EC-fan Low-voltage Tests
•
Check control input at the control-system connection (E1 and GND). Confirm that
there is a control voltage present at the connection.
NOTE: Use the GND in the connector. Do not connect the control ground to the PE in Main connector!
•
Check +10 V output on control-system connection (b10 V and GND).
EC-fan Alarm Contact Tests
Check the alarm contact at the alarm-relay connection to determine if there are any fault conditions
present.
Condition
No Fault Condition
Fault Condition
NC - COM
Closed
Open
NOTE: The table refers to conditions while the motor is actively energized. When the motor is de-
energized, it will be in a fault condition.
•
Check EC Control to determine the fault condition.
9.3 Direct-drive Blower System
Monthly inspection of the blower package includes: motor mounts, fan bearings, and impellers.
9.3.1 Fan Impellers and Motor Bearings Maintenance
Fan impellers should be periodically inspected and any debris removed. Check to see if they are tightly-
mounted on the fan shaft. Rotate the impellers and make sure they do not rub against the fan housing.
Although the motor bearings are permanently-sealed and self-lubricating, inspect the bearings monthly
for signs of wear.
9.4 Steam-generating Humidifier Maintenance
The humidifier drains and refills to maintain a current setpoint and alert the operator when the humidifier
canister needs to be replaced.
WARNING! Arc flash and electric shock hazard. Open all local and remote electric power-supply
disconnect switches, verify with a voltmeter that power is Off and wear appropriate,
OSHA-approved personal protective equipment (PPE) per NFPA 70E before working within the
electric control enclosure. Failure to comply can cause serious injury or death. Customer must
provide earth ground to unit, per NEC, CEC and local codes, as applicable. Before proceeding
with installation, read all instructions, verify that all the parts are included and check the
nameplate to be sure the voltage matches available utility power. The Liebert® controller does
not isolate power from the unit, even in the “Unit Off” mode. Some internal components require
and receive power even during the “Unit Off” mode of the controller. The only way to ensure
that there is NO voltage inside the unit is to install and open a remote disconnect switch. Refer
to unit electrical schematic. Follow all local codes.
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.
9 Maintenance
41
Содержание Liebert Mini-Mate MT036
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