10
Section 7 - Functional Check and Safety Inspection (cont’d)
Figure 6 - Temperature sensor location
4. Set the two TC20 Test Tool toggle switches as
follows:
•
THERMOSTAT BYPASS
-- place in center
position;
•
HEAT/OVERTEMP
-- place in
HEAT
position.
5. Locate the air temperature sensor at the center
of the end of the hose (fig. 6A). Secure the
sensor with adhesive tape.
Verify that the
sensor is located at the center of the hose.
6. Connect the hose to a Model TC1050, TC2050,
TC2052, or TC2054 Quilt (fig. 6B).
7. Turn the Power Unit on. Select the
46°C
setting.
8. Run the Power Unit for 5 to 10 minutes at the
46°C
setting. The temperature will oscillate.
During this time interval, familiarize yourself
with the following steps 9 through 14. Have a
stopwatch ready.
9. Place the
HEAT/OVERTEMP
switch to
OVERTEMP.
The temperature should start to
increase. When the air temperature reaches
48°C, start the stopwatch.
10. Allow the Power Unit to heat until either the S2
or S3 Test Tool thermostat indicator is lit. Stop
the stopwatch and note the highest temperature
displayed. This is the upper limit temperature for
one of the thermostats. Record the time and
temperature on the
INSPECTION FORM
.
Verify that the
REMOVE FROM USE
light is lit.
NOTE: It is acceptable if both thermostats trip
simultaneously, in which case the S2 and S3
indicators will both be off. If this occurs,
record the elapsed time and temperature.
Verify that the REMOVE FROM USE indicator is
lit. Verify that both the S2 and S3 indicators
light by toggling the THERMOSTAT BYPASS
switch from the S2 to S3 position. (If both
thermostats have tripped, skip steps 11-14
and proceed to step 15.)
11. Switch the TC20
THERMOSTAT BYPASS
to
whichever thermostat (
S2
or
S3
) is lit. This will
short out the thermostat which opened first so
that the second thermostat can be tested.
Switch the TC20 from
OVERTEMP
to
HEAT
to
allow the Power Unit to return to normal
operating temperature before testing the
second thermostat.
12. Run the Power Unit again for 5 to 10 minutes
in the
46°C
setting. The temperature will
oscillate. Have a stopwatch ready.
13. Place the
OVERTEMP/HEAT
switch to
OVERTEMP
. The temperature should start to
increase. When the air temperature reaches
48°C, start the stopwatch.
14. Continue to monitor the TC20 Test Tool until the
second thermostat indicator is lit. Stop the
stopwatch and note the highest temperature
displayed. This is the upper limit temperature for
the other thermostat. Record the time and
temperature on the
INSPECTION FORM
Figure 6A - Hose detail, showing sensor location
Figure 6B - Test setup
