3-COMP CHILLER CONTROLLER
INDEX
A. Introduction
B. Hardware Description
C. Control Actions
D. Control Board – LCD & LED
E. Description of Inputs / Outputs
F. Keypad
G. Regulation of Room Temperature
H Setting the parameters
I. Technical Data
Introduction
The “MEGA CHILL-3Comp” is a three compressor chiller controller . This
integrates all the required functions of the chiller.
It is very user friendly due to the LCD provided which gives all the parameters,
messages, alarms etc on the display. In addition to the LCD there are LED’s
provided for instant status on all controls in the system.
HARDWARE DESCRIPTION
The basic system comprises :
- Control (Display) board
- INPUT/OUTPUT board
WARNING :
HP, LP, Antifreeze faults are by default in manual reset mode. They remain in manual
reset mode until the user resets to normal conditions by pressing the CLEAR button.
These can be changed to auto reset by changing P4 parameter.
CONTROL ACTIONS
- Regulation of Chiller temperature based on the control sensor location.
Control Board :
LIQUID CRYSTAL DISPLAY (LCD)
The Liquid Crystal Display shows the values of the controlled parameters, the selected
set-point, the alarm thresholds and all other information concerning the controlled
variables.
DISPLAY types :
2 rows X 16 characters LCD
LIGHT EMITTING DIODES (LED)
LEDs INDICATING THE STATUS OF THE DEVICES
There are different LED indications on the control board front panel. They give the
following information :
- Red blinking LED “ALERT” : Indicates that there is a fault
- Red LED devices : Indicates that there is a fault in that particular device
- Green LED devices : Indicates that the device is OK
- Blank (inactive) LED indicates that the device is inactive.
DESCRIPTION OF INPUTS / OUTPUTS
ANALOGUE INPUTS
Probes
1. CONTROL : used as the main controlling probe based on which the setpoint will
regulate the system.
2. Condenser Inlet : Senses Condenser Inlet temperature
3. Condenser Outlet: Senses Condenser Outlet temperature.
4. Water Inlet : Senses Water (CHILLER) Inlet temperature
5. Water Outlet : Senses Water (CHILLER) Outlet temperature
6. Antifreeze : Used to trip compressors below AFT set point .
DIGITAL INPUTS
Controller manages the following protections :
- High Pressure trip for the compressor1(HP1)
- Low Pressure Trip for the compressor1.(LP1)
- Compressor Overload trip1(COMP O/L1)
- OSS - Oil Safety Switch (OSS1)
- Single Phase Preventor Trip1(SPP1)
- High Pressure trip for the compressor2(HP2)
- Low Pressure Trip for the compressor2.(LP2)
- Compressor Overload trip2(COMP O/L2)
- OSS - Oil Safety Switch (OSS2)
- Single Phase Preventor Trip2(SPP2)
- High Pressure trip for the compressor3(HP3)
- Low Pressure Trip for the compressor3.(LP3)
- Compressor Overload trip3(COMP O/L3)
- OSS - Oil Safety Switch (OSS3)
- Single Phase Preventor Trip3(SPP3)
- Condenser Fan1 O/L Trip (FAN O/L1 )
- Condenser Fan2 O/L Trip (FAN O/L2 )
- Condenser Fan3 O/L Trip (FAN O/L3 )
- Pump Overload Trip
- Evaporator Water Flow Switch Trip
The controller informs the user of a fault condition via a buzzer and an ALARMRELAY.
DIGITAL OUTPUTS (RELAY)
1. Chiller Pump
2. Compressor1
3. Condenser Fan1
4. Compressor2
5. Condenser Fan2
6. Compressor3
7. Condenser Fan3
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