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m) Patient Temperature Display Test
To check the patient temperature display, perform the following:
1.
Fill machine with distilled water until green band on float stem is
fully visible.
2.
Connect a resistance of 1355 ohms to the patient probe jack, to
simulate a 98.6°F (37°C) patient temperature.
3.
Turn machine on and set it in the
MANUAL
mode.
4.
PATIENT
Temperature Display should indicate 98.6°F (37°C)
± 0.5°F (0.3°C). Record appropriate value on
INSPECTION FORM.
5.
Connect a resistance of 1667 ohms to the patient probe jack to
simulate an 89.6°F (32°C) patient temperature.
6.
PATIENT
temperature display should indicate 89.6°F (32°C)
± 0.5°F (0.3°C). Record appropriate value on
INSPECTION FORM.
NOTE: The
CHECK PATIENT PROBE
alarm may flash on
during step 6 if the display indicates less than 89.6°F
(32.0°C). This condition is considered normal and
allowable.
n) Low Temperature Backup Thermostat (S1) (Optional)
The low temperature backup thermostat is a fixed trip point
thermostat to limit low temperatures between 26.6°F (-3.0°C) and
36.5°F (+2.5°C).
It is not necessary to test the trip point as part of this
functional test. The function of the thermostat is to protect
the machinery from freezing. It is not a patient safety-related
device.
If there is reason to test this thermostat, perform the following:
1.
Drain machine of water as follows:
a.
Connect a DBK9 connector hose to the
SUPPLY
fitting on
machine.
b.
Turn machine on and select
MANUAL
mode. Allow machine to
pump water out until
ADD WATER
light comes on. Turn
machine off and allow unit to gravity drain until empty.
c.
Disconnect DBK9.
2.
Unplug the power cord.
3.
Add eight (8) quarts (7.6 liters) of water and two (2) quarts (1.9
liters) of alcohol to reservoir.
4.
Connect the test setup shown in figure 13, p. 72.
5.
Plug machine in and place it in service mode 2. Refer to section
8.1,
SERVICE MODES
(pp. 34-35) for instructions on how to
access service modes.
NOTE: In service mode 2, the compressor, pump, and cold
solenoid are activated. No temperature measurement
or other control is performed by the machine in this
mode.
7.3 FUNCTIONAL CHECK &
SAFETY INSPECTION
(continued)
FUNCTIONAL CHECK &
SAFETY INSPECTION
30
SERVICE MANUAL
Medi-Therm II
