WR Medical TB4 Service Manual

Soothes and softens hands,
elbows, feet, and more

Service Manual for

• Model TB4 (220-volt), Snap Action Thermo­stat (S.A.S.) Assembly Replacement

Version 1.0, item no. MR81, rev. 2/21/05

Contents

General Operating Instructions ............................................................. 3

Technical Specifications .......................................................................... 3

Service Procedures .................................................................................. 3

Equipment Needed ............................................................................................... 3

Visual Inspection ...................................................................................................4

Checking the Temperature of the Bath ..............................................................4

Removing the Paraffin or Mineral Oil ............................................................... 5

Replacing the Snap Action Thermostat (S.A.S.) Assembly ............................7

Ordering Parts ......................................................................................... 8

List of Figures

™

Schematic/Wiring Diagram of Therabath®Pro

Bottom and Side Views of Inside Therabath®Pro™ Tank ............................... 7

Cross Section of Case Groove and Tank Lip ................................................... 8

................................................................................

Important Safeguards

— READ ALL INSTRUCTIONS BEFORE REPAIRING—

WARNING

• Repairs must be done by a qualified technician only.

• Failure to properly repair this device may cause injury to the user.

• This device must be repaired so that the bath maintains the temperature of the

paraffin between the temperature limits stated within this manual.

• If the unit is repaired by anyone other than WR Medical Electronics Co. personnel,
all warranties are voided.

CAUTION

• Because specialized equipment and techniques are required in order to properly re-

pair this product, we recommend that all units be returned to the factory for repair.

• For repair advice, contact the factory service department at:
WR Medical Electronics Co.
123 North Second Street, Stillwater, MN 55082 USA
Phone: [phone]
FAX: [phone]
E-mail: [e-mail]
Web Site: www.wrmed.com

• Read all of these instructions before attempting to begin repairs.

• The specifications in this manual are subject to change without notice.

6

Page 2 • Therabath®PRO® Model TB4 (220-volt) Service Manual

— Save These Instructions —

General Operating Instructions

• Therabath®Pro™ paraffin baths are designed for a wide variety of medical and cosmetic
applications. They are normally used in hospitals, clinics, sports facilities, nursing homes,
beauty salons, spas, and in the home.

• Users dip their hands, elbows, or feet into the bath to form a layer of paraffin on their skin.
The paraffin provides a long-lasting heat treatment for the appropriate area. After the par­affin cools, the user removes the solidified paraffin and discards it.

• For more specific user instructions including indications and contraindications, see the

Therabath

®

Pro™ Operator’s Manual, which is included with every new unit.

Technical Specifications

• Unit Capacity ................................................ 2.72 kg of paraffin wax

• Average Operating Temperature ............... 52.2–56.7 degrees C

• Absolute Operating Temperature.............. 51.1–59.4 degrees C

• Paraffin Wax Melt Time............................... 8–10 hours

• Energy Usage ................................................ 0.5 kwh per 24 hours

• Ambient Operating Air Temperature ....... 18.33–29.4 degrees C

• Control Thermostat...................................... Bimetallic Snap Action

• High Limit (Safety) Thermostat................. Bimetallic Snap Action (manual reset)

Service Procedures

Equipment Needed

In order to service a Therabath®Pro™ paraffin bath, you will need the following items:

• 3/8” nut driver;

• Flat blade screwdriver with blade width of 4.0–5.5 mm and a shaft length of 10 cm.;

• A pair of pliers;

• Thermometer: We recommend a thermometer with temperature scale range of 32–82
degrees C., divisions every 0.1 degree C., and with an immersion depth of 79 mm.,
suitable for measuring paraffin wax melt points. Thermometers that meet the ASTM
14C standard are ideal;

• Four liters of mineral oil for testing the Therabath
paraffin);

• Snap Action Thermostat (S.A.S.) Assembly [Part Number 840-wo-34020]: Includes
Control Snap Action Thermostat (S.A.S.), High Limit S.A.S., 0.090 Aluminum Plate,

0.150 CPVC spacer under High Limit S.A.S., 0.125 CPVC spacer under Control S.A.S.,
four 4-40 x 3/8” nylon screws, four 4-40 nylon nuts, and one Thermopaper for under
the S.A.S. assembly.

Therabath®PRO® Model TB4 (220-volt) Service Manual • Page 3

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Pro™ (if not testing with Theraffin

®