Diagnosis and Maintenance50
6 Diagnosis and Maintenance
This chapter describes the system operation and maintenance of the AHU series air conditioner briefly in accordance with
the end-user perspective. It includes information related to routine maintenance and inspection, electrical connections
inspection, wiring, system diagnosis, visual appearance checks, and drainage maintenance among others; that helps in
system fault diagnosis and treatment.
For the diagnosis and treatment of complex fault please contact Vertiv local representative.
Prior to operation and maintenance, the lethal voltage may be present in the equipment which can
be fatal. All notes, warnings, and cautions marked on the equipment as well as the ones mentioned in
the manual must be considered, otherwise, it may lead to injury and fatality.
Note: Qualified and professional maintenance personnel are the one supposed to operate and handle the equipment.
6.1. Fault Diagnosis and Treatment of Fans
Refer Table 6-1 for fan fault diagnosis and treatment.
Table 6-1 Fault Diagnosis and Treatment of Fans
Symptom Potential Causes Item to be Examined or Handled
EC fan cannot be
started
Circuit breaker
disconnection Check the circuit breaker of the main fan.
Contactor cannot
be closed
Check whether there is 24 Vac voltage between P36-3 and P36-8. If yes,
but the contactor still cannot close, then the contactor is damaged.
Replace the contactor.
Control board failure
Check whether there is 24 Vac voltage between P36-3 and P36-8. If yes
not, then the control panel is damaged.
Check whether the green LED beside silicon control Q5 on the control
panel is on or o.
Contactor closed, air
flow switch alarm
Check whether there is 0 Vdc to 10 Vdc analog signals output from P51-
3, if not, then check the control board carefully.
Check whether the values of S152 and S153 are set too low, if it is so,
then fix it by increasing the setting values properly.
Check whether the External Static Pressure (ESP) is too high, if it is
so, then fix it by optimizing the air channel and increasing the setting
values properly.
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