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WATER-COOLED SCREW CHILLER

MICROTECH III and MICROTECH 4

REV

Date

05/2021

Supersedes

D–EOMWC00A07-16_01EN

CONTROL PANEL OPERATING MANUAL

D–EOMWC00A07-16_02EN

 
 
 
 
 
 
D–EOMWC00A07-16_02EN 
Operation Manual 
2/77 
 
Table of Contents 
INTRODUCTION .................................................................................................................................... 4 
CONTROLLER OPERATING LIMITS .................................................................................................... 5 
CONTROLLER FEATURES .................................................................................................................. 5 
GENERAL DESCRIPTION..................................................................................................................... 6 
1  GENERAL DESCRIPTION .................................................................................................................... 6 
2  OPERATION COMMANDS LAYOUT ....................................................................................................... 6 
3  CONTROLLER DESCRIPTION ............................................................................................................... 7 
4  CONTROL NETWORK DETAILS ............................................................................................................10 
SEQUENCE OF OPERATION ..............................................................................................................11 
CONTROLLER OPERATION ...............................................................................................................14 
1  MICROTECH INPUTS/OUTPUTS ..........................................................................................................14 
2  EXTENSION I/O COMPRESSOR #1 TO #3 ............................................................................................14 
3  I/O EXV CIRCUIT #1 TO #3 ...............................................................................................................15 
4  EXTENSION I/O FAN MODULE CIRCUIT #2 ..........................................................................................16 
5  EXTENSION I/O FAN MODULE CIRCUIT #3 ..........................................................................................16 
6  EXTENSION I/O UNIT HEAT PUMP (OLD VERSION) ..............................................................................16 
7  EXTENSION I/O UNIT HEAT PUMP (NEW VERSION)..............................................................................16 
8  SETPOINTS......................................................................................................................................16 
UNIT FUNCTIONS ................................................................................................................................17 
1  CALCULATIONS ................................................................................................................................17 
2  UNIT MODEL....................................................................................................................................17 
3  UNIT ENABLE...................................................................................................................................17 
4  UNIT MODE SELECTION ....................................................................................................................17 
5  UNIT CONTROL STATES ....................................................................................................................18 
6  UNIT STATUS...................................................................................................................................19 
7  ICE MODE START DELAY ..................................................................................................................19 
8  EVAPORATOR PUMP CONTROL..........................................................................................................19 
9  CONDENSER PUMP CONTROL ...........................................................................................................20 
10  CONDENSATION CONTROL ................................................................................................................20 
11  LEAVING WATER TEMPERATURE (LWT) RESET ..................................................................................22 
12  UNIT CAPACITY CONTROL ................................................................................................................23 
13  UNIT CAPACITY OVERRIDES ..............................................................................................................25 
14  ENERGY SAVING MODE ....................................................................................................................26 
15  DAIKIN ON SITE................................................................................................................................26 
CIRCUIT FUNCTIONS ..........................................................................................................................27 
1  CALCULATIONS ................................................................................................................................27 
2  CIRCUIT CONTROL LOGIC .................................................................................................................28 
3  CIRCUIT STATUS ..............................................................................................................................29 
4  COMPRESSOR CONTROL ..................................................................................................................29 
5  PRESSURE CONDENSATION CONTROL ................................................................................................31 
6  EXV CONTROL ................................................................................................................................32 
7  LIQUID INJECTION ............................................................................................................................33 
SOFTWARE OPTIONS .........................................................................................................................34 
2  INSERTING THE PASSWORD IN A SPARE CONTROLLER .........................................................................34 
ALARMS AND EVENTS .......................................................................................................................36 
1  ALARM LOGGING..............................................................................................................................36 
2  SIGNALING ALARMS .........................................................................................................................36 
3  CLEARING ALARMS ..........................................................................................................................36 
4  UNIT RAPID STOP ALARMS ...............................................................................................................37 
5  UNIT PUMPDOWN STOP ALARMS .......................................................................................................41 