Advantage Sentra SK Series, Instruction Manual

Page: 32 / 70

Temperature Control Units : Sentra with VE Series Instrument
Page: 32
Advantage Engineering, Inc.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: 317-881-1277
Service Department Fax: 317-885-8683
www.AdvantageEngineering.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 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.