NAPCO 8100-TD User manual

Installation/Service Manual
TEST CHAMBER
Model 8100-TD
Precision
170 Marcel Drive
Winchester, VA
USA
Phone: [phone]
Toll Free: 800-621-8820
FAX: [phone]
Manual P/N 34000716
Rev. D Dated 23AUG99
MODEL 8100-TD TEST CHAMBER
E SERIES
POWER
ON
VALVE
30
CONDENSATE
DRAIN
40 20
OFF
HOURS
TIME
50 10
TEMP
LO
AUTOCLAVE TEMP
HI
5
43
LO
1
2
DRYER TEMP
DRYER
MED
ON
HI
OFF
DRYERME

NOTICE
THE MATERIAL IN THIS MANUAL IS FOR INFORMATION PURPOSES ONLY. THE
CONTENTS AND THE PRODUCT IT DESCRIBES ARE SUBJECT TO CHANGE WITHOUT
NOTICE. NAPCO MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT
TOTHISMANUAL.INNOEVENTSHALLNAPCOBELIABLEFORANYDAMAGES,DIRECT
OR INCIDENTAL, ARISING OUT OF OR RELATED TO THE USE OF THIS MANUAL.
For repair information or replacement parts assistance from the manufacturer,
call Customer Service using our toll free telephone number.
800-621-8820
540-869-9892
(FAX) 540-869-0130

INDEX DATE
REVISION STATUS
Initial releaseA
AMENDED PAGES NOTES
D 8/99 All Update part no's. and combined
service manual (3400745) with
user manual

Contents
Introduction ...................................................................................................................... 1
Unpacking and Damage................................................................................................... 1
Initial Procedure After Unpacking..................................................................................... 2
Explanation of Controls and Their Operation ................................................................... 2
Loading The Test Chamber.............................................................................................. 3
Procedure for Operation of Test Chamber ....................................................................... 3
Procedure for Operation of Dryer Cycle ........................................................................... 4
Maintenance Suggestions................................................................................................ 4
Sterilizing Cycle Data ....................................................................................................... 5
Explanation of System Operation..................................................................................... 6
Troubleshooting Procedures ............................................................................................ 7
Service and Testing Procedures....................................................................................... 9
Assembly Drawings.......................................................................................................... 16
Replacements Parts List .................................................................................................. 18
Wiring Diagram ................................................................................................................ 20
Warranty........................................................................................................................... 21

1
INTRODUCTION
Your satisfaction and safety are important to
PRECISION anda complete understandingofthis
unit is necessary to attain these objectives.
As the ultimate user of this apparatus, you
have the responsibility to understand its proper
function and operational characteristics. This
instruction manual should be thoroughly read and
all operators given adequate training before
attemptingto place thisunitin service. Awareness
of the stated cautions and warnings, and
compliance with recommended operating
parameters — together with maintenance
requirements—are important for safe and
satisfactory operation. The unit should be used
for its intended application; alterations or
modifications will void the warranty.
WARNING
AS A ROUTINE LABORATORY PRECAUTION,
ALWAYS WEAR SAFETY GLASSES WHEN
WORKING WITH THIS APPARATUS.
This product is not intended, nor can it be
used, as a sterile or patient connected device. In
addition, this apparatus is not designed for use in
ClassI,II,orIII locations as definedby the National
Electrical Code.
UNPACKING AND DAMAGE
This product was carefully packed and
thoroughly inspected before leaving our factory.
Save all packing material if apparatus is received
damaged.
Responsibilityfor safe deliverywasassumed
by the carrier upon acceptance of the shipment;
therefore, claims for loss or damage sustained in
transit must be made upon the carrier by the
recipient as follows:
Visible Loss or Damage: Note any external
evidence of loss or damage on the freight bill or
expressreceipt, and haveitsigned by thecarrier's
agent.Failuretoadequatelydescribesuchexternal
evidence of loss or damage may result in the
carrier's refusing to honor your claim. The form
required to file such claim will be supplied by the
carrier.
Concealed Loss or Damage: Concealed
loss or damage is any loss or damage which does
not become apparent until the merchandise has
been unpacked and inspected. Should either
occur, make a written request for inspection by
carrier's agent within 15 days of the delivery date;
then file a claim with the carrier.
If you follow the above instructions carefully,
Precision will guarantee our full support of your
claim to be compensated for loss or damage in
transit.
DO NOT — for any reason — return this unit
to PRECISION without first obtaining return
authorization. In any correspondence with
PRECISION please supply the nameplate data,
including catalog number and serial number.

2
EXPLANATION OF CONTROLS AND
THEIR OPERATION
1) Power ON-OFF switch: Applies power to unit.
2) Dryer function switch: In the "ON" position,
the drying function is enabled and test
chamber function is disabled. In the "OFF"
position,thedryingfunctionsdisabledandtest
chamber function enabled.
3) Timer: Manuallysettable, 60 hourmaximum,
must be turned past 5 hours before setting
desired time. (Optional 120 hour timer
available.) Timer enables and controls both
the test chamber and drying time. Timer in
timed-out position de-energizes a solenoid
valvereleasingpressurefromchamber(when
intestchamber operation) and willalsosound
an alarm indicating end of cycle. Power ON-
OFF switch will disable alarm.
4) Test chamber temperature control: Controls
temperature/pressure when in test chamber
operation. Low position corresponds to
approximately 121°C and 15 P.S.I.. High
positioncorresponds to approximately132°C
and 27 P.S.I..
5) Dryer temperature control: Controls
temperaturewhendrying function isselected.
Low position corresponds to approximately
40°C.
6) Condensate valve and drain: Used to drain
excess water from condensation tank after
every test chamber cycle.
INITIAL PROCEDURE AFTER
UNPACKING UNIT
WARNING
FOR PERSONAL SAFETY, THIS APPARATUS
MUST BE PROPERLY GROUNDED.
Electrical Connections
The 8100-120 Autoclave is equipped with a
three-pronged (grounded) plug power cord. This
mates with a three-prong receptacle to minimize
the possibility of electric shock. The user should
have the wall receptacle and circuit checked by a
qualified electrician to make sure the receptacle
is properly grounded.
Where a two-prong wall receptacle is
encountered, it is the personal responsibility and
obligation of the user to have it replaced with a
properlygroundedthree-prongwallreceptacle. Do
not, under any circumstances, cut or remove
the third (ground) prong from the power cord.
Do not use a two-prong adapter plug.
Determine the total amount of current being
used by other apparatus connected to the circuit
that will be used for this apparatus. It is critical
that the added current demand (see nameplate)
of this and other equipment used on the same
circuit does not exceed the rating of the fuse or
circuit breaker.
CAUTION
BE SURE THAT THE POWER SUPPLY IS OF
THE SAME VOLTAGE AS SPECIFIED ON THE
NAMEPLATE.

3
LOADING THE TEST CHAMBER
STEP 1
Pour water into chamber reservoir. A measuring
cup is supplied. Fill until water level reaches the
level indicator on the shelf.
NOTE:
WATER LEVEL MUST REACH LEVEL
INDICATOR BEFORESTART OFEACHCYCLE.
STEP 2
Load chamber with devices to be tested. Ar-
range devices so water will not be trapped
between them or in indentations on devices.
This will help facilitate drying.
STEP 3
After loading the test chamber, close door,
replace yoke and tighten securely.
PROCEDURE FOR OPERATION OF
TEST CHAMBER
STEP 1
Set test chamber temperature control to position
3 at the center of dial. This position will set the
test chamber temperature at about 127° C.
(260°F.). When the temperature is achieved,
the thermometer pointer will be positioned in the
red area.
If a test chamber temperature (other than the
temperature set above) is desired, the following
information will be helpful for setting the test
chamber temperature.
The numbers on the test chamber
temperature control correspond to higher
temperature settings. The point reference low on
thedialface correspond to atemperatureof121°C
(250°F). Numbers between the reference
correspondto temperatures withintherange. The
range is indicated by a red area on the
thermometer face. To operate the test chamber
within the range, turn control knob to the high
position and watch the
thermometer pointer.
When the pointer
indicates a desired
test chamber
temmperature, turn
the control knob
clockwise until the
temperature indicator
light just goes out. The
indicator light will then cycle on and off as the
temperature is controlled at set point.
STEP 2
Ensure that the power switch and dryer switch
are at "OFF" position.
STEP 3
Set the timer to desired test chamber time.
Then set the power switch to the "ON" position.
(The chamber will immediately begin to heat and
will purge cold air from inside the chamber for
approximately 10 minutes. At this time the
temperature will be 95°C to 100°C. Purging will
stop and chamber will rise to desired operating
temperature and pressure. Temperature and
pressure will be maintained until end of timed
cycle.)
AUTOCLAVE TEMP
2
4
HI
5
3
LO
1
121˚C
132˚C
T
E
M
P
E
R A
T
U
R
E
R
A
N
G
E

4
STEP 4
At the end of set time interval an alarm will
sound. The alarm will continue to sound until
the power switch is set to "OFF" position. The
test chamber will automatically vent and stop
heating. Allow the chamber temperature to
decrease to at least 100°C (212°F) before
opening the door. Open the door and leave ajar.
STEP 5
Before the next cycle "drain condensate".
Condensate should be drained after each cycle.
The chamber reservoir should be refilled to
water level indicator.
PROCEDURE FOR OPERATION OF
DRYER CYCLE
To operate the dryer cycle: leave door slightly
ajar, set the dryer switch to "ON" position, set
the dryer temperature control to "LOW" position,
set the timer to desired drying time interval, set
the power switch to "ON" position. At the end of
the set time interval, an alarm will sound. The
alarm will continue to sound until the power
switch is set to "OFF" position. The dryer
temperature control also has a medium and high
setting, select a higher temperature if desired
but use caution to avoid overheating contents.
MAINTENANCE SUGGESTIONS
1) At the end of one or two test chamber
cycles: Remove screw fastener which holds
shelf in place. Remove shelf to gain access
to water reservoir. Add mild detergent to
water and scrub reservoir and rinse cham-
ber thoroughly with clear water. Replace
shelf as above.
2) Oil "T" handle threads twice a year or as
often as needed.

5
ITEM TO BE
STERILIZED
STERILIZING
TEMP.
C°
STERILIZING
TEMP.
F° PRESSURE
TIME REQUIRED
TO STERILIZE
(IN MINUTES AT
AT STERILIZING TEMP)
INSTRUMENTS 121°
132°
250°
270°
15
27
20
3 TO 6
COTTON 121°
132°
250°
270°
15
27
30
15
RUBBER 121°
132°
250°
270°
15
27
30
15
250cc FLASK (Thin Glass)
125cc FLASK (Thin Glass)
50cc FLASK (Thin Glass)
2 OZ. Comm. Bottle
121°/123°
121°/123°
121°/123°
121°/123°
250°/254°
250°/254°
250°/254°
250°/254°
-
-
-
-
8-10
8-10
6-8
8-10
LIQUIDS (MEDIUM) 121°/123° 250°/254° 15 15
NOTE: Sterilizing time will vary with the quanitity of items in the Autoclave vessel. Use a steam
clox sterilization indicator with each load.
The data shown above is based on operation of the unit at or near seal level. Because the boiling
point of water varies with altitude the cycle time required for sterilization will also vary.
Useful information for Autoclave use other than microcircuit device testing. You may want to manu-
ally time the Autoclave cycle in the following applications, due to the short time intervals involved.
MODEL 8100-TD
STERILIZING CYCLE DATA

6
EXPLANATION OF SYSTEM OPERATION
With the water level established, door tightened,
Power Switch 'ON', Dryer switch to Dryer 'OFF',
(Autoclave 'ON'), and Timer selection made, the
autoclave will begin heating. Illuminated indicator
lights will verigy that heating and timing circuits
are operational.
During the first stage of vessel heating (approx.
10 minutes from ambient) cold air will be purged
from the vessel so that uniform heat is attained
before pressurization of the vessel. A normally
opensolenoidvalve allows this purgingactionuntil
the steam temperaute in the purge line reaches
3°C above the boiling point of water.
The Sensor (temperture-sensitive switch) located
inthepurgelineisfactorysetat103°C. Thesensor
switch is normally oopen until heated to 103°C, at
whichtimethisswitch closes, energizinga latching
relay. Thje latched relay energizes the solenoid
valve,closing the purgeline. Therelaywill remain
latched until the Timer runs out or until power is
removed. If there is a power interuption, the relay
will unlatch, the solenoid valve will open; steam
will enter the purge line, the Sensor switch will
sensethesteamtemperatureand close, the realay
will latch and the solenoid valve will close. This
take s approximately 6 seconds.
Theautoclave Temperature Control isapressure-
sensitiveswitchwithasensitivity of lessthan 2 PSI.
When the desired autoclave temperature is
reachedm, the normally closed Temperature
Control Switch will open; according to the
relationship that exists between temperature and
steam pressure. The element will stop heating
andthetemperature indication lightwill extinguish.
Thetemperauterandpressure will drop,the switch
willclose andthe element willbegin to heatagain.
This cyclic action will continue until the Timer runs
out. Them temperauter indicatiing light will verify
the operation of the Temperature Control Switch.
Theautoclave is providedwithtwo safety devices,
a low water cut-off switch and a pressure relief
valve.
The low water cut-off switch will be activated if the
unit is allowed to run out of wate, caused by not
filling vessel to water indicator at the beginning of
each cycle or due to purge system failure in which
water is boiled out of the system. The normally
closed contacts, on this snap-action thermostat
switch,willopenwhenitsensesandoutsidevessel
temperature of 132°C and will close again at
110°C. It opens the circuit to the heating element.
Thetimer willcontinue to operateand will shutthe
unit off when the set time has elapsed.
The Pressure Relief Valve is located in the
condensertankassembly. Itisasafeguardagainst
temperature control failure in which case the
autoclave heating element would overheat the
vessel giving a corresponding increase in
pressure. Thepressurerelief valve will openwhen
the vessel pressure reaches 35 PSI ± 3 PSI,
venting steam into the condensor tank. If not is
around to notice the malfunction, the relief valve
will vent pressure form the vessel until the water
is boiled out. The low water cut-off switch will then
shutofftheheatingcircuit as previouslydescribed.
The condensor tank collects purged water and
condensedsteam. Itshouldbe drained afterevery
cycle with the drain valve and drain hose fitting
located onthe control panel.
The 8100-TD is equipped with a drying element.
NOTE: The dryer should be used with the door
ajar. It is operated by turning the Power Switch
'ON', Dryer Switch to 'Dryer ON' position setting
the timer and selecting the desired drying
temperatureinthedryerTemperatuerControl. The
Dryer Temperature Control is an infinite control
which varies the cyclic on-off rate of current being
supplied to the dryer heating elemetn and thus
controllingthe temperature insidethevessel. This
control is variable from Low position to High
position. Low corresponds to approx. 50°C,
medium is approx. 90°C and high corresponds to
approx.150°C. These measurements weretaken
with a thermocouple mounted in a 14 pin plastic
dip integrated circuit, positioned in the center of
the S.S.T. Tray supplied with the unit. The door
was opened 1/4" from vessel during test.

7
7. Poor or high temperature/
Pressure regulation. 1. Autoclave Temperature control faulty; See Section 11.
8. No pressure, water boils out. 1. Sensor switch does not close or needs calibration; See
Section 7.
2. Solenoid valve stuck open or coil open; See Section 7.
3. Possible relay problem; See Section 9.
9. Audible sound of steam
purging into condeser tank
every 3-10 minutes, unit may
run out of water.
1. Autoclave Temperature control faulty; See Section 11.
1. Low water cut-off switch stuck open; See Section 5.
2. Function Switch in wrong position or faulty; See Section 6.
3. Autoclave Temperature Control stuck open; See Section 11.
3. Unit does not heat, Tempera-
ture Light 'OFF', Timer Light
'ON'. 1. Autoclave Temperature control; See Section 11.
2. Pressure leak; See section 15.
4. Operating Temperature and
pressure cannot be achieved.
5. Temperature low, proper
pressure. 1. Sensor activating too soon; See Sections 7 & 8.
6. Temperature fluctuating 4°C
or more on gauge, pressure
fluctuation normal ± 1 PSI.
1. Water level low, not covering heating element.
Troubleshooting Procedures
Problem Procedure
1. Heating Element open; See Section 13.2. Unit does not heat, Tempera-
ture light 'ON', Timer Light
'ON'.
1. No Power, Temperature Light
'OFF', Timer Light 'OFF'. Unit
does not heat.
1. Check plug and electrical outlet; See Section 2.
2. Fuse, Section 1. Also check heating element for short to
ground; See Section 13.
3. Power switch faulty; See Section 3.

8
Troubleshooting Procedures (Cont.)
Problem Procedure
10.Excessive loss of water
noticed after normal cycle. 1. Vessel not filled to proper water level at beginning of cycle.
2. Steam leak at door gasket.
3. Steam leak at copper tubing connections; See Section 15.
4. Debris on solenoid valve seat causing leak; See Section 10.
5. Several or extended power interruptions.
6. See Problems #7 & #9.
7. Safety pressure relief valve seat leaking; See Section 15.
1. Dryer Element open; See Section 13.
11.Drying element does not
heat, Dryer Light 'ON', Timer
Light 'ON'
12.Drying element does not
heat, Dryer Light 'OFF', Timer
Light 'ON'.
1. Function switch in wrong position or faulty; See Section 6.
2. Dryer temperature Control faulty; See Section 14.
13.Timer does not function
properly
14.Unit runs out of water or fails
to shut off at excessive
temperature resulting heat
damage.
1. Low Water Cut-Off Switch failure; See Section 5.
1. Timer; See Section 1.

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-1wouldbe 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,
fuseis rated 15amps.On240V units,fuse israted
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
fromground contact onthepower plug totheunits
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: Unplugunit fromelectrical
outlet.
3.1 WithPower Switchin'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
atthe buzzer.If voltageispresent,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
shoulddeactivate.MeasureACvoltageacrossT.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
acrossT.B.Terminal#2and#3.TurnPowerSwitch
andTimer'ON'. Temperature and Time lightsshold
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.

10
5.3 If installing a new switch, test by repeating
steps 5.1 and 5.2.
6.0 FUNCTION SWITCH: When this switch is in
the Dryer 'ON' position, the Drying Element
circuitryisenabledand autoclave circuitsdisabled.
When in Dryer 'OFF' position, the autoclave
circuitry is enabled and Dryer circuits disabled.
6.1 To test, connectandAC Voltmeteracross T.B.
Terminal #2 and center wire connection at the
Function Switch. Turn the Timer 'ON' and turn the
Power Switch 'ON'. the full line voltage should be
present. If not see Sections 1 through 5.
6.2 Move meter test lead from enter wire to top
wire connection on Switch. Turn Switch to Dryer
'OFF'position. Fulllinevoltageshould bepresent.
Nowturn Switch toDryer'ON'position, Novoltage
shouldbe present.Iftheseconditions arenotmet,
replace Switch.
6.3 Move meter test lead from top wire to bottom
wire connection on Switch. With Switch in Dryer
'ON' position, full line voltage should be present.
Turn Switch to Dryer 'OFF' position; no voltage
shold be present. If these conditions are not
present, replace switch.
7.0 SENSOR: (Thermal Switch, Factory set to
103°C) The sensor is a switch which activates a
latching relay which inturn emergizes (closes) a
solenoid valve to stop the vessel from purging
when the purging steam reaches 103°C.
7.1 To test,fill vesseltoproperwaterlevel, tighten
door, turnFunction Switch toDryer'OFF' position,
turn Timer and Power Switch 'ON'. Temperature
light should be on now. Connect an AC Voltmeter
across T.B. Terminal #2 and the black wire
connectionon theSensorSwitch. Full linevoltage
shold be present. If not, check for loose wires at
terminal block. Move meter test lead from black
wire to orange wire connection on Sensor Switch.
If line voltage present, replace Sensor Assembly.
No voltage shold be present until vessel
temperature reaches 103°C. It will take
approximately minutes for the vessel to reach this
temperature from ambient. Observe temperature
gauge on door while unit is heating. Meter should
displaya change fromzerovoltsto fullline voltage
when temperature gauge reaches 103°C±1°C. If
Sensordoesnot function properly,seeSection8.0
(Sensor Adjustment) before replacing Sensor. If
Sensoractivatesatalow temperature, turn Sensor
adjusting screw 1-1/2 turns clockwise before
proceedingwith adjusment procedure.SeeFigure
2 for adjustment screw location and use and
electrically insulated screwdriver if unit is plugged
into electrical outlet.
8.0 SENSOR ADJUSTMENT: The Sensor is set
atthe factory (nearsealevel)to closethe solenoid
at 3°C above the boiling point of water. Since the
boiling point will vary with altitude the Sensor may
need adjustment when setting up the unit for
operation at much higher elevations. Note the
applicabel temperature on the following chart.
8.1 If vessel is hot, let cool for 10 minutes. Refill
vessel to proper water level, tighten door, turn
FunctionSwitchto Dryer 'OFF'position, turnTimer
andPowerSwitch to 'ON'. Vessel wll beginto heat.
8.2 Connect and AC Voltmeter across T.B.
Terminal #2 and the orange wire connection on
the Sensor Switch. The meter should indicate no
voltagepresent.ObservetheTemrperatureGauge
whilethevesselisheating.When the Temperautre
Gauge just reaches 3°C above the local boiling
point of water, turn the Sensor adjusting screw
counterclockwise until meter indicates full line
voltage. An audible click of the Solenoid Valve
closing also indicates line voltage is present. Now
turn Power Switch 'OFF'.
8.3 Repeat Step 8.1 and 8.2 to confrm that the
Sensor Adjustment is now correct. If during Step
8.2 the Sensor switched befor the desired
temperature, turn the Sensor Adjusting Screw 1-
1/2 turns clockwise and repeat Steps 8.1 and 8.2.
BOILING TEMPERATURE OF WATER VS. ALTITUDE
ALTITUDE
(METERS) TEMP. °C ALTITUDE (FT.) TEMP. °F
0100 0212
150 99.5 1000 210.1
300 98.9 2000 208.3
600 97.9 3000 206.5
900 96.9 4000 204.6
1200 95.9 5000 202.8
1500 94.8 6000 201.0
2000 92.9 7000 199.3

11
8.4 If Sensor does not consistently switch at the
sametemperature or cannotbeproperlyadjusted,
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 Unplugunitfromelectrical 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'.Nowturn Timer'ON' and'OFF'severaltimes.
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
toproper eater level,turnFunctionSwitch 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 purgingof excesswaterandsteam
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.
Removethe3/4"HexHead Plug from theSolenoid
Valve body. Inspect and clean debris from the
spring loaded metal encased rubber plunger and
themetal valve bodyseat.Reassembleand 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.

12
11.1 To test, let vessel cool for 10 minutes if hot.
Refill vessel to proper water level, turn Function
Switch to Dryer 'OFF' position, turn Timer and
Power Switch 'ON' and rotate Autoclave
Temperature Control to highest setting. If the
Temperature Pilot Light is 'OFF' connect an AC
Voltmeter across T.B. Terminal #2 and T.B.
Terminal #4. Full line voltage should be present. If
not, see Sections #3, #4, #5 and #6. Now move
meter test lead from T.B. Terminal #4 to T.B.
Terminal #5. Full line voltage should be present
while vessel is in its' initial heating stage before
pressurization. If line voltage is not present at T.B.
Terminal #5, replace Autoclave Temperature
Control. See Section 17. If this is a new control,
ensure one wire is connected to 'Common' and
the other wire connected to the 'N.C.' (normally
closed) contact on the controller.
11.2 Allow vessel to continue heating until
maximum temperature and pressure are
readched, If pressure goes above 30 PSI or
controls at less tan 27 PSI at maximum setting,
go to Section 12 to attempt adjustment. If
controlled pressure fluctuates more than 2 PSI
from set point after one hour, replace Autoclave
Temperature Control. See Section 17.
12.0 AUTOCLAVE TEMPERATURE CONTROL
ADJUSTMENT:
12.1 While vessel is under pressure in autoclave
cycle,loosenthetwosetscrewsin the control knob
and remove knob. Set the control knob shaft so
thatthe Autoclave TemperatuerConteol regulates
at 27 PSI ± 1 PSI/133°C±1°C. If pressure/
temperature is high, turn shaft clockwise. Allow
controller ample time to reach set point after
making an adjustment. If pressure varies over 2
PSIor fluctuatesinconsistently, the controlshould
be replaced. See Section 17.
12.2 Once the control is properly adjusted at 27
PSI ± 1 PSI, place control knob on shaft. Turn
knob counterclockwise untiil knob reaches stop.
Now tighten knob to control shaft.
12.3 Turn Control Knob fully clockwise. allos
ample timer for vessel to cool and be controlled at
low set point. Pressure should drop to at least 15
PSI and control ±1 PSI. If Controller will not do
this, it should be replaced.
13.0 HEATINGELEMENTS: AutoclaveandDryer
Elements. Unplug unit from electrical outlet.
13.1 To test DryerElement (TopElement),remove
both wires from the Dryer Element terminals on
top of the vessel. Connect an Ohmmeter across
the two element terminals. The Dryer Element
should measure 11.5 ohms ± 0.6 ohms on 120V
Elementsor46ohms± 3 ohms on240V Elements,
if not, replace Element. See Section 18. Now
conduct test in Section 13.3.
13.2 To test Autoclave Heating Element (bottom
Element), remove bottom access cover and
remove both wires fromthe Heating Element
terminals. Connect an Ohmmeter across the two
Element terminals. The autoclave element should
measure 10.3 ohms ± .6 ohms on 120V Elements
or 41 ohms ± 3 ohms on 240V Elements. If not,
replace Element. See Section 18. Now conduct
test in Section 13.3.
13.3 Now select highest resistance range on
Ohmmeter. Touch one test lead to either terminal
on Element on touch other test lead to the vessel
body. This test will give an indication whether or
nottheElement is shorting toground.Donottouch
endsof testleadswith hands. Ifyouget anymeter
indication less than infinity, replace Heating
Element. See Section 18. Replace wires to
Element when test is completed.
14.0 DRYER TEMPERATURE CONTROL: This
isaninfinite control which variesthe'ON-OFF'rate
and current 'ON' time which is being supplied to
the Dryer Heating Element. The rate/time interval
is a function of the Dryer Control Setting.
14.1 The Dryer Temperature Control has 5 wire
connections labeled; P, L-1, L-2, H-1 and H-2.
Connections L-1 andL-2 arethepowerinputpoint.
Connections H-1 and H-2 are the power output
pointswhichleadtotheDryerElement.Connection
Psupplies power to the Dryer Pilot Light when the
Dryer Temperature Control is turned ON.
14.2 To test Dryer Temperature Control first test
Dryer Heating Element as in Section 13. Now turn
Timer, Power Switch and Function Switch 'ON'.
Connect an AC Voltmeter across the two Dryer
Temperature Control contacts labeled 'L-1' and
'L-2' to ensure power is present at Controller
inputs. If line voltage is not present, see Sections
3, 4, 5 and 6.

13
14.3 Now connect the AC Voltmeter across the
two Dryer Element terminals. With Dryer
Temperature Control 'OFF', no voltage should be
present and the Dryer Pilot Light should be out. If
voltage is present, replace Dryer Temperature
Control. Turn Dryer Temperature Control to 'LOW'
positionandobserve Voltmeter. Line voltageshold
be present for less than 5 seconds approximately
once every 25 seconds. Turn Dryer Temperature
Controlto'HIGH' positionn andobserveVoltmeter.
Line voltage shold be present for less than 5
seconds approximately once every 16 seconds. If
the above conditions are not met, replace Dryer
Temperature Control.
15.0 CHECKING FOR SYSTEM LEAKS: Unplug
unit form electrical outle. Move insulation away
from the copper tubing connections at the vessel
and Sensor so they may be observed during test.
15.1 Plug unit inot electrical outlet. Fill vessel to
proper water level, tighten door, turn Timer and
Power Switch 'ON', turn Function Switch to Dryer
'OFF'andturnAutoclaveTemperatureControl fully
counter clockwise. Allow unit to reach maximum
temperature and pressure.
15.2 Observe around door gasket, all fittins and
the Pressure Relief Valve for leaks. Also see
Sections 10.3 through 10.5.
15.3 If a door gasket leak cannot be stopped by
tightening door, it should be replaced. Replace
leakiyPressure ReliefValve.Iffittings areleaking,
unplug unit from electrical outlet and allow unit to
cool.
15.4 Tighten the leaking fitting up to 1/4 turn. DO
NOT tighten excessively, see Introductory
Information at beginning of Test Procedures. DO
NOT twist tubing when tightening. Use a second
tool to hold part from turning.
15.5 After repairing a leak, always retest unit in
Autoclave Cycle. If a repaired fitting leaks after
re-testing, it should be replaced. Order the
preformed copper tube sections with new
compression nuts, as necessary.
16.0 SENSOR ASSEMBLY REPLACEMENT:
Unplug unit from electrical outlet.
16.1 Remove the two wires from the Sensor
Switch.
16.2 Completely loosen the tube compression
fitting on top of the Sensor Body.
16.3 With the bottom access cover removed,
completely loosen the tube compression fitting
from the vessel and then remove the Sensor
Assembly.
16.4 Place new Sensor Assembly in positon.
Installnewcompressionnut over SensorTubeand
then inset tube into vessel fitting. Tube may have
to be bent slightly or vessel fitting turned to get
proper position. Tighten one complete turn after
finger tight. If retightening, turn nut 1/2 turn after
finger tight.
16.5 Retighten tube fitting from Solenoid Valve to
top of Sensor Body. Tighten 1/2 turn after finger
tight.
16.6 Replace black wire to 'COM' connection on
Sensor Switch. Replace orange wire to 'N.O.'
16.7 Test and adjust Sensor as per Section 8.
also check for leaks.
17.0 AUTOCLAVE TEMPERATURE CONTROL
REPLACEMENT: Unplug unit form electrical
outlet.
17.1 Remove black wires from T.B. Terminals #4
& #5, which lead to the controller.
17.2 Completelyloosenthe two compressionnuts
on the back of the Control. DO NOT bend tubing
more than necessary to clear Controller.
17.3 Loosen the two set screws on the control
knob and remove the knob.
17.4 Remove the nut from the Control knob stop
and then remove the Autoclave Temperature
Control.
17.5 Install new Control in Control Panel and
replace nut on Control knob stop.
17.6 Retighten the two tube compression nuts to
the back of the Controller.

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17.7 Connectthe bottom blackcontrolwireto T.B.
Terminal #4. Connect the top black wire to T.B.
Terminal #5.
17.8 Do not replace knob until adjusted properly.
Plug unit into electrical outlet. Fill vessel to proper
waterlevel,tightendoorand start Autoclave Cycle.
Nowproceed with AutoclaveTemperature Control
Adjustment per Section 12. Also check for fitting
leaks while unit is under pressure.
18.0 AUTOCLAVE AND DRYER ELEMENT
REPLACEMENT: Forthe AutoclaveElementyou
mustremovethe bottom access cover, shelf screw
and shelf.
18.1 Remove the nut, lockwasher and wire from
each Element terminal.
18.2 Removethe twolargenuts andlockwashers
which secure the Element to the vessel.

15
MAINTENANCE
19.0 CLEANING: Stainless steel will resist
corrosion;however,itisnotimpervioustoit. Proper
maintenance of the stainless steel bath chamber
will help assure many years of service. It should
be cleaned regularly with mild soapy water and
rinsed with distilled water. Should algae or other
undesirablemicroorganismsform on thetopofthe
bath media, add a little formaldehyde or zephiran
chloride to alleviate this problem.
CAUTION
AVOID SPILLING HARSH CHEMICALS ONTO
THE BATH AS CORROSION OF THE
STAINLESS STEEL MAY RESULT.
IMPORTANT
IFIT ISNECESSARYTOUSETHE FOLLOWING
CHEMICALS, LIMIT THE TIME TO A MAXIMUM
OF FOUR HOURS. CLEAN SURFACES
IMMEDIATELY AFTER USE.
-Aluminum Chloride -Barium Chloride
-Bichloride of Mercury -Calcium Chloride
-Carbolic Acid -Chlorinated Lime
-Citric Acid (boiling) -Dakin's Solution
-Ferrous Chloride -Mercury Salts
-LysolMercuric Chloride -Phenol
-Potassium Permanganate -Stanous Chloride
-Sodium Hypochlorite -Tartaric Acid
-Potassium Thiocyanate
CAUTION
NEVER USE THE FOLLOWING CHEMICALS.
-Aqua Regia -Ferric Chloride
-Iodine -Sodium Azide
-Sulfuric Acid
19.1RemovingDiscoloration: Should the stainless
steel ever become discolored by iron rust, use the
followingprocedureto remove alltracesofthe rust
and restore the stainless steel.
WARNING
OBSERVE THE FOLLOWING SAFETY
PRECAUTIONS! USE HEAVY GLOVES OR
OTHER ADEQUATE EYE PROTECTION. ONLY
WORK IN AREAS WITH ADEQUATE
VENTILATION.
Prepare a solution of 20% nitric and 1.5%
hydrochloricacid (if preferred,a2%to 5% solution
of warm oxalic acid may be used). Swab solution
over surface, allowing it to remain until all rust is
loosened. This will usually take 1 to 2 minutes.
Assoonasrustis loosened, immediately flushwith
clean water until all acid is removed. Dry
thoroughly.

16
POWER SWITCH
FUNCTION SWITCH
DRYER/AUTOCLAVE
DOOR GASKET WATER BAFFLE
SHELF
DRAIN VALVE
AND DRAIN
60 HOUR TIMER
INDICATOR LAMPS
AUTOCLAVE TEMP.
CONTROL
DRYER TEMP.
CONTROL