Replacing A Microtech Iii Circuit Board; Initial Power-Up; Pre Start Check List - Daikin Microtech III Operation And Maintenance Manual

CAUTION
The MicroTech III circuit board incorporates static sensitive
devices. A static charge from touching the device can damage the
electronic components. To help prevent damage during service,
use static discharge wrist straps.Static discharge wrist straps are
grounded to the heat pump chassis through a 1 Mohm resistor.
Replacing a MicroTech III
circuit board:
1 . Connect wrist strap to unit.
2 . Remove faulty board and place on static protected
surface.
3 . Remove replacement board from static protected
bag.
Note: Do not touch circuit board; hold by edges.
4 . Holding board in grounded hand, install board in
unit.
5 . Insert faulty board in empty static bag for return.
Note: Table 6 are the settings of the hardware configuration jumpers that are read when the controller is powered.
Any changes to the jumper settings require cycling power to the controller or sending a controller a reboot
command through the network communications.
Table 6: MicroTech III controller configuration jumper settings
Baseboard Description
Normal / Test Mode
Fan Operation
Loop Fluid
Freeze Fault Protection
Room Sensor Setpoint
Potentiometer Range
Thermostat / Room Sensor
Compressor Availability
Jumper JP3 is factory provided in the open position. Extended range units require freeze protection down to 15 degrees. Jumper JP3 must
be field configured.
OM 1239
Jumper(s) Jumper Setting
Open
JP1
Shorted
Open
JP2
Shorted
Open
JP3
(see warning)
Shorted
Open
JP4
Shorted
Open
JP5
Shorted
Open
JP6
Shorted
JP7 Open
JP8 Open
JP7 Shorted
JP7 & JP8
JP8 Open
JP7 Open
JP8 Shorted
WARNING
M

Initial power-up

Pre start check list:

A random start delay time between 300 and 360 seconds
is generated at power up.
Figure 5: Location of configuration jumpers on the
MicroTech III control board
Normal Operation
Service / Test Mode
Continuous Fan Operation (On), when not operating in the unccupied mode.
Cycling Fan Operation (Auto)
Water Loop Fluid - Water freeze protection (factory default setting)
Glycol Loop Fluid - Systems with anti-freeze protection
Freeze fault protection enabled
Short Range: -5 to +5 ºF (-2.78 to +2.78 ºC)
Long Range: 55 to 95ºF (12.78 to 35ºC)
Thermostat Control
Room Sensor Control
Both Compressors Available (default)
One Compressor Available
No Compressors Available
9
t III u C
ICro eCh nIt ontroller
Function
None
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