CSZ MICRO-TEMP LT 749 User manual

MICRO-TEMP LT
Operation and Technical Manual
Model 749 Localized Therapy Units
Cincinnati Sub-Zero Products, LLC. 12011 Mosteller Road Cincinnati, Ohio 45241, U.S.A.
www.cszmedical.com


OPERATION AND TECHNICAL MANUAL MICRO-TEMP®LT, Model 749
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MICRO-TEMP®LT, MAXI-THERM®, MAXI-THERM®LITE, PLASTIPAD®, GELLI-ROLL®, and
TEMP-PAD® are registered trademarks of Cincinnati Sub Zero Products, LLC., Cincinnati, Ohio
USA.
©Copyright 2016, Cincinnati Sub-Zero Products, LLC. All rights reserved.
Manual 57203 Rev. V
ECN: M1906-5627

OPERATION AND TECHNICAL MANUAL MICRO-TEMP®LT, Model 749
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MICRO-TEMP®LT Symbols / Definitions
Temperature Set
Low Water Level
Water
Temperature
Temperature Set
Point Indicator
Increasing
Temperature
Decreasing
Temperature
OFF / ON Switch
O / I
CAUTION
AC Voltage
Power Failure
Fuse
~
Risk of Explosion:
Do not use in the
Presence of Flammable
Anesthetics
Disconnect Power Before
Servicing
Danger; Risk of
Electric Shock
Separate Disposal for Electrical
/ Electronic Equipment
Attention: Read
Operation Instructions
and Manual Before
Operating
ESD
Susceptibility
Type BF
Equipment
Equipotentiality
Earth (Ground)
INCREMENT
(Increase
Temperature)
DECREMENT
(Decrease
Temperature)
Temperature Set
Display
Celsius

OPERATION AND TECHNICAL MANUAL MICRO-TEMP®LT, Model 749
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MICRO-TEMP®LT
OPERATION AND TECHNICAL MANUAL
Cincinnati Sub-Zero Products, LLC., reserves the right to make equipment changes and improvements, which
may not be reflected in this manual.
WARNING
Failure to properly monitor patient may result in serious injury or death.
A physician's order is required for setting blanket temperature and use of equipment. At least every
20 minutes, or as directed by physician, check patient's temperature and skin integrity of areas in
contact with blanket; also, check the Micro-Temp® LT’s water temperature. Pediatric patients,
temperature-sensitive patients with vascular disease, surgical patients, diabetics and patients with
Raynaud’s Disease are at greater risk for developing tissue injuries, and this should be considered
when selecting the temperature, duration of therapy and frequency of skin checks. Notify the
physician promptly of any change in patient status in order to avoid serious injury or death.
If device is used at home, patient must follow directions prescribed by their physician and be aware
of all warnings and cautions mentioned throughout the manual. Failure to do so may result in
patient injury.
Thermal injury may occur if heating/cooling blankets are used with a patient with an ischemic
limb.
Observe patient’s skin condition frequently due to individual differences in sensitivity and
susceptibility to injury from heat and/or externally applied chemicals or pressure. Patients at
greatest risk are those unconscious, on prolonged therapy, diabetics, children, and persons
incapacitated, with sensitive skin areas, or poor circulation. Failure to do so may result in
patient injury.
Do not use for ECMO (Extracorporeal Membrane Oxygenation) therapy as patient injury
may occur.
The method of temperature control provided by all localized heat therapy units presents the danger
of heating body tissues, particularly the skin, to a point where they are injured, i.e., burns. The
clinician is responsible for determining the appropriateness of the temperature limits in
dependency to time. Exceeding 40°C water temperature for extended periods can cause tissue
damage and burns. Clinical judgment should be used to determine the safe maximum contact
periods based on patient age, clinical condition, and current medications. Depending on the
extent and severity of a burn, very serious complications may arise.
Prevent excessive and/or prolonged tissue pressure and shearing forces, especially over bony
prominences. Failure to do so may result in tissue injury.
Do not wrap pad so tightly as to constrict blood flow. Patient injury may result.
Do not use pins to secure pad or hoses. Do not allow pad or hoses to come in contact with any
sharp object. Water leak may occur, and water leaks could lead to electric shock and/or
infection.
Do not place additional heat sources between the patient and pad. Skin damage may result.
Improper repair and inadequate maintenance can result in damage to the MICRO-TEMP®LT
system and patient injury.
Any time water is found leaking into or around the unit, connecting hose, and/or pad, turn the unit
off, disconnect the power cord from its power source, and correct the problem before proceeding.
Proper maintenance procedures should be followed including, but not limited to, the preventative
maintenance described in this manual. Leaky blankets or hoses should never be used. Water
leaks could lead to electric shock.

OPERATION AND TECHNICAL MANUAL MICRO-TEMP®LT, Model 749
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WARNING
Leaky pads or hoses, as well as unapproved pads should never be used. Water leaks present
a risk of infection and should be handled accordingly.
Do not use the MICRO-TEMP®LT system in the presence of flammable anesthetics. Risk of
explosion can result.
For continued protection against risk of fire, replace only with same type and rating of fuse.
Electrical hazards may result.
This device is still energized when the inlet switch is in the off position. To completely
disconnect the device from the power source, remove the appliance plug from the back of the
unit. Electrical hazards may result.
Always unplug the unit before accessing internal components during service. Failure to unplug
the unit could result in electric shock.
Do not by-pass ground on power cord plug. Electrical Hazards may result.
Working with electronic boards, plugs, and cables requires delicate handling. Proper
Electrostatic Discharge (ESD) procedure should be followed during replacement of any
electronic board.
Use only CSZ provided hospital grade power cord assembly and used in conjunction with
a properly grounded receptacle or electric shock may result.
Do not position unit near any objects that can generate a strong electrical/magnetic field. If
interference is observed, re-locate the unit away from such devices. Potential electromagnetic
interference may result.
Keep air vents free of debris and obstruction. Keep unit, specifically the air vents, away from
curtains or other obstructions. Blockage of vents could result in the unit overheating which
could render the unit unable to provide adequate therapy and excessive surface
temperatures could cause injury of patient or operator.
Remove the MICRO-TEMP®LT from service if the outer casing or membrane control panel is
cracked or internal components are exposed. Contact with internal components could result
in electric shock or thermal injury to the patient or operator and exposure to sharp edges.
Before returning the MICRO-TEMP®LT to patient use after repairs, the MAINTENANCE
CHECKLIST in Section 4 must always be performed. Improper repair and inadequate
maintenance can result in system damage and patient injury.
The repair, calibration, and servicing of the MICRO-TEMP®LT should be performed by qualified
Medical Equipment Service Technicians, Certified Biomedical Electronics Technicians, or
Certified Clinical Engineers familiar with good repair practices for servicing medical devices, and
in accordance with instructions contained in this manual. Improper repair can result in system
damage and patient injury.
ALL ground wires must be connected. Improper grounding may result in electric shock.
The warming of transdermal medications (patches) can increase drug delivery, resulting in
possible injury to the patient.
To avoid risk of electric shock, this equipment must only be connected to a supply mains with
protective earth.
Do not use the Micro-Temp®LT system distal to arterial cross clamping. Thermal injury may
result.
Proper sanitation procedures must be practiced and hygienic safety must be maintained, to
prevent contamination. Contamination can affect patient’s health, i.e. skin irritation/rash or sepsis
and infection may result.
Materials of good thermal conductivity, such as water, gel and similar substances on the blanket,
with the MICRO-TEMP®LT not switched on may decrease the temperature of the patient.

OPERATION AND TECHNICAL MANUAL MICRO-TEMP®LT, Model 749
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WARNING
Placing materials with high insulation properties (pillows, etc.) between the heated pad and the
patient may reduce therapy to the patient.
Complete folding of pad may restrict flow and reduce therapy to patient.
CAUTION
Federal law restricts this device to sale by or on the order of a licensed healthcare professional.
(US)
Always drain the MICRO-TEMP®LT to a sanitary drain because bio-contaminants may be
present in the unit’s water supply.
Do NOT fill the reservoir to the bottom of the strainer if there is water in the pad. This could cause
an overflow when the unit is turned on.
Do not operate pump without a pad connected or with pad clamps in the “CLOSED” position.
Always check clamps to make sure they are fully open.
The pad surface should be checked for freedom from mechanical damage prior to each
application.
Make sure hose and pads are free of kinks that might restrict flow.
Check hose couplings to be certain they are properly locked together.
Follow pad instructions and Hospital/Physician instructions for applying, storing, and disposal of
product.
Do not use alcohol. Alcohol may cause pad and unit deterioration.
Use distilled water only. Do Not Use De-Ionized water or tap water. Failure to use distilled
water may result in poor performance and damage to the MICRO-TEMP®LT.
For safe handling and use of chemicals, follow manufacturer guidelines. Users should not use
cleaning or decontamination methods different from those recommended by CSZ without first
checking with CSZ that the proposed methods will not damage the equipment.
The display may blank momentarily during an electrostatic discharge (ESD) event, but the
essential performance of the unit is not affected and no harm will occur to the patient. If an
electrostatic discharge (ESD) event occurs, check to see if unit is operating properly. If unit does
not return to previous operation, turn unit off then back on and reset temperature settings as
prescribed.
If a means is needed in retaining a patient either on or under a CSZ Hyper-
Hypothermia Blanket or the Connecting Hose, the means should not block the fluid
pathways of the MICRO-TEMP®LT unit.
No modification of this equipment is allowed without prior, written authorization from CSZ.

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Table of Contents
TABLE OF CONTENTS ..................................................................................................................................7
BEFORE YOU CALL FOR SERVICE ...........................................................................................................10
IN-WARRANTY REPAIR AND PARTS.........................................................................................................10
RECEIVING INSPECTION ............................................................................................................................10
IMPORTANT SAFETY INFORMATION........................................................................................................10
1-0. GENERAL SAFETY PRECAUTIONS ..............................................................................................11
1-1. GENERAL DESCRIPTION OF THIS MANUAL................................................................................11
1-2. GENERAL DESCRIPTION OF THE MICRO-TEMP®LT SYSTEM ..................................................11
1-3. PHYSICAL DESCRIPTION OF THE MICRO-TEMP®LT UNIT..............................................................12
1-3.1. EXTERNAL FEATURES - FRONT VIEW ............................................................................12
1-3.2. EXTERNAL FEATURES - REAR VIEW ..............................................................................14
1-3.3. EXTERNAL FEATURES –MEMBRANE CONTROL PANEL .......................................16
1-4. REQUIRED ACCESSORIES .................................................................................................................18
1-5. FUNCTIONAL DESCRIPTION OF THE MICRO-TEMP®LT SYSTEM...................................................18
1-5.1. THEORY OF OPERATION ..................................................................................................18
1-5.2. HEATING SYSTEM..............................................................................................................18
1-5.3. CIRCULATING SYSTEM .....................................................................................................18
1-5.4. TEMPERATURE SAFETY CONTROL SYSTEM ................................................................19
SECTION 2. GENERAL PREPARATION OF THE MICRO-TEMP®LT SYSTEM.......................................20
2-1. INTRODUCTION...............................................................................................................................20
2-2. UNPACKING THE SHIPMENT.........................................................................................................20
2-3. FIRST TIME SET-UP/SYSTEM TEST ROUTINE .............................................................................20
2-3.1. INSPECTING AND ARRANGING THE EQUIPMENT.........................................................20
2-3.2. COMPLETING A SYSTEM TEST ROUTINE.......................................................................21
2-4. UNIT AND PATIENT RELATED PRECAUTIONS............................................................................23
2-5. PATIENT PREPARATION AND BEDSIDE CARE...........................................................................23
SECTION 3. OPERATING THE MICRO-TEMP®LT UNIT...........................................................................25
3-1. INTRODUCTION...............................................................................................................................25
3-2. ARRANGING THE SYSTEM COMPONENTS..................................................................................25
3-3. OPERATING THE MICRO-TEMP®LT SYSTEM ..............................................................................27
3-4. CONCLUDING LOCALIZED HEAT THERAPY TREATMENT ........................................................28
3-5. STATUS DISPLAY AND INDICATOR MESSAGES ........................................................................29
SECTION 4. GENERAL MAINTENANCE OF THE MICRO-TEMP®LT SYSTEM......................................31
4-1. INTRODUCTION...............................................................................................................................31
4-1.1. TEST EQUIPMENT REQUIRED.....................................................................................31
4-2. MAINTENANCE OF THE WATER RESERVOIR .............................................................................33
4-2.1. DRAINING THE RESERVOIR..............................................................................................33
4-2.2. REPLENISHING THE RESERVOIR ....................................................................................33
4-2.3. DISINFECTION/DRY STORAGE PROCEDURE FOR CIRCULATING WATER UNITS..34
4-3. MAINTENANCE OF THE MICRO-TEMP®LT UNIT EXTERIOR –CLEANING INSTRUCTIONS...........................36
4-4. DISPOSAL OF THE LOCALIZED HEAT THERAPY PADS.............................................................36
4-5. CURRENT LEAKAGE TEST...............................................................................................................36
4.6 GROUND CONTINUITY TEST...............................................................................................................37
4.7 FLOW RATE TEST.................................................................................................................................37
4.8 >1°C (2°F) OVER SET POINT CHECK..................................................................................................38
4.9 TEMPERATURE ACCURACY CHECK.................................................................................................38
4.10 HIGH LIMIT SAFETY CHECK..............................................................................................................39
4.11 LOW WATER INDICATOR CHECK.....................................................................................................39
4.12 POWER FAILURE INDICATOR CHECK.............................................................................................40

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4.13 TILT SWITCH INDICATOR CHECK.....................................................................................................41
SECTION 5. FIELD REPAIR/SERVICE OF THE MICRO-TEMP®LT UNIT................................................41
5-1. INTRODUCTION...............................................................................................................................42
5-2. ACCESS TO THE INTERIOR OF THE MICRO-TEMP®LT UNIT .........................................................44
5-2.1. SEPARATING THE FRONT AND REAR ENCLOSURES ..................................................44
5-2.2. RECONNECTING THE FRONT AND REAR ENCLOSURES.............................................44
5-2.3. DISCONNECTING THE CABLES FROM THE CONTROL BOARD ..................................45
5-2.4. DISCONNECTING THE CABLES FROM THE DISPLAY BOARD.....................................45
5-3. REPLACEMENT OF THE HEATER......................................................................................................46
5-4. REPLACEMENT OF THE PUMP..........................................................................................................47
5-5. REPLACEMENT OF THE RESERVOIR...............................................................................................49
5-6. REPLACEMENT OF THE TWIN BLACK TUBING...............................................................................50
5-7. REPLACEMENT OF THE WATER TEMPERATURE SENSOR (THERMISTOR)................................50
5-8. REPLACEMENT OF THE I/O POWER SWITCH..................................................................................51
5-9. REPLACEMENT OF FUSES IN THE I/O POWER SWITCH.................................................................53
5-10. REPLACEMENT OF THE WATER LEVEL SENSOR ASSEMBLY....................................................53
5-11. REPLACEMENT OF THE CONTROL BOARD AND/OR DISPLAY BOARD AND/OR THE
MEMBRANE CONTROL PANEL ..................................................................................................................55
5-12. TROUBLESHOOTING GUIDE............................................................................................................57
SECTION 6. PARTS INFORMATION ..........................................................................................................62
6-1. INTRODUCTION....................................................................................................................................62
6-2. ORDERING INFORMATION FOR REPLACEMENT PARTS...............................................................62
6-3. RECOMMENDED REPLACEMENT PARTS INVENTORY..................................................................62
6-4. RETURNING PARTS UNDER WARRANTY.........................................................................................63
6-5. SHIPPING PARTS ................................................................................................................................63
SECTION 7. SPECIFICATIONS AND CERTIFICATIONS OF THE MICRO-TEMP®LT.............................70
WORLDWIDE ORDER PLACEMENT...........................................................................................................75

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Table Of Figures
Figure 1-1 Micro-Temp®LT –Front View ................................................................................................................ 13
Figure 1-2 Micro-Temp®LT –Rear View.................................................................................................................. 15
Figure 1-3 Micro-Temp®LT –Membrane Control Panel (100V/115V Only) ............................................................. 17
Figure 1-4 Micro-Temp®LT –Membrane Control Panel (230V/240V Only) ............................................................. 17
Figure 5-1 Micro-Temp®LT –Exposed Rear View .................................................................................................... 43
Figure 6-1 Micro-Temp®LT Internal Exploded - Front View .................................................................................... 64
Figure 6-2 Micro-Temp®LT - Parts List A ................................................................................................................. 64
Figure 6-3 Micro-Temp®LT –Internal Exploded –Rear View .................................................................................. 65
Figure 6-4 Micro-Temp®LT - Parts List B ................................................................................................................. 65
Figure 6-5 Micro-Temp®LT Reservoir –Side View .................................................................................................. 66
Figure 6-6 Micro-Temp®LT - Parts List C ................................................................................................................. 66
Figure 6-7.A Micro-Temp®LT Electrical Wiring Diagram –100V/115V .................................................................... 67
Figure 6-7.B Micro-Temp®LT Electrical Wiring Diagram –230V/240V .................................................................... 68
Figure 6-8 Micro-Temp®LT Accessories .................................................................................................................. 69
Table 1 Guidance and Manufacturer’s Declaration – Electromagnetic Emissions.................................................... 72
Table 2 Guidance and Manufacturer’s Declaration – Electromagnetic Immunity .................................................... 72
Table 3 Guidance and Manufacturer’s Declaration– Electromagnetic Immunity that is not used for Life Support .. 73
Table 4 –Recommended Separation Distances Between Portable and Mobile RF Communications Equipment and
the Micro-Temp®LT, Model 749............................................................................................................................. 74

TECHNICAL HELP MICRO-TEMP®LT, Model 749
OPERATION AND TECHNICAL MANUAL
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TECHNICAL HELP
United States and Canada
Cincinnati Sub-Zero Products, LLC. Toll Free 1-800-989-7373
12011 Mosteller Road (U.S.) 24hr Clinical Support 1-513-460-2038
Cincinnati, OH 45241 Fax [phone]
www.cszmedical.com
BEFORE YOU CALL FOR SERVICE
To help us better serve you, please have the serial number of your MICRO-TEMP®LT unit ready
when you call for parts or service. The serial number is located on the specification label attached
to the unit’s rear panel.
How to read serial numbers:
Example: 121-LT-60000
12 indicates a manufacturing date of the year 2012
1 indicates the quarter (first)
-LT- means MICRO-TEMP®LT, Model 749
60000 indicates that this is the 60,000th unit of a certain model
IN-WARRANTY REPAIR AND PARTS
All parts on your MICRO-TEMP®LT unit are covered by a one year warranty (parts and labor if
returned to CSZ). To return defective parts or units, first obtain a Returned Materials
Authorization (RMA) number from our Medical Technical Service department.
RECEIVING INSPECTION
After unpacking the MICRO-TEMP®LT System, be sure to inspect the system for concealed
damage. Retain all packing material and carefully describe or photograph any damage. Notify
the carrier at once and ask for an inspection (in writing). Failure to do this within 15 days may
result in loss of claim. Do not return the equipment to Cincinnati Sub-Zero. Call our Medical
Technical Service department for further instructions.
IMPORTANT SAFETY INFORMATION
Refer to this manual for instructions and caregiver information. Read and understand all
precautionary information before using, prescribing, or servicing the MICRO-TEMP®LT unit.

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OPERATION AND TECHNICAL MANUAL
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SECTION 1. INTRODUCTION
1-0. GENERAL SAFETY PRECAUTIONS
To provide the patient maximum safety during the use of the MICRO-TEMP®LT localized heat
therapy system, a thorough knowledge and understanding of the system and its correct
application and operating use are required. Each person who is responsible for use or direction
of use of the system, such as physicians, nurses, technicians and operators must read and
understand this operating manual and all precautions and warnings prior to use. It is
recommended this manual be reviewed at least semi-annually as a refresher to ensure safe
operation and application. For proper knowledge and understanding, health care facility in-
service is available upon request.
1-1. GENERAL DESCRIPTION OF THIS MANUAL
This manual describes the operation, maintenance, and service of the MICRO-TEMP®LT localized
heat therapy system. Section One describes the physical and functional characteristics of the
MICRO-TEMP®LT System. Section Two explains how to prepare the MICRO-TEMP®LT unit for
general use. Section Three expresses how to operate the unit. Section Four describes the regular
maintenance of the MICRO-TEMP®LT unit. Section Five explains Field Repair and Service of the
MICRO-TEMP®LT unit and contains a troubleshooting guide. Section Six outlines parts
information, and Section Seven lists the specifications of the MICRO-TEMP®LT unit.
All individuals who use, operate, or service the unit should be familiar with all parts of this manual.
However, Sections One and Two are primarily intended for personnel who unpack and setup the
unit. Section three is primarily intended for personnel who operate the unit, and Sections Four
through Six are primarily intended for personnel who service and repair the unit. Section (1-4)
describes the external features of the MICRO-TEMP®LT unit and Section (3-5) describes the
indicator messages.
1-2. GENERAL DESCRIPTION OF THE MICRO-TEMP®LT SYSTEM
Intended Use
The CSZ MICRO-TEMP®LT Model 749 Localized Heat Therapy System is intended to warm a
patient's body part through conductive heat transfer. The conductive heat therapy is provided by
circulating warm water through localized temperature therapy pads. The CSZ MICRO-TEMP®LT
unit is composed of a heater, a circulating pump, and a microprocessor. The MICRO-TEMP®LT
is intended for use by appropriately trained healthcare professionals in healthcare facilities and in
home care environments.

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OPERATION AND TECHNICAL MANUAL
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1-3. PHYSICAL DESCRIPTION OF THE MICRO-TEMP®LT UNIT
See Section 7 for specifications and certifications of the MICRO-TEMP®LT.
1-3.1. EXTERNAL FEATURES - FRONT VIEW
The external features in Figure 1-1 of the MICRO-TEMP®LT unit are described as follows:
A. The membrane on the front of the unit allows the user to change the temperature of
the water flowing through the thermal pad. It displays error messages and sounds an
audible indicator if there is a problem with the device. Refer to Section 1-3.3 for
descriptions of controls on the membrane. Refer to Section 3-5 for the list of status
displays and indicator messages.
B. The air vents, on both the top and bottom of the unit, provide air circulation for the
control board.
C. The built in handle permits the operator to grip and pick up the unit when moving it.
D. The sight window allows the operator to visually see how much water is in the
reservoir.
E. The permanently attached hose connects the unit and the thermal pad.
F. The four rubber suction cups on the bottom of the unit help to prevent the unit from
tipping.
G. The coupling attached to the end of the twin black tubing allows a quick disconnect
for the heat therapy pad.
H. The skirt is used to help prevent leaks from the reservoir

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OPERATION AND TECHNICAL MANUAL
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Figure 1-1 Micro-Temp®LT Unit –Front View
H

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OPERATION AND TECHNICAL MANUAL
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1-3.2. EXTERNAL FEATURES - REAR VIEW
The external features in Figure (1-2) of the MICRO-TEMP®LT unit are described as follows:
A. The power switch is a beveled rocker switch labeled “I” for ON and “O” for OFF.
B. The fuse housing holds replaceable fuses that are integrated in the switch assembly to
protect against overload conditions.
C. The main power connection is where the detachable power cord connects.
D. The detachable power cord with a hospital grade plug should only be inserted into a
properly grounded receptacle. Electrical specifications are described in Section (7).
E. The water fill opening, secured with a reservoir cap, is where the operator pours
distilled water into the unit to fill the reservoir.
F. The specification label outlines the MICRO-TEMP®LT unit's electrical requirements.
The condensed operating instructions found on the 115V allow the operator to see the
instructions and appropriately use the unit. The 230V contains symbols to describe
how to appropriately use the unit. The specification label also includes the unit serial
number and model number.
G. The recessed bottom is used to secure and store the permanently attached hose
and/or the power cord by wrapping the hose and/or cord around the unit when it is not
in use.
H. The equipment grounding terminal is used to perform the ground continuity test.
I. The skirt used for preventing leaks from the reservoir

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OPERATION AND TECHNICAL MANUAL
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Figure 1-2 Micro-Temp®LT Unit –Rear View
I

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OPERATION AND TECHNICAL MANUAL
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1-3.3. EXTERNAL FEATURES –MEMBRANE CONTROL PANEL
The external features in Figure (1-3) and Figure (1-4) of the MICRO-TEMP®LT unit are described
as follows:
A. The digital temperature display shows the actual temperature of the circulating water
and the set point temperature when the “SET” button is depressed. It also displays
indicator messages when a problem occurs, alerting the operator to make a change.
Refer to Section (3-5) for a list of possible display messages and indicators.
B. The “Low Water” symbol indicates when the unit is low on water by illuminating the
yellow LED to the left of the symbol. Refer to Section (3-5), Step (B) for Low Water
indicator.
C. The “Power Fail” symbol indicates when power has been interrupted by flashing the red
LED to the left of the symbol and sounding an audible indicator. Refer to Section (3-
5), Step (B) for Power Failure.
D. The “Caution” symbol indicates when the water temperature is >1°C (2°F) over the set
point temperature, the water has reached the high limit temperature of 44°C (111° F),
the tilt of the unit is beyond approximately 20˚in any direction, or when there is a fault
within the unit by flashing/illuminating the red LED to the left of the symbol and
sounding an audible indicator. Refer to Section (3-5), Step (B).
E. The Increment button is used to increase the set point temperature when needed.
F. The “SET” temperature button is used to position the set point temperature.
G. The Decrement button is used to decrease the set point temperature when needed.
H. The “°C” button allows the operator to select Celsius as the measurement scale by
which the unit functions (100V and 115V only).
I. The “°F” button allows the operator to select Fahrenheit as the measurement scale by
which the unit functions (100V and 115V only).

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OPERATION AND TECHNICAL MANUAL
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Figure 1-3 Micro-Temp®LT Unit –Membrane Control Panel (100V/115V Only)
Figure 1-4 Micro-Temp®LT Unit –Membrane Control Panel (230V/240V Only)

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OPERATION AND TECHNICAL MANUAL
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1-4. REQUIRED ACCESSORIES
The only essential accessory for the MICRO-TEMP®LT unit is a thermal pad. They are available in
a variety of sizes. The maximum thermal pad allowed for the MICRO-TEMP®LT is 25” x 19”.
The thermal pad is connected to the unit via the permanently attached eight foot (2.4 meter) hose
with “quick-connect” couplings, featuring automatic shut-offs on the end of each hose. The
automatic shut off pertains to the hose only, and therefore the clamp for the blankets/pads must be
shut to avoid water leakage.
A list of MICRO-TEMP®LT System Equipment and accessories are found in Figure (6-8).
1-5. FUNCTIONAL DESCRIPTION OF THE MICRO-TEMP®LT SYSTEM
1-5.1. THEORY OF OPERATION
The MICRO-TEMP®LT System utilizes a linear temperature controller featuring a digital read-out
of water and set point temperature (selectable to indicate Celsius or Fahrenheit for 100V and
115V only), and operates between a temperature range of 20°C to 42°C (68°F to 107°F). In
addition, this model includes audible indicators and visual indicators for power failure and warning
indicators, along with a visual indicator for low water. Safety features include: linear control to
ensure accuracy of temperature setting at all times by eliminating the need for calibration; digital
display of actual water temperature as well as set point temperature; a low water cut-off switch
which shuts off both the heater and circulating pump; an independent high limit sensor to guard
against possible over-heating and subsequent patient injury; and a tilt switch indicator which
sounds and shuts the unit off when tilted more than approximately 20° in any direction from the
horizontal plane.
1-5.2. HEATING SYSTEM
The MICRO-TEMP®LT heating system consists of an immersion heater, a water temperature
control, and two high temperature safety devices. Temperature ranges of the system are described
in Section (1-6.4). The immersion heater is located in the reservoir. The water circulating in the
reservoir flows around the immersion heater and is warmed by conductive heat transfer.
The heating system is operational whenever the control system calls for an increase in the
temperature of the circulating water. It is important to note that the rate of change in the circulating
water temperature is not directly proportional to the rate of change in the temperature of the patient.
1-5.3. CIRCULATING SYSTEM
The MICRO-TEMP®LT circulating water system is composed of a magnetically driven circulating
pump, a single self-contained reservoir, a connecting hose, quick-disconnect fittings, and a localized
heat therapy pad.
The 0.24-gallon (0.9 liters) capacity reservoir is composed of a single circulating unit.

INTRODUCTION MICRO-TEMP®LT, Model 749
OPERATION AND TECHNICAL MANUAL
Page 19 of 75
The circulating water flows over and around the heating element and water temperature sensor
located in the circulating reservoir. The heated water then flows out of the reservoir, to the
circulating pump, through the pump housing and connecting hoses, and then to the localized heat
therapy pad. The water circulates through the pad and returns to the unit to be reheated and
recycled.
In addition, the reservoir contains a low water level sensor which shuts down the heater and pump,
and illuminates the Low Water LED if the water level drops below a preset amount. The unit
becomes operational only after the water level is restored to normal.
1-5.4. TEMPERATURE SAFETY CONTROL SYSTEM
The MICRO-TEMP®LT unit is designed to carefully measure and control the temperature of the
circulating water. It is engineered so that when the temperature of the circulating water reaches the
desired set point, the heater cycles in order to maintain the set point temperature.
As a safety precaution, the MICRO-TEMP®LT unit has a >1°C (2°F) over set point indicator and a
high temperature indicator.
Each safety device continuously monitors the temperature of the circulating water. As an additional
precaution, if the water temperature sensor itself should fail, the unit shuts down and the display
indicates EE05. With this safety design, both the patient and the unit are protected from injury or
damage caused by extreme temperatures.
NOTE: The operator must regularly monitor the patient whenever localized heat therapy is used.
SAFETY CONTROLS FOR PROTECTION FROM HIGH TEMPERATURE
The circulating water reaches 42.0°C 0.5°C (107°C 1°F), and a microprocessor controls the set
point.
If the circulating water reaches 44°C 0.5°C (111°F 1°F), a safety device shuts off the heater and
pump, the display alternates between flashing the actual water temperature and flashing “HL,” an
audible indicator continuously sounds, and the red “Power Failure/Caution” LED illuminates. This
indicator condition cancels only after the unit is powered down.
If the circulating water reaches >1°C (2°F) over the set point, the display flashes the actual water
temperature, and 2 beeps sound while the red “Power Failure/Caution” LED flashes. The safety
device shuts off the heater. If the water temperature does not return to the set point temperature
after 9 minutes, the device will again sound 2 beeps and the “Power Failure/Caution” LED will flash.
The actual water temperature will continue to flash until the water temperature reaches the set
point.

OPERATION MICRO-TEMP®LT, Model 749
OPERATION AND TECHNICAL MANUAL
Page 20 of 75
SECTION 2. GENERAL PREPARATION OF THE MICRO-TEMP® LT
SYSTEM
2-1. INTRODUCTION
This section describes the procedures to prepare the MICRO-TEMP®LT unit for general use. This
entails unpacking the shipment, arranging all the equipment for the first time, and completing a test
routine. This section also outlines the bactericidal agent preparations, standard safety precautions,
and patient preparation/bedside care when using the hyperthermia pad(s). Technical support is
available upon request.
2-2. UNPACKING THE SHIPMENT
WARNING
Remove the MICRO-TEMP®LT from service if the outer casing or membrane control panel
is cracked or internal components are exposed. Contact with internal components could
result in electric shock or thermal injury to the patient or operator and exposure to
sharp edges.
During the unpacking process, look carefully for signs of shipping damage. If any unacceptable
damage is found, notify the transportation company immediately and file a claim. The
transportation company is responsible for the shipment after it leaves the factory. If problems other
than shipping damage are found, notify your Cincinnati Sub-Zero representative or the Factory.
2-3. FIRST TIME SET-UP/SYSTEM TEST ROUTINE
This section describes the tasks necessary to inspect and arrange the equipment for the first time
after unpacking, and describes a System Test Routine to check the membrane control panel.
The System Test Routine can also be used to teach operators who are unfamiliar with the
equipment how to use the unit.
2-3.1. INSPECTING AND ARRANGING THE EQUIPMENT
A. Place the MICRO-TEMP®LT unit in an uncluttered work space that is accessible to
the correct power source with an ambient temperature between 20°C –35°C (68°F –
95°F) Position the unit so that the membrane control panel faces the operator. See
Section (7) for electrical specifications.
B. Visually inspect the MICRO-TEMP®LT unit to determine that there are no missing
parts, unusual dents, or punctures.