Page 8
•
Therabath
®
PRO
®
Model TB4 (220-volt) Service Manual
•
Check for any loosening of or damage to the heating element pad.
•
Check that all electrical connections are normal (see Figure 1, page 6).
•
Check the condition of all the wires.
If there are any problems, contact the factory for further advice before continuing.
4. Locate the S.A.S. Assembly to be replaced (see Figure 2, page 7). The thermostats are
located on the bottom of the bath. They are mounted on an aluminum plate and CPVC
spacers.
5. Disconnect the wires from the old thermostats. The connections to the thermostats are
push-on connectors. Remove them by grabbing them with a pliers and pulling them
straight off. Do not pull on the wires.
6. Remove the 10-32 nut between the High Limit and Control thermostats. (NOTE: As-
sembly may be stuck to the heating pad. A twisting motion may help loosen assem-
bly.)
7. Discard the old S.A.S. Assembly.
8. Place the new S.A.S. Assembly over the 10-32 stud on the bottom of the tank. The
High Limit thermostat (with manual reset button)
must be
closest to the end of the
heating pad (see Figure 2). Thread on the 10-32 nut and torque to 10 inch-pounds.
9. Attach the short black lead between the thermostats on one side as shown in Figure 1,
page 6.
10. Attach the long black lead to the High Limit thermostat, and attach the joined red and
white/black lead to the Control thermostat as shown in Figure 1.
11. Replace any of the four alignment pins re-
ferred to in step 2.
12. Reassemble the unit so the insulation is not
bunched up, and the lip of the tank is prop-
erly seated in the groove on the case halves
all the way around (see Figure 3). The wires
inside the case must not be pinched be-
tween the case halves.
13. Re-thread the four screws removed in step
1. It may be useful to put the unit on its
side, thread the screw from the top and
hold the nut from the bottom with a pencil
or other object which fits into the recessed
hole in the case. Tighten the screws until
snug. Do not overtighten the screws.
14. Test the unit for proper operation before using (see “Checking the Temperature of the
Bath,” page 4).
Ordering Parts
To order a Snap Action Thermostat (S.A.S.) Assembly Kit or any other needed part, please
call the factory at
651-430-1200
; fax your order to
651-439-9733;
or e-mail us at
.
IMPORTANT
: Please include the serial number or date of manufacture of the
Therabath
®
PRO
®
paraffin bath, your shipping address, fax number, and e-mail address
(if applicable) with your order.
Figure 3: Cross Section of Case
Groove and Tank Lip
Copyright © 1994-2005 by WR Medical Electronics Co. All rights reserved. Trademarks and registered trademarks of WR Medical Electronics Co.
include (but are not limited to): Therabath,
®
Theraffin,
®
ComforKit,
™
ScentFree,
™
Therabath
®
Pro,
®
and The Paraffin Specialist.
™
Thinsulate is a
registered trademark of 3M Corporation.
