11
8.4 If Sensor does not consistently switch at the
same temperature or cannot be properly adjusted,
the Sensor Assembly should be replaced. See
Section 16.
9.0 RELAY: The Relay, once energized by the
Sensor, will latch and remain latched until the /
timer runs out, power turned 'OFF' or until the
Function Switch is turned to Dryer 'ON' position.
When the relay is latched, it supplies power to
energize and close the Solenoid Valve.
9.1 If vessel is hot, let cool for 10 minutes then
refill vessel to proper water level, turn Function
Switch to Dryer 'OFF' position, turn Timer and
Power Switch 'ON'. Connect and AC Voltmeter
across T.B. Terminal #2 and the orange wire con-
nection on the Sensor Switch. No voltage should
be present. If voltage is present, replace Sensor
Assembly.
9.2 Now move meter test lead from orange wire
to T.B. Terminal #6. If voltage is present, replace
relay. Momentarily touch an insulated jumper wire
across the two wire connections on the Sensor.
The relay should latch and the meter should
indicate full line voltage, If voltage is not present
and/or relay will not remain latched with jumper
wire removed, replace relay. If relay vibrates or
clatters, it should be replaced.
10.0 SOLENOID VALVE: The Solenoid Valve,
when energized, closed and allows vessel to
pressureize. See Figure 2.
10.1 Unplug unit from electrical outlet. Disconnect
the Solenoid wire from T.B. Terminal #R6.
Temporarily connect this wire to T.B. Terminal #3.
Plug unit into electrical outlet. Turn Power Switch
'ON'. Now turn Timer 'ON' and 'OFF' several times.
When the Timer is turned 'ON' you should hear a
sigle audible click which indicates actuation of the
valve and continuity of the solenoid coil. If you
cannot hear the Solenoid Valve actuate or if it
clatters when energized, it should be replaced.
Unplug the unit and return the Solenoid wire from
T.B. Terminal #3 to T.B. Terminal #R6.
10.2 Now test Solenoid Valve under operation. If
vessel is hot, let cool for 10 minutes. Refill vessel
to proper eater level, turn Function Switch to Dryer
'OFF' position, turn Timer and Power Switch 'ON'
and rotate Autoclave Temperature Control to
highest setting. Connect an AC Voltmeter across
T.B. Terminal #2 and T.B. Terminal #6. No voltage
should be present until Sensor sences 103°C
steam from vessel. If voltage is present, see
Sections 7 and 9 for Sensor and Relay problems.
10.3 When the vessel reaches 103°C, the relay
will will be latched and power applied to the
Solenoid Valve. This will be indicated on the
Voltmeter. The purging of excess water and steam
into the Condenser Tank should stop completely.
Pressure should begin to build up in the vessel as
indicated on the Pressure Gauge.
10.4 If Solenoid Valve is clattering, it should be
replaced. Observe condenser coil in Condenser
Tank for water or steam escaping, which would
indicate a leaking or open Solenoid Valve. See
Figure 4. At this time, also abserve the Safety
Pressure Relief Valve for any leaks. Replace if
leaking.
10.5 If Solenoid Valve appears to be leaking, turn
unit off and allow it to cool. Before replacing
Solenoid Valve, attempt to clean the Valve Seat.
Remove the 3/4" Hex Head Plug from the Solenoid
Valve body. Inspect and clean debris from the
spring loaded metal encased rubber plunger and
the metal valve body seat. Reassemble and retest
as in Section 10.2. If Solenoid Valve still fails to
function properly, it should be replaced.
11.0 AUTOCLAVE TEMPERATURE CONTROL:
This control is a pressure actuated switch which
opens the circuit to the autoclave heating element
when set prssure has been reached.
