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Daikin EWLP026KBW1N [5/20] Function of the main components
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EWLP012~065KBW1N
Condenserless water-cooled water chillers
4PW61666-1A – 2012.04
Operation manual
4
Function of the main components
Figure: Functional diagram
As the refrigerant circulates through the unit, changes in its state or
condition occur. These changes are caused by the following main
components:
■ Compressor
The compressor (M*C) acts as a pump and circulates the
refrigerant in the refrigeration circuit. It compresses the
refrigerant vapour coming from the evaporator to a pressure at
which it can easily be liquified in the condenser.
■ Filter
The filter installed behind the condenser removes small particles
from the refrigerant to prevent blockage of the tubes.
■ Expansion valve
The liquid refrigerant coming from the condenser enters the
evaporator via an expansion valve. The expansion valve brings
the liquid refrigerant to a pressure at which it can easily be
evaporated in the evaporator.
■ Evaporator
The main function of the evaporator is to take heat from the
water that flows through it. This is done by turning the liquid
refrigerant, coming from the condenser, into gaseous refrigerant.
■ Water in/outlet connections
The water inlet and outlet connection allow an easy connection
of the unit to the water circuit of the air handling unit or industrial
equipment.
Safety devices
The unit is equipped with General safety devices: shut down all
circuits and stop the whole unit.
■ I/O PCB (A2P) (input/output)
The I/O PCB (A2P) contains a reverse phase protector.
The reverse phase protector detects if the 3 phases of the power
supply are connected correctly. If a phase is not connected or if
2 phases are inverted, the unit can not start up.
■ Overcurrent relay
The overcurrent relay (K*S) is located in the switch box of the
unit and protects the compressor motor in case of overload,
phase failure or too low voltage. The relay is factory-set and may
not be adjusted. When activated, the overcurrent relay has to be
reset in the switch box and the controller needs to be reset
manually.
■ High-pressure switch
The high-pressure switch (S*HP) is installed on the discharge
pipe of the unit and measures the condenser pressure (pressure
at the outlet of the compressor). When the pressure is too high,
the pressure switch is activated and the circuit stops.
When activated, it resets automatically, but the controller needs
to be reset manually.
1 Compressor 9 Liquid stop valve
2 Filter 10 Discharge stop valve
3 Expansion valve 11 Accumulator
4 Evaporator 12 Flow switch (delivered with the unit, installed in the field)
5 Evaporator water outlet 13 Ball valve (delivered with the unit, installed in the field)
6 Evaporator water inlet 14 Water filter (delivered with the unit, installed in the field)
7 Sight glass 15 Air purge valve (delivered with the unit, installed in the field)
8 Liquid solenoid valve Field piping
S4LP
S1HP
R3T
Q1D
HP
LP
M1C
R4T
1
5
64
2
10111513
13
14
3 7
S5LP
S2HP
Q2D
HP
LP
M2C
12
R3T
R4T
S4LP
HP
LP
M1C
S1HP
Q1D
8 9
EWLP012~030KBW1N
EWLP040~065KBW1N
Содержание
- Condenserless water cooled water chillers 1
- Operation manual 1
- Introduction 2
- Ntroduction 2
- Operation manual 2
- Electrical specifications 3
- Electrical specification 3
- Technical specifications 3
- Technical specification 3
- 14 15 16 4
- Description 4
- Escription 4
- Figure main components 4
- The ewlp condenserless water cooled water chillers are available in 7 standard sizes 4
- Function of the main components 5
- Safety devices 5
- Internal wiring parts table 6
- Before operation 7
- Checks before initial start up 7
- Digital controller 7
- Efore operation 7
- General recommendations 7
- Operation 7
- Peration 7
- Power supply connection and crankcase heating 7
- User interface 7
- Water supply 7
- Adjusting the cooling temperature setpoint on page 8 8
- Consulting actual operational information on page 9 8
- Direct and user parameters 8
- Each parameter is defined by a code and a value for example the parameter used to select local or remote on off control has code h07 and value 1 or 0 8
- Example the leds f and g are displayed when accessing a parameter group or when accessing parameters directly 8
- For an overview of the parameters refer to overview of the direct and user parameters on page 10 8
- Function during main display not inside menu 8
- Keys provided on the controller 8
- Leds provided on the controller and remote interface 8
- Legibility of the numeric display may decrease in direct sunlight 8
- Resetting alarms on page 9 8
- Resetting warnings on page 9 8
- Switching the unit on on page 8 and switching the unit off on page 8 8
- Temperature readout tolerance 1 c 8
- The digital controller provides direct and user parameters the direct parameters are important for the everyday usage of the unit e g to adjust the temperature setpoint or to consult actual operational information the user parameters on the contrary provide advanced features such as adjusting time delays 8
- The function carried out when the user presses one or a combination of these keys depends on the status of the controller and the unit at that specific moment 8
- This chapter deals with the everyday usage of the ewlp units here you will learn how to perform routine tasks such as 8
- When selecting a parameter group or parameter different leds related to the parameter group or parameter are displayed 8
- Working with the units 8
- Adjusting the cooling temperature setpoint 9
- How to consult and modify the direct parameters 9
- How to consult the sensor readout menu parameters 9
- Switching the unit off 9
- Switching the unit on 9
- Consulting actual operational information 10
- Resetting alarms 10
- Resetting warnings 10
- Advanced features of the digital controller 11
- Overview of the direct and user parameters 11
- The list of direct parameters is accessible by pressing the b key for approximately 5 seconds refer also to how to consult and modify the direct parameters on page 8 11
- This chapter gives an overview of the direct parameters and user parameters provided by the controller in the following chapter you will learn how you can set up and configure the unit using these parameters 11
- Defining the cooling temperature differential 12
- Defining the heating temperature differential 12
- How to consult and modify the user parameters 12
- Defining the measurement unit 13
- Defining the time delay between pump and compressor startup 13
- Defining the time delay between unit and pump shutdown 13
- Defining the timer threshold for maintenance warning 13
- Selecting dual setpoint control 13
- Selecting local or remote cool heat control 13
- Selecting local or remote on off control 13
- Bms connection modbus 14
- Connection modbus 14
- Different parts of the communication network 14
- General description of modbus 14
- General information about the modbus protocol 14
- Implemented commands for the modbus protocol 14
- Implemented rs485 communication settings for the modbus protocol 14
- Locking the controller keyboard 14
- 0 for off 15
- 1 for on 15
- Activating the modbus protocol 15
- All digital variables are assigned to bits of consecutive registers each one having 15
- Analogue and integer data an analogue and integer value is represented by a 16 bit word register in binary notation for each register the first byte contains the high order bits and the second byte contains the low order bits 15
- Data representation of the modbus protocol 15
- Defining the bms setting 15
- Defining the bms setting 15
- Defining the unit s serial address 15
- Digital all digital data is coded by a single bit 15
- For addresses of all the direct and user parameters refer to overview of the direct and user parameters on page 10 15
- Implemented error code 15
- In case the bms or supervisory system tries to write a value of a parameter that is out of range the writing will be ignored 15
- Overview of all variables which are not direct or user parameters 15
- The address card operates on registers where one register must be considered at 16 bit 15
- The analogue variables are represented in tenths for example the value 10 is transmitted as 0064h 100d for example the value 10 is transmitted as ff9ch 100d 15
- 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 15
- The higher address variable assigned to the most significant bit 15
- The integer variables are transferred using the effective value for example the value 100 is transmitted as 0064h 100d 15
- The lower address variable assigned to the less significant bit 15
- The modbus protocol is activated by setting the h23 parameter to 1 15
- This is a user parameter refer to how to consult and modify the user parameters on page 11 15
- To define each unit s unique serial address required for communication with the supervisionary system set parameter h10 15
- Variables database 15
- Before contacting your local dealer read this chapter carefully it will save you time and money 16
- 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 16
- Roubleshooting 16
- This section provides useful information for diagnosing and correcting certain troubles which may occur in the unit 16
- Troubleshooting 16
- When a safety device was activated stop the unit and find out why the safety device was activated before resetting it under no circum stances 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 dealer 16
- When carrying out an inspection on the supply panel or on the switch box of the unit always make sure that the circuit breaker of the unit is switched off 16
- Aintenance 17
- Disposal requirements 17
- Important information regarding the refrigerant used 17
- Maintenance 17
- Maintenance activities 17
- Annex i 18
- Saturated temperature 18
- Menu overview 19
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