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h) Cold Water Reservoir Controller
To check the cold water reservoir controller, perform the following:
1.
Fill machine with distilled water until green band on float stem is
fully visible.
2.
Connect the test setup shown in figure 13, p. 72.
NOTE: To minimize the test time for this test only, do not
connect a blanket as shown in figure 13. Connect the return
line of connector hose to the TPT9 tester.
3.
Turn machine on and push the
MANUAL
mode button.
4.
Set the Temperature Setpoint to 39.2°F (4°C).
5.
Verify that the machine can supply water anywhere within the
37.4°F (3°C) to 42.8°F (6°C) range as measured by the
thermometer and that the compressor turns off one time. (This will
take 15-30 minutes, depending upon room temperature and other
conditions. The use of a blanket for this test can extend this time up
to 60 minutes.)
i) Blanket Water Temperature Controller and Display Test
To check the temperature controller, perform the following:
1.
Fill machine with distilled water until green band on float stem is
fully visible.
2.
Connect the test setup shown in figure 13, p. 72.
3.
Turn machine on. Set in
MANUAL
mode.
4.
Set the Temperature Setpoint to the various settings specified on the
INSPECTION FORM
(section 7.4, p. 33), wait until the
IN-TEMP
LED
comes on and the water temperature stabilizes, then record the
temperature of the mercury thermometer and that shown on the
display. Verify that the recorded values are within limits outlined on
INSPECTION FORM
, item i.
j) Automatic Mode, Blanket Water Limit Check
To check the blanket water limit in
AUTO
mode, perform the
following:
1.
Fill machine with distilled water until green band on float stem is
fully visible.
2.
Connect the test setup as shown in figure 13 (p. 72).
3.
Connect a resistance of 1355 ohms to the patient probe jack to
simulate a 37°C patient temperature.
4.
Turn machine on and place in
AUTO
mode with setpoint of 40°C.
5.
Verify that the mercury thermometer does not exceed 42°C.
7.3
FUNCTIONAL CHECK &
SAFETY INSPECTION
(continued)
FUNCTIONAL CHECK &
SAFETY INSPECTION
23
SERVICE MANUAL
Medi-Therm II
