FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY
Service and
Parts Manual
SF-1920 Part No. 10559400 Rev AA4 (10/25/19)
PowerMax
PM-1
PM-3
PM-4
Model Numbers:
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Style B
* Indicates multiple pages due to model / serial number break(s)
Table Of Contents
GENERAL INFORMATION
Symbols .................................... iii
Ordering Parts .......................... iii
Serial Number Location ........... iii
Specifications ........................... iv
Model Identification /
Compliance Charts .................. v
Warranty Information............... vi
OPERATION &
TROUBLESHOOTING
Theory of Operation.................... A-2
COMPONENT TESTING
Pump Filters .................................. B-2
Check for Leaks ............................ B-3
Vacuum Switch ............................. B-4
Exhaust Mufflers ........................... B-9
Check Valve ................................... B-10
Low Voltage ................................... B-12
Fuse ................................................ B-14
On/Off Switch ............................... B-16
ACCESS PROCEDURES
Vacuum Switch Cover ................C-2
Electrical Box Cover ...................C-3
WIRING DIAGRAMS
PowerMax Models
PM-1 .............................................. D-2*
PM-3 .............................................. D-3*
PM-4 .............................................. D-4*
EXPLODED VIEWS / PARTS LISTS
PowerMax Models
PM-1, PM-3, PM-4 ..................E-2
General
Information
Section C
Section D
Section E
Section A
Section B
Rev 7/14/17
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iii
© Midmark Corporation 2007 SF-1920
General Information
AA215700
Symbols
In Section A, test the components in the order indicated.
(ex.
1st
then,
2nd
)
Refer to Section B for component testing procedures.
The symbols below may be used in this manual to represent
the operational status of table functions and components.
Indicates the function / component is working properly.
No action required.
Indicates the function / component is working,
but a problem exists.
Indicates the function / component is not working at all.
Ordering Parts
The following information is required when ordering parts:
• Serial number & model number
• Part number for desired part.
[Refer to Exploded Views / Parts Lists section]
Non-warranty parts orders may be faxed to Midmark using
the Fax Order Form in the back of this manual.
For warranty parts orders, call Midmark's Service
Department with the required information.
Customer Service: 1-800-643-6275
Technical Service: 1-888-279-1260
33
33
3
33
33
3
General Information
33
33
3
Equipment Alert
Indicates a potentially hazardous situation
which could result in equipment damage if not avoided.
DANGER
Indicates an imminently hazardous situation which
will result in serious or fatal injury if not avoided. This
symbol is used only in the most extreme conditions.
WARNING
Indicates a potentially hazardous situation which
could result in serious injury if not avoided.
CAUTION
Indicates a potentially hazardous situation which may
result in minor or moderate injury if not avoided. It may also be
used to alert against unsafe practices.
Serial / Model
Number Location
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iv
© Midmark Corporation 2007 SF-1920
General Information
PowerMax Surgical Suction Systems
Weights, Dimensions, Electrical Specifications
www.Midmark.com • 1-800-Midmark • www.Documark.com
AA214000
Model Users
Height
(IN.)
Width
(IN.)
Depth
(IN.)
Weight
(LBS.)
HP
Voltage
(50/60 Hertz)
Breaker
Size per
Pump
(Amps)
Tank
Capacity
(GAL)
CFM
Maximum
PM-1 1 31" 32" 25" 150 3/4 208-230 @ 5.1 Amp 20 20 8
PM-3 2-3 31" 32" 25" 210 1.5 208-230 @ 9.7 Amp 20 20 16
PM-4 3-4 34" 38" 27" 290 2.25 208-230 @ 14.3 Amp 20 32 24
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v
© Midmark Corporation 2007 SF-1920
General Information
Model Identification / Compliance Chart
UL 60601-1
CAN
#601.1-M90
VAC Amps Cycles (Hz)
PM-4
PowerMax Surgical Suction System 3
4 User
Complies To:
Electrical Supply
Requirements:
Model
Description
PM-1
PowerMax Surgical Suction System 2
3 User
PM-3
X
X
X
X
PowerMax Surgical Suction System 1
User
Configurable
X
Configurable
X
50/60
5.1
208 / 230
208-230
13.8
50/60
208 / 230
9.7
50/60
Configurable
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vi
© Midmark Corporation 2007 SF-1920
General Information
Limited Warranty Information
SCOPE OF WARRANTY
Midmark Corporation (“Midmark”) warrants to the original purchaser its new PowerMax products and components (except for components not warranted
under “Exclusions”) manufactured by Midmark to be free from defects in material and workmanship under normal use and service. Midmark’s obligation
under this warranty is limited to the repair or replacement, at Midmark’s option, of the parts or the products the defects of which are reported to Midmark
within the applicable warranty period and which, upon examination by Midmark, prove to be defective.
APPLICABLE WARRANTY PERIODAPPLICABLE WARRANTY PERIOD
The applicable warranty period, measured from the date of installation for the original user, shall be:The applicable warranty period, measured from the
date of installation for the original user, shall be:
• PowerMax Surgical Suction Vacuums: Two (2) years or 1,500 usage hours (whichever comes first)
EXCLUSIONS
This warranty does not cover and Midmark shall not be liable for the following: (1) repairs and replacements because of misuse, abuse, negligence,
alteration, accident, freight damage, or tampering; (2) products which are not installed, used, and properly cleaned as required in the Midmark
“Installation” manual and or “maintenance” guide for this applicable product; (3) products considered to be of a consumable nature; (4) accessories or
parts not manufactured by Midmark; (5) charges by anyone for adjustments, repairs, replacement parts, installation, or other work performed upon or in
connection with such products which is not expressly authorized in writing in advance by Midmark.This warranty does not cover and Midmark shall not
be liable for the following: (1) repairs and replacements because of misuse, abuse, negligence, alteration, accident, freight damage, or tampering; (2)
products which are not installed, used, and properly cleaned as required in the Midmark Installation manual and or maintenance guide for this
applicable product; (3) products considered to be of a consumable nature; (4) accessories or parts not manufactured by Midmark; (5) charges by anyone
for adjustments, repairs, replacement parts, installation, or other work performed upon or in connection with such products which is not expressly
authorized in writing in advance by Midmark.
EXCLUSIVE REMEDY
Midmark’s only obligation under this warranty is the repair or replacement of defective parts. Midmark shall not be liable for any direct, special, indirect,
incidental, exemplary, or consequential damages or delay, including, but not limited to, damages for loss of profits or loss of use.Midmark’s only
obligation under this warranty is the repair or replacement of defective parts. Midmark shall not be liable for any direct, special, indirect, incidental,
exemplary, or consequential damages or delay, including, but not limited to, damages for loss of profits or loss of use.
NO AUTHORIZATION
No person or firm is authorized to create for Midmark any other obligation or liability in connection with the products.No person or firm is authorized to
create for Midmark any other obligation or liability in connection with the products.
THIS WARRANTY IS MIDMARK’S ONLY WARRANTY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSOR IMPLIED. MIDMARK MAKES NO IMPLIED
WARRANTIES OF ANY KIND INCLUDING ANY WARRANTIES OF MERCHANTABILTY OR FITNESS FOR ANY PARTICULAR PURPOSE. THIS WARRANTY IS
LIMITED TO THE REPAIR OR REPLACEMENT OF DEFECTIVE PARTS.THIS WARRANTY IS MIDMARK’S ONLY WARRANTY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESSOR IMPLIED. MIDMARK MAKES NO IMPLIED WARRANTIES OF ANY KIND INCLUDING ANY WARRANTIES OF MERCHANTABILTY
OR FITNESS FOR ANY PARTICULAR PURPOSE. THIS WARRANTY IS LIMITED TO THE REPAIR OR REPLACEMENT OF DEFECTIVE PARTS.
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Troubleshooting
Section A
A-1
© Midmark Corporation 2007 SF-1920
Troubleshooting
Section A
Function / System Page
Theory of Operation .............................. A-2
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© Midmark Corporation 2007 SF-1920
A-2
Troubleshooting
Models:
Serial Numbers:
All
Theory of Operation
Troubleshooting Page
Low Suction in Operatories ................... A-3
High Vacuum Level ............................... A-4
Pump - Motor Overheats ....................... A-5
Cycles with No Vacuum Being Used ..... A-6
Runs with No Suction at Operatory ....... A-7
Will Not Run .......................................... A-8
Theory of Operation
Air is drawn from the operatories through
a Surgical Operatory Recover Room
Package to an ASME-certified reservoir
and then into the pump inlets. Rapidly
rotating vanes propel the air to the
discharge of the pump, producing vacuum
levels in the range of 13-20 inches of
mercury ("Hg).
Vacuum level is adjustable by adjusting
the pump "on-off" points at the vacuum
switch. A vacuum gauge provides moni-
toring of vacuum level.
A low voltage relay allows "on-off" opera-
tion of the PowerMax from a remote unit
in the operatories.
Single pump unit supply a maximum flow
rate of 8 cubic feet per minute (cfm); dual
pump units deliver 16 cfm while triple
pump units provide 24 cfm.
CAUTION
Motors are thermally protected
and will have line voltage applied to them
when the tank vacuum level is below the
minimum setpoint, either could cause the
system to restart without warning.
Pump exhaust can cause eye or skin
damage. Keep air stream airways from
face and hands.
Equipment Alert
PowerMax units use rotary
vane vacuum pumps that require no
lubrication. Service life of carbon
vanes will be reduced by petroleum
products. Verify all local codes.
Vacuum Storage Tank
AA214100
Vacuum
Switch
Low
Voltage
Control
Vacuum Line From
Operatories
L1
L2
Incoming Power
From Dedicated
20A Circuit
Electrical Box
Switch 1
Switch 3
Switch 2
Check
Valve
Check
Valve
Check
Valve
Pump 1
Pump 3Pump 2
Optional Exhaust Kit
Vent To
Outside
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© Midmark Corporation 2007 SF-1920
A-3
Troubleshooting
Models:
Serial Numbers:
Vacuum System
Problem: Low Suction in Operatories
Refer To: Page
Pump Filters ......................................... B-2
Check for Leaks .................................... B-3
Vacuum Switch ..................................... B-4
All
Vacuum System
Flush Vacuum Pump
Order Midmark Flushing Solvent, 77000699.
Flushing instructions are included with solvent.
3rd
33
33
3
Replace Pump Filters
Refer to: Section B Pump Filters
33
33
3
1st
Replace Vanes
Pump vanes are worn and need replaced.
Replacement instructions are included with the vanes.
33
33
3
4th
Adjust Vacuum Switch
Refer to: Section B Vacuum Switch
5th
33
33
3
Replace Collection Canister
Canister in operatory is full.
6th
33
33
3
Check Vacuum Lines
Refer to: Section B Check for Leaks
Repair any damaged or collapsed vacuum lines.
33
33
3
2nd
AA217600
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© Midmark Corporation 2007 SF-1920
A-4
Troubleshooting
Models:
Serial Numbers:
Refer To: Page
Pump Filters ......................................... B-2
Vacuum Switch ..................................... B-4
All
Vacuum System
Vacuum System
Problem: High Vacuum Level
Replace Pump Filters
Refer to: Section B Pump Filters
33
33
3
1st
Adjust Vacuum Switch
Refer to: Section B Vacuum Switch
3rd
33
33
3
AA217900
Check Vacuum Lines
Repair any damaged or collapsed vacuum lines.
2nd
33
33
3
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© Midmark Corporation 2007 SF-1920
A-5
Troubleshooting
Models:
Serial Numbers:
Vacuum System
Problem: Pump / Motor Overheats
(Operating Temperature Measured at Pump Exhaust is 180° or Higher)
Refer To: Page
Pump Filters ......................................... B-2
Exploded Views and Part Numbers ....... E-1
All
Vacuum System
Replace Pump Filters
Refer to: Section B Pump Filters
33
33
3
1st
Check Vacuum Lines
Repair any plugged, damaged or collapesed vacuum lines.
33
33
3
2nd
Flush Vacuum Pump
Order Midmark Flushing Solvent, 77000699.
Flushing instructions are included with solvent.
4th
33
33
3
Replace Vanes
Pump vanes are worn and need replaced.
Replacement instructions are included with the vanes.
33
33
3
5th
Check Equipment Room Temperature.
Temperature should be -40°to 104° Fahrenheit
-4 to 37 Celsius
6th
33
33
3
Clean Vacuum / Motor Vents
7th
33
33
3
Listen for Noise in Motor
If noises are heard from the motor, bearings
are defective. Replace motor/pump.
8th
33
33
3
WARNING
Pump Motors are thermally protected with an
automatic reset and may start without warning.
Check Exhaust Mufflers and Piping
Clean exhaust mufflers with a rag.
Check exhaust piping for damaged or collapsed pipes.
33
33
3
3rd
AA218000
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© Midmark Corporation 2007 SF-1920
A-6
Troubleshooting
Models:
Serial Numbers:
Refer To: Page
Check Valve ......................................... B-8
Check for Leaks .................................... B-3
All
Vacuum System
Vacuum System
Problem: Cycles with No Vacuum Being Used
Clean or Replace Check Valve
Refer to: Section B Check Valve
33
33
3
1st
Check for Leak in PowerMax or Piping System
Refer to: Section B Check for Leaks
33
33
3
2nd
AA218100
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© Midmark Corporation 2007 SF-1920
A-7
Troubleshooting
Models:
Serial Numbers:
Vacuum System
Problem: Runs with No Suction at Operatory
All
Vacuum System
Check Vacuum Lines
Repair any damaged or collapsed vacuum lines.
Verify Inlet Ball Valve is Opened
33
33
3
1st
33
33
3
2nd
AA218200
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© Midmark Corporation 2007 SF-1920
A-8
Troubleshooting
Models:
Serial Numbers:
Refer To: Page
Vacuum Switch ..................................... B-4
Low Voltage .......................................... B-13
On/ Off Switch (Testing) ....................... B-15
Fuse ..................................................... B-12
All
Vacuum System
Vacuum System
Problem: Will Not Run
Verify Switches in Electrical Box Are On
1st
Check Fuse
Refer to: Section B Fuse
6th
Check Voltage in Breaker
Note: If circuit breaker is tripped, measure voltage at the line
side of the vacuum switch while the unit is running. Voltage
should be in the range of
208-230. Voltage outside this range
may result in failure to start and possible damage to unit.
Install a buck/boost transformer as required.
2nd
Check Low Voltage
Refer to: Section B Low Voltage
3rd
Check On/Off Switch
Refer to: Section B On/Off Switch
4th
Check Vacuum Switch
Refer to: Section B Vacuum Switch
5th
WARNING
High Voltage. When testing
components with power on use
care to prevent electrical shock.
Rev. 3/10
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© Midmark Corporation 2007 SF-1920
A-9
Troubleshooting
Models:
Serial Numbers:
WARNING
Pump Motors are thermally protected with an
automatic reset and may start without warning.
Problem Probable Cause Correction
Pump vanes sticking. Clean pump with Midmark flushing solvent.
Pump vanes worn.
Replace vanes.
Vacuum switch "off" point set too low. Adjust vacuum switch.
Disposable collection canister in operatory full. Replace canister.
Vacuum switch "on" point set too high. Adjust vacuum switch.
Exhaust muffler dirty or exhaust piping plugged.
Remove and clean metal exhaust muffler.
Disassemble, inspect and clean exhaust system
as necessary. Verify outside exhaust vent is open.
Dirt buildup in pump chamber.
Clean pump with Midmark flushing solvent.
Pump vanes worn. Replace vanes.
Excessive ambient temperature in equipment room.
Check that installation site is properly vented and ,
if necessary, air conditioned to prevent ambient
temperature from exceeding 104 degrees
Fahrenheit.
Vacuum lines plugged, damaged or collapsed.
Pump filters dirty. Replace filters.
Vacuum lines plugged, damaged or collapsed. Repair lines.
Repair lines.
Pump overheats
(Operating Temperature
measured at pump Exhaust is
180 degrees Fahrenheit or
Higher)
Low Suction in Operatories
Pump filters dirty. Replace filters.
Vacuum lines plugged, damaged or collapsed. Repair lines.
High Vacuum Level at
PowerMax
Pump filters dirty. Replace filters.
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© Midmark Corporation 2007 SF-1920
A-10
Troubleshooting
Models:
Serial Numbers:
Problem Probable Cause Correction
Pump check valve's) leaking. Clean or replace check valve.
Leak in PowerMax or piping system.
Check for leaks by allowing PowerMax to reach 20
Hg and shut down. Close the receiver tank inlet
valve to isolate unit from piping system. Do not
use any vacuum from piping system for several
minutes. If the vacuum gauge continues to drop
while inlet valve is closed, the leak is within the
unit. If the vacuum gauge maintains the same
reading, but drops after opening the inlet valve,
the leak is in the piping system.
Motor overloaded due to problem with vacuum pump. See " Pump Overheats".
Motor bearings defective. Listen for noisy bearings. Return unit to Midmark for repair.
Motor dirty. Clean / vacuum motor vents.
PowerMax inlet ball valve closed. Open inlet ball valve.
Open or damaged vacuum piping. Repair Vacuum lines.
Tank drain valve open. Close drain valve.
Service switches in PowerMax electrical box in "Off" position.
Each PowerMax pump has its own on-off switch.
Verify that each switch in the electrical box is in
the "On" position.
Electrical Component is not working properly. Check Line Voltage.
Fuse blown. Check fuse.
Low Voltage. Check Low Voltage.
PowerMax Cycles with No
Vacuum Being Used
Motor Overheats; Thermal
Overload Shuts Down Motor
(See Warning at beginning of
Troubleshooting Table)
PowerMax runs but there is no
suction in the operatory.
PowerMax will not run
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Section B
Testing & Repair
B-1
© Midmark Corporation 2007 SF-1920
Components Page
Pump Filters ......................................... B-2
Check for Leaks .................................... B-3
Vacuum Switch ..................................... B-4
Exhaust Mufflers ................................... B-9
Check Valve ......................................... B-10
Low Voltage .......................................... B-12
Fuse ..................................................... B-14
On/Off Switch ...................................... B-16
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© Midmark Corporation 2007 SF-1920
Testing & Repair
B-2
Models:
Serial Numbers:
Filters
All
Filters
Function and Location
Atmospheric air is drawn in through inlet filter before flowing to the
vacuum/motor and exhaust air is released through the outlet filters.
Filters protect the pump/motor from moisture and debris. Filters
should be changed annually.
Outlet Filter
Inlet Filter
www.midmark.com:
File Name
Filter Replacement .................... 10542100
AA217300
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© Midmark Corporation 2007 SF-1920
Testing & Repair
B-3
Models:
Serial Numbers:
AA205900
Checking for Leaks
Checking For Leaks
Check
All
Soapy
Water
Step 1: Check for Leaks...
• Run PowerMax until gauge reaches 20 "Hg.
• Close the receiver tank inlet valve.
• Do not use any vacuum for several minutes.
Note: If the vacuum gauge continues to drop while
the inlet valve is closed, the leak is within the unit.
If the vacuum gauge maintains the same reading,
but drops after opening the inlet valve, leak is in the piping system.
Avoid water contact with electrical parts.
Step 2: If gauge shows there is a leak, use soapy
water to check for plumbing joint leaks.
Caution
Gauge
Valve in Closed
Position
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© Midmark Corporation 2007 SF-1920
Testing & Repair
B-4
Models:
Serial Numbers:
Vacuum Switch
All
Vacuum Switch
Function and Location
Refer To: Page
Adjustment (Check SN on Page)...B-5 & B-6
Testing (Check SN on Page) ........B-7 & B-8
Wire Diagrams ...................................... D-1
Exploded Views .................................... E-1
The vacuum switch regulates the vacuum level.
A vacuum gauge monitors the vacuum levels.
Vacuum switch is factory set at 13 "Hg.
AA215400
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