Temptek VETERAN LS Series, Instruction Manual

Page: 30 / 80

Temperature Control Units : With ‘LS’ Series Instrument
Page: 30
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
4.1 UNIT WILL NOT START (POWER LIGHT IS NOT ILLUMINATED)
A. One or more fuses at the main disconnect device are open (blown).
Determine continuity at each fuse. If continuity is not determined,
replace the fuse. Then determine cause of blown fuse.
B. Control circuit transformer fuse is open (blown). Determine
continuity at the control circuit transformer fuse. If continuity is not
determined, replace the fuse.
4.2 UNIT WILL NOT START (POWER LIGHT IS ILLUMINATED)
A. Power supply is ON. The operator can determine that electrical
power supply to the unit is “on” by an illuminated Power light on the
display. Even with the main power supply on, the unit is prevented
from operating by one of the following conditions:
1. Water supply pressure inadequate. (pressure switch
is open). The unit is prevented from operation without
adequate water supply pressure by the electrical panel
mounted pressure switch. Sufficient water supply pressure
must be present to close the switch.
2. Motor overload switch opened. The electric motor is
protected from overload conditions by a set of thermal
overload relays. These relays will open (trip). If the overload
relay is open, it must be reset before operation can
continue. An excessive flow condition must be isolated and
corrected immediately.
3. High temperature limit switch open. The unit is prevented
from operations at 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 unit cannot be started
and must “cool down” before the “high temperature limit
switch” will automatically reset.
4.3 UNIT STOPS
A. The operator should determine the main power supply to the unit
is ON by an illuminated Power light on the display. With the main
power supply “on”, the unit will be prevented from starting by the
following conditions:
1. Water supply pressure inadequate. (pressure switch
is open). The unit is prevented from operation without
adequate water supply pressure by the electrical panel
mounted pressure switch. Sufficient water supply pressure
must be present to close the switch.
2. Motor overload switch opened. The electric motor is
protected from overload conditions by a set of thermal