Thermo Scientific NESLAB EX Series General instructions

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Thermo Scientific
NESLAB EX Series
Bath/Circulator
ThermoScientificManualP/NU00696 Rev.03/06/07
Installation
Operation
Basic Maintenance

Thermo Fisher Scientific
25 Nimble Hill Road
Newington, NH 03801
Tel : [phone] or
[phone]
Fax : [phone]
www.thermo.com/tc
Statement of Copyright
Copyright©2007ThermoFisherScientific.Allrightsreserved.
This manual is copyrighted by Thermo Fisher Scientific.
Usersareforbiddentoreproduce,republish,redistribute,orresellanymaterialsfromthismanual
ineithermachine-readableformoranyotherform.
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info. [email protected]

- 1 -
Table of Contents
Preface
Compliance ..............................................................................................................2
WEEE/RoHS.............................................................................................................2
Unpacking ................................................................................................................2
After-sale Support....................................................................................................3
Warranty...................................................................................................................3
Feedback.................................................................................................................3
SectionISafety
Warnings ..................................................................................................................4
SectionIIGeneralInformation
Quick Reference Operating Procedures.................................................................6
Description...............................................................................................................7
Specifications ...........................................................................................................7
SectionIIIInstallationandOperation
Site ......................................................................................................................... 11
Electrical Requirements......................................................................................... 11
Plumbing Requirements ........................................................................................13
Tap Water Cooling Connections............................................................................14
Fluids .....................................................................................................................16
Filling Requirements..............................................................................................16
Controller (Digital One/Digital Plus) ......................................................................17
Start Up/Shut Down................................................................................................19
Setup/Tuning Loop ................................................................................................21
Controller (Digital Plus) .........................................................................................22
Computer Setup Loop ...........................................................................................24
Timer Setup Loop ..................................................................................................25
Offset Setup Loop..................................................................................................26
Analog A I/O Port - Optional...................................................................................27
High Temperature Cutout ......................................................................................28
Accessories............................................................................................................29
SectionIV BasicMaintenance
Reservoir Fluid ......................................................................................................35
Reservoir Cleaning ................................................................................................35
Algae ......................................................................................................................35
Internal Temperature Sensor (rtd1) Calibration ....................................................36
External Temperature Sensor (rtd2) Calibration ...................................................37
Optional Analog Port/Calibration - Optional ..........................................................38
SectionVTroubleshooting
Error Codes ...........................................................................................................39
External Sensor Connector ...................................................................................40
Checklist.................................................................................................................41
Service Assistance.................................................................................................42
Controller PID Values.............................................................................................42
BOM Decoder ........................................................................................................42
Displaying Software Version Number ....................................................................43
AppendixAFluids
AppendixBNCSerialCommunicationsProtocol
AppendixCInternationalQuickReferenceGuide
WARRANTY

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Preface
Compliance Listedto:
UL61010-12ndEdition
CSAC22.2#61010.12ndEdition
Productstestedand found to beincompliancewiththerequirementsdefinedin
theEMCstandardsdefinedby89/336/EECas well as Low Voltage Directive
(LVD) 73/23/EEC can be identified by the CE Mark on the rear of the unit. The
testinghasdemonstratedcompliancewiththefollowingdirectives:
LVD,73/23/EEC ComplieswithIEC/EN61010-1
EMC,89/336/EEC IEC/EN61326-1
Foranyadditionalinformation,refertotheDeclarationofConformitythat
shipped with the unit.
WEEE/RoHS This product is required to comply with the European Union’s Waste Electrical
& Electronic Equipment (WEEE) Directive 2002/96/EC. It is marked with the
followingsymbol:
ThermoFisherScientifichas contracted with one or morerecycling/disposal
companies in each EU Member State, and this product should be disposed of or
recycledthroughthem.FurtherinformationonThermoFisher Scientific’s
compliancewith these Directives,the recyclers inyour country,andinformation
on Thermo Scientific products which may assist the detection of substances
subjecttotheRoHSDirectiveareavailableat:www.thermo.com/WEEERoHS
Unpacking Retain all cartons and packing material until the unit is operated and found to
be in good condition. If the unit shows external or internal damage contact the
transportationcompany and filea damage claim.Under ICC regulations, this is
yourresponsibility.
Out of Box Failure
An Out of Box Failure is defined as any product that fails to operate in con-
formance with sellers published specifications at initial power up. The unit must
beinstalledinaccordancewithmanufacturer'srecommendedoperating
conditions within 30 days of shipment from the seller.
Any product meeting the definition of an Out of Box Failure must be packed and
shippedbackintheoriginalpackagingtoThermo FisherScientific forreplace-
ment with a new unit; Seller to pay the cost of shipping. Customer must receive
aReturnMaterialAuthorization(RMA)fromThermoFisherpriortoshippingthe
unit.

- 3 -
After-saleSupport Thermo Fisher ScientificCorporationiscommittedtocustomerserviceboth
duringandafterthesale.Ifyouhavequestionsconcerning the unitoperation,
contact our Sales Department. If your unit fails to operate properly, or if you
havequestionsconcerningsparepartsorServiceContracts,contactour
ServiceDepartment.Seethebacksideofthecoverforcontactinformation.
Beforecalling,pleaseobtainthefollowinginformation:
- unit BOM number_________________________________
- unit serial number ________________________________
-unitsoftwareversion ______________________________
-voltageofpowersource ____________________________
Theunit’sBOM number andserial number areprintedon the nameplate label
located on the rear of the unit. See page 42 for instructions on how to decode
your unit's BOM number. See page 43 for instructions on how to display the
softwareversion.
Warranty ThermoScientificNESLABEXunitshaveawarrantyagainstdefectiveparts
andworkmanshipfor 24 months fromdateof shipment. Seebackpage for
moredetails.
Feedback We appreciate any feedback you can give us on this manual. Please e-mail us
at[email protected].Besuretoincludethemanualpart
numberandtherevisiondatelistedonthefrontcover.
BOM#: XXXXXXXXXXXX
S/N: XXXXXXXXX
XXX VOLT XX HZ X PH X.X AMP

- 4 -
Section I Safety
Warnings Warningsarepostedthroughoutthemanual.Thesewarningsaredesignated
by an exclamation mark inside an equilateral triangle and text highlighted in
bold.Readandfollowtheseimportantinstructions.Failureto observe these
instructions can result in permanent damage to the unit, significant property
damage,orpersonalinjuryordeath.
Thelightningflashwitharrowsymbol,withinanequilateraltriangle,isintended
toalerttheusertothepresenceofnon-insulated"dangerous voltage" within
theunit's enclosure. The voltage may be ofsignificant magnitudeto constitute
a risk of electrical shock.
This label, engraved into the front of the tank lip, indicates the presence of hot
surfaces.
Makesure youread andunderstand allinstructions andsafety precautions
listedin this manual before installing or operating your unit. If you have any
questionsconcerning the operation of your unit or the information in this
manual,contactourSalesDepartment.
Performance of installation, operation, or maintenance procedures
other than those described in this manual may result in a hazardous
situation and may void the manufacturer's warranty.
Transport the unit with care. The units weigh approximately:
EX-7,27pounds(12kilograms);EX-10,32pounds(15kilograms);
EX-17,36pounds(16kilograms);EX-35,53pounds(24kilograms).Units
should be transported with equipment designed to lift these weights.
Observe all warning labels.
Never remove warning labels.
Never operate damaged or leaking equipment.
Never operate the unit without bath fluid in the bath.
The user is responsible for the fluid used. Never use pure ethylene
glycol as a bath fluid, the flash point of 100% ethylene glycol is 111°C.
100% ethylene glycol may produce flammable vapors that can be
ignited by an open flame or an ignition source. When mixed with
water, ethylene glycol is not flammable. Also, at high temperatures
pure ethylene glycol may produce hazardous vapors.
Always turn off the unit and disconnect the line cord from the power
source before performing any service or maintenance procedures, or
before moving the unit.
Always empty the bath before moving the unit.
Never operate equipment with damaged line cords.
Refer service and repairs to a qualified technician.

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Circuit
Breaker(s).
Reservoir. See page 16.
Controller. See page 17.
Section II General Information
Indicates the controller is
displaying the setpoint. Press
the arrow buttons to change the
value. See page 17.
Indicates the controller is
displaying the unit's low
temperature alarm setpoint.
Press the arrow buttons to
change the value. See page 17.
Indicates the controller is displaying
the high temperature alarm
setpoint. Press the arrow buttons
to change the value. See page 17.
Press to select the serial
communication mode.
See page 22. Digital Plus
controller only.
Press to change the
displayed value. See
page 17.
Press to start/stop the
unit. See page 17.
Press to mute the alarm. See
page 22. Digital Plus controller
only.
Press to sequence
through the three indicators
and accept the displayed
value. See page 17.
NOTE: None of the three
setpoint indicators are
visible unless this key is
pressed.
Indicates heater status.
See page 17.
Press to select external
sensor. See page 22. Digital
Plus controller only.
Press to select the timer
function. See page 23.
Digital Plus controller only.
Press to select the
temperature offset
mode. See page 23.
Digital Plus controller only.
1/8" OD Autorefill fluid
connection. See page 29.
1/4"MPTPumping
Return Connection. See
page 13.
Optional External Probe
Connector.Digital Plus
controller only. See page 40
.
1/4"MPTPumping
Supply Connection. See
page 13.
RS-232/RS-485
connections. See
Appendix B. Digital
Plus controller only.
Power connection.
See page 11.
Drain. See page 13.
High Temperature Cutout.
See page 28.
General Information
Autorefill connection.
Tap water cooling.
See page 14.
Analog Output
Connector.Digital
Plus controller only.
See page 27.

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Quick Reference Operating Procedures
Temperature Adjustment
Todisplay thetemperature setpoint, press on
thecontroller. The indicator willilluminate and
thedisplay will flash the current setpoint value. To
adjustthetemperaturesetpoint,pressthe arrow
buttons until the desired temperature setpoint is
indicated. Press again to confirm the change.
Thedisplaywillrapidlyflash the new value fora
short time and then return to the recirculating fluid
temperature.
Periodic Maintenance
Periodicallyinspectthereservoirfluid.Ifcleaningis
necessary,flushthereservoirwitha cleaningfluid
compatiblewithyourapplication.
Before changing the reservoir fluid ensure it is
at a safe handling temperature.
Installation
Locate the unit on a sturdy work area. Ambient
temperaturesshouldbe inside the rangeof+50°F to
+104°F(+10°Cto+40°C).Themaximumoperating
relativehumidity is80%.
Neverplacetheunitinalocation where excessive
heat,moisture,orcorrosivematerialsarepresent.
Makesurethe voltage of thepower source meets
thespecifiedvoltage,±10%.
Thepump connectionsare located at the rear of the
pump box and are labelled and . These
connectionsareangledupwardsotherecirculating
fluidwilldrainbackintothereservoirwhenthe
hosesare disconnected. Both connections are
capped with stainless steel serrated plugs.
Thepumplineshave¼"MPTformatingwith
standardplumbingfittings.Foryourconvenience
stainless steel adapters, ¼" FPT to 3/8" O.D.
serratedfitting,areprovided.
Thebathworkareahasahighandlowlevelmarker
toguide filling. The markers are 1 inch horizontal
slits located in the center of the stainless steel
baffleseparatingtheworkareaandthepump
assembly.Thecorrectfluidlevelfallsbetween
these two markers. The unit will not start if the fluid
level is below the lower slit.
Operation
Before starting the unit, double-check all electrical
and plumbing connections. Make sure the bath is
properlyfilledwithfluid.
To start the unit, press . To turn the unit off
press again.
The LED indicates the status of the heater. It
illuminates to indicate the heater is on.
General Information

- 7 -
Description TheThermoScientificNESLABEXBath/Circulatorsaredesignedtoprovide
temperaturecontrolforapplicationsrequiringafluidworkareaorpumpingtoan
external system.
Units consist of a circulation pump, seamless stainless steel bath, work area
cover,andamicroprocessortemperaturecontroller.
Specifications
ProcessFluid
Temperature Range2
Temperature Stability3
Pump Capacity4
Heater(Watts)
115V/60HzModels
230V/50HzModels
100V/50-60HzModels
Bath Work Area5
(W x L x D)
Inches
Centimeters
Bath Volume
Gallons
Liters
Weight6
Pounds
Kilograms
EX 7 EX10 EX17 EX 35
Ambient +12°C to +200°C
±0.01°C
General Information
1. Specifications subject to change.
2. Above 80°C, baths are tested with silicone oil. This fluid is known to release a formalde-
hyde vapor (which is carcinogenic) above 150°C.
3. 37°C, 45°C, 60°C bath temperature. 20°C ambient. Measured at the center of the work area,
stable ambient. Sea level. For 37°C the work area cover was off, for 45°C and 60°C the work
area cover was on. No external flow. For some applications, agitation and stability above
ambient may be improved by connecting a small length of hose between the pump connections
on the rear of the unit.
4. 20°C ambient. 20°C bath temperature using water. Pump fully loaded. Sea level.
5. See next page for additional dimensions.
6. Add approximately 3 pounds (1.4 kilograms) for shipping weight.
6 5/8x 7 x 6
16.8 x 17.8 x 15.2 8 ¾ x 8 1/8x 6 22.4 x 20.6 x 15.2 8¾ x 8 1/8x 9 22.4 x 20.6 x 22.9
1.9
7.2 3.0 11.3 4.8
18.1
8 ¾ x 15 ½ x 12
22.4 x 39.4 x 30.5
9.6
36.3
27
12.2 32
14.5 36
16.3 53 24.0
800 1600
2000 2000
800 1200
Pressure
Meters Feet
4.9 16
3.7 12
2.4 8
1.2 4
0.8 1.6 2.4 3.2 4.0 Gpm
3691215Lpm
Flow

- 8 -
UnitDimensions(inches)
General Information
B
A
C
1½
15/8
D
F
30° ½
105° 17/8
7/8
3¼
15/8
Rear View Side View
23/8
Time to Temperature
115V/60HzModels
UnitDimensions
Dimension A
Dimension B
Dimension C
Dimension D
CrateDimensions
(D x W x H)
EX7 EX10 EX17 EX35
14 5/8 14 5/8 17 5/8 20 5/8
9 1/4 11 3/8 11 3/8 11 3/8
19 19 3/4 19 3/4 26 7/8
8 3/8 8 3/8 11 3/8 14 3/8
26½ x 18 x 33½ 31¼ x 15½ x 26½

- 9 -
Time to Temperature
115V/60HzModels
230V/50HzModels
230V/50HzModels
General Information

- 10 -
BlankPage.

- 11 -
Section III Installation and Operation
Site AmbientTemperatureRange +50°Fto+104°F(+10°Cto+40°C)
MaximumOperatingRelativeHumidity 80%.
OvervoltageCategory II
PollutionDegree 2
Never place the unit in a location where excessive heat, moisture, or
corrosive materials are present.
Electrical
Requirements The unit construction provides protection against the risk of electrical
shock by grounding appropriate metal parts. The protection may not
function unless the power cord is connected to a properly grounded
outlet. It is the user's responsibility to assure a proper ground connec-
tion is provided.
Theuseris responsible toensure that thepowercord provided meetslocal
electricalcodes. If not, contact qualified installation personnel.
Theunit is intended for use on a dedicated outlet. The EX has an internal
circuit protection that is equivalent (approx.) to the branch circuit rating. This
is to protect the EX, and is not intended as a substitute for branch circuit
protection.
Power Cord Set
230 Volt, 50 Hertz units do not come with a power cord set, To select the
properpowercord,followtheseguidelines:
The cord set must consist of a plug, cable and receptacle.
If the unit is rated greater than 12 Amps, use a cord set rated for 20A.
If the unit is rated less than 12 Amps, use a cord set rated for 15A.
The cord set must be approved by local electrical authority or other
acceptable agency.
Ensure the plug is compatible with your local outlets and receptacles.
Refer to the serial number label on the rear of the unit to identify the specific
electricalrequirementsofyourunit.Ensurethevoltageofthepowersource
meetsthespecifiedvoltage,±10%.
Installation and Operation

- 12 -
Unit Type1Amperage Plug Type
115/60/1 15 NEMA5-15
115/60/1 20 NEMA5-20
100/50-60/1 15 NEMA5-15
100/50-60/1 20 NEMA5-20
230/50/1 All CountrySpecific
1. Average Amp draw.
1. Power cord length, if supplied, is 2 meters.
Thefollowingpoweroptionsareavailable:
Unit Amps1Breaker Power Inlet
EX7/10 115/60/1 9 15A IEC320-C-13
100/50-60/1 10 15A IEC320-C-13
230/50/1 10 15A IEC320-C-19
EX17/35 115/60/1 16 20A IEC320-C-19
100/50-60/1 16 20A IEC320-C-19
230/50/1 10 15A IEC320-C-19
Installation and Operation

- 13 -
Plumbing Requirements Ensure the unit is off before connecting tubing to the unit.
To prevent damage to the plumbing lines, always support the
fittings while installing/removing the pumping caps and lines.
HoseConnections
Thepumpconnectionsarelocated at the rearofthepumpbox and are labelled
(pumpoutlet)and (pumpinlet).Theseconnectionsarebentupward
sothe recirculating fluidwill drain backinto the reservoirwhen the hosesare
disconnected. Both connections are capped with stainless steel serrated plugs.
Thepumplineshave¼"MPT for mating with standardplumbingfittings.For
your convenience stainless steel adapters, ¼" FPT to 3/8" O.D. serrated fitting,
areprovided.(Toassure proper fit, theyshouldbe installed using 1½turnsof
Teflon®tapearoundthethreads.)
Makesurealltubing connections are securely clamped.Avoidrunning
tubing near radiators, hot water pipes, etc. If substantial lengths of tubing
are necessary, insulation may be required to prevent loss of cooling capacity.
TubingandinsulationareavailablefromThermoFisher.ContactourSales
Departmentformoreinformation(seePreface,After-saleSupport).
It is important to keep the distance between the unit and the external system
as short as possible, and to use the largest diameter tubing practical. Tubing
shouldbe straight and without bends. If diameter reductions must be made,
make them at the inlet and outlet of the external system, not at the unit.
Ifsubstantiallengths of linesarerequired, they shouldbepre-filled with bath
fluidbefore connecting them to the unit. This will ensurethat an adequate
amount of fluid will be in the bath once it is in operation.
Drain
Ensure the bath fluid is at a safe handling temperature before draining
the unit.
The unit is equipped with a drain located at the back of the unit labelled .
Todrain the reservoir attach a hose tothe barb and loosen the fitting. The
fitting has a stop to prevent it from coming off.
Pumping
Thepump is designed to deliver a flow of 15 liters per minute (4 gallons per
minute)at0 feet head.To prevent externalcirculation, the pumpinletand
outletlines on the rear of the unit are capped. The caps must be removed when
externalcirculationisrequired.
Toproperlysecureexternal hose connections totheunit, wrap Teflon®tape
aroundthepipeline threads before installation.Oncethehose connections are
made, the hoses must be properly plumbed to an external system. It is
important the bath is not in operation until all plumbing is complete.
Installation and Operation

- 14 -
Tap Water
Cooling Coils The unit is equipped with a cooling coil located behind the stainless steel baffle
in the bath, see page 5. The coil is useful for maintaining near-ambient tem-
peratures,orwhencoolingfromelevatedtemperatures.Temperaturestability
can also improve by circulating cold fluid through the coil. For best results, the
fluidshouldbeatleast5°Cbelowthetemperaturesetpoint. The requiredfluid
flow rate depends on the type of fluid, the setpoint, and the desired stability.
The plumbing connections for the cooling coil are 3/8inch OD stainless steel
tubes located on the lower rear of the unit. These connections will accept
3/8 inchor5/16 inchIDtubing.Tubingis available from Thermo Fisher.
Connect the cold fluid source to either fitting. Connect the other fitting to the
coldfluid return (or drain if tap water is being used).
Installation and Operation

- 15 -
Circulating to an open container
A stainless steel leveling device is available to aid circulation to an open
vessel.ContactourSalesDepartmentformoreinformation(seePreface).
Supportthelevelingdeviceovertheopencontainerwitharingstand.Stagger
the tubes in the leveling device so one tube is submerged in the vessel fluid,
and the other tube is level with the fluid surface. Connect the deeper tube to
the pump outlet and the shorter tube to the pump inlet.
Adjust the flow rate using the accessory flow control valve connected to the
pump outlet, or by partially restricting the outlet tubing. When properly
adjusted,thepumpinletwilldrawanoccasionalairbubbletopreventover
flow,and the pump outletwill force fluidthrough the submergedtube to
preventaerationofthevessel.
To avoid siphoning the bath work area when the unit is shut off, lift the
levelingdeviceoutofthevesselandabovetheleveloftheunit.
Circulatingthroughtwoclosed-loops
The pump can be used to circulate through two closed-loop systems. Connect
the shortest practical length of flexible tubing from the pump outlet to the inlet
of external system #1. Connect the outlet of system #1 directly into the bath
work area. Connect tubing from the bath work area to the inlet of system #2.
Connect the outlet of system #2 to the pump inlet.
Bath (Rear View) Open Container
Outlet Inlet
Levelling
Device
System #1
System #2
Bath
Work Area
PumpBox
Bath (Top View)
Installation and Operation

- 16 -
Fluids
The user is always responsible for the fluid used. Never use flammable
or corrosive fluids with this unit. The use of chlorine or sodium
hypochlorite in the baths will cause pitting that could damage the
heater coils.
Handling and disposal of liquids other than water should be done in
accordance with the fluid manufacturers specification and/or the MSDS
for the fluid us
Forfluidselectionconsiderapplicationrequirements,operatingtemperature
range,materialcompatibility,safetyconcerns,andenvironmental issues.
Wetted materials of bath include; 316 and 304 Stainless steels, Ryton® (PPS),
Teflon®(PTFE)andEthlyene-Propylenerubber(EPDM).
Deionized(upto18MOhmcm) and distilled waterarerecommendedto control
corrosionandalgaebloom.SeeWaterQualityStandardsandRecommenda-
tion in Appendix A.
Ethylene glycol and water, propylene glycol and water, silicone oil, and filtered
waterareacceptablefluids.SeeAppendixAforadditionalinformation.
Please callThermo Fisher customerservice todiscusshigh temperaturefluid
selections.However,we will oftenreferyou to chemical companiesspecializ-
inginheat transfer fluids.
Filling
Requirements Ensure the drain on the back of the unit is closed before filling the unit.
Thebathworkarea has a high andlowlevelmarker to guide filling.The
markers are 1 inch horizontal slits located in the center of the stainless steel
baffleseparatingtheworkareaandthepumpassembly.Thecorrectfluid
levelfallsbetweenthesetwomarkers.
NOTE:Theunitisequipped withareservoirlevelfloatswitch.Theswitch
prevents the unit from starting if the fluid is below the lower slit.
When pumping to an external system, keep extra fluid on hand to maintain
the proper level in both the circulating lines and the external system.
Avoid overfilling, fluids expand when heated.
Installation and Operation

- 17 -
Installation and Operation
Controller
(DigitalOne/DigitalPlus) ThecontrollercontrolstemperatureusingaProportional-Integral-Derivative
(PID)algorithm. It is designed with self-diagnostic features and easy to use
operatorinterface.Twocontrolleroptionsareavailable:DigitalOneandDigital
Plus.Theinformation on thefollowingtwo pages appliesto both controllers.
Theinformationonthefollowingtwopagesappliestobothcontrollers.
ON/OFF. Use this key to toggle the unit on or off and to clear error mes-
sages.
SCROLL . Use this key to scroll through the controller's LEDs. It is also
used to save new changes.
YES/ARROW. Use this key to increment numerical values when setting
valuesand toaccept new settings.
NO/ARROW. Use this key to decrement numerical values when setting
valuesand to abort new settings.
Indicates heater status. It illuminates to indicate the heater is adding heat from
thebath fluid. The indicator is off whenheat is not being added.
DigitalOneController
Yes
No

- 18 -
NOTE: Thefollowing indicationsare not visible until is depressed.
Setpoint. Indicates the controller is displaying the current setpoint.
Low Temperature Alarm. Indicates the controller is displaying the current
lowtemperaturealarm.
High Temperature Alarm. Indicates the controller is displaying the current
hightemperaturealarm.
Toadjustthedisplayed value usethearrow buttons. Pressing anarrowbutton
will cause the display to stop flashing and to indicate the new setpoint value.
SavethechangebypressingSCROLL.Thenewsetpointvaluewillrapidlyflash
fortwocycles and thenthe controller willreturn to the reservoirfluid tempera-
ture display.
If SCROLL is not pressed within 60 seconds the change will time out and revert
totheoriginalsetpoint. The controllerwillautomaticallyreturn to thereservoir
fluidtemperaturedisplay.
NOTE: Youcan notadjust the setpoint closer than 0.1°C of either temperature
limit, and you can not adjust either temperature limit within 0.1°C of the
setpoint. Trying to do so will cause the indicator to flash and, on Digital Plus
controllers, the alarm to beep.
On units with the Digital Plus controller, pressing the Mute button prior to
pressingSCROLLwillabort anychangesandreturntothereservoirfluid
temperaturedisplay.
Installation and Operation