Service Manual ®

FW400 Series Blood/Fluid Warmer

FW400/FW401/REF FW403
Blood/Fluid Warmer

Service Manual

P/N 11079-000 12/00

 Service Manual
FW400 Series Blood/Fluid Warmer

Before you begin . . .

Table of Contents
Important
Section Description Page Before using the Medi-Temp II model FW400/FW401/
REF FW403 ("FW400 series") Blood/Fluid Warmer, please
1.0 Indications for Use/
read and understand the Operator's Manual and its SAFETY
Safety Precautions .... inside cover
PRECAUTIONS prior to each application.
2.0 Repair Policy/
Return Authorization .......... 1 Review the SAFETY PRECAUTIONS in section 1.1 of
this Service Manual prior to performing service.
3.0 Description ........................ 2
4.0 Technical Specifications .... 4 If you have any questions, please contact your
5.0 Controls and Indicators ...... 5 local dealer for assistance.
6.0 Cleaning ............................ 5
7.0 Functional Check and 1.0 Indications for Use
Safety Inspection ............... 6
This device is intended to aid in the prevention of inadvertent
8.0 Troubleshooting ................ 10 hypothermia during administration of blood, blood products,
9.0 Repair/Replacement and other fluids.
Procedures ....................... 12
10.0 Drawings/Parts List .......... 16
11.0 Wiring Diagram ................. 18 1.1 Safety Precautions
12.0 Resistance/Temperature
Chart ................................ 20 DANGER

Risk of electric shock. Refer servicing to

qualified medical equipment service personnel.

WARNING

Repairs should be performed only by qualified

medical equipment service personnel in
accordance with this Service Manual.
Otherwise, damage to the Blood/Fluid Warmer
and improper therapy may result.

CAUTION

• Do not immerse the Warmer in cleaning or

disinfectant solutions. Do not submerge it in
liquids; it is fluid-resistant, not fluid-proof.
Immersion could result in malfunction or
equipment damage.

• For grounding reliability of the Blood/Fluid Warmer,

plug only into a properly grounded outlet.
Medi-Temp II is a trademark of Gaymar Industries, Inc.
© 2000. Gaymar Industries, Inc. All rights reserved. www.gaymar.com
Service Manual
FW400 Series Blood/Fluid Warmer

2.0 Repair Policy 2.3 Out-of-Warranty Repairs

For customers who repair FW400 series Blood/Fluid Warmers Within the USA:
at their location, this manual contains information to allow a
The following repair options are available when local
qualified biomedical technician to make necessary repairs.
servicing is elected:
1. Defective Component
2.1 Limited Warranty Replacement parts can be ordered. Specify the
The FW400 series Blood/Fluid Warmer is warranted free of Gaymar part number. Refer to the parts list in
defects in material and workmanship under normal use and section 10 of this manual.
operation for a period of one year, under the terms and
2. Machine Repairs
conditions of the Gaymar warranty in place at time of
If the Warmer becomes inoperative and the cause
purchase. During the warranty period, Gaymar will repair or
of the problem cannot be determined, the complete
replace at its sole option, free of charge, any defective parts
Warmer can be returned to the factory for servicing
or products returned with prior authorization prepaid to
at the purchaser's expense.
Gaymar Industries.
Outside the USA:
Warranty does not cover products abused, misused, or
altered outside the factory. There are no obligations on the Contact your local dealer.
part of Gaymar for consequential damages arising out of or
in connection with the use or performance of the product.
Gaymar disclaims all implied warranties including, but not 2.4 Return Authorization
limited to, the implied warranties of merchantability and of Please contact Gaymar to obtain an RG (Returned Goods)
fitness for a particular purpose. number prior to returning the Warmer.
NOTE: • Warmers will not be accepted for repairs unless
2.2 In-Warranty Repairs they have been cleaned and disinfected.
All in-warranty field repairs must be authorized by Gaymar's • Warming Sets will not be accepted for return
Technical Service Department before proceeding. During the unless they are in the original, unopened, sterile
warranty period, Gaymar will repair or replace at its sole packaging.
option, free of charge, any defective parts or products
returned with prior authorization prepaid to Gaymar
Please contact your local dealer or Gaymar Industries at:
Industries.
Phone: 1 800 828-7341
(716) 662-2551
Fax: 1 800 993-7890
(716) 662-0748

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 Service Manual
FW400 Series Blood/Fluid Warmer

3.0 Product Description 3.1 Warmer (See figure 1)

The Medi-Temp II FW400 series Blood/Fluid Warmer is a The Medi-Temp II FW400 series Blood/Fluid Warmer is a
simple, dry heat device designed for safe and rapid in-line sealed, fluid-resistant device. A lighted on/off circuit breaker
warming of blood, blood products, and other fluids through is located on the side panel. An LED temperature display is
the utilization of disposable Blood/Fluid Warming Sets. The located on the front panel. Fluid temperature is indicated in
Warmer does not provide fluid flow rate control. Blood, blood degrees Celsius on the display. Also located on the front of
products, and other fluids at temperatures 10ºC and below the unit is a slot for insertion of the Blood/Fluid Warming
will be warmed to between 36°C and 43°C at flow rates of 10 Set's cassette. On the side of the unit is a holder for the
to 300 ml/min. Room temperature fluids (20°C) can be bubble trap.
warmed at flow rates up to 500 ml/min. The disposable
Blood/Fluid Warming Sets are available in Standard, Standard The Blood/Fluid Warmer can be placed in an X-Ray cassette
with Extensions, Pediatric, and High Flow models. slot within an operating room table or on horizontal surfaces.
An integral pole clamp also allows the unit to be pole
mounted. A kit for vertical mounting (P/N 78264-00) is
available.

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2
 Service Manual
FW400 Series Blood/Fluid Warmer

3.2 Disposable Warming Sets Each Warming Set consists of a flexible cassette (for
(see figure 2) insertion into the warmer) and a bubble trap with a manual air
eliminator. They are designed for use below 300 mm Hg
The Medi-Temp II FW400 Series Blood/Fluid Warmer is pressure with hospital standard intravenous (IV)
designed to be used with Gaymar D25000 Series Blood/Fluid administration sets and venipuncture sets utilizing luer type
Warming Sets only. The following Blood/Fluid Warming Sets connectors. Each Warming Set also has input and output
are available for use at this time. Check with your local dealer pinch clamps. See figure 2.
for more details. The Standard Warming Set is designed for use at 300 ml/min
or lower flow rates. The Standard Warming Set with
Extensions provides the user with added patient lead length
(0.6 m; 2 ft). The priming volume of the Standard Warming
Set is 39 ml. The priming volume of the Standard Warming
Set with Extensions is 48 ml.
The Pediatric Warming Set has a lower priming volume of
30 ml. Its patient connection lead utilizes thicker walled
G
tubing to provide added insulation at the lower pediatric
warming flow rates.
The High Flow Warming Set uses leads having a larger inner
A diameter. This reduces restriction during circumstances
requiring rapid infusion. The priming volume of the High Flow
Warming Set is 79 ml. The High Flow Warming Set also
D B incorporates a 200 micron filter and larger bubble trap.

Description Catalog N o.
C
Standard D25340CE
F
Standard with Extensions D25310CE
D
Standard with Extensions (60") D25315CE

E Pediatric D25320CE

Hi g h F l o w D25330CE

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Figure 2—Medi-Temp II FW400 Series Blood/Fluid Warmer—

Standard Warming Set

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 Service Manual
FW400 Series Blood/Fluid Warmer

3.3 Theory of Operation controller uses this RTD information to control the fluid
(refer to section 10, Drawings/Parts List temperature to a nonadjustable set point of 43.0°C by
applying power to the heaters via an optocoupler and triac on
and section 11, Wiring Diagram) the PC board. The sensed temperature is displayed on the
The Medi-Temp II FW400 series Blood/Fluid Warmer temperature controller's display (which is viewable from the
electrically consists of: front of the Warmer). The controller activates audible alarm
circuitry on the PC board and also provides a visual display
• power entry module and detachable power cord of the temperature if the RTD sensed temperature goes above
• lighted on/off circuit breaker 45°C or below 34°C.
• heater plate assembly
• RTD sensor Two bimetallic thermostats mounted on the heater plate
• dual heaters assembly will also interrupt power to the heaters in the event
• temperature controller of a Warmer failure. See section 5.4.
• two bimetallic thermostats
• PC board containing audible alarm circuitry and
heater/controller interface circuitry.

The Warmer connects to line voltage via the power inlet and a
detachable power cord. The lighted circuit breaker provides
overcurrent protection as well as on/off function. An RTD
sensor on the inside surface of the heater plate assembly
senses blood/fluid temperature when a Warming Set
Cassette is inserted into the Warmer. The temperature

4.0 Technical Specifications

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Service Manual
FW400 Series Blood/Fluid Warmer

5.0 Controls and Indicators 5.4 Over Temperature °c

Safety Thermostats
5.1 Electronic System Self Check
®

Each time the Warmer is turned on, it performs a self-check

In the event of Warmer failure, there are two mechanical
(about 2 seconds) before lighting the display. If a problem is
thermostats that will interrupt power to the heaters.
detected, an error code will be displayed and the Warmer
must be removed from use. The first thermostat will turn off the heaters, activate the
audible alarm and turn the display blank.
5.2 Temperature Control The second thermostat will interrupt power to the Warmer if
the first one fails.

The Medi-Temp II FW400 series Blood/Fluid Warmer Cold fluid through the Warming Set can be used to reset the
noninvasively senses fluid temperature on the surface of the thermostats. The unit must be turned off, then back on to
Warming Set Cassette. At steady state, the Warmer indicates reset the alarm circuits.
approximately 43.0°C on its display. Output fluid temperature
will be 36°C–43°C for 10°C input fluid temperature. Fluid °c
5.5 Control Alarm - LO
temperature is affected by fluid flow rate as shown in figure 3 ®

below.
7\SLFDO)OXLG7HPSHUDWXUH If the sensed fluid temperature drops below 34ºC, the
):6HULHV Warmer will activate an audible alarm, and the display will

alternately indicate the word "LO" and the temperature.




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 6.0 Cleaning

 CAUTION

 Do not immerse the Warmer in cleaning or
       disinfectant solutions. Do not submerge it in liquids;
)ORZ POPLQ it is fluid-resistant, not fluid-proof.
Figure 3—Typical fluid temperature vs. flow values Immersion could result in malfunction or
equipment damage.

Room temperature fluid may be warmed at flow rates up to

500 ml/min.
Unplug unit prior to cleaning.

5.3 Control Alarm - hI

°c
To clean the external surfaces of the Warmer, use a
®
nonabrasive cleaning solution (such as warm soapy water).
Spray or wipe solution on with a clean cloth. Wipe off
If a fluid temperature over 45ºC is sensed by the Warmer, it contaminants and rinse with water.
turns the heaters off and activates an audible alarm. The
display will alternately indicate the word "hI" and the To clean the cassette slot, flush with cleaning solution over a
temperature. sink. (The slot is open at the end to facilitate draining.) Use
the thin brush (Gaymar P/N 10027-000) supplied with the
The audible alarm may be silenced during this condition by Warmer to clean inside the slot. Rinse slot with warm water.
turning the unit off then on again.
Wipe Warmer dry with a clean, dry cloth.
If the fluid temperature drops below 45ºC, the unit will
resume normal operation. Apply a disinfectant such as 10% chlorinated bleach solution
(chlorinated bleach with 5.25% sodium hypochlorite) to the
Warmer and cassette slot and allow to dry.

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FW400 Series Blood/Fluid Warmer

7.0 Functional Check and Safety Inspection • Clean and dry compressed air source
To assure optimum performance, dependability, and safety, • Current Leakage/Ground Resistance Tester
the following should be performed every twelve months or as
specified in the facility's preventive maintenance program.
• AC Voltmeter
The Medi-Temp II FW400 series Blood/Fluid Warmer is rated
When performing the following procedures, pay particular IPX4—splashproof. To insure against ingress of liquids into
attention to test setups. Any deviation from the setups, the machine, it is important that the labels, covers, and
procedures, or test equipment may result in incorrect or screws be kept in good condition. Replace labels that are
misleading results. The following test procedures will peeling, ripped, or illegible.
verify proper operation of the FW400 series Medi-Temp II
Blood/Fluid Warmer. 7.1 Physical Inspection
WARNING Check that the following items are in good condition and
secure. Replace if necessary.
Always perform the Functional Check and Safety • Screws
Inspection after making repairs and before returning
the Warmer to patient use. • Labels, if peeling or missing
Failure to perform the Functional Check and • Cover on the on/off circuit breaker
Safety Inspection could result in death or serious
injury, equipment damage, or malfunction of the • Bubble trap bracket
Warmer. • Pole clamp
• Power entry module
Inspection Form • Power cord and plug
An Inspection Form (figure 5, page 9) is provided to facilitate
and document the inspection process. 7.2 Calibration / Overtemp Check
Equipment or tools required The Medi-Temp II Blood/Fluid Warmer's electronic controller
and RTD sensor system is calibrated at a flow rate of 100 ml
The following test equipment (or equivalent) is required to per minute with a set point of 43.0°C. Verify correct output
perform the Functional Check and Safety Inspection: temperature as follows:
• Gaymar Standard Blood/Fluid Warming Set, [CALIBRATION CHECK]
model D25340CE
1. Connect test setup as in figure 4. Use a standard
• Temperature Measurement Device (see figure 4, page 7) Blood/Fluid Warming Set (model D25340CE) with
Gaymar FWT1 Temperature Sensor connected to
• Temperature sensor (Gaymar catalog FWT1) and an
the output of the bubble trap. An alternate method is
ohmmeter (accuracy,1.5% of reading; maximum
to put a hole in the top of the bubble trap and insert
excitation current of 100 µA) and the resistance/
a Temperature Measurement Device waterproof
temperature chart (see figure 10);
sensor into the bubble trap (to the bottom). This
or,
measurement method will require sealing the
• Waterproof temperature sensor/meter with an
bubble trap hole around the sensor. See figure 4.
accuracy of ± 0.3°C across the range 30°C to 60°C
and a thermal time constant of 2 seconds 2. Connect the FWT2 Flowmeter or flow measurement/
or faster. control device to the output of the FWT1
Temperature Sensor; or, if using the sensor in the
• Flow Measurement Device (see figure 4)
bubble trap method, connect the FWT2 Flowmeter
• Fluid source with calibrated flow meter with a or flow measurement/control device directly to the
minimum accuracy of ± 12 ml/minute (Gaymar output of the D25340CE Warming Set. Insure room
FWT2 Flowmeter); ambient temperature is 20° to 24°C.
or,
3. Flow room temperature water at 100 ml per minute
• Fluid source with adjustable flow control. Use a
(cc/min) through the Warmer. Verify bubble trap is
stop watch and graduated cylinder to adjust
maintained 1/2 to 2/3 full.
flow rate.

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Service Manual
FW400 Series Blood/Fluid Warmer

Figure 4—Temperature Measurement Test Setup

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FW400 Series Blood/Fluid Warmer

4. Turn Warmer on and allow to run for 10 minutes. 7.3 Controller “LO” Alarm Check
5. After 10 minutes, verify output water temperature is 1. Turn Warmer on without a Warming Set in place.
43.0°C ±1.1°C. If using the FWT1 Temperature Allow display to stabilize at approximately 43.0°C.
Sensor and an ohmmeter, verify thermistor
temperature sensor is within the range of 1019 to 2. Using a compressed air nozzle pointed into the
1112 ohms (see resistance/temperature chart, disposable slot at the exit port relief (see figure 1),
figure 10). If not within this range, recheck the test flow compressed air. This will cool the sensor and
setup. See section 8.6. should reduce the display temperature to below
34°C. Insure the audible alarm activates and the
[OVERTEMP CHECK] word “LO” alternately flashes on the display when
below 34°C. If it does not, see section 8.2.
6. Verify the flow is still 100 ml per minute. Remove
the test switch access screw (item I, figure 1).
Using an electrically nonconductive tool, push and 7.4 Ground Resistance Test
hold switch S2. This will force the heater on. The
display temperature will rise. Use a current leakage/ground resistance tester to
measure the resistance between the ground pin on
7. Verify that the audible alarm sounds and the word the power plug and either of the two stainless
“hI” is alternately flashed on the display when the screws on the bottom side of the Warmer (item 35,
display temperature surpasses 45°C. If it does not, figure 8B). The resistance value should not exceed
see section 8.2. 0.50 ohms. If it does, see section 8.8.
8. Continue to hold the S2 switch. Using the
temperature measurement equipment, read the 7.5 Current Leakage Test
output resistance/temperature at the instant the
display blanks with the alarm still sounding. This is Measure the maximum earth leakage current
the trip point of the S3 over temperature safety (ground open). Measure at all combinations of
thermostat. The thermostat trip point (alarm
• line polarity
sounding, display off) should be 48.6°C to 58.4°C,
• neutral open/closed
or within a FWT1 Temperature Sensor range of 856
to 594 ohms. If it is not, replace it. See section 9.4. Measure with the heater on in the neutral closed
test. If the leakage values exceed the values listed
NOTE: The Warmer display value should not be
on the Inspection Form (figure 5, page 9), see
used for this test.
section 8.9.
NOTE: The S4 thermostat is designed to open at
temperatures above the S3 thermostat.
It is a secondary fire protection device.; it
is not a patient safety device. When the
S4 thermostat trips, the entire unit
(display, audible, and heater) turns off.
The S4 thermostat is tested at Gaymar
before each unit is shipped. Gaymar does
not recommend testing the S4 thermostat
in the field.

9. Turn Warmer off but continue to allow flow of water.

This will cool the Warmer.
10. Turn Warmer back on. If the audible alarm sounds
at power up, the thermostat is still activated. Turn
Warmer off again to allow more time for cooling.
11. Inspect the O ring on the test switch access screw.
Replace the O ring if necessary. Reinstall the test
switch access screw.

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Service Manual
FW400 Series Blood/Fluid Warmer

7.6 Inspection Form

FW400 Series Blood/Fluid Warmer

Functional Check and Safety Inspection Form

Serial Number ___________________

Item O b s e r v a t io n Results

7.1 Physical Inspection OK? Screws Yes/No

L ab e ls Yes/No

Cover on the on/off switch Yes/No

Bubble trap/holder Yes/No

Pole clamp Yes/No

Power entr y module Yes/No

Power cord and plug Yes/No

7.2 Calibration Check Does fluid measure 43.0°C ±1.1°C? Yes/No

Over temp Alarm Check Does alarm activate above 45°C? Yes/No

S3 Over Temperature Safety Does output temperature remain within 48.6°C Yes/No
Thermostat Check to 58.4°C?

Was the test switch access screw reinstalled? Yes/No

7.3 Controller "LO" Alarm Check Does alarm activate below 34°C? Yes/No

7.4 Ground Resistance Check Is ground resistance <0.5 ohms? Yes/No

7.5 Current Leakage Test

F W 400 (neutral closed) Is ear th leakage <100µA? Yes/No
F W 400 (neutral open) Is ear th leakage <200µA? Yes/No
F W 401 (neutral closed) Is ear th leakage <75µA? Yes/No
F W 401 (neutral open) Is ear th leakage <125µA? Yes/No
F W 403 (neutral closed) Is ear th leakage <175µA? Yes/No
F W 403 (neutral open) Is ear th leakage <300µA? Yes/No

Figure 5—Inspection Form

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FW400 Series Blood/Fluid Warmer

8.0 Troubleshooting

    

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Service Manual
FW400 Series Blood/Fluid Warmer

  


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 Service Manual
FW400 Series Blood/Fluid Warmer

9.0 Repair/Replacement Procedures 9.1 General Disassembly/Reassembly

Disassembly:
To identify replacement parts, refer to figure 8A/8B.
To order replacement parts, contact your local 1. Unplug Warmer.
dealer or Gaymar Industries. 2. Remove top label.
3. Remove the 19 cross-recess screws from the top
cover. Do not remove screws from the bottom
NOTE: Any repair that opens the
cover.
Warmer requires removal and
replacement of the top label. 4. Remove top cover.
Do not attempt to reuse the
Reassembly:
old label.
1. Insure the frame O ring is in place. Replace top
cover and 19 screws (use the 17 black screws
around the perimeter).
WARNING
2. Perform the Functional Check and Safety
• Use only Gaymar replacement parts as Inspection. See section 7.
identified in the parts lists (see figures 8A/
3. Install new top label.
8B). Using substitute parts could result
in Warmer malfunction or patient injury.
9.2 Replacing the Controller
• Repairs should be performed only by
qualified medical equipment service To replace the controller (item 13, figures 8A/8B), you will
personnel in accordance with this Service need to replace the top label (item 7) and the front label (item
Manual. Otherwise, damage to the 15). Replace the frame O ring (item 27) if necessary. Use
Blood/Fluid Warmer and improper RTV sealant (item 6) as described.
therapy may result. 1. Unplug Warmer.
• Always perform the FUNCTIONAL CHECK 2. Remove top label.
AND SAFETY INSPECTION (pp. 6-9) after
making repairs and before returning the 3. Remove 19 cross-recess screws from top cover.
Warmer to patient use. Document your Do not remove screws from the bottom cover.
findings on the INSPECTION FORM (p. 9). 4. Remove top cover.
Failure to perform the Functional Check
and Safety Inspection could result in 5. Disconnect PC board cable and RTD wires from
death or serious injury, equipment the controller's terminal block by loosening the
damage, or malfunction of the Warmer. screws on the terminal block. Note the routing of
the cable and wires.
6. Remove the front label.
CAUTION
7. Remove controller retainer (item 38, fig. 8A/8B)
• The bottom cover of the Warmer should by removing 2 cross-recess screws.
not be removed before the top cover. 8. Remove controller gasket.
Blind removal of the bottom cover may
damage the Warmer. 9. Slide controller out the front of unit.

• The Warmer is designed to be fluid- 10. Place a thin bead of RTV sealant around bezel of
resistant by utilizing sealants and gaskets. new controller, then insert controller back into
Inspect gaskets and labels during housing.
reassembly. Replace any that are 11. Reconnect PC board cable and RTD wires to
damaged to maintain this fluid resistance. controller terminal block.
Failure to retain this fluid resistance
could result in Warmer malfunction. NOTE: Route the cable and wires as originally
found.

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FW400 Series Blood/Fluid Warmer

12. Calibrate the Warmer output. See section 9.6, 11. Replace top cover and 19 screws (use the 17
Calibrating the Warmer Output. black screws around the perimeter). Insure the
frame O ring is in place.
13. Inspect/reinstall controller gasket. Replace if
damaged. 12. Perform Functional Check and Safety Inspection.
See section 7.
14. Replace controller retainer and screws.
13. Clean off any adhesive left on the cover from the
15. Replace top cover and 19 screws (use the 17
old label. Install new top label. Use RTV sealant
black screws around the perimeter). Insure the
on the threads of two screws (item 35, fig. 8B).
frame O ring is in place.
16. Perform Functional Check and Safety Inspection.
See section 7. 9.4 Replacing Thermostats
17. Clean off any adhesive left on the frame from the To replace either of the thermostats (items 16 and 17, figures
old label. Install new front label. 8A/8B), you will need to replace the top label (item 7).
Replace the frame O ring (item 27) if necessary. Use RTV
18. Clean off any adhesive left on the cover from the sealant (item 6) as described.
old label. Install new top label. Use RTV sealant
on the threads of two screws (item 35, fig. 8B). 1. Unplug Warmer.
2. Remove top label.
9.3 Replacing the PC Board Assembly 3. Remove 19 cross-recess screws from top cover.
Do not remove screws from the bottom cover.
To replace the PC board assembly (items 23, 24, or 25;
figures 8A/8B), you will need to replace the top label (item 7) 4. Remove top cover.
and use heat sink compound. Replace the frame O ring (item 5. Remove the two thermostat mounting screws
27) if necessary. Use RTV sealant (item 6) as described. and lockwashers. Remove thermostat.
1. Unplug Warmer. 6. Disconnect thermostat wires from terminal block
2. Remove top label. of PC board assembly.
3. Remove 19 cross-recess screws from top cover. 7. Replace thermostat, two thermostat mounting
Do not remove screws from the bottom cover. screws, and lockwashers. Do not use heat sink
compound.
4. Remove top cover.
8. Reconnect thermostat wires to PC board
5. Disconnect all wires from terminal block of PC assembly terminal block. Refer to figure 8B and
board. Disconnect wires from circuit breaker. wiring diagram (figure 9) for correct wiring. Be
6. Remove the four screws which mount the PC sure to tape the wires as shown in figure 8B.
board assembly to the lower plate. Remove the 9. Replace top cover and 19 screws (use the 17
screw and lockwasher which mounts the triac. black screws around the perimeter). Insure the
7. Remove the PC board. Do not remove the PC frame O ring is in place.
board insulation from the unit. 10. Perform Functional Check and Safety Inspection.
8. Apply heat sink compound to the new triac heat See section 7.
sink surface. Install triac using screw and 11. Clean off any adhesive left on the cover from the
lockwasher. Install new PC board assembly using old label. Install new top label. Use RTV sealant
four screws. on the threads of two screws (item 35, fig. 8B).
9. Reconnect all wires to PC board assembly
terminal block. Refer to figure 8B and the wiring
9.5 Replacing the RTD/Heater Assembly
diagram (figure 9) for correct wiring.
If the RTD/Heater Assembly requires repair or replacement,
10. Reconnect wires to circuit breaker (brown wire
please return the Warmer to your local dealer or Gaymar
on top).
Industries. See Return Authorization (section 2.4, page 1).

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FW400 Series Blood/Fluid Warmer

4. Flow room temperature fluid at 100 ml per minute

through the Warmer. Insure bubble trap is maintained
1/2 to 2/3 full.
5. Turn Warmer on and allow display to stabilize at
approximately 43.0°C.
6. Measure output water temperature. The correct
output water temperature is 43.0°C ±1.1°C.
If using FWT1 and an ohmmeter, the range should be
within 1112 to 1019 ohms. See the Resistance/
Temperature Chart (figure 10).
7. If output water temperature is not within specification,
calculate the offset needed to obtain correct output.
The goal temperature is 43.0°C.
If current output temperature is too high, a positive
(or more positive) offset should be used. If the output
temperature is too low, a negative (or more negative)
offset should be used. See figure 7.

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9.6 Calibrating the Warmer Output ƒ& ƒ&   >@
To calibrate the Warmer output, you will need push-button ƒ& ƒ&   >@
keys (Gaymar P/N 10109-000; see figure 6 above).
Figure 7—Sample Offset Calculations
1. Connect Warmer test setup as shown in figure 4.
Use a Standard Blood/Fluid Warming Set (model 8. With the front label, controller retainer, and controller
D25340CE) with an FWT1 Temperature Sensor gasket removed from the Warmer, insert the
connected to the output of the Warming Set. An push-button keys onto the face of the controller
alternate method is to put a hole in the top of the (“set” button on the left).
bubble trap and insert a temperature measurement
device sensor into the bubble trap (to the bottom). NOTE: The following three steps allow access to the
This measurement method will require sealing the calibration offset menu location. These steps may be
bubble trap hole around the sensor. repeated at any time to view the current offset
condition or make an adjustment in it.
2. Connect the FWT2 Flowmeter or flow measurement/
control device to the output of the FWT1 9. Depress both the “up arrow” and “down arrow”
Temperature Sensor; or, if using the sensor in the buttons simultaneously until the letters “Aut” appear
bubble trap method, connect the FWT2 Flowmeter on the controller display. Depress the “up arrow” or
or flow measurement/control device directly to the “down arrow” key until the letters “Pid” appear.
output of the D25340CE Warming Set. Insure 10. Hold down the “set” button and depress either the
ambient room temperature is 20° to 24°C. “up arrow” or “down arrow” button until “yes”
3. Power up Warmer. appears in the display, then release the “set” button.
11. Depress the “down arrow” button to index the display
DANGER to indicate “CAL”.
12. Press the “set” button and hold it while pressing the
Risk of electrical shock when parts are
“up arrow” or “down arrow” button to enter the offset
electrified.
value calculated from step 7.

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FW400 Series Blood/Fluid Warmer

NOTE: The next step is used to return to the current 15. Perform Functional Check and Safety Inspection.
measured temperature from any place in the menu. See section 7.
13. Depress both the “up arrow” and “down arrow” 16. Clean off any adhesive left on the cover from the old
buttons for three seconds until the measured label. Install new top label. Use RTV sealant on the
temperature appears in the display. threads of two screws (item 35, fig. 8B).
14. Repeat step 6 to verify correct output temperature.
Repeat steps 7 through 13 as needed. 9.8 Replacing the Circuit Breaker
15. Inspect/reinstall controller gasket. Replace if To replace the circuit breaker (items 1, 2, or 3, figures
damaged. 8A/8B), you will need to replace the top label (item 7), on/off
label (item 8), and use RTV sealant (item 6). Replace circuit
16. Replace controller retainer and screws.
breaker gasket (item 4), circuit breaker cover (item 5), and
17. Perform Functional Check and Safety Inspection. frame O ring (item 27) if necessary.
See section 7.
1. Unplug Warmer.
18. Clean off any adhesive left on the frame from the
old label. Install new front label. 2. Remove top label.
3. Remove 19 cross-recess screws from top cover.
9.7 Replacing the Power Inlet Assembly
4. Remove top cover.
To replace the power inlet assembly (item 12, figures 8A/8B),
5. Disconnect the wires from circuit breaker.
you will need to replace the top label (item 7) and use RTV
sealant (item 6). Replace the frame O ring (item 27) as 6. Remove on/off label.
necessary.
7. Remove two cross-recess retainer mounting
1. Unplug Warmer. screws and remove retainer.
2. Remove top label. 8. Remove cover.
3. Remove 19 cross-recess screws from top cover. 9. Remove gasket.
4. Remove top cover. 10. Remove circuit breaker from frame.
5. Disconnect blue and brown wires from circuit 11. Apply RTV to underside of circuit breaker lip and
breaker. install new circuit breaker into frame. Insure circuit
6. Remove the nut and lockwasher from the ground breaker is positioned so that the off position is
terminal and disconnect the ground wire. closest to corner of frame.
7. Remove the two cross-recess mounting screws 12. Reinstall gasket, then cover.
holding the power inlet assembly.
13. Replace retainer and screws.
8. Remove assembly from Warmer.
14. Reconnect wires to circuit breaker, so that the
9. Scrape away old RTV sealing material from frame. brown wires are on top, blue wires are on bottom,
10. Insert new power inlet assembly through gasket into and the wires from the power inlet are connected to
frame after applying RTV to frame hole. the terminals on the circuit breaker labelled “line”.

11. Replace screws. 15. Replace top cover and 19 screws (use the 17 black
screws around the perimeter). Insure the frame O
12. Reconnect ground wire to ground terminal. Place ring is in place.
lockwasher on terminal first, then ground wire, then
second lockwasher, and then the nut. Insure nut is 16. Perform Functional Check and Safety Inspection.
tight. See section 7.
13. Reconnect wires to circuit breaker (brown wire on 17. Clean off any adhesive left on the cover from the old
top). label. Install new top label. Use RTV sealant on the
threads of two screws (item 35, fig. 8B).
14. Replace top cover and 19 screws (use the 17 black
screws around the perimeter). Insure frame O ring 18. Clean off any adhesive left on the cover from the old
is in place. label. Install new on/off label.

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FW400 Series Blood/Fluid Warmer

10.0 Drawings/Parts List NOTE: Most replacement tasks will require more than one of the parts
in figures 8A/8B. Refer to section 9 before ordering parts.

Item Description Par t N umber Item Description Par t N umber

1 Circuit breaker (FW400, 120V) 90961- 013 28 Top cover kit 78130- 000

2 Circuit breaker (FW401, 100V) 90961- 013 Bottom cover kit (FW400) 78166- 000

3 Circuit breaker (FW403, 220V–240V) 90961- 014 29 Bottom cover kit (FW401) 78169- 000

4 Circuit breaker gasket 10086- 000 Bottom cover kit (FW403) 78167- 000

5 Circuit breaker cover 10087- 000 30 Power cord (120V) 1 0 0 3 1 - 0 00

6 RTV sealant (electrical) 91056- 001 31 Power cord (100V) 1 0 0 3 1 - 0 00

7 Top label 09999- 000 Power cord (220V–240V):

8 On/off label 10002- 000 Power cord (Continental Europe) PC001

9 Bubble trap bracket 10044- 000 Power cord (U nited Kingdom) PC002

10 Clamp 10043- 000 Power cord (Australia) PC003

32
11 Swivel head screw 91439- 000 Power cord (Switzerland) PC004

12 Power inlet assembly 0 9 9 7 7 - 0 00 Power cord (Italy) PC005

13 Controller kit 78165- 000 Power cord (Denmark) PC006

14 Controller gasket 09966- 000 Power cord (Israel) PC007

15 Front label 10567- 000 33 PC board insulator 1 0 0 6 2 - 0 00

Screws, 6-32 x 0.312 long, flat head, 82°,

16 Thermostat assembly, S3 (close on rise) 10576- 000 34 91476- 058
steel, black oxide (17 per side, 34 total)

Screws, 6-32 x 1/4 long, SS, flat head,

17 Thermostat assembly, S4 (open on rise) 10576- 001 35 91275- 057
82° (2 per side, 4 total)

19* RTD/heater assembly (120V) N /A 36 Screw, self-sealing 91474- 021

20* RTD/heater assembly (100V) N /A 38 Controller retainer 09952- 000

21* RTD/heater assembly (220V-240V) N /A 39 Circuit breaker retainer 09947- 000

22* Heater plate O ring N /A 40 Screw, self-sealing 91474- 007

23 PC board assembly (FW400, 120V) 1 0 1 8 5 - 0 01 41 Power cord lock (not shown) 7 8 1 5 8 - 0 00

24 PC board assembly (FW401, 100V) 1 0 1 8 5 - 0 01 42 Push-button keys for controller (see fig. 6) 1 0 1 0 9 - 0 00

25 PC board assembly (FW403, 220V–240V) 1 0 1 8 5 - 0 00 43 Spacer 10010- 000

26 Bumper 90566- 004 44 Triac 90709- 002

27 Frame O-ring 09975- 000 45 Ver tical mounting kit (not shown) 7 8 2 6 4 - 0 00

* Do not attempt to replace the RTD/heater assembly or heater plate O ring. See 9.5, page 13.

Figure 8A—Parts List

16
Service Manual
FW400 Series Blood/Fluid Warmer

Power Cords
(Item 32)

To release wires from

terminal block, insert a
small screwdriver in
slot nearest wire and
pull towards center.
End View End View
Clamp Open

Figure 8B—Assembly Drawing

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 Service Manual
FW400 Series Blood/Fluid Warmer

11.0 Wiring
Diagram

ATTENTION
Static-Sensitive
Devices

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Service Manual
FW400 Series Blood/Fluid Warmer

FW303
&
FW403

FW300A/
FW400
&
FW301/
FW401

Figure 9—Wiring Diagram

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 Service Manual
FW400 Series Blood/Fluid Warmer

12.0 Resistance/Temperature Chart

for Gaymar FWT1 Temperature Sensor
7HPS 5HVLV 7HPS 5HVLV 7HPS 5HVLV 7HPS 5HVLV 7HPS 5HVLV 7HPS 5HVLV 7HPS 5HVLV

ƒ& RKPV ƒ& RKPV ƒ& RKPV ƒ& RKPV ƒ& RKPV ƒ& RKPV ƒ& RKPV

             

             

             

             

             

             

             

             

             

             

             

           

           

           

           

           

           

           

           

           

           

           

           

           

           

           

           

           

           

           

           

           

           

           

           

           

           
Figure 10—
           
Resistance/
            Temperature
            Chart

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FW400 Series Blood/Fluid Warmer

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FW400 Series Blood/Fluid Warmer

Authorized CE representative (Europe):

USA—TEL: USA—FAX: International: INVATECH GmbH & Co.
1 800 828-7341 1 800 993-7890 (716) 662-8636 TEL Wandsbeker Königstraße 27-29
(716) 662-2551 (716) 662-0748 (716) 662-0730 FAX D 22041 Hamburg, Germany