Daikin McQuay AGZ-D, Operating And Maintenance Manual, Page: 2 / 82

2 AGZ 025D through 190D OMM 1087
Table of Contents
Introduction........................................3
Operating/Standby Limits............................ 9
Pressure Drop Curves........................9
MicroTech

III Controller .............13
Controller Section Table of Contents ........ 13
Security...................................................... 20
Unit Functions ..................................20
Definitions ................................................. 20
Unit Enable................................................ 21
Unit Mode Selection.................................. 22
Unit States ................................................. 22
Power Up Start Delay ................................ 23
Ice Mode Start Delay................................. 23
Unit Status ................................................. 23
Evaporator Pump Control.......................... 24
LWT Target................................................ 25
Unit Capacity Control................................ 26
Unit Capacity Overrides ............................ 27
Circuit Functions .............................29
Definitions ................................................. 29
Circuit Control Logic ................................ 29
Pumpdown Procedure................................ 31
Low Ambient Starts ................................... 31
Circuit Status ............................................. 31
Compressor Control................................... 31
Condenser Fan Control.............................. 32
EXV Control.............................................. 34
Liquid Line Solenoid Valve....................... 35
Hot Gas Bypass Solenoid Valve ................ 35
Capacity Overrides – Limits of Operation. 35
Alarms...............................................35
Unit Fault Alarms ...................................... 35
Unit Problem Alarms ................................. 37
Unit Warning Alarms .................................38
Circuit Fault Alarms...................................38
Circuit Events.............................................40
Circuit Warning Alarms .............................41
Events ............................................... 41
Unit Events ................................................42
Circuit Events.............................................42
Clearing Alarms .........................................43
Using the Controller ....................... 44
Navigating..................................................45
Menus.........................................................47
Optional Low Ambient Fan VFD .. 60
VFD Interface (HMI).................................61
Recommended Periodic Inspection............65
Optional BAS Interface .................. 65
Startup.............................................. 66
Operation ......................................... 68
Unit Maintenance............................ 72
Planned Maintenance Schedule .................73
Service .............................................. 74
R-410A.......................................................74
Refrigerant Charging .................................75
Liquid Line Solenoid Valve .......................77
Evaporator..................................................77
AGZ-D Troubleshooting Chart...... 78
Warranty Statement ....................... 80
Cover picture: AGZ 190D, 190 nominal tons capacity.
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