Temptek VETERAN LS Series, Instruction Manual

Page: 26 / 80

Temperature Control Units : With ‘LS’ Series Instrument
Page: 26
TEMPTEK, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277
Service Department Fax: 317-885-8683
www.Temptek.com
instrument will not start and will illuminate no FLO in the
temperature display window.
4. Conditions that will prevent the unit from starting process
temperature control operations are:
a. Water supply pressure inadequate (pressure
switch is open). The unit is prevented from
operating without adequate water supply pressure
by an electrical panel mounted pressure switch.
Sufficient water supply pressure must be present to
close the switch and consent the safety circuit.
b. Motor overload switch opened. The electric
motor is protected from excessive flow by a set of
thermal overload relays. These relays will open
(trip) and prevent operation. If open, the overload
relay must be reset before operations can continue.
An excessive flow condition must be corrected
immediately.
c. High temperature limit switch open. The unit
is prevented from operations with temperatures
exceeding 256°F by a “high temperature limit
switch”. This switch is installed in the To Process
temperature sensor. If this switch is open (due to
a high temperature condition), the control circuit
is not consented and the unit cannot be started. If
a high temperature condition exists, the unit must
first “cool down” (reduce water temperature) before
the “high temperature limit switch” will automatically
reset to allow operation.
d. Temperature sensor. Failure of the To Process
temperature sensor will be indicated in the
Temperature window by a “--- ---”. Check the
sensor cable and connector for loose wires or
moisture. If no problems are found, replace the
sensor.
B. INSTRUMENT OPERATION
1. Process temperature control operation is started by toggling
the unit’s On / Off rocker switch to the “on” position.
2. When the On / Off rocker switch is toggled “on”, the
instrument will immediately display the process temperature
as indicated by the temperature sensor.
3. If the indicated temperature is less than 100°F, the
instrument will automatically open the PVT
TM
cooling valve
for 45 seconds. This “automatic system vent cycle” will