Sterling 6017 series installation manual Pressure Switch, Safety Thermostat, Reservoir Tank

Pressure Switch

A pressure switch is built into each unit to guard against heater damage. This feature prevents the heater elements from being energized unless the pump is running and fluid is in the system. After a preset time, the pump shuts down if the fluid pressure is not re-established. The pressure switch is preset at the factory; do not tamper with it.

Safety Thermostat

The safety thermostat is mounted on the side of the heater tank. This is to guard against the unlikely event of “runaway” heating. If overheating does occur, the safety thermostat shuts down the heater outputs and sounds an audible alarm. A red pilot light on the status board also illuminates. The unit continues to pump fluid through the system to prevent heater damage. Auxiliary factory installed alarms such as beacons and klaxons are available as options.

The safety thermostat is a manual reset type. All controller functions are locked out until the red "STOP" button is pushed. It is imperative that a qualified maintenance technician determine and correct the cause of the fault before resuming operation.

Reservoir Tank

A reservoir tank with sight gauge is standard; usable capacity is

•40 gallons (151 liters) on 6017L & 6017M units

•65 gallons (246 liters) on 6017P & 6017V units.

The tank permits thermal expansion of the heat transfer fluid, and provides make-up fluid.

Page 14 6017 Series Hot Oil Large Temperature Control Units