Temptek G-500 Series, Instruction Manual

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Temperature Control Unit : VTO Series with G500 Series Instrument
Page: 22
TEMPTEK, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277
Email: service@Temptek.com
2. To correct unit phase:
a. Disengage the electrical power supply to the unit at the unit’s disconnect
switch. Follow proper lockout procedures before proceeding.
b. Once the electrical power supply is disengaged, reverse any two power
leads of the power cord at the fused disconnect terminals.
c. Note: The operator must reverse the power leads at the disconnect
only and not at the power entry terminals on the unit’s electrical
panel. The unit’s internal electrical system wiring is phased correctly at
the factory and must not be altered in the field.
C. Process Flow Adjustments
1. The operator must determine and set proper fluid flow rate for the most efficient
and trouble free operation.
a. Fluid flow rate through the process is determined by the pressure losses
in the process loop. Generally, higher flow rates result in turbulent flow
achieving maximum temperature control and lower maintenance.
b. If the flow rate exceeds the motor horsepower capacity, the electric motor
will draw excessive amps. This is a result of the process loop’s ability to
flow fluid at a greater rate than can be provided by the pump. This will
eventually result in tripping the motor overload relay (overload relays
open) and the unit will shut down and the instrument will indicate an
alarm condition.
2. If an excessive flow situation is encountered and the motor overload circuit
has tripped, the operator must manually reset the overload relay before
operations can continue. Disconnect from power and follow proper lock out tag
out procedures prior to opening the electrical panel cover and identifying the
overload relay.
Overload relays have a switch (pictured below). This switch will be positioned
with the indicator pointing up when in normal operation. The indicator will be
pointing to the left when the overloads are tripped. To reset, simply turn the
WARNING: To correct phase ... switch power leads at the disconnect switch only.
Normal Operating Position Tripped Position