AERCO SWDW68 U-Tube Double-Wall Heaters w/ECS - Manual (Page 27)

HE–
111 − FUNCTIONAL DESCRIPTION
Rev B Mar 2013 3-7
3.3.4.4 Over-temperature Solenoid Valve
The Over-temperature Solenoid Valve is operated by the Over-temperature Switch in the Control Box.
When the preset high temperature limit is exceeded at the Hot Water Output, The DHW Outlet Dual
Temperature Sensor signals the Over-temperature Switch, energizing the Solenoid Valve and relieving
the temperature build-up in the heat exchanger.
3.3.4.5 Electronic CXT-E Control Valve Actuator
The Electronic CXT-E Actuator operates the CXT-E Control Valve, as discussed in 3.2.3.4. Control
Valves are available in pipe sizes ranging from 1 inch to 4 inches. Figure 3-7 identifies the basic
dimensions for each size Electronic CXT-E Control Valve. The CXT-E Actuator is identical for each size
valve. The linkage assemblies used with each size valve body are nearly identical, except for minor
differences in the shaft adapter stroke of the mechanical linkage.