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Contents
Introduction..................................3
MicroTech III Unit Controller ....................5
MicroTech III unit controller and I/O expansion module
connections.................................5
BACnet communication module .................8
LonWorks communication module ..............8
Replacing a MicroTech III circuit board:...........9
Initial power-up...............................9
Pre start check list: ...........................9
I/O expansion module jumper settings ...........10
General use and information...................11
Sequence of operations ......................11
Dehumidication ............................12
Available operating modes ....................12
MicroTech III unit protection ...................12
Fault status and LED annunciation ..............14
[A and IV/PR (H8)]...........................16
Fault recovery and reset ......................17
Fan operation during most modes, faults and
shutdowns..................................19
Faults and modes ...........................19
Microtech III unit controller interface to external
equipment ..................................21
Appendix A .................................21
Operation and maintenance of I/O expansion
module ...................................21
Initial power up .............................21
I/O expansion module faults and fan operating
modes ....................................22
Unit options.................................23
Hot gas reheat with temperature control application 23
Hot gas reheat dehumidication only ............23
Appendix B .................................25
MicroTech III unit controller with LonWorks®
communication module .......................25
MicroTech III controller with an optional BACnet
®
communication module .......................26
Typical Wiring Diagrams ......................27
Troubleshooting the water source heat pump unit 31
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