AEC TCU Series Open Reservoir Water Temperature Control Units - Manual (Page 36)

Open Resevoir Water Temperature Control Units Page 37
þ
1) Your Open Resevoir water temperature control system operates with hot
water under pressure. To reduce the risk of scalding:
• Always wear work gloves and safety glasses when operating the unit.
• Never operate the unit with panels or shields removed.
• Pipe the relief valve to an open drain.
• Never install a fitting or hose that is rated less than 150 psig and 180°F
(1,034.25 kPa/10.34 bars and 82ºC).
2) To reduce the risk of electrical shock:
• All electrical installation and repairs should be done by a qualified
electrician.
• Ground the unit in accordance with electrical codes.
• Never attempt any repairs without first opening and locking out the main
disconnect.
• Never deactivate or neutralize any safety device.
5-4 Sequence of Operation
The simplicity of design and the highly engineered controller make this unit almost
self-operating. The
START and STOP buttons and the temperature controller buttons
are all that is required to operate this unit.
After you complete all connections, turn the water supply
ON , then turn control
power ON . The unit automatically fills the reservoir tank.
As the water comes in the reservoir tank, the water must enter the pump, up through
the tank and out through the
TO PROCESS line, through the process, and back
through the FROM PROCESS line to the reservoir tank.
þ
TCU systems provide temperature control on processes by directly heating the
process water and injecting cooling water into the heat exchanger (if option was
selected).
þ When the unit is energized, reservoir will be filled through the auto-fill solenoid
valve.
þ After filling, the microprocessor controller monitors the TO PROCESS RTD
probe, cycling open the cooling valve on the optional heat exchanger or
energizing the immersion heater to maintain the process set temperature.