PHILIPS Respironics DreamStation BiPAP AVAPS Use and care manual

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DREAMSTATION BIPAP S/T AND AVAPS SERVICE &TECHNICAL REFERENCE MANUAL
DreamStation BiPAP S/T and AVAPS
Service and Techincal Reference Manual

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Chapter 1. Introduction................................................................................................................7
1.1 System Overview ..................................................................................................................................7
Device Description.........................................................................................................................8
Therapy Modes..............................................................................................................................8
Therapy Features...........................................................................................................................9
1.2 Device Features..................................................................................................................................11
1.3 Humidifier System Overview...............................................................................................................12
1.4 Service Notice .....................................................................................................................................13
1.5 Service Training ..................................................................................................................................13
1.6 Product Support Statement.................................................................................................................14
Chapter 2. Warnings, Cautions, & Notes..................................................................................14
Chapter 3. Specifications & Classifications.............................................................................14
Chapter 4. Cleaning and Disinfection.......................................................................................15
4.1 Cleaning and Disinfecting: Device and Humidifier Exterior.................................................................15
Chapter 5. Device Setup.............................................................................................................16
5.1 Supplying DC Power to the Device.....................................................................................................16
5.2 Supplying AC Power to the Device.....................................................................................................17
5.3 Connecting the Tubing to the PAP Device..........................................................................................18
5.4 Connecting the Humidifier to the PAP Device.....................................................................................19
5.5 Connecting the Tubing to the Humidifier.............................................................................................20
5.6 Disconnecting the Tubing....................................................................................................................21
5.7 Disconnecting the Devices..................................................................................................................21
5.8 Checking the Humidifier Lid Seal........................................................................................................22
5.9 Installing/Replacing the Air Filters.......................................................................................................23
5.10 Starting the Device ..........................................................................................................................25
5.11 Navigating the Device Screens........................................................................................................26
User Menu Navigation (Therapy On) and Optional Humidification Settings................................27
Adjusting the Humidifier and Heated Tube Settings....................................................................28
User Menu Navigation (Therapy Off)...........................................................................................29
Accessing Provider Mode Screens..............................................................................................35
Navigating the Provider Mode Screens .......................................................................................35
Provider Settings..........................................................................................................................36
5.12 Therapy Event Detection.................................................................................................................44
5.13 Connecting to Wi-Fi (if available).....................................................................................................45

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5.14 Bluetooth Wireless Technology.......................................................................................................46
Pairing to your Bluetooth enabled Mobile Device........................................................................46
5.15 Check Mask Fit................................................................................................................................47
5.16 Sleep Progress................................................................................................................................47
5.17 Altitude Compensation.....................................................................................................................47
5.18 Performance Check Device Screening Tool....................................................................................48
5.19 Accessories......................................................................................................................................48
Humidifier with or without Heated Tubing....................................................................................48
SD Card........................................................................................................................................48
Cellular Modem............................................................................................................................49
Wi-Fi Accessory ...........................................................................................................................49
Link Module..................................................................................................................................49
Oximeter.......................................................................................................................................49
5.20 Updating the Software Using the SD Card......................................................................................49
Chapter 6. Troubleshooting and Error Codes..........................................................................50
6.1 Introduction..........................................................................................................................................50
6.2 Bench Checkout..................................................................................................................................50
PAP Device:.................................................................................................................................50
Humidifier:....................................................................................................................................50
6.3 System Verification..............................................................................................................................51
Pressure Verification....................................................................................................................51
Heated Humidifier Performance Confirmation.............................................................................52
Verifying the Alarms.....................................................................................................................53
6.3.3.1 Patient Disconnect Alarm Test .............................................................................................53
6.3.3.2 Apnea Alarm Test.................................................................................................................54
6.3.3.3 Low Minute Ventilation Alarm Test.......................................................................................54
6.3.3.4 Loss of Power Alarm Test.....................................................................................................54
System Checkout Data Sheet......................................................................................................55
6.4 Service Center Tools Suite..................................................................................................................56
Service Center Tools Suite Installation and Device Connection Process ...................................57
Clearing the Error and Device Logs.............................................................................................59
Clearing Therapy Hours and Blower Hours.................................................................................59
Setting the Session ID..................................................................................................................59
Resetting First Time Use..............................................................................................................60

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6.5 Device Error Codes.............................................................................................................................61
6.6 Failure Mode Troubleshooting.............................................................................................................74
6.7 Device Alarms .....................................................................................................................................80
6.8 Device Alerts .......................................................................................................................................80
6.9 Alarm and Alert LED Indicators...........................................................................................................80
6.10 Alarm and Alert Audible Indicators..................................................................................................81
6.11 Silencing an Alarm...........................................................................................................................82
6.12 Alarm Message Screens..................................................................................................................82
6.13 What to Do When an Alarm Occurs ................................................................................................82
6.14 Alarm Summary Table.....................................................................................................................83
6.15 Alert Summary Table.......................................................................................................................87
Chapter 7. Repair & Replacement.............................................................................................91
7.1 Replacement Part (RP) Kits................................................................................................................92
7.2 Replacement Instructions....................................................................................................................94
Replacing the Accessory Module and SD Flip Doors..................................................................94
Replacing the SD Card ................................................................................................................95
Replacing the Upper Enclosure/Keypad:.....................................................................................95
Replacing the UI Panel ................................................................................................................97
Replacing the PCA.......................................................................................................................98
Replacing the Flow and Pressure Sensor Seals .......................................................................101
Replacing the Blower Upper Cap...............................................................................................102
Replacing the Blower, Blower Box Assembly, and Rear Panel.................................................104
Replacing the Blower Outlet Seal and Blower Isolators ............................................................110
Replacing the DC Power Cable and DC Jack Color Insert........................................................112
Replacing the Bottom Enclosure................................................................................................113
7.3 Creating the Serial/Model Number Label..........................................................................................114
Equipment (Printer)....................................................................................................................114
Software.....................................................................................................................................115
Label Printing Options................................................................................................................115
Chapter 8. Humidifier Repair and Replacement ....................................................................116
8.1 Humidifier Replacement Part (RP) Kits.............................................................................................117
8.2 Replacement Instructions..................................................................................................................118
Replacing the Water Tank Assembly.........................................................................................118
Replacing the Flip Lid and Dry Box Inlet Seals..........................................................................119

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Replacing the Dry Box Assembly...............................................................................................120
Replacing the Wire Guard..........................................................................................................121
Replacing the Back Panel Assembly.........................................................................................124
Replacing the Flip Lid Latch.......................................................................................................125
Replacing the Lifting Tray ..........................................................................................................126
Replacing the Bottom Cover......................................................................................................129
Replacing the Heat Shield..........................................................................................................130
Replacing the Heater Plate O-Ring............................................................................................131
Replacing the Bottom/Flip Lid Assembly ...................................................................................132
Chapter 9. Testing ....................................................................................................................137
9.1 Required Equipment..........................................................................................................................137
9.2 Testing Prerequisites.........................................................................................................................138
9.3 Testing Environment Specifications..................................................................................................138
9.4 Software Download and Installation..................................................................................................138
Windows 10 DreamStation Family Drivers Installation..............................................................139
9.5 Final Testing Procedure....................................................................................................................140

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© 2017 Koninklijke Philips N.V. All rights reserved.

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Chapter 1. Introduction
This service manual provides information on servicing DreamStation BiPAP S/T and AVAPS devices and Hu-
midifiers. Refer to the sections below for an overview of the device, cleaning, troubleshooting, repair and test-
ing procedures.
CAUTION
U.S. federal law restricts this device to sale by or on the order of a physician.
1.1 System Overview
Device Description
Model Number Series*
DreamStation BiPAP S/T 25
yyX1025Szz (C or W**)
DreamStation BiPAP S/T 25 w/ Humidifier and Standard Tube yyX1025Hzz (C or W**)
DreamStation BiPAP S/T 25 w/ Humidifier and Heated Tube
yyX1025Tzz (C* or W**)
DreamStation BiPAP S/T 30
yyX1030Szz (C* or W**)
DreamStation BiPAP S/T 30 w/ Humidifier and Standard Tube
yyX1030Hzz (C* or W**)
DreamStation BiPAP S/T 30 w/ Humidifier and Heated Tube
yyX1030Tzz (C* or W**)
DreamStation BiPAP AVAPS 25
yyX1125Szz (C or W**)
DreamStation BiPAP AVAPS 25 w/ Humidifier and Standard Tube
yyX1125Hzz (C or W**)
DreamStation BiPAP AVAPS 25 w/ Humidifier and Heated Tube
yyX1125Tzz (C or W**)
DreamStation BiPAP AVAPS 30
yyX1130Szz (C or W**)
DreamStation BiPAP AVAPS 30 w/ Humidifier and Standard Tube
yyX1130Hzz (C or W**)
DreamStation BiPAP AVAPS 30 w/ Humidifier and Heated Tube
yyX1130Tzz (C or W**)
DreamStation BiPAP AVAPS 30 AE
yyX1131Szz (C or W**)
DreamStation BiPAP AVAPS 30 AE w/ Humidifier and Standard Tube
yyX1131Hzz (C or W**)
DreamStation BiPAP AVAPS 30 AE w/ Humidifier and Heated Tube
yyX1131Tzz (C or W**)
DreamStation Humidifier
yyXH
DreamStation Humidifier, Core Pack
yyXHCP

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*yy and zz are variables that represent regional configurations, i.e. DOM or INTL models.
X is fixed and represents the DreamStation platform.
*A model ending in a C signifies a Cellular modem was installed in the device as part of the finished good.
** A model ending in a W signifies a Wi-Fi modem was installed in the device as part of the finished good.
Device Description
The devices are intended to augment patient breathing by supplying pressurized air through a patient circuit.
They sense the patient’s breathing effort by monitoring airflow in the patient circuit and adjusts its output to
assist in inhalation and exhalation. This therapy is known as Bi-level ventilation. Bi-level ventilation provides a
higher pressure, known as IPAP (Inspiratory Positive Airway Pressure), when inhaling, and a lower pressure,
known as EPAP (Expiratory Positive Airway Pressure), when exhaling. The higher pressure supports inhala-
tion, and the lower pressure makes it easier to exhale.
When prescribed, the device can also provide features to help make therapy more comfortable. The ramp
function allows you to lower the pressure when trying to fall asleep. The air pressure will gradually increase
until the prescription pressure is reached. Additionally, the Flex comfort feature provides increased pressure
relief during the expiratory phase of breathing.
United States
The BiPAP S/T and AVAPS devices are intended to provide non-invasive ventilatory support to treat adult and
pediatric (> 7 years of age; > 40 Ibs) patients with obstructive Sleep Apnea (OSA) and Respiratory Insuffi-
ciency. These devices may be used in the hospital or home.
Rest of World
The BiPAP S/T and AVAPS devices are intended to provide non-invasive ventilatory support to Obstructive
Sleep Apnea (OSA) and Respiratory Insufficiency patients weighing over 18 kg. These devices may be used
in the hospital or home.
Therapy Modes
Therapy Mode Description
CPAP
Continuous Positive Airway Pressure; CPAP maintains a
constant level of pressure throughout the breathing cycle.
S
Spontaneous Pressure Support; A Bi-level therapy mode
where breaths are patient-triggered and patient-cycled.
The device triggers to IPAP (Inspiratory Positive Airway
Pressure) in response to spontaneous inspiratory effort
and cycles to EPAP (Expiratory Positive Airway Pressure)
during exhalation. The device also cycles a patient-trig-
gered breath if no patient exhalation effort is detected for
3 seconds. The level of Pressure Support delivered is de-
termined by the difference between the IPAP and EPAP
settings (PS = IPAP - EPAP)
S/T
Spontaneous/Timed Pressure Support; A Bi-level therapy
mode where each breath is patient-triggered and patient-
cycled or machine-triggered and machine-cycled. S/T
mode is similar to S mode, except that the device also will
enforce a set minimum breath rate by, if necessary,

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providing machine (time) triggered breaths. For these
breaths, the inspiratory time is also a set value.
T
(BiPAP AVAPS device only)
Timed Pressure Support; A Bi-level therapy mode where
breaths are machine-triggered and machine-cycled. T
mode provides mandatory pressure assist with bi-level
pressures. The patient’s breathing rate has no effect on
the machine rate or pressure levels. The trigger to IPAP is
determined by the breath rate setting, and the cycle time
is determined by the Inspiratory Time setting.
PC
(BiPAP AVAPS device only)
Pressure Control Pressure Support; A Bi-level therapy
mode where each breath is patient or machine-triggered
and machine-cycled. PC mode is similar to S/T mode, ex-
cept that all breaths are machine-cycled. This is a pres-
sure-limited, machine or patient-triggered, time-cycled
mode. The cycle time is determined by the Inspiratory
Time setting.
Therapy Features
Automated Airway Management (AAM)
If enabled, AAM is a feature available in S, S/T, PC, and T modes. The device monitors the patient’s upper
airway resistance and automatically adjusts the delivered EPAP required to maintain a patent airway. The
AAM feature adjusts the EPAP level between the minimum (EPAP Min) and maximum (EPAP Max) settings.
The IPAP level is controlled by the pressure support (PS) setting.
AVAPS (BiPAP AVAPS device only)
If enabled, Average Volume Assured Pressure Support (AVAPS) is a feature available in the S, S/T, PC, and
T modes. It helps patients maintain a tidal volume (VT) equal to or greater than the target tidal volume (Vol-
ume setting in the AVAPS) by automatically controlling the gradual change in pressure support (PS) provided
to the patient. The rate of change is such that the patient is not aware of breath to breath pressure changes.
The AVAPS feature adjusts PS by varying the IPAP level between the minimum (IPAP Min) and maximum
(IPAP Max) settings to meet the prescribed assured tidal volume setting.
If Automated Airway Management (AAM) is enabled, the AVAPS feature adjusts PS by varying the PS level
between the minimum (PS Min) and maximum (PS Max) settings.
As patient effort decreases, AVAPS automatically increases PS to maintain the target tidal volume. The IPAP
or PS level will not rise above IPAP Max or PS Max, even if the target tidal volume is not reached. Con-
versely, as patient effort increases, AVAPS may reduce PS. IPAP will not fall below IPAP Min, even if the tar-
get tidal volume is exceeded. If IPAP Max is reached and the target tidal volume is not achieved, the Low
Tidal Volume alarm activates if it is enabled.

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Bi-Flex Comfort Feature
If enabled, the device provides a comfort feature called Bi-Flex. The Bi-Flex attribute adjusts therapy by in-
serting a small amount of pressure relief during the latter stages of inspiration and during active exhalation
(the beginning part of exhalation). Bi-Flex levels of 1, 2, or 3 progressively reflect increased pressure relief
that will take place at the end of inspiration and at the beginning of expiration.
Ramp
The device is equipped with an optional ramp feature. The ramp feature is designed to offer lower pressures
when activated and then gradually increase pressure over the set ramp period.
If ramp is activated with AVAPS and Automated Airway Management (AAM) disabled, it will reduce EPAP and
IPAP pressures to Ramp Start pressure and Ramp start pressure plus a Delta, and ramp up to the original
prescribed settings over the ramp time period. The Delta is the lesser of 2 cmH2O and the difference between
the IPAP and EPAP pressure settings.
If ramp is activated with AAM enabled, it will also reduce EPAP pressure to the EPAP Min setting, after which
EPAP shall change based on the airway’s resistance. If AVAPS is disabled, it will reduce the delivered PS to
approximately 2 cmH2O and ramp to the PS setting over the ramp time period.
If ramp is activated with AVAPS enabled, it will reduce the maximum pressure support capability to IPAP Min
or PS Min and ramp to the IPAP Max or PS Max over the ramp time period. During the ramp period, the pre-
scribed tidal volume may not be achieved.

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Rise Time Comfort Feature
If enabled, the device provides a feature called Rise Time in all ventilation modes except CPAP. Rise time is
the amount of time it takes the device to change from the expiratory pressure setting to the inspiratory pres-
sure setting. Rise time levels of 1, 2, 3, 4, 5, or 6 progressively reflect slowed response of the pressure in-
crease that will take place at the beginning of inspiration. A setting of 1 is the fastest rise time while a setting
of 6 is the slowest. Adjust the rise time to find the most comfortable setting for the patient. Rise time cannot
be adjusted when Bi-Flex is enabled.
Digital Auto-Trak
Digital Auto-Trak is an important ventilation feature due to its ability to recognize and compensate for uninten-
tional leaks in the patient circuit. Digital Auto-Trak is an automated process that maintains optimum ventilator
performance in the presence of leaks. The device continuously monitors the actual circuit and adjusts an in-
ternal estimate of patient flow as natural variations in the circuit leak occur. As unintentional circuit leaks oc-
cur, the triggering and cycling algorithms ensures optimum patient and machine synchrony. It also provides a
high degree of accuracy for calculation of flow-based parameters, such as exhaled tidal volume.
1.2 Device Features

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The figure above illustrates some of the device features, described in the following table.
1.3 Humidifier System Overview
The DreamStation Heated Humidifier attaches to the therapy device and provides an air outlet port to connect
a breathing circuit. The breathing circuit is comprised of patient tubing, a mask, and in some instances a sep-
arate exhalation device. The patient tubing can be Respironics heated tubing, 22 mm (non-heated) perfor-
mance tubing or 15 mm (non-heated) performance tubing.
The DreamStation Heated Humidifier with Heated Tubing is designed to deliver humidification to provide
added comfort during therapy. This humidification level is controlled through the output of the heated humidi-
fier as well as the temperature of the optional heated tubing. Use of these two accessories allows for a com-
fortable level of humidity to be maintained at the mask.
The DreamStation Heated Humidifier is comprised of the following components:
•Heated Humidifier - The heated humidifier is the primary source of humidification. Humidification is
controlled by adjusting the temperature of the heater plate. The heater plate is then used to heat wa-
ter found in the water tank. This manual includes instructions that explain how to set up and take care
of the heated humidifier. For instructions on how to adjust the heated humidifier settings, refer to the
instructions for use that accompanied the therapy device.
•Water Tank - The water tank stores the water that will be used by the heated humidifier. This manual
includes instructions that cover how to use and take care of the water tank.
•Heated Tubing - The heated tubing is an optional accessory that is used, along with the heated hu-
midifier, to control the provided humidification. This is accomplished by controlling the temperature of
the air in order to ensure that it does not cool down prior to reaching the mask. This manual includes
instructions that cover how to connect and take care of the heated tubing. For instructions on how to
adjust the temperature of the heated tubing, refer to the instructions for use that accompanied the
therapy device.

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1.4 Service Notice
The service technician should have a good working knowledge and understanding of the principles of opera-
tion and repair of electro-mechanical sleep therapy devices. By using the most current version of the service
manual (found on my.respironics.com) and the latest testing software, all repairs and testing can be per-
formed. If service training is desired, contact the Philips Respironics service location in your area to schedule
training.
1.5 Service Training
Philips Respironics offers service training for the devices. Training includes complete disassembly of the de-
vice, troubleshooting sub-assemblies and components, and necessary safety testing. For more information,
log onto my.respironics.com, and download the Service Training Schedule brochure from the Service Soft-
ware and Documentation link.

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1.6 Product Support Statement
For product support, please contact Philips Respironics Customer Satisfaction.
U.S.A. and Canada
Phone:[phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Chapter 2. Warnings, Cautions, & Notes
Warnings, cautions, and notes are used throughout this manual to identify possible safety hazards, conditions
that may result in equipment or property damage, and important information that must be considered when
performing service and testing procedures on the device.
WARNING
Warnings indicate the possibility of injury to people.
CAUTION
Cautions indicate the possibility of damage to equipment.
NOTE
Notes are used to emphasize a characteristic or important con-
sideration.
Refer to the device User Manual for warnings, cautions and notes.
User Manuals
DESCRIPTION PART NUMBER
DreamStation BiPAP S/T, AVAPS ,Manual, EN-DOM
1129570
DreamStation Humid, User Manual, EN-INTL CE
1121984
Chapter 3. Specifications & Classifications
Refer to the device User Manual listed above for warnings, cautions and notes.

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Chapter 4. Cleaning and Disinfection
4.1 Cleaning and Disinfecting: Device and Humidifier Exterior
CAUTIONS
Only the cleaning and disinfection procedure listed in this manual are recommended by Respironics.
Use of other cleaning and disinfecting processes, not specified by Respironics, may affect the
performance of the product. If there are any uncertainties related to the disinfectants you are using,
please contact Philips Respironics to see if they are approved for use.
Follow all instructions from the manufacturer of the disinfectant product. Any deviation from these
instructions, the manufacturer’s instructions, or agents not listed in this guide may impact the
performance of the product. Review all applicable instructions for additional warnings and cautions.
WARNING
To avoid electrical shock, always unplug the power cord from the wall outlet before cleaning the
device. DO NOT immerse the device in any fluids.
Perform the following steps to clean and disinfect the device and humidifier prior to servicing the devices:
1. Turn the device off and disconnect from the power source before cleaning.
2. Remove and dispose of the blue pollen filter and light-blue disposable ultra-fine filter (if returned with
the device).
3. As needed, clean the device and humidifier exterior using a mild liquid dishwashing detergent. Use a
mixture of 1 teaspoon (5 milliliters) dishwashing detergent/1 gallon (3.8 liters) of water.
4. Allow the device and humidifier to air dry. Use one of the following to disinfect all exterior surfaces of
the device and humidifier, including the filter and accessory access doors.
•DisCide Ultra Towelettes
•Cloth with chlorine bleach (8% sodium hypochlorite), 1 to 10 part reduction with water.
5. Pay close attention to all corners and crevices.
6. Open the humidifier lid and disinfect the latch area.
7. Allow the device and humidifier to air dry completely before plugging in the power cord and turning
the device on.

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Chapter 5. Device Setup
This chapter provides an overview of the system setup including introductory information on the User and
Provider modes and menus. Please refer to the device’s User Manual for further information.
WARNING
•Inspect the power cord often for any signs of damage. Replace a damaged power cord
immediately.
•Be sure to route the power cord to the outlet in a way that will prevent the cord from
being tripped over or interfered with by chairs or other furniture.
•This device is activated when the power cord is connected.
CAUTION
•If the device has been exposed to either very hot or very cold temperatures, allow it
to adjust to room temperature (approximately two hours) before beginning setup.
•Do not use extension cords with this device.
NOTE
•Please refer to the Clinical Manual for additional information.
5.1 Supplying DC Power to the Device
A Philips Respironics DC power cord can be used to operate this device in a stationary recreational vehicle,
boat, or motor home. In addition, a Philips Respironics DC battery adapter cable, when used with a DC power
cord, allows the device to be operated from a 12 VDC free-standing battery.
CAUTION
•Always ensure that the DC power cord securely fits into the therapy device prior to use.
•When DC power is obtained from a vehicle battery, the device should not be used while
the vehicle’s engine is running. Damage to the device may occur.
•Only use a Philips Respironics DC Power Cord and Battery Adapter Cable. Use of any
other system may cause damage to the device.
Refer to the instructions supplied with the DC power cord and adapter cable for information on how to operate
the device using DC power.

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5.2 Supplying AC Power to the Device
Complete the following steps to operate the device using AC power:
1. Plug the socket end of the AC power cord into the power supply.
2. Plug the pronged end of the AC power cord into an electrical outlet that is not controlled by a wall
switch.
3. Plug the power supply cord’s connector into the power inlet on the side of the device.
4. Verify that the plug at the side of the device, at the power supply, and at the electrical outlet are fully
inserted. This will help to ensure that a secure, reliable electrical connection has been made.
NOTE
If the following Incorrect Power Supply icon appears on the screen, please
repeat step 4.

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5.3 Connecting the Tubing to the PAP Device
To connect the Tubing to the device, complete the following steps:
1. Connect the flexible tubing to the air outlet on the back of the therapy device. Line up the connector
(1) at the top of the heated tube to the top of the air outlet port on the back of the device.
2. Press the tubing into place over the air outlet port until the tabs on the side of the tube click into place
in the slots on the sides of the outlet port.
NOTE
Ifyouareusinga standard tube(notshown)instead of a heated tube,simply
slide the tubing over the air outlet port on the therapy device.

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WARNINGS
•Do not pull or stretch the tubing. This could result in circuit leaks.
•Inspect the tubing for damage or wear. Discard and replace the tubing
as necessary.
•If the device is used by multiple persons (such as rental devices), a
low-resistance, main flow bacteria filter should be installed in-line
between the device and the circuit tubing to prevent contamination.
5.4 Connecting the Humidifier to the PAP Device
CAUTION
Do not move the humidifier while the water tank has water in it.
1. Place the therapy device and heated humidifier (with an empty water tank) on a firm, flat surface.
2. Line up the back of the therapy device to the front (top lid release latch side) of the heated humidifier.
3. Make sure the air outlet port on the therapy device lines up with the air inlet port on the humidifier (not
shown).
4. Slide the two units together until they snap into place.
5. Make sure that the therapy device and the humidifier are completely seated against each other.

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5.5 Connecting the Tubing to the Humidifier
1. To attach the heated tube to the heated humidifier, line up the connector (1) at the top of the heated
tube to the top of the air outlet port (2) on the humidifier.
2. Press the tubing into place over the air outlet port until the tabs on the side of the tube click into place
in the slots on the sides of the outlet port.
3. If you are using a standard tube (not shown) instead of a heated tube, simply slide the tubing over the
air outlet port on the heated humidifier.