Temptek G-500 Series, Instruction Manual

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Temperature Control Unit : VTO Series with G500 Series Instrument
Page: 23
TEMPTEK, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277
Email: service@Temptek.com
switch to where the indicator points up.
Some older models have overload relay where a red button that pops out if the
overloads are tripped. Simply push the button in until the overloads are reset.
3. If a motor overload situation persists, the operator must adjust the flow rate to
match the system pressure loss (reduce flow rate) to prevent continual tripping of
the overload relay.
a. Open electrical cabinet panel door. The panel cover is hinged and held
open by a support cable. Note that the electrical power is engaged at
this point and caution must be observed while the cabinet panel is
open.
b. Identify the motor starter block. This block consists of the motor starter
contactor and the overload relay.
c. Place an amp meter on a single power lead coming from the overload
relay.
d. Locate the motor name plate on the pump motor housing. The full load
amp rating for the motor is listed on the name plate.
e. Engage the electrical power supply and start the unit.
f. The amp meter will display the motor amps. Compare the actual motor
amps as displayed on the amp meter to the full load amp rating as listed
on the motor name plate.
g. If the amp draw is excessive (higher than the listed name plate amp
rating), a throttling valve must be installed in the “from process” line. The
throttling valve can be a gate valve or a ball valve.
h. With the throttling valve installed, fully close the valve and then engage
the pump motor. Slowly open the throttling valve and monitor the motor
amps as displayed on the amp meter until the actual motor amps
equal the listed full load amp rating of the motor. The process flow is
now correctly adjusted. The valve should remain in this position during
operation.
6. LOW PROCESS FLOW: The minimum recommended process flow rate is 50%
of unit rated flow. Process restrictions may limit the flow to less than 50%. We
recommend the addition of bypass lines to raise the flow rate to 50%. The best
place to add bypass lines are on the extra ports on the process manifold. If extra
ports are not available, add a tee in the To Process and From Process lines,
install a bypass line between the two tees with a throttling valve. Adjust the valve
for a minimum of 50% of unit rated flow.
WARNING: Electrical power is engaged and caution should be employed while the cabinet is
open.