4identifying controls and features, 1 identifying mechanical controls and features – AEC Econo-Cool Chillers User Manual
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AEC Water Temperature Control Units
Page 27
4
Identifying Controls and Features
4-1 Identifying Mechanical Controls and Features
To Process Thermocouple
A type K ungrounded thermocouple with a 304SS probe is downstream from the heater
to sense 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. We recommend that you
install an audible or visual alarm to the terminals provided. Factory installed alarms are
available; see the electrical schematics 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.
Important!
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.