Problem Solutions
Tank overtemp condition 1. Adjust the tank temperature controller according to
section 5.3 of this manual. Inadequate tank
temperature can affect the performance of your hot
melt system. If the tank has reached an
overtemperature condition, try turning the controller
down. A failure of the solid state relay (closed
position) can cause the tank to reach over
temperature. Check the relay’s continuity – failure of
the relay is rare. If problem persists, replace the
faulty component (controller or relay). On units with
Standby, make sure Standby switch is disengaged
and in the Run position.
2. The Overtemperature (O.T.) switch is a safety
device designed to prevent the melt tank from
reaching a "run-away" temperature condition. Once
the melt tank reaches an over temperature condition,
the O.T. switch controls the tank's temperature.
Check the melt tank's temperature when the O.T.
indicator is lit. If melt tank temperature is too high,
turn the tank temperature controller down
(counterclockwise per section 5.3). If the O.T. light
is On at an acceptable or low tank temperature, the
O.T. switch is either faulty or rated at a low
temperature. The O.T. switch must be replaced in
either case. (Refer to section 9 for switch kits.)
Applicator and supply hose heat
slowly
1. Determine exact voltage of the melt unit. Insufficient
voltage can be the cause of these problems. Voltage
drops are common. Use a voltmeter to determine
whether sufficient voltage is supplied to the melt
unit. Also, the voltage of each melt unit component
must be compatible to the melt unit or serious
damage to the system will occur. (Refer to section
4.4, Electrical Circuits & Wiring).
2. Adjust the supply hose temperature controller
according to section 5.3 in this manual. Inadequate
supply hose heat can affect the performance of your
hot melt system. If problem persists, see Hose
Controller Replacement, section 8.2, and section 9
for Hose temperature controller kits.
3. Determine if applicator is heating by using a surface
temperature probe or a temperature-sensing device.
Do not touch applicator by hand to determine
temperature. Refer to the appropriate applicator
service manual. Determine exact voltage of the head
heaters and the supply hose (found on the
identification tags).
OVERTEMPERATURE
THERMOSTAT
2000285
30 KB30, KB50 and KB100 Series Hot Melt Units 19600-159 Rev. A 04/09/09 © Copyright Astro Packaging 2009
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