D-EIMWC003H02-18_02EN - 20/34
I.e. the three phases measure 383, 386 and 392 volts respectively, the average is:
383+386+392 = 387 V
3
the percentage of imbalance is thus
(392-387) x 100 = 1,29% less than the maximum admitted (2%)
387
Before any maintenance and/or electrical connection to the compressor inverter, make sure the
system is turned off and the unit main switch open.
After turning off the main switch, wait at least 20 minutes for the inverter condensers to completely
discharge. Do not perform any maintenance and/or electrical connection in this period of time.
2.17 Control circuit
The
unit control circuit is powered at 230 Vac.
The controller ON/OFF switch (Q0) must be rotated to the OFF position whenever machine operations are not required.
Water flow switch interlock terminals are included in the controller. See the wiring diagram for the correct connections on the
field.
The purpose of the water flow switch interlock is to prevent the compressor from running for enough time to let the two
evaporator and condenser water pumps to operate and ensure the correct water flow. The flow switch can be supplied on
request from Daikin Applied Europe and in any case must be compulsorily installed on the machine. For better protection
against freezing, connecting the evaporator flow switch, contactor clean contact or pump circuit breaker in series.
It is best to leave pump control to the microprocessor for better system management.
If an external system independently manages pump start, follow this logic.
Evaporator water inlet
•
turn on the pump 2 minutes before enabling the machine
•
turn off the pump 5 minutes after disabling the machine
Condenser water pumps:
•
turn the pump on 30 seconds before enabling the machine
•
turn the pump off 1 minute after the last compressor is turned off.
With the machine off, the condenser pump must always be turned off.
Testing the control circuit
Each unit is factory tested. Both the control and power circuits undergo a careful functional test before the machine is
shipped.
3
OPERATION
3.1
Operator’s responsibilities
It is important that the operator becomes familiar with the equipment before operating the machine.
In addition to reading this manual, the operator should study the operation manual and the wiring diagram supplied with the
unit to understand commissioning, operation and the shutdown sequence as well as the shutdown mode and safeties.
During initial machine start-up, the Daikin technician is available to answer any questions and instruct on proper
operating procedures
.
The operator should keep an operating data log for each specific machine. Furthermore, an additional maintenance log
should be kept for periodic maintenance and service.
This Daikin unit represents a substantial investment and deserves the attention and care to keep this equipment in good
working order. If the operator observes abnormal or unusual operating conditions, calling Daikin technical service is
recommended.
In any case, it is essential to follow the instructions below during operation and maintenance:
- Do not allow unauthorized and/or unskilled personnel to access the unit.
- It is forbidden to access the electrical components without having opened the unit main switch and switched off the power
supply.
- It is forbidden to access the electrical components without using an insulating platform. Do not access electrical
components if water and/or moisture are present.
- Ensure that all operations on the refrigerant circuit and on components under pressure are exclusively carried out by
qualified personnel.
- Compressors must be replaced and lubricant oil filled by qualified personnel.
- Sharp edges can cause injuries. Avoid direct contact.
- Do not introduce solid objects into the water pipes while the unit is connected to the system.
- A mechanical filter must be fitted to the water pipe connected to the heat exchanger inlet.
- The unit is equipped with high-pressure safety pressure switches on each compressor, which stop it when triggered when
the pressure exceeds the set value. If triggered, reset the pressure switches by pressing the blue button and then the alarm
on the microprocessor.
- It is absolutely forbidden to remove any protection system covering moving parts.
In case of sudden stop of the unit, follow the instructions on the Control Panel Operating Manual which is part of the on-
board documentation delivered to the end user.
