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Chapter 2: Installation, Maintenance, and Checkout
Installation and Service Checkout Procedures
9.
If either the scale or oximetry option is installed, push the "About" key on the main help menu and check
to ensure that their current software revision appears.
10.
Check the Observation Lights function and Procedure light function (if equipped).
11.
Check the power failure alarm and the battery-backed-up memory. Make note of the current control
mode and temperature settings and wait one minute, then unplug the warmer from the wall outlet. An
alarm should sound and the power failure indicator should light. Wait one to two minutes and plug the
warmer back in. Verify that the alarm cancels and that the warmer returns to the same control mode
and temperature settings it displayed before the power interruption.
Note:
A fully charged battery should supply the power failure alarm for 10 minutes minimum
(IEC 60601-2-19 clause 101.3). If the alarm is tested for the full 10 minutes, the warmer must be run
at least two hours to recharge the battery before it is used with a patient. Total recharge time is
10 hours. The battery charges only when the unit is powered on.
2.2.3 Electrical Safety Tests
Use an approved electrical safety analyzer to test the unit's ground continuity and leakage current.
For reliable leakage current readings the ground resistance check should be performed first. Follow the
operating instructions supplied by the manufacturer of the electrical safety analyzer to verify the following:
2.2.3.1 Ground Resistance Check
1.
Measure the resistance between the ground pin on the line cord plug and exposed metal of the
electronic enclosure. The ground resistance must be less than 0.2 Ohms.
2.
Measure the resistance between the ground pin on the line cord plug and ground pin on the appliance
outlet connectors. The ground resistance must be less than 0.1 Ohms.
Note:
Not all metal components are safety ground bonded. Only the heater reflector, heater duct, power
supply mounting bracket(s), electrical enclosure and elevating base are required to be safety ground
bonded. When servicing involves disturbing the ground bonds of these components the ground
integrity should be verified.
2.2.3.2 Earth Leakage and Chassis Leakage Current
Note:
Wait 30 seconds after powering on before taking readings.
For 115 VAC rated devices:
1.
In normal condition and in all possible operating modes the leakage current shall be less than 180
microamperes.
2.
If required by local ordinances, in single fault condition and in all possible operating modes the leakage
current shall be less than 200 microamperes.
For 220-230-240 VAC rated devices:
1.
In normal condition and in all possible operating modes the leakage current shall be less than 360
microamperes.
2.
If required by local ordinances, in single fault condition and in all possible operating modes the leakage
current shall be less than 500 microamperes.
2-4
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