iii
Caution Statements
The following equipment cautions appear in the text whenever the equipment is
in danger of damage and are repeated here for emphasis.
On pages 9.
On pages 12.
On pages 9 and 12.
On pages 1, 3, 12, 16, 17, and 19.
On pages 3.
On page 4.
On page 5.
CAUTION
The Bird 4421 contains no user-serviceable parts. Do not remove its cover.
CAUTION
The Bird 4421 must be powered off when connecting or disconnecting the power
sensor from the power meter.
CAUTION
Due to the complexity of the Bird Power Sensor, field repairs beyond general
maintenance should not be attempted. Removal or disturbance of the power
sensor cover can result in cancellation of lifetime warranty.
CAUTION
Changing the sensor’s connectors will invalidate calibration data, and may
reduce the maximum power rating of the unit.
CAUTION
Check the local electrical code for proper AC hookup prior to operation of the
unit. Make sure the neutral or return hookup is only used for that purpose.
CAUTION
Use the Bird Cal Cart in a dry, dust and vibration free environment. Do not use
outdoors or in areas of condensing humidity. Allow at least 12" (30 cm) of
clearance around the load.
CAUTION
Maximum power dissipation is severely reduced when the blower is not running.
If the indicator light should turn off, immediately reduce RF power by 75%.
