heat exchanger completely.