Operating Instructions and Installation Instructions

EUWA(*)5~24KBZW1
Packaged air-cooled water chillers
4PW61653-1 – 07.2010
Installation and operation manual
18
Variables database
The BMS or supervisory system and the chiller unit communicate
through a fixed set of variables, also called address numbers.
Hereafter, you will find the information you need about the digital,
integer and analogue variables that the BMS or supervisory system
can read from or write to the address card of the chiller.
For addresses of all the direct and user parameters refer to
"Overview of the direct and user parameters" on page 14.
Overview of all variables which are not direct or user
parameters
TROUBLESHOOTING
This section provides useful information for diagnosing and
correcting certain troubles which may occur in the unit.
Before starting the trouble shooting procedure, carry out a thorough
visual inspection of the unit and look for obvious defects such as
loose connections or defective wiring.
Before contacting your local Daikin dealer, read this chapter carefully,
it will save you time and money.
When a safety device was activated, stop the unit and find out why
the safety device was activated before resetting it. Under no
circumstances safety devices may be bridged or changed to a value
other than the factory setting. If the cause of the problem cannot be
found, call your local Daikin dealer.
Symptom 1: The unit does not start, but the
L LED lights up
Symptom 2: The unit does not start, but the
L LED is flashing
Symptom 3: The unit does not start and the L LED does not light up
Description
Modbus
address
Parameter
type
(*)
(*) D=digital.
Circuit alarm
1=A1, HP1, or LP1
alarm codes active
0=no alarm code active
Read
only
41 D
General alarm
1=FL alarm code
0=no alarm code active
Read
only
45 D
NTC Probe alarm
1=E1, E2, or E3 alarm
codes
0=no alarm code active
Read
only
46 D
Input of flowswitch
alarm
1=closed
0=open
Read
only
53 D
Input of
changeable digital
S7S input
1=closed
0=open
Read
only
54 D
Input of high
pressure or
discharge protector
or overcurrent
alarm
1=closed
0=open
Read
only
55 D
Input of low
pressure switch
alarm
1=closed
0=open
Read
only
56 D
Input of
changeable digital
S9S input
1=closed
0=open
Read
only
57 D
Output of
compressor 1
1=on
0=off
Read
only
59 D
Output of
compressor 2
1=on
0=off
Read
only
60 D
Output of pump
1=on
0=off
Read
only
61 D
Output of reversing
valve
1=on
0=off
Read
only
62 D
Output of alarm
1=on
0=off
Read
only
63 D
On or off
1=on
0=off
Read/
write
64 D
When carrying out an inspection on the switch box of the
unit, always make sure that the main switch of the unit is
switched off.
POSSIBLE CAUSES CORRECTIVE ACTION
The temperature setting is not
correct.
Check the controller setpoint.
Power supply failure. Check the voltage on the supply
panel.
Blown fuse or interrupted protection
device.
Inspect fuses and protection
devices. Replace by fuses of the
same size and type (refer to chapter
"Electrical specifications" on
page 4).
Loose connections. Inspect connections of the field
wiring and the internal wiring of the
unit. Tighten all loose connections.
Shorted or broken wires. Test circuits using a tester and repair
if necessary.
POSSIBLE CAUSES CORRECTIVE ACTION
The remote ON/OFF input is
enabled and the remote switch is off.
Put the remote switch on or disable
the remote ON/OFF input.
The anti-recycling timer is still active. The cicuit can only start up after
approximately 4 minutes.
The guard timer is still active. The circuit can only start up after
approximately 1 minute.
POSSIBLE CAUSES CORRECTIVE ACTION
One of the following safety devices is
activated:
•Reverse phase protector
•Overcurrent relay (K*S)
• Discharge thermal protector (Q*D)
•Evaporating temperature
• Thermostat (S*T)
• Flow switch (S10L)
• High pressure switch (S*HP)
Check on the controller and refer to
symptom 4 "One of the following
safety devices is activated" on
page 19. Refer to the explanation of
the digital controller in the chapter
"Resetting alarms" on page 13.
The unit is in anti-freeze alarm. Check on the controller and refer to
symptom 4 "One of the following
safety devices is activated" on
page 19. Refer to the explanation of
the digital controller in the chapter
"Resetting alarms" on page 13.
The remote ON/OFF input is
enabled and the remote switch is off.
Put the remote switch on or disable
the remote ON/OFF input.
The keyboard is locked. The user
parameter h09 is set to 0.
Unlock the controller keyboard.
4PW61653-1_digital_EN.book Page 18 Thursday, August 26, 2010 1:49 PM