OM 1239
19 www.DaikinApplied.com
Fan operation during most
modes, faults and shutdowns
The MicroTech III unit controller allows fan operation
during most modes, faults and shutdowns to facilitate
maximum space comfort and control. However, the
fan does not operate during brownout or emergency
shutdown condition. During most modes, faults, or
shutdowns the fan will operate normally:
Operation with the high speed jumper
•
The MicroTech III unit controller includes a high-
speed jumper terminal labeled JP1 to speed system
check out and troubleshooting. See Figure 5 on page
9
for JP1 location.
Note:
This jumper is intended for factory unit testing
and should only be used by trained service tech-
nicians as several timing functions are reduced to
speed system check out.
•
Disconnect power to the unit when installing or
removing the high-speed jumper.
•
The high speed jumper should only be used for a
short period of time for testing of the unit’s operation
by a trained service technician. The jumper must be
removed for normal unit operation.
•
If the jumper is left on after system check out, the
unit may be damaged.
Table 9: Room sensor status LED
LED On
Time (Sec)
LED Off
Time (Sec)
Operating Mode
0.5
0.5
Alarm Condition or Network “Wink”
Operation Active
0.0
Continually
Bypass Mode is Active
0.5
5.5
Unoccupied Mode
5.5
0.5
Standby Mode
Continually
0.0
Occupied Mode
Faults and modes
Table 10: Priority level of faults and modes
Alarm
Priority
Alarm
Identifier
Mode or Fault
1
1
I/O Expansion Communication Fail
2
2
Invalid Configuration
3
3
Low Voltage Brownout
4
4
Comp#1 High Pressure
5
5
Comp#2 High Pressure
6
6
Comp#1 Low Pressure
7
7
Comp#2 Low Pressure
8
8
Comp#1 Suction Temp Sensor Fail
9
9
Comp#2 Suction Temp Sensor Fail
10
12
Freeze Fault Detect
(Freeze Fault Protection Only)
11
10
Comp#1 Low Suction Temp
12
11
Comp#2 Low Suction Temp
13
13
Room Temp Sensor Fail
(Room Sensor Control Only)
14
14
Entering Water Temp Sensor Fail
(Boilerless EH, Hydro Heat, Hydro Cool Only)
15
15
Leaving Water Temp Sensor Fail
(Freeze Fault Protection Only)
16
16
Condensate Overflow
(Cooling & Dehumidification Modes Only)
17
17
Low Entering Water Temp
(No Display with Boilerless EH)
18
18
Serial EEPROM Corrupted
19
19
Waterside Economizer Low Temp Cutout
(WSE Control & Call For Cooling Only)
M
ICro
t
eCh
III u
nIt
C
ontroller
