Section 7 - Functional Check and Safety Inspection (cont’d)
7.3 Power Switch
Check the power switch light:
1. Plug in the Power Unit. Turn the power switch
on.
2. Verify that the power switch is lit.
3. Verify the Power Unit starts in the
32°C
heat
setting.
7.4 Temperature Settings Switches
Examine the overall condition of the control panel:
1. Select each of the five temperature settings.
Verify that the appropriate indicator for each
lights.
7.5 Thermostat and
REMOVE FROM
USE
Alert
Test the Patient Limit Thermostats and
REMOVE
FROM USE
Alert.
The following procedure describes two different
approaches for measuring the trip points
(actuation temperatures) of the Power Unit's
patient limit thermostats. There are two patient
limit thermostats (item 17, fig. 11, p. 26) within
the Power Unit and each must be tested. The
TC20 Test Tool helps simplify these tests. Steps
1 to 20 (pp. 9-11) should be followed when a
TC20 Test Tool is available. For those facilities not
having access to a TC20, follow steps 21 to 50
(pp. 12-13).
NOTE: A third thermostat, the heater overtemp
thermostat (item 25, fig. 11, p. 26), is provided
to protect internal components in the event of a
motor blockage or failure. It does not need to
be function tested.
7.5.1 TC20 Test Tool Procedure
(steps 1 to 20)
[see fig. 10, p. 25, for
TC20 Test Tool part number]
1. Unplug the Power Unit.
Always unplug the Power Unit
before attaching or removing the
TC20 Test Tool and when resetting
thermostats. Failure to unplug the
Power Unit could result in
electrical shock and cause death
or serious injury.
2. Remove the six screws on the back of the
unit. Carefully separate the two halves of the
enclosure.
3. Connect the TC20 Test Tool (fig. 5) to the
5-pin field test connector on back of the PC
board and route the TC20 Test Tool cable out
through the opening in the bottom of the unit
(see fig. 10, p. 25). Close the two halves of the
enclosure and temporarily secure it closed
with adhesive (duct) tape. Plug in the power
unit.
9
Figure 5 - TC20 Test Tool
(for schematic, see figure 12, p. 27)
HEAT
S3
S2
OVERTEMP
THERMOSTAT
BYPASS
WARNING
