9
SERVICE AND TESTING PROCEDURES
Most tests will be performed with the cover
removed from the unit. To remove cover, remove
the nine screws securing the cover and lift the
cover straight up and off the unit.
CAUTION
WIRING IS OPEN AND A POTENTIAL SHOCK
HAZARD. UNPLUG UNIT WHENEVER
POSSIBLE FOR TESTS OR REPAIRS.
Refer to the electrical wiring diagram at all times
to aid in tests. White wires are changed to blue
wires on 240V units.
Therminal block (T.B.) is numbered from one at
the bottom to six at the top. Facing the terminal
block, T.B. Terminal R-1 would be the bottom-right
terminal screw location.
Compression nuts on tubing must not be over-
tightened. Tighten new compression nut one
complete turn after finger tight. Retighten nut one
half turn after finger tight. Tighten nut
approximately one quarter turn if leaking.
1.0 FUSE: Unplug unit from electrical outlet.
1.1 Remove fuse from fuse holder and measure
its resistance with an Ohmmeter. It should be less
than one ohm. If fuse is open, replace with same
type and amperage rating. On 100/120V units,
fuse is rated 15 amps. On 240V units, fuse is rated
8 amps.
1.2 If fuse was open; See Section 13 to test
heating elements as a probablecause for fuse
opening circuit.
2.0 POWER PLUG: Unplug unit from electrical
outlet.
2.1 With an Ohmmeter, measure the resistance
from ground contact on the power plug to the units
body. It should be less than one ohm. If not, check
ground connection on unit and in power plug.
2.2 Plug unit in electrical outlet. Measure the AC
voltage across the black and white wire at the
center of the power switch. If full line voltage is
not present and fuse is good; check for loose
connections in the power plug.
3.0 POWER SWITCH: Unplug unit from electrical
outlet.
3.1 With Power Switch in 'OFF' position, measure
the resistance across the two white wires. Then
measure across the two black wires on the Power
Switch. Both measurements should show an
infinite resistance.
3.2 Perform Step 3.1 with the Power Switch in
the 'ON' position. Both measurements should be
less than one ohm.
3.3 If your measurements are different than
above, replace Power Switch.
4.0 TIMER: Plug unit into electrical outlet.
4.1 Turn Timer of 'OFF' position. Turn Power
Switch 'ON', the buzzer should be activated. If
buzzer does not activate, measure AC voltage
from T.B. Terminal #2 to the black wire connection
at the buzzer. If voltage is present, replace buzzer.
If no voltage is present, replace Timer. Measure
AC voltage across T.B. Terminals #2 and #3. No
voltage should be present.
4.2 Now turn Timer to any 'ON' position. Buzzer
should deactivate. Measure AC voltage across T.B.
Terminals #2 and #3. Full line voltage should be
present. If not, replace Timer.
4.3 If during a normal autoclave or dryer cycle
the Timer does not run-out, remove power to
heaters and activate the buzzer, the Timer should
be replaced.
5.0 LOW WATER CUTOFF SWITCH: Designed
to remove power from the heating element and
solenoid valve in the event that the vessel water
level gets too low. This switch is located on the
underside of the vessel. See Figure 3.
5.1 To test, first ensure the vessel is below 100°C
and empty of water. Connect an AC voltmeter
across T.B. Terminal #2 and #3. Turn Power Switch
and Timer 'ON'. Temperature and Time lights shold
be on. Full line voltage should be present. If not,
check Timer and center wire on the Function
Switch. Now move meter lead from T.B. Terminal
#3 to the center wire on the Function Switch. If full
line voltage is not present, replace the Low Water
Cut-Off Switch.
