AAS DARVALL Cozy User manual

Regional Customer Support

3
Darvall CozyTM Warm Air Heater
Serial Number: ____________________________
Contents
Subject Page
Darvall Cozy Warm Air Heater Parts and Specifications 2
General Warnings related to Warming Animals 4
Warnings related to use of the Darvall Cozy Warm Air Heater 5
Darvall Cozy Warm Air Blanket Designs & Applications 6
Darvall Cozy Warm Air Heater Components, front & rear views 7
Preparing to use Darvall Cozy Warm Air Heater 8
Installation of the Darvall Cozy Wheels 9
Use the Darvall Cozy Heater with an appropriate warming blanket 10
Darvall Cozy Warm Air Heater Control Panel, Indicators & Buttons 11
Selecting the Temperature 12
Safety system and alarms 13
Fault Alarm Conditions Table 14
Fault Alarm Troubleshooting Table 15
Air Filter Routine Maintenance 16
Replacing the Darvall Cozy HEPA Air Filter 17
Replacing the Darvall Cozy Heater Hose 18
Specifications and Darvall Cozy Warm Air Heater Parameters 19
Modes of Cozy Heater Operation 20
The AAS Warranty 21

4
General Warnings related to Warming Animals
Hypothermia occurs in 85% of anesthetized small animals. The Darvall Cozy Warm Air Heating System
is thermostatically controlled, intended to safely warm caged or kenneled animals before anesthesia,
during recovery and critical care as well as warming animals during anesthesia, surgery, dentistry,
minor procedures, endoscopy, imaging etc.
Animals should be under observation during use of warming devices and their body temperature
monitored frequently (usually every 20 min) or continuously.
Do not actively warm animals (mammals) above 37oC/98.6oF (for reptiles use lower temperatures)
To prevent the risk of burning skin the Cozy Heater is designed to be connected to a purpose-made
semi-permeable forced warm air blanket that distributes the warm air evenly around the animal.
Never place the heater nozzle next to an anaesthetized animal without connecting it to a purpose
made warming blanket. Even at 46oC/115oF, burning can occur with skin contact, typically>2hrs.
Darvall has invested 10 years of research into developing and manufacturing an innovative range of
blankets designed to deliver warm air safely, effectively and uniformly to caged and anaesthetized
animals (International Patents granted and applied for). The full range of Darvall Warm Air Blankets
for use in cages, anesthesia or surgery are shown on Page 6.
The Darvall Twist-Connect Kennel Door Adapter ducts warm air safely into kennels. Simply twist to
lock/unlock from grill or wire doors and rapidly moved between kennels. Darvall’s adapter permits
warm air to be ducted into kennels with secure closure of the door preventing risk of animals falling
out and enabling rapid access in an emergency. Use of the kennel door adapter will reduce risk of
physical damage to heater hoses.
The Darvall Cozy Warm Air Heater has a 0.2um HEPA air filter which should be replaced every 6
months or 500 hours of use. Instructions for changing the filter are on Page 17.
The Darvall Cozy Warm Air Heater is intended to be used on wheels to elevate the heater above
the floor and minimize contamination of the HEPA air filter with dust and hair.
There is Minimal Infection Risk using warm air heating during surgery in an appropriate manner.
For any sterile procedure use of a new Darvall Warm Air Blanket is advisable. In human surgery, use
of forced warm air heating is associated with lower rates of infection if the heater is properly
maintained, the filter changed regularly and new warm air blankets are used for each surgery
compared to no warming.

5
Warnings related to use of the Darvall CozyTM Warm Air Heater
Grounding reliability can ONLY be achieved when the Darvall Cozy Heater’s power cord is
connected to a properly grounded Mains power outlet.
If the over-temperature indicator light illuminates and the alarm sounds, discontinue using of
Darvall Cozy Heater to prevent thermal injury to the patient. Unplug the Darvall Cozy Heater
and contact a qualified service technician.
Do not use the Darvall Cozy Heater if it is not connected to blankets or Thermal Injury may
result. The Cozy Heater is designed to be connected to a purpose-made semi-permeable
forced warm air blanket that distributes warm air evenly around the animal.
Caution using Darvall Cozy Warm Air Heating System in animals with transdermal
medication. Drug delivery may be increased which could result in animal injury or death.
Do not allow the animal to lie on Darvall Cozy Heater Hose or allow the hose to directly contact
the animal’s skin during warming, or thermal injury may occur.
When replacing the Darvall Cozy Heater Hose, always disconnect the temperature sensor
attached to the old hose. Be sure to attach the hose and temperature sensor from the new
hose, prior to using the device.
Do not use Darvall Cozy Heater in MRI rooms as the heater contains ferrous metal and emits
RF interference. Darvall can supply all-plastic heater extension hoses to duct warm air from
outside the MRI room or the magnetic field to warm air blankets covering animals in MRI
The Darvall Cozy Heater meets medical electronic interference requirements (IEC60601-1-2)
Clamping the Darvall Cozy Heater to an IV pole stand can result in instability. To prevent this,
use the Darvall Cozy Heater no higher than 60 cm (24") high on an IV pole stand.
Do not use Cozy Heater replacement components in that are not supplied by Darvall/AAS or
their distributors or authorized service agents
Electrical shock hazard: Do not disassemble the Darvall Cozy Heater unless you are a
qualified service technician. There are electrically live parts in the Darvall Cozy Heater if it is
connected to a power source, even when it not switched on OR is in Standby mode.
End-users may replace the Darvall Cozy HEPA Air Filter, the heater hose with temperature sensor,
the heater hose cover and the electrical fuse located near the mains supply inlet power cord.

6

7
Darvall CozyTM Warm Air Heater Components, front & rear views
Figure 1. Darvall Cozy Heater - Front View
Shows control panel, handle on top of the top case,
Heater Hose Elbow swivel outlet and Heater Hose
with Darvall Nozzle on hose end. Nozzle inserts into
blankets which tie behind the flange. Nozzle also
push-fits into Darvall’s patented Kennel Door Adapter
used to duct warm air safely into small and larger
cage blankets for pre-warming before anesthesia and
post-anesthesia recovery warming.
The Cozy Heater is mounted on 4 swivel wheels.
Figure 2. Darvall Cozy Heater
Rear view
The power switch is next to the Power
Cord inlet and will disconnect all power
to the Darvall Cozy if in the OFF position.
The fuse is located to the right of the
power cord inlet. Always disconnect the
power cord before opening the fuse
compartment.
IV Pole Mount clamp and kennel door
hooks (hinged) can be seen.
Figure 3. Darvall Cozy Heater Under-side View
Shows Air Intake with HEPA Air Filter cover. If the air intake is
obstructed, the Cozy can over heat.
It is best to use Cozy Heater on wheels, mounted on an IV Pole
Stand or hanging on a cage.
The HEPA Air Filter should be changed every 500 hours or
6 months of use. See page 17
Air Flow

8
Preparing to use Darvall CozyTM Warm Air Heater
To avoid damage to Darvall CozyTM Warm Air Heater
Do not immerse the Darvall Cozy Heater or Darvall Cozy parts or accessories in any liquid or subject
them to any sterilization process.
Do not use solvents such as acetone or paint thinner to clean the Darvall Cozy Heater plastic housing;
Do not use abrasive cleaners or scouring pads to clean the Darvall Cozy Heater plastic housing;
Clean the Darvall Cozy Heater exterior with a soft cloth using plain water or a mild, all-purpose,
nonabrasive cleaner or disinfectant (eg dilute chlorhexidine soap) or plastic cleaner or plastic polish.
Maintenance
The Darvall Cozy Heater should be used in the manner described in the Instruction Manual.
Users should not repair any internal electronic components of the Darvall Cozy Heater.
If a fault condition occurs, do not open the Darvall Cozy Heater as this will void the warranty and
may result in injury or death. There are electrically live parts in the Darvall Cozy Heater if it is
connected to a power source, even when it not switched on.
Repair, calibration, and service of Darvall Cozy Warm Air Heaters should be done by a qualified
service technician in accordance with the instructions in the Service Manual.
Warranty repairs must be performed by AAS/Darvall or be approved in writing if undertaken by a
third party qualified service technician.
Contact Advanced Anesthesia Specialists or visit our website if you require advice or instructions.
Please check and verify that all components are present. If any parts are
missing or damaged, do not use the Darvall Cozy Heater.
Darvall Cozy Heater should be connected to a properly grounded mains
power outlet.
The Darvall Cozy Heater is intended to be elevated above the floor to
minimize contamination of the filter with dust and hair.
Mount Darvall Cozy Heater on its wheel assembly, usetherearmountedclamp
andpositiononanIV pole stand or use rear hooks to hang on a cage or kennel
door. IftheDarvallCozyHeaterisNOTONWHEELS,IVPoleorhanging then place on
its feet on a flat, hard, dry surface such as a table or shelf.
Do not place the Darvall Cozy Heater on a soft or uneven surface since
the air intake may become obstructed, causing the Darvall Cozy to
overheat.
Unstable mounted
too high on
IV Pole stands
To prevent instability, use the Darvall Cozy Heater no higher than
60cm (24") high on the IV pole stand.
Heater Hose
Temperature
Sensor
The Darvall Cozy Heater must be connected to its heater hose with built-
in temperature sensor for it to work.

9
Installation of Wheels on the Darvall Cozy Heater Tools: None Time: 5 min.
Darvall’s Cozy Warm Air Heater includes
a “wheel kit” = 4 x 40mm swivel wheels, with their
vertical shaft installed into a wheel-mount adapter.
NO TOOLS are required for assembly. Time: 5 min.
Wheel-Mount assembly Installation:
1. Disconnect the Cozy Heater from the power source
before commencing wheel installation.
2. Place the Cozy Heater on its side on a padded surface
(eg. towel) on a stable bench or table. The Elbow Hose
Outlet should be on the UP SIDE.
3. Wheels “push fit” onto the four feet (lugs) on the
under-side of the bottom case, one located on each
corner. These are slightly tapered cylinders so each
wheel-mount adapter “locks on” by friction. Simply
push the wheel-mount assembly on by hand.
4. Lift the Cozy Heater holding the top handle, turn
over and lower to the floor onto the wheels.
Removal of Wheels from the Darvall Cozy Heater Tools: Adjustable Spanner Time: 5 min.
Removing the 40mm swivel wheels, each
with its “push-fit” wheel-mount adapter is
essentially the reverse of the installation
procedure for the Wheel-Mount assembly.
The main difference is that the friction joint
between the Cozy Heater feet and the wheel
mount needs to be loosened to permit
removal.
Tools: Open-end or adjustable spanner
Time: 5 minutes
1. Disconnect the Cozy Heater from the power
source before commencing work.
2. Place the Cozy Heater on its side on a padded
surface (eg. towel) on a stable bench or table.
The Elbow Hose Outlet should be the UP side.
3. Use a suitable size open-end spanner or
adjustable wrench, placed around the shaft of
the wheel-mount adapter where you see the 2
flat sides.
4. Gently raise, then lower the spanner
(cylindrical motion) to loosen the friction joint
between the adapter and the Cozy Heater feet.
5. The wheel & mount assembly should be easily
pulled off with gentle retraction by hand.

10
Use the Darvall CozyTM Warm Air Heater with an appropriate warming blanket
To prevent the risk of burning skin the Cozy Heater is designed to be connected to a purpose-
made semi-permeable forced warm air blanket that distributes the warm air evenly around the
animal.
Never place the heater nozzle next to an anaesthetized animal without connecting it to a
purpose made warming blanket. Even at 46oC/115oF, burning can occur with skin contact,
typically>2hrs.
The animal contacts the white, permeable side of the
blanket, the yellow side is impermeable to air & water. Lay
the blanket on the table under an animal or place in the cage
or kennel, generally over the animal to minimise soiling.
Attach the Darvall Cozy heater hose to the Warming Blanket
Insert the hose nozzle into the warming blanket’s entry port
so as to minimize kinks at this point
Wrap the blanket tapes firmly round the heater hose nozzle
behind the flange to ensure a connection that does not leak
air.
For use in surgery, position the anaesthetized, clipped and prepped animal on the warming blanket,
position the surgical drapes over the animal, THEN inflate the blanket. The blanket will conform around
the animal and under the drapes without distorting the surgical drapes.
Darvall CozyTM Warm Air Heater Front Control Panel
The Darvall Cozy Heater Control Panel Icons cover Buttons operated by touch.
Selecting each Button sets warming temperature and fan speed.
When a system fault occurs, the display flashes and an alarm sounds.
The fault / error code will be shown on the display screen.

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Darvall CozyTM Warm Air Heater Control Panel Indicators & Buttons
1. Control LED Indicators
Over temperature alarm indicator.
When illuminated steady red, the actual exhaust air temperature is in excess of
the selected range.
Power (standby) indicator
When illuminated steady green, means system is in standby mode.
Temperature--in-range indicator
When illuminated steady yellow, means that the actual exhaust air temperature
is not in the selected range (±3.0°C).
2. Temperature Selection Buttons
High (43°C) button
When selected, the air Temperature set point is set to 43°C
MID (38°C) button
When selected, the air Temperature set point is set to 38°C
LOW (32°C) button
When selected, the air Temperature set point is set to 32°C
Ambient button
When selected, the air Temperature set point is set to room temperature.
Air flow button
When selected, the air flow will be toggled between high and low speed.
LED on –Low Air Flow Mode; LED off –High Air Flow Mode.
3. Power ON/OFF Button
Toggles system from Power Off to Standby Mode to Operating Mode
4. Display
Displays warning, alarms and relevant information of the Darvall Cozy Heater.
Connecting the power
Securely connect Darvall Cozy Warm Air Heater to a properly grounded power source.
Turn the rear power switch on. The Darvall Cozy Warm Air Heater will perform its
Self-Test Sequence (STS). During the STS, ALL the indicator LED’s and the display will illuminate.
After STS the Darvall Cozy will be operating in standby mode. The default set point is 32°C and the
light on that temperature selection button will illuminate.
The Power Button standby indicator will be illuminated in “Standby Mode”.
To completely SWITCH OFF the electrical power, press the POWER again.

12
Selecting the Temperature
Select the temperature you wish to operate at and press that button.
The LED light above the selected button will illuminate (green)
There are four Buttons for Temperature:
1. Ambient temperature
a) Press “Ambient” (Room temperature) button.
b) The LED light above the button will illuminate.
c) The Darvall Cozy Warm Air Heater will draw in room temperature air throughtheHEPA filter.
2. 32°C
a) Press “32°C”(LOW temperature) button.
b) The LED light above the button will illuminate
c) The Darvall Cozy Warm Air Heater will heat HEPA filtered air to LOW temp. setting = 32°C.
3. 38°C
a) Press “38°C”(MIDDLE temperature) button.
b) The LED light above the button will illuminate.
c) The Darvall Cozy Warm Air Heater will heat HEPA filtered air to MIDDLE temp. setting = 38°C.
4. 43°C
a) Press “43°C”(HIGH temperature) button.
b) The LED light above the button will illuminate.
c) The Darvall Cozy Warm Air Heater will heat HEPA filtered air to HIGH temp. setting = 43°C.
Temperature “In Range”Indicator (red light) will be turned off when the actual exhaust air
temperature reaches the setting temperature (±3°C).
Switching to Operating Mode using the Power Button
1. Press ON / OFF button to switch the Darvall Cozy Heater from Standby Mode to Operating Mode.
2. The Darvall Cozy Heater will blow air and the Heater Hose temperature will gradually increase.
3. The temperature selection can be changed anytime when the Darvall Cozy Heater is in operating by
pressing the desired temperature Button.
Adjusting the fan speed –Press the Air Flow Button to toggle between High and Low fan speed.
Air Flow: High
Temp: 32°C
Total Run Time:
00 Hours 00 Min.

13
Monitor the Animal’s Response to Warming
During warming, monitor the animal’s temperature and vital signs every 20 to 30 minutes.
Adjust air temperature or discontinue therapy when the therapeutic goal is reached.
Do not actively warm animals (mammals) above 37oC/98.6oF
For reptiles use lower temperatures
The display flashes & the alarm sounds if the Heater air temperature is higher or lower than
the selected temperature set point.
Discontinuing Warming:
Press the power ON/OFF button. The Darvall Cozy will automatically turn off the heating system.
The fan will continue to run for 30 seconds to cool the heater, then it switches into standby mode.
Safety system and alarms
1. Switch the Darvall Cozy Heater on. The self-test starts.
2. All indicators on the Control Panel light up & the alarm sounds are tested.
3. This test indicates that the visible and audible alarm indicators are functioning correctly.
4. The LCD display will indicate when the Darvall Cozy Heater needs regular maintenance.
The Darvall Cozy has 2 sensors
1. Sensor1: Temperature Sensor in the hose outlet. (Inside of the hose nozzle)
2. Sensor2: Temperature Sensor in the air outlet. (At the elbow of the hose)
3. During the STS (Self-Test Sequence), the over-temperature alarm will sound then turn off
4. During normal operation NO temperature alarms should be displayed.
5. The temperature alarms sound if the temperature limits are exceeded, for example if the Darvall
Cozy Heater is set to warm to 43°C and the Heater Hose outlet temperature sensor 1 is outside of
43±3°C or Cozy Heater Outlet temperature sensor 2 is outside 53±3°C the over temperature limit
alarm sounds.
If a “Temperature Alarm”Condition occurs
1. Unplug the power and wait for 5minutes.
2. Reconnect the Darvall Cozy Warm Air Heater to a grounded power source. The Darvall Cozy
Heater should reset using the the normal STS sequence.
3. Select a temperature setting and turn the Darvall Cozy Heater. It should function normally
“High Level Temperature”Alarm Conditions
If the Darvall Cozy Heater senses that the Sensor 2 air temperature is above the 53±3°C range, the red
over-temperature alarm indicator illuminates and the alarm sounds within 5 seconds. At the same time,
the display flashes and shows “Over Temperature”. This alarm will continue until the temperature is
lower than 44°C.
The Darvall Cozy automatically turns off the heater and fan. You can press “ON/OFF” button to switch
the Darvall Cozy into standby mode.
If the High Level Temperature Alarm Condition re-occurs turn off the power and unplug the Darvall Cozy
Warm Air Heater from the wall outlet.
If the Darvall Cozy Warm Air Heater does not return to normal operation after a resetting following a
Temperature alarm OR if there is a High Level Temperature Alarm Condition, please contact the Darvall
Cozy Heater distributor or AAS Customer Service or a qualified service technician.

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Fault Alarm Conditions Table
Fault #
LCD display
Alarm Sounds
Device State
Remark
E01
Sensor One ERR!
Or
Sensor Two ERR!
Low Pitch Trill
3 rings
1) LCD shows Sensor error.
2) Device stops working.
3) Alarm prompts.
4) Any operation is invalid.
Repeat interval of 10
seconds
E02
FAN …ERR
Low Pitch Trill
3 rings
1) Fan stopped.
2) Alarm prompts.
Repeat interval of 10
seconds
E03
PTC … ERR
Low Pitch Trill
3 rings
1) PTC heating element
stopped working
2) Alarm prompts.
Repeat interval of 10
seconds
E04
OVER TEMPERATURE!
High Pitch Trill
5 rings
1) Temperature stops rising,
Fan stops working after 60
seconds.
2) Alarm prompts.
3) OVER-TEMP indicator light
flashing.
Repeat interval of 5
seconds
E05
LAST TIME ERR!
PRESS ON/OFF KEY
Low Pitch Trill
3 rings
1) Loss of power
2) Alarm sounds once
Heater shuts down
automatically

15
Fault Alarm Troubleshooting Table
Fault #
Possible Cause
Solution
E01
One or two temperature sensors are
electrically disconnected, or sensor is
faulty.
1) Unplug Darvall Cozy Warm Air Heater and wait for 5
minutes.
2) Check that the hose is connected firmly to the device,
then restart the Darvall Cozy.
3) If the display shows the same fault code, contact a
qualified service technician to replace the sensors.
E02
Fan does not run, or is faulty
1) Unplug Darvall Cozy Warm Air Heater and wait for 5
minutes.
2) Restart the Darvall Cozy.
3) If the display shows the same fault code, contact a
qualified service technician to replace the fan.
E03
PTC heating element is electrically
disconnected, or is faulty
1) Unplug Darvall Cozy Warm Air Heater and wait for 5
minutes.
2) Restart the Darvall Cozy.
3) If the display shows the same fault code, contact a
qualified service technician to replace the PTC heater.
E04
Over Temperature
Sensor1 or Sensor2 at more than
alarm detection limit.
1) Discontinue Cozy Warm Air Blanket System warming
immediately. Disconnect Cozy heater hose nozzle
from the warm air blanket immediately
2) Press ON/OFF to eliminate the alarm immediately
and enter the standby mode. If not, the alarm sound
and indicator light flashing will continue
3) Fan stops working after 1 min.
4) If the display shows the same fault code, contact a
qualified service technician to replace the fan.
E05
Loss of power
1) After one alarm sounds, the device shut down
automatically.
2) Unplug Darvall Cozy Warm Air Heater and wait for 5
minutes.
3) Restart the Darvall Cozy.
4) If the same fault appears, contact a qualified service
technician.

16
Darvall Cozy Air Filter 0.2um HEPA - Routine Maintenance
The Darvall Cozy Warm Air Heater has a 0.2 um HEPA Air Filter at the intake air inlet, located on the
underside of the housing.
Replace the 0.2 um HEPA Air Filter every 500 hours or every 6 months or of use in normal
Veterinary Hospital environments. Change more frequently in dusty environments.
If the filter becomes obstructed with dust and hair the risk of contamination of the warmed
air with microbes may increase.
The warming efficiency of the Darvall Cozy Warm Air Heater depends on BOTH the
temperature and volume of flow of warmed air into the blanket. Regularly changing the filter
ensures maximum warming efficiency and will prolong the life of the Cozy Heater.
The Darvall Cozy Warm Air Heater is unique as it has been designed to facilitate easy
replacement of the 0.2 um HEPA Air Filter by the end-user. This should ensure that the filter
is replaced regularly, cost-effectively and without any inconvenience to clinical use.
There is Minimal Infection Risk using warm air heating during surgery in an appropriate manner.
For any sterile procedure, use of a new Darvall Warm Air Blanket is advisable. In human surgery,
compared to no warming, the use of forced warm air heating is associated with lower rates of
infection if the heater is properly maintained, the filter changed regularly and new warm air blankets
are used for each surgery.
The Darvall Cozy Warm Air Heater is intended to be used on wheels to elevate the heater above the
floor and minimize contamination of the HEPA Air Filter with dust and hair. If the Cozy Heater is not
mounted on wheels, and IV Pole Stand or Hung on a Kennel door, ensure that the Cozy Heater is not
placed on a soft or uneven surface since the air intake may become obstructed, causing the Darvall
Cozy to overheat.
Replacement of the air filter 0.2um HEPA
When Darvall Cozy Warm Air Heater runs for 500 hours, the indicator light on the ON/OFF button will
flash, the Darvall Cozy will then switch into standby mode and the LCD screen will display “Please replace
the filter”.
The air filter must be replaced
Replacement Air Filter: AAS PN 9704 –Darvall CozyTM Air Filter Cartridge 0.2um HEPA
Please Replace the Filter

17
Replacing the Darvall CozyTM HEPA Air Filter Tools: Phillips Head Screwdriver Time: 10
min
1. Note the date on the “Filter
Changed” label on the rear of the
Darvall Cozy Heater – change every
6 months OR 500 hours of use.
2. Disconnect the Cozy Heater from
the power source before
commencing air filter replacement.
3. Place the Cozy Heater on its top or
side on a padded surface (eg towel)
on a stable bench or table. If on its
side, the elbow Hose Outlet is on
the up side
4. Locate the filter cover plate on the
base (underside where the wheels
are) Use a Phillips-head
screwdriver to remove the 2
Phillips head screws on opposite
sides of the cover plate.
5. Lift the filter cover plate Off and
you should see the Pre-filter pad
6. Lift out the Pre-filter pad
7. Hold the “pull tabs” of the HEPA
filter and lift out. It should pull out
easily.
8. Open new filter box and take out the
HEPA air filter and “Filter Changed”
sticky label
9. Install the new HEPA filter as show
with “Pull tabs” facing out
10. Clean (vacuum) and re-install the
Pre-Filter (either side up)
11. Replace filter cover and the 2
Phillips Head screws.
12. Use a pen to write the date of filter
change on the new “Filter Changed”
sticky label. This label can be stuck
on the side of the Darvall Cozy
Heater or rear above the S/N label.
13. Check Wheels are firmly in position
and turn the Cozy Heater over and
stand on its wheels
14. Reconnect the Darvall Cozy Heater
to a grounded power source. It is
now ready to turn on power and
run
15. Press ON/OFF button on the front
control panel & hold for more than 30
seconds. The Run Time is cleared &
the Darvall Cozy Heater starts its
Self-Test Sequence (STS). Once
finished, the Heater goes back to
its “ready” state.
16. The Cozy Heater is ready to use.

18
Replacing the Darvall CozyTM Heater Hose Tools: None Time: 5 min
1. Disconnect the Cozy Heater from the power
source before commencing work.
2. Place the Cozy Heater on its side on a padded
surface (eg. towel) on a stable bench or table. The
Elbow Hose Outlet should be the UP side.
3. Press the Elbow Hose Outlet locking lever down
with your thumb.
4. There is a locking “lug”inside the Elbow Outlet on
the opposite side to the lever that retains the
Hose end. Gently tilt the Hose end towards the
heater body and lift the Hose upward and out.
5. Holding the heater hose with one hand, gently
lift it away from the Elbow Outlet on the side of
the heater body
6. You will notice a wire running from inside the
Heater Hose into the Elbow Outlet. This wire is
connects to Temperature Sensor 2 at the Nozzle
end of the Heater Hose.
7. With Heater Hose removal and installation of a
new hose, the temperature sensor wire MUST BE
disconnected (old hose) and re-connected (new
hose). If Temperature Sensor 2 is not connected,
the Darvall Cozy Heater WON’T RUN!
8. Disconnect Temperature Sensor cable plug inside
the Elbow Outlet. Note the plug is indexed so
only fits 1 way.
9. Remove the Darvall Hose Cover and install on the
NEW Heater Hose
10. Install the Temperature Sensor cable plug inside
the Elbow Outlet, plug is indexed so goes 1 way
11. Connect Heater Hose end to the Elbow Outlet.
Make sure the “lug” inside the Elbow Outlet is
engaged with the flange on the hose end.
12. Press the Elbow Hose Outlet locking lever down
with your thumb to the open position and left the
Heater Hose End into position, then release the
lever so it also engages the flange on the Heater
Hose end.
13. Place the Cozy Heater back on its wheels.
14. Reconnect the power supply and turn the Cozy
Heater on so it goes through the “Self Test
Procedure” to verify that the Hose End
Temperature Sensor 2 is correctly connected

19
Specifications and Darvall Cozy Heater Parameters
Physical Characteristics
Dimensions
11.0 inch High x 8.7 inch Deep x 8.7 inch Wide
(28cm High X22cm Deep X22cm Wide)
Weight
5.4 kg
Relative noise level
<55 db
Hose
Flexible, compatible with the Darvall Cozy warming system
Filtration system
High efficiency 0.2 µm filter
Recommended filter change
Every 12 months or 500 hours of use
Temperature Characteristics
Recommended operating environment
Temperature: 15 °C to 25 °C
Temperature control
Electronic control
Heat generated
750W (average)
Operating temperatures
Average temperatures at the end of the hose:
HIGH: 43 ±3°C
MID: 38 ±3°C
LOW: 32 ±3°C
Safety System
Thermostat
Independent electronic circuit; thermal cutoff shuts the
heater OFF to ensure hose end air remains below 53°C
(53°C ± 3°C typical); back-up over-temperature detection
at hose inlet.
Alarm system
Over-temperature (53°C, 53°C ± 3°C typical): red Over-
temp indicator light flashes, alarm sounds, heater and fan
shut down, operating indicator lights turn OFF, control
panel becomes unresponsive.
Fault
Fault information will display on the LCD, alarm sounds.
Over current protection
Dual input fused lines.
Electrical Characteristics
Heating element
1000W Resistive PTC
Leakage current
Meets IEC 60601-1 requirements
Fan motor
Operating speed: approximately 2900 rpm
No Load Airflow: 50cfm or 23 L/s
Power consumption
PEAK: 1500W AVERAGE:750W
Device ratings
110-120V; 60 Hz; 12A
30V ; 50/60 Hz; 8A
Power cord
5m, 3 Cond, 13 A (110V)
5m, 3 Cond, 10 A (220V)
Fuses
110-120V Darvall Cozy: 6C, 12A x1; 5C,12A x2;
220-240V Darvall Cozy: F8AL250V x1; F8AL250V x2;
Classification
Classified under IEC 60601-1 Guidelines (and other national
versions of the Guidelines) as Class I, Type BF, Ordinary
equipment, Continuous operation Not suitable for use in
the presence of flammable anesthetic mixtures with air or
with oxygen or nitrous oxide.
Device Directive as a Class IIb device (EU)
Device Directive as a Class II device (US FDA)
Note: The Darvall Cozy rating is 110-120V OR 220-240V & cannot be used simultaneously in both
voltage ranges. Please refer to SN label on the Darvall Cozy Heater to confirm correct voltage.

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Modes of Cozy Heater Operation
STS
Self-Test Sequence
PTC
Positive Thermal Coefficient Ceramic Heater
Sensor 1
Temperature Sensor in the hose outlet (inside of the hose nozzle)
Sensor 2
Temperature Sensor in the air outlet. (At the elbow of the hose)
Standby Mode
When entering Standby mode, the following events occur:
PTC heater turns off.
The fan turns off after 30 seconds delay.
The Hour Timer pauses.
Alarm and fault detection functions remain active.
The Darvall Cozy can be put into standby mode in one of the two
ways:
1) At power on with the power switch on the back panel;
2) If the Darvall Cozy is operating at one of the 4 operating
temperatures, to switch the Darvall Cozy into Standby mode,
press the ON/OFF button.
Operating Mode
When entering operating mode, the following events occur:
Unit will attempt to control the temperature as selected by
the illuminated Temperature Selection Button.
Fan operates.
Except in Ambient Temperature Mode, PTC (Positive Thermal
Coefficient Ceramic) heater will be activated.
Hour meter will be activated.
Temperature at the hose nozzle appears in the LCD display.
TEMP in RANGE indicator light illuminates when the
temperature at the blanket end of the hose is within ±3.0°C
of the selected setting; this indicator light does not
illuminate in Ambient Temperature Mode.
The Darvall Cozy can be put into operating mode by pressing the
ON/OFF button on the front control panel.