7 System Operation and Maintenance
Periodic system maintenance is crucial to ensure product reliability and validity. This chapter describes the
operation and maintenance of the precision air conditioner, including routine maintenance, system
diagnostic testing, and maintenance of filters, fan components, refrigeration systems and drainage
systems.
7.1 Safety Instructions
WARNING! During the operation of the precision air conditioner, very high voltage may be
present in the equipment. Adhere to all of the notes and warnings marked on the equipment or
contained in this manual, which may otherwise lead to an injury or fatality.
WARNING! Only qualified maintenance personnel can operate and handle the equipment. All
maintenance and operation must follow the local laws, especially the regulations about the
electric power, refrigeration, and production.
WARNING! Risk of contact with high-speed rotating fan blades. Can cause serious injury or
death. Open all local and remote electric power-supply disconnect switches, verify with a
voltmeter that power is off, and verify that all fan blades have stopped rotating before working
in the unit cabinet or on the fan assembly.
WARNING! Risk of hair, clothing and jewelry entanglement with high speed rotating fan blades.
Can cause equipment damage, serious injury or death. Keep hair, jewelry and loose clothing
secured and away from rotating fan blades during unit operation.
WARNING! Risk of contact with extremely hot and/or cold surfaces. Can cause injury. Verify that
all components have reached a temperature that is safe for human contact or wear appropriate,
OSHA-approved PPE before working within the electric connection enclosures or unit cabinet.
Perform maintenance only when the system is de-energized and component temperatures have
become safe for human contact.
WARNING! Risk of improper wiring, piping, moving, lifting and handling. Can cause equipment
damage, serious injury or death. Installation and service of this equipment should be done only
by qualified personnel who have been specially-trained in the installation of air-conditioning
equipment and who are wearing appropriate, OSHA-approved PPE.
CAUTION: Comply with the manufacturer’s instructions before and during maintenance. Failure
to observe this will result in the warranty becoming void. Adherence to the safety instructions is
mandatory to ensure personnel safety and prevent any environmental impact apart from
equipment damage. Unsuitable components will impede equipment performance and may
cause equipment shutdown. Therefore, Vertiv recommends the use of Vertiv OEM or
Vertiv-approved components.
CAUTION: Switch off the VRC1 unit and then switch off the power input during equipment
maintenance. Switch off the equipment power unless the testing devices need power.
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