Gaymar Sof Matt User manual

P/N 11328-000 Rev A 10/10
®
OPERATOR'S MANUAL
SERVICE MANUAL
Sof•Matt®Low Air Loss
Mattress System
(see inside cover for applicable serial numbers)

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
Gaymar and Sof•Matt are registered in the U. S. Patent and Trademark Office.
© 2001. Gaymar Industries, Inc. All rights reserved. www.gaymar.com
Before you begin . . .
WARRANTY
Sof•Matt Low Air Loss Mattress Systems are
warranted against defects in material and
workmanship under normal use and operation from
the date of shipment for a period of one year.
During the warranty period, Gaymar will repair or
replace at its sole option, free of charge, any
defective parts or products returned with prior
authorization prepaid to Gaymar Industries, Inc.
See Incoming Inspection and Return Policy.
Warranty does not cover products abused, misused,
or altered outside factory. There are no obligations
on the 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 limited to, the
implied warranties of merchantability and of fitness
for a particular purpose.
APPLICABLE SERIAL NUMBERS
This service manual applies only to models RSM176S
(no configuration) and RSM180S configuration ‘A’
Sof•Matt Mattress Systems. The 8th character
of the serial number identifies the configuration.
For example, S/N RSM180S A B10042
identifies a configuration ‘A’ system.
IMPORTANT
Please read all precautions and instructions before
using the Sof•Matt®Low Air Loss Mattress System.
Maximum benefit to the patient at the greatest margin
of safety requires a thorough knowledge and
understanding of the correct operation and
application of the Sof•Matt Low Air Loss Mattress
System.
Users must follow the instructions and precautions
included with each mattress system prior to use.
Operate the equipment with the same care you
would use when operating precision medical
equipment.
INCOMING INSPECTION AND
RETURN POLICY
Check the shipping carton for damage immediately
after receipt. If damage is discovered, the product
should be unpacked with the carrier’s agent present.
Make a claim immediately to the carrier for the damage.
Do not return damaged goods without notifying the
carrier. If products damaged during shipment are
returned to Gaymar without notifying the carrier,
Gaymar will assume that repairs will be made at the
customer’s expense. Products returned to Gaymar
must be accompanied by Returned Goods (RG)
numbers. Returned Goods authorization and numbers
may be obtained by calling Gaymar Industries'
Customer Service Department:
Toll free: 1 800 828-7341
Direct: [phone]
When inquiring, please supply model and serial number,
purchase order number, whether merchandise was
bought on contract, and reason for return.
In general, deleted and outdated merchandise will not
be accepted for credit. A restocking charge of 15% will
be assessed on returns of current merchandise.
Ship returns prepaid to Gaymar Industries, Inc.,
10 Centre Drive, Orchard Park, NY 14127-2295.
Sof•Matt Low Air Loss Mattress Systems purchased by
individuals for home use must be returned to the
dealer from which they were purchased for repair.
SYMBOLS USED
Attention: consult accompanying documents
Dangerous voltage
Double insulated. When servicing, use only
identical replacement parts.
Type BF applied equipment
Pull red strap to rapidly deflate
mattress for performing CPR

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
1
CONTENTS
CONTENTS
Description Page
Contraindications/Indications/Precautions ..................................................... 2
Introduction .................................................................................................... 3
Operating Instructions ................................................................................... 4
Cleaning and Care .......................................................................................... 7
Specifications .................................................................................................. 8
Functional Check ............................................................................................ 9
Troubleshooting ........................................................................................... 12
Checking Cells for Leaks .............................................................................. 15
Maximum Pressure Test ............................................................................... 17
Mattress Replacement Parts ......................................................................... 20
Control Panel Calibration [advanced] .......................................................... 28
Replacing the Controllers ............................................................................ 32
ILLUSTRATIONS
Figure Description Page
1 Sof•Matt Mattress System .................................................................. 3
2 Support Boards .................................................................................. 3
3 Firmness Control ............................................................................... 4
4 Securing Linens with 'D' Rings ........................................................... 4
5 Visual Firmness Check ....................................................................... 5
6 CPR Plug............................................................................................. 6
7 Test Pin ............................................................................................ 10
8 Functional Check/Inspection Form .................................................. 11
9 Troubleshooting Matrix ................................................................... 12
10 Mattress Air Flow/Pressure Diagram .............................................. 17
11 Mattress Replacement Parts .......................................................... 20
12 RSM Sof•Matt Mattress .................................................................... 21
13 Upper Cell ........................................................................................ 21
14 Control Panel-to-Cell Connections ................................................ 22
15 Folding Lower Replacement Cells ................................................... 23
16 Panel Assembly ................................................................................ 25
17 CPR Dump Pin Assembly, Parts ..................................................... 27
18 Upper Cell Controller Parts .......................................................... 27
19 Calibration Test Bladder Setup ....................................................... 28
20 Adjustment Points for Calibration ................................................... 29
21 Pinch Points ...................................................................................... 30
22 Adjustment Points, Upper Cell Calibration ..................................... 31
23 Control Panel Parts ........................................................................ 35
24 Functional Test Kit ........................................................................... 36

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
PRECAUTIONS
2
SOF•MATT MATTRESS
PRECAUTIONS
CONTRAINDICATIONS
INDICATIONS
•Some medical conditions may not respond to this type of therapy.
Patient's skin condition should be inspected regularly.
If any redness or breaks in skin occur, consult a physician.
•Disinfect the mattress between patient installations, utilizing standard
hospital protocol and FDA approved disinfectants (such as a 10%
chlorinated bleach solution).
Failure to disinfect may risk cross-contamination and
infection.
•Keep bedding dry. Use incontinence pads if necessary.
Failure to keep the patient's skin clean and dry may lead to
maceration.
PATIENT
PRECAUTIONS
CAUTION
Air support therapy is not recommended when spinal stability is a concern.
This device is intended to help treat and prevent decubitus ulcers (bed sores).
WARNING
Electric shock hazard. Do not remove pump cover. Refer
servicing to qualified service personnel.
Double insulated. When servicing, use only identical
replacement parts.
•There are no operator serviceable parts within the equipment. Refer
servicing, maintenance and FUNCTIONAL CHECK AND SAFETY
INSPECTION to qualified technical personel familiar with good
practice for medical device repair.
•Always perform the FUNCTIONAL CHECK after making repairs and
before returning the Sof•Matt Mattress System to patient use.
Otherwise, personal injury, damage to the Sof•Matt Mattress
System or improper therapy may result.

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
3
INTRODUCTION
Gaymar Sof•Matt Low Air Loss Mattress Systems are designed to aid in the
prevention and treatment of pressure ulcers. The Sof•Matt Low Air Loss Mattress
System (fig. 1) has an internal air pump which maintains adequate pressure in its
upper and lower cells.
Please read and understand the precautions and instructions within this manual
before attempting to use the mattress system. Carefully follow the instructions
included with each mattress. In addition, we recommend that you request
in-service training from your Gaymar representative.
The mattress is designed for use on bed frames which provide firm, solid
support. Use otherwise may cause the mattress to be ineffective.
NOTE: •When the mattress is used on a link-spring bed frame, it may
cause the RSM mattress to sag. Additional support can be
provided by using three appropriately sized support boards. The
RSM mattress contains straps inside the bottom of its cover to
accommodate these boards and hold them in place. See figure 2.
•Support boards (Gaymar P/N 10623-000) are available from
your dealer. Boards may also be made as follows: Use 1/2" thick
interior grade plywood board, good both sides. Cut each board
to 33-1/2 inches (85 cm) long by 9 inches (23 cm) wide. Radius
all corners. Sand all surfaces and edges smooth. Make sure all
edges are rounded and smoothed to prevent wood slivers from
causing punctures, which are not covered by warranty.
INTRODUCTION
Figure 1—Sof•Matt Mattress System
Figure 2—Support Boards
PREPARING THE BED

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
4
OPERATING INSTRUCTIONS
NOTE: This product is not known to be susceptible to interference from
outside sources in its normal environment, non does it produce radiated
or line conducted emission that will interfere with other equipment in its
vicinity.
1. Place the Sof•Matt Mattress on the bed frame with the FOOT END markings
at the proper end of the bed, facing up (fig. 1, p. 3).
2. Plug the power cord into a polarized electrical outlet. The mattress will
immediately begin to inflate. The power cord is the only means to
disconnect this product from the supply (MAINS).
3. Position the Firmness Control (located behind the control panel flap) initially
as shown in figure 3.
Figure 3—Firmness Control
4. The patient may be placed on the mattress after 45 minutes. The heel
section will completely inflate within 90 minutes. For rapid inflation, insert
a portable inflator (e.g., Gaymar model SC505) into the CPR valve and
inflate for one minute. Replace the CPR plug quickly to prevent air from
escaping.
5. Apply linens, leaving the red CPR strap exposed.
SECURING LINENS (OPTIONAL)
To secure linens to the Sof•Matt Mattress, thread the four corners
through the D rings attached to the mattress (fig. 4). To ensure proper
therapy, do not pull linens taut. The linens should remain loose and wrinkly
on surface of mattress.
OPERATING
INSTRUCTIONS
Figure 4—Securing Linens with D Rings

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
OPERATING INSTRUCTIONS
5
CAUTION
1. If the patient appears to be bottomed when the head of the bed has been
raised to a sitting position (30° or more above horizontal), adjust the
firmness as described in step 6, page 4. When the bed is returned to a flat
sleeping position (0°), adjust as necessary for patient comfort.
2. To determine if the Sof•Matt Mattress is functioning properly, visually
check twice each day that the mattress is correctly inflated (fig. 5).
Turn the pressure control knob clockwise to increase firmness.
If the inflation is still incorrect at the maximum setting, remove from
service and contact your dealer.
3. To provide greater comfort, follow the procedure in step 6, page 4.
Check patient after changing setting to confirm that the mattress surface
is correctly inflated.
Some medical conditions may not respond to therapy of this type.
Check patient's skin frequently. Consult physician if any
redness or skin break occurs.
Serious injury could result if the patient's skin condition is
left unchecked.
MAINTAINING
PATIENT COMFORT
AND PROTECTION
Figure 5—Visual Firmness Check
Too Soft
Too Firm
6. Place the patient on the mattress. If necessary, the Firmness Control setting
may now be adjusted for patient comfort.
NOTE: When elevating the head of the bed above 30°,
the Firmness Control setting may need to be increased.

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
6
OPERATING INSTRUCTIONS
POWER OUTAGE/
PATIENT TRANSPORT
FEATURE
When power is removed from the mattress, therapy will be continued;
however, the height of the mattress will gradually begin to decrease.
To maintain therapy, power should be restored within 4 hours.
When transporting, unplug the power cord and bundle it on top of the
mattress to keep it from underfoot.
The lower cell will maintain internal cell pressure for approximately four hours.
The upper cell will partially deflate and the foot end will completely deflate.
DEFLATING THE
MATTRESS
The Sof•Matt Mattress can be deflated
for storage by pulling firmly on the red
CPR strap.
REINFLATING THE
MATTRESS
To reinflate, make certain to reinstall the CPR pin below the flap and to
resecure the retaining snap. Plug the system into a polarized electrical outlet.
The mattress will automatically inflate in approximately 90 minutes.
For rapid inflation, a portable inflator can be used by inserting it into the CPR
valve.
Figure 6—CPR Plug (pull strap to deflate)

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
7
1. Unplug the power cord from the electrical outlet.
2. To clean, use soap and water and a clean cloth to wipe down the power
cord and mattress. Do not use abrasive cleaners. Wipe dry with a clean
cloth. Do not autoclave.
NOTE: Blood and other body fluids must be thoroughly cleaned
from all surfaces before applying the disinfectant.
3. Apply an FDA approved disinfectant or 10% chlorinated bleach solution
(chlorinated bleach with 5.25% sodium hypochlorite) to the external
surfaces of the mattress.
Allow to completely dry. The solution contact time is what makes
disinfection effective.
4. Wipe down the mattress with a clean, dry cloth to remove any excess
disinfectant.
NOTE: •Mattress cover must be dry prior to storage or
application of linens.
•Failing to remove excess disinfectant could
eventually degrade the polyurethane coating of the
mattress cover.
CLEANING AND CARE
CLEANING AND CARE
Individual states have established rules and regulations pertaining to
the cleaning and sterilization of mattresses that are intended to be
resold, rented, or otherwise transferred from one user to another.
Some states prohibit reselling mattresses and require them to be
disposed of properly. Gaymar recommends contacting your state
bedding department to obtain information on your state's rules and
regulations if reusing, renting, or transferring mattresses.
Clean in accordance with the Cleaning and Care instructions above.
Plastic material should not be exposed to high temperature. Do not allow heat
lamps or heating pads to come close to the mattress cover. Do not autoclave.
Do not place sharp objects in contact with the mattress. Holes in the mattress
will degrade system performance.
STORAGE AND CARE,
SOF•MATT MATTRESS
AND COVER

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
8
SPECIFICATIONS
SPECIFICATIONS
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Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
FUNCTIONAL CHECK
CAUTION
•The FUNCTIONAL CHECK must be performed by qualified technical
personnel familiar with good practice for medical device repair.
Otherwise, damage to the Sof•Matt System and
improper therapy may result.
•Testing will verify proper operation of the Sof•Matt System.
Always perform the FUNCTIONAL CHECK after making repairs.
Record each maintenance check on the INSPECTION FORM
(fig. 8, p. 11).
Operation of the Sof•Matt System at other than specified
operating pressures can result in poor or reduced patient
support. Improper repair can result in patient injury.
TOOLS REQUIRED
• Functional Test Kit (P/N 78281-000—see fig. 24, p. 35)
• Manometer, 0-50 mm Hg (± 1 mm Hg accuracy)
Operate the Sof•Matt Mattress for at least two hours at nominal
120VAC line voltage prior to performing the Operating Pressure Test.
NOTE: Perform steps 1-3 prior to the two-hour warm-up.
1. See figure 7 (p. 10). Use the Functional Test Kit (fig. 24, p. 35). Replace the
CPR plug with the test pin. Connect the female CPC connector and hose
to the manometer.
2. • To measure lower cell pressure—Connect the shortest tube (L) from
the test pin to the connector on the manometer.
• To measure foot cell pressure—Connect the medium length tube (F)
from the test pin to the connector on the manometer.
• To measure upper cell pressure—Connect the longest tube (U) from
the test pin to the connector on the manometer.
3. Turn the Firmness Control knob to the lowest position (Softer), at
approximately 8 o'clock. After a two-hour warm-up, the cell pressures
should be:
•lower cell pressure: 25.0 ± 2.0 mm Hg;
•foot cell pressure: 5.5 ± 2.0 mm Hg;
•upper cell pressure: 12.0 ± 2.0 mm Hg.
1. OPERATING
PRESSURE TEST
9
FUNCTIONAL CHECK

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
FUNCTIONAL CHECK
10
4. Turn the Firmness Control knob to the highest position (Firmer), at
approximately 5 o'clock. After the system stabilizes, the cell pressures
should be:
• lower cell pressure: 25.0 ± 2.0 mm Hg;
• foot cell pressure: 5.5 ± 2.0 mm Hg;
•upper cell pressure: 32.0 ± 3.0 mm Hg.
5. If the pressure(s) in steps 3or 4 are not met, see Troubleshooting, page 12.
NOTE: When testing has been completed, remove the manometer
and test pin. Replace the original CPR dump plug.
1. OPERATING
PRESSURE TEST
(continued)
Figure 7—Test pin
The internal pump contained within the mattress system has double
insulated construction. It is not necessary to measure current leakage.
However, if you choose to do so, refer to UL 2601-1, Clause 19.
2. CURRENT
LEAKAGE
3. GROUND
RESISTANCE Measuring ground resistance is not applicable to the internal pump.
Double insulated appliances are permitted to have two-conductor
cords (refer to NFPA 99--Standard for Health Care Facilities, paragraph
9-2.1.2.2).

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
11
Figure 8—Functional Check and Safety Inspection Form
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FUNCTIONAL CHECK AND
SAFETY INSPECTION FORM

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
12
TROUBLESHOOTING
1.
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Possible Causes:
1. Leak in connection to foot cell or to outlet of foot check valve.
2. Leak in foot cell (see p. 16)
3. Foot check valve malfunctioning.
Remedies:
1. Use O ring lubricant on elbow to foot cell if the leak is here—use
wire tie or cut tube shorter by 1/4" to foot check valve.
2. Replace upper cell.
3. Replace panel assembly.
2.
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Possible Causes:
1. Lower cell controller out of calibration
2. CPR plug not inserted all the way.
3. Larger O ring or middle O ring leaks—may be cracked or dried out.
4. Loose or disconnected tubing.
5. Leak in lower cell and/or foot cell.
Figure 9—Troubleshooting Matrix
TROUBLESHOOTING
OK=within specification
LOW=less than spec.
HIGH=greater than spec.
Field calibration of
the panel assembly is
not normally feasible.
See Ordering Parts,
page 20.
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Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
13
TROUBLESHOOTING
Remedies:
1. Replace panel assembly.
2. Reinsert plug and snap.
3. Replace O ring if cracked—lubricate with O ring lubricant if dry.
4. Reconnect, wire tie, or cut 1/4" off loose tube and reconnect.
5. Replace leaking cell(s).
3.
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Possible Causes:
1. Lower cell controller out of calibration.
2. Ball is stuck in foot check valve.
3. Orifice in the power outage check valve is plugged or valve is
stuck closed.
Remedies:
1. Replace panel assembly.
2. Replace panel assembly.
3. Replace panel assembly.
4.
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Possible Causes:
1. Lower cell controller and/or check valve are/is out of calibration.
2. Low air loss line from the lower cell controller is restricted.
3. Orifice in the power outage check valve is plugged or valve is
stuck closed.
4. Restriction in the 0.013" dia. orifice machined in the check valve.
Remedies:
1. Replace panel assembly.
2. Remove the restriction from the low air loss line connected to
the lower cell controller (brass).
3, 4. Remove restriction from orifice.
NOTE: Never insert a drill into the orifice.
TROUBLESHOOTING
(continued)

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
14
5.
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Possible Causes:
1. Larger or middle size O ring on CPR dump pin assembly is leaking.
2. Leak in a tube connection between the upper cell controller and
entrance to the upper cell.
3. Leak in upper cell.
4. Damper bag has a leak.
5. Upper cell controller out of calibration.
Remedies:
1. Replace O rings. Lubricate with O ring lube (silicone grease).
2. Repair leak at connection. Use wire tie or cut tube shorter by 1/4".
3. Replace upper cell.
4. Replace damper bag.
5. Replace panel.
6.
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Possible Causes:
1. Pump is not running or runs intermittently—damaged cord or plug.
2. CPR plug almost or actually disengaged.
3. Leaks in upper cell and/or damper bag and lower cell (repeated
punctures with hypodermic needle).
Remedies:
1. Plug in pump. If the power cord is damaged, replace panel assembly.
2. Insert CPR plug and snap the fastener. Lubricate O rings with
O ring lubricant if they are dry.
3. Check for leaks (see pp. 15-16) and replace cells.
TROUBLESHOOTING
(continued)
TROUBLESHOOTING

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
15
CHECKING CELLS
FOR LEAKS
EXCESSIVE NOISE
7.
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Possible Causes:
1. Patient pressure setting knob is set too high.
2. Upper cell controller out of calibration.
3. Low air loss line to upper cell controller is restricted.
Remedies:
1. Lower the patient pressure setting.
2. Replace the panel.
3. Remove restriction in the low air loss line connected to the upper
cell controller.
The Sof•Matt Mattress System is designed to produce noise levels less than
40 dB(A) per ASTM E1574-95 except at a distance of 36", when the patient
weight setting controller is set to the maximum setting position. If the internal
pump produces excessive noise, replace the panel assembly.
To check the lower cell for leaks:
1. Prepare the test setup described in Operating Pressure Test, step 2, page 9.
See also figure 7, page 10.
2. Connect the manometer assembly to the lower cell (shortest tube on
test pin). The pressure should be 25.0 ± 2.0 mm Hg. Then, connect
the manometer assembly to the foot cell (medium length tube). The
pressure should be 5.5 ± 2.0 mm Hg. If both pressures are met, the
lower and foot cells are OK. If not, proceed to step 3.
3. Pinch the tubing between the outlet port from the foot check
valve and the in-line tee (pinch point #3, fig. 10, p.17).
4. Connect the manometer assembly to the lower cell. It should
read 25.0 ± 2.0 mm Hg. If it meets pressure, the lower cell and
the circuitry to it are OK. If it doesn't reach at least 23.0 mm Hg,
proceed to step 5.
5. Take one finger and press against the valve body outlet of the
CPR body to stop the flow into the lower cell. This will have to be
done by pressing on the upper layer of the cell. Use care not to
damage the urethane. With flow to the lower cell being stopped
and the tubing still being pinched at pinch point #3, take another
reading at the test pin (fig. 7). If the pressure now reads at least
23.0 mm Hg, the lower cell or the connection to it has a leak. If
the leak is not at the connection, replace the cell. Use soap to
check connections. If the pressure is less than 23 mm Hg, replace
the panel. Release pinch point #3.
At this point, we have a non-leaking lower cell.
TROUBLESHOOTING
(continued)
CHECKING LOWER
CELL FOR LEAKS

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
16
CHECKING CELLS
FOR LEAKS
CHECKING
UPPER CELL AND
DAMPER BAG
FOR LEAKS
To check the foot cell for leaks:
1. Connect the manometer assembly to the foot cell (medium length
tube on test pin) as described in Operating Pressure Test, step 2,
page 9. The manometer will display the pressure of the foot cell.
2. Pinch the tubing at pinch point #4 (fig. 10).
3. Read the manometer pressure. If the pressure at this point is
approximately 5.5 mm Hg with pinch point #4 closed, but less
when the pinch point is released, the foot cell has a leak. The
entire upper cell will have to be replaced since the foot cell is part
of the entire upper cell.
4. Having already established that the lower cell is within spec,
we should see a pressure of 5.5 ± 2.0 mm Hg just ahead of the
foot cell when pinch point #4 is pinched. If this pressure is not
within spec, the foot check valve is defective. Replace the panel.
To check the upper cell and damper bag for leaks:
1. Connect the manometer assembly to the upper cell (longest tube
on the test pin) as described in Operating Pressure Test, step 2, page 9.
The manometer will display the pressure of the upper cell.
2. Set the patient pressure setting valve to the lowest setting
(full counterclockwise) position.
3. Read the manometer pressure. It should read 12.0 ± 2.0 mm Hg.
If it does, turn the patient pressure setting valve to the highest setting
(full clockwise) position. It should read 32.0 ± 3.0 mm Hg.
4. Return the patient pressure setting valve to the lowest setting,
full counterclockwise position.
5. Pinch the tubing at pinch point #2 (fig. 10) and the manometer should
indicate above the spec. If the pressure in the upper cell is within spec,
the connection to the cell or the cell itself is leaking. If a soap test of
the connection to the cell does not show a leak, replace the upper
cell. If the pressure does not fall within spec when pinch point #1 is
closed, proceed to step 6.
6. Pinch the tube at pinch point #2. If the pressure in the upper cell falls
within spec, but it didn't when pinch point #1 was closed, there is a
leak between these two points. Leak test all joints (with soap solution)
between the two pinch points. Also, leak test around the plug of the
CPR dump valve. There may be a leak by the larger O ring. If this is
the case, replace or lubricate the O ring. If the pressure in the damper
bag is less than 10 mm Hg and remains the same whether pinch point
#1 or pinch point #2 is pinched, there is either a leak in the damper
bag or the upper cell controller is out of calibration. See Calibrating the
Upper Cell, page 31.
CHECKING FOOT
CELL FOR LEAKS

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
17
MAXIMUM
PRESSURE TEST Operate the Sof•Matt pump for at least two hours at nominal
120VAC line voltage prior to performing the Maximum Pressure Test.
To test the lower cell pressure controller for maximum pressure during a fault
condition:
1. Connect the manometer assembly to the lower cell (shortest tube on the
test pin) as described in Operating Pressure Test, step 2, page 9. See figure 7,
page 10.
2. Clamp the low air loss line at point #4 (fig. 10).
3. Take one finger and press against the CPR valve hose outlet to stop the air
flow into the lower cell. This will have to be done by pressing on the upper
layer of the cell (near point C, figure 14, page 22). Use care not to damage
the urethane.
To test the lower cell
pressure controller
Figure 10—Mattress Air Flow/Pressure Diagram
MAXIMUM
PRESSURE TEST

Sof•Matt®Low Air Loss Mattress System
Operator's/Service Manual
18
To test the upper cell
pressure controller
To test the upper cell pressure controller for maximum pressure during a fault
condition:
1. Connect the manometer assembly to the upper cell (longest tube on test
pin) as described in Operating Pressure Test, step 2, page 9. See figure 7,
page 10.
2. Turn the Firmness Control knob to the 8 o'clock position.
3. Plug or clamp the low air loss line at point #2 (fig. 10, p. 17).
4. Pinch the 1/2" ID tubing at point #1 (fig. 10) using 8" needle nose pliers.
5. Allow the pressure reading to stabilize.
6. If the pressure is less than or equal to 45 mm Hg, the upper cell pressure
controller passes the test. If the pressure is greater than 45 mm Hg, it has
failed the test. Check that the 0.025" diameter orifice connected to the
low air loss line is not restricted.
NOTE: • Never insert a drill into the orifice.
• If the pressure is still greater than 45 mm Hg, replace the
panel assembly.
• After completing the test, remove the plug or clamp from
point #2 (fig. 10) on the low air loss line.
NOTE: When testing has been completed, remove the test pin and
replace the CPR plug removed in step 1.
MAXIMUM
PRESSURE TEST
(continued)
4. Allow the pressure reading to stabilize.
5. If the pressure is less than or equal to 45 mm Hg, the lower cell pressure
controller passes the test. If the pressure is greater than 45 mm Hg, it has
failed the test; check that the 0.025" diameter orifice mounted on the CPR
dump valve relief valve is not restricted. Also, make sure that the 0.013"
diameter orifice machined into the check valve is not restricted. If the
reading is still greater than 45 mm Hg, replace the panel assembly.
NOTE: • Never insert a drill into the orifice.
• After completing the test, remove the clamp from point
#4 (fig. 10) on the low air loss line.
• The results of this test are valid only if the mattress panel
assembly has operating pressures within specification
(see Operating Pressure Test, pp. 9-10).
MAXIMUM PRESSURE
TEST