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Extreme temperature hazard . Can cause damage to
system components .
The MicroTech III controller is designed to operate in ambient temperatures
from -20°F to 125°F. It can be stored in ambient temperatures from -40°F
to 140°F. It is designed to be stored and operated in relative humidity up to
95% (non-condensing).
Excessive moisture in the control panel can cause
hazardous working conditions and improper equipment
operation .
When servicing this equipment during rainy weather, the electrical
components in the main control panel must be protected from the rain.
Static sensitive components . A static discharge while
handling electronic circuit boards can cause damage to
the components .
Discharge any static electrical charge by touching the bare metal inside the
main control panel before performing any service work. Never unplug any
cables, circuit board terminal blocks, relay modules, or power plugs while
power is applied to the panel.
Figure 2: Inter Component Communications Diagram
01
SAF
ECM
NOTE: See
"IFBCommStatus" on page 70
DataRcvd" on page 71
Resistance/Temperature Characteristics" on
page 85
Section of this manual if there are any
questions about the communications from component
to component .
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CAUTION
WARNING
CAUTION
MicroTech
III Unit Controller
®
Modbus Communication
02
04
ExFan
OA Fan
ECM
VFD/ECM
and
"ACS1
and the
"Thermistor
Getting Started
This manual contains information designed to assist the field
technician with unit setup . The technician will need to be
familiar with the following topics at a minimum to successfully
set up unit operation .
• Keypad Navigation/Editing/Passwords
• Control Mode
• Heat/Cool Changeover
• Compressor Capacity
• Supply Fan Capacity
• Exhaust Fan Capacity
IFB
06
VarCmp
Drive
07
08
ACS Comm
INV
CMP
INV
OA
Fan1
INV
OA
Fan2
5
OM 1263 • MICROTECH UNIT CONTROLLER
Introduction
09
ACS Comm
EVB
EVO
Heat Pump Only
ORT
Heat Pump Only
EVI
IRT
Heat Pump Only
Introduction
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