Daikin EWAD TZ Installation, Operation And Maintenance Manual Download

Page: 13 / 20

D-EIMAC00907-16EN - 13/20

Electrical Installation

General specifications

All electrical connections to the  unit must be carried out
in compliance with laws and regulations in force.
All  installation,  management  and  maintenance  activities
must be carried out by qualified personnel.
Refer to the specific wiring diagram for the unit you have
bougth. Should the  wiring  diagram  not  be  on the  unit  or
should  it  have  been  lost,  please  contact  your
manufacturer representative, who will send you a copy.

In  case  of  discrepance  between  wiring  diagram  and
electrical  panel/cables,  please  contact  the  manufacturer
representative.

Only use copper conductors. Failure to use copper conductors
could  result  in  overheating  or  corrosion  at  connection  points
and could damage the unit.
To  avoid  interference,  all  control  wires  must  be  connected
separately  from  the  power  cables.  Use  different  electrical
passage ducts for this purpose.
Particular care must be taken when realizing wire connections
to  the  switchbox;  if  not  properly  sealed,  cable  entries  may
allow  ingress  of  water  into  the  switchbox  which  may  cause
damage to the equipment inside.

Before  any  installation  and  connection  works,  the  unit
must  be  switched  off  and  secured.  Since  this  unit
includes  inverters,  the  intermediate  circuit  of  the
capacitors remains charged with high voltage for a short
period of time after being switched off. Do not operate to
the  unit  before  5  minutes  after  the  unit  has  been
switched off.

This  unit  includes  non-linear  loads  such  as  inverters,  which
have  a  natural  current  leakage  to  earth.  If  an  Earth  Leakage
Detector is installed upstream the unit, a type B device with a
minimum threshold of 300 mA must be used.
This  product  complies  with  EMC  standards  for  industrial
environments. Therefore it is not intended for use in residential
areas,  e.g.  installations  where  the  product  is  connected  to  a
low    voltage  public  distribution  system.  Should  this  product
need  to  be  connected  to  a  low  voltage  public  distribution
system,  specific  additional  measures  will  have  to  be  taken  to
avoid interference with other sensitive equipment.

Operation

Operator’s responsibilities

It is essential that the operator is appropriately trained and
becomes familiar with the system before operating the unit. In

addition  to  reading  this  manual,  the  operator  must  study  the
microprocessor  operating  manual  and  the  wiring  diagram  in
order  to  understand  start-up  sequence,  operation,  shutdown
sequence and operation of all the safety devices.
During the unit

’s initial start-up phase, a technician authorized

by the manufacturer is available to answer any questions and
to give instructions as to the correct operating procedures.
The operator must keep a record of operating data for every
installed unit. Another record should also be kept of all the
periodical maintenance and servicing activities.
If the operator notes abnormal or unusual operating conditions,
he is advised to consult the technical service authorized by the
manufacturer.

Maintenance

Routine maintenance
This chiller must be maintained by qualified technicians.
Before beginning any work on the system the personnel
shall assure that all security precautions have been taken.

Neglecting  unit  maintenance  in  these  environments,  could
degrade  all  parts  of  the  units  (coils,  compressors,  frames,
pipes,  etc..)  with  negative  effect  on  performances  and
functionality.
There  are  two  different  levels  of  maintenance,  which  can  be
chosen according to the type of application (critical/non critical)
or to the installation environment (highly aggressive).
Examples  of  critical  applications  are  process  cooling,  data
centres, etc.

Highly Aggressive Environments can be defined as the follows:



Industrial environment (with possible concentration
of fumes result of combustion and chemical process)



Costal environment;



Highly polluted urban environment;



Rural environment close to of animal excrement and
fertilizers, and high concentration of exhaust gas
from diesel generators.



Desert areas with risk of sandstorms;



Combinations of the above

Table 2 lists all Maintenance activities for standard applications
and standard environment.
Table  3  lists  all  Maintenance  activities  for  critical  applications
or highly aggressive environment.
Following  below  instructions  is  mandatory  for  cases  listed
above,  but  also  advised  for  units  installed  in  standard
environments.

Table 2

– Standard Routine Maintenance Plan

List of Activities

Weekly

Monthly

(Note 1)

Yearly/Seas
Onal

(Note 2)

General:

Reading of operating data (Note 3)

Visual inspection of unit for any damage and/or loosening

Verification of thermal insulation integrity