AEC TCU Series Open Reservoir Water Temperature Control Units - Manual (Page 28)

Open Resevoir Water Temperature Control Units Page 29
4 Identifying Controls and Features
4-1 Identifying Mechanical Controls and Features
To and From Process Probes
One (1) Type-K Thermocouple is included with your TCU temperature control unit. One is
located downstream from the heater to sense To Process temperature.
Safety Thermostat
The safety thermostat mounted on the side of the heater tank protects against thermal
runaway. The thermostat guards against the unlikely event of “runaway” heating. If
overheating occurs, the safety thermostat shuts down heater outputs. The unit continues to
pump water through the system to prevent heater damage. ACS Group recommends that you
install an audible or visual alarm to the terminals provided. Factory installed alarms are
available; see the electrical schematics in Your Information Packet for more information.
Pressure Relief Valve
If the combined pressure of the cooling supply water and pump discharge exceeds 150 psig
(1,034.25 kPa/10.34 bars), the pressure relief valve opens and relieves the pressure. This is a
non-adjustable ASME construction valve with a stainless steel spring.
Route a pipe from the pressure relief valve
to a suitable drain to reduce potential scalding hazard.
The drain line must not have any restrictions or back pressure.