10
On both open Closed-loop systems, turn on wa-
ter and insure the water supply lines are free
of obstructions BEFORE energizing the heater.
Such obstructions could prevent the thermal
expansion of water from backing up into this
line, thereby increasing system pressure until
the relief valve opens.
Note: This system is equipped with an ASME
safety pressure relief valve (factory preset at
125 psi or 150 psi with 7.5 hp motor).
1. Apply power to the system via the remote discon-
nect. The temperature controller and “LOW WATER
PRESSURE” diagnostics light should illuminate.
2. Open supply-water line and process valving to al-
low system to fill. Auto air bleed will remove air from
the system. Any remote air bleed valves should be
opened to remove air from process and associated
piping.
3. “LOW WATER PRESSURE” diagnostic light should
go out when the system is filled and has reached
20 psi. The system will not start when light is illumi-
nated.
4. Adjust the temperature setpoint to the desired lev-
el.
5. Assure that Pump Rotation Check was performed
per instructions on page 12.
6. Start the pump by pressing on the front panel. The
pump indicator light will illuminate.
7. Once temperature has stabilized at the setpoint
level, review controllability of the system. If the
temperature is fluctuating at an unacceptable level,
consult the temperature control instruction manual
for details on tuning the controller.
8. If the system temperature is below the current set-
point, heat will be applied by the controller to the
heater elements. If the temperature is above the
setpoint, the cooling solenoid will open (open and
closed loop) to reduce the system temperature.
Operating systems at temperatures above
140°F will create surface temperatures on
pipes that can cause burns. Precautions should
be taken to prevent operator contact with hot
pipes. Also, bleed valves should be locked
down to prevent release of hot fluid.
Note:
This is a PID type controller and cycling of the
heat and cool can be expected below and above set-
point.
9. For system shutdown, lower the setpoint to 90°F or
lower, Allow the system to cool to this temperature
level.
10. Press to de-energize the pump and disable the
system.
11. Disconnect power to the unit.
Do not leave system unattended in a HOT elec-
trical condition; and do not leave system unat-
tended in HOT environmental conditions.
Section 4 – Operation
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com