Fan Operation During Most Modes, Faults And Shutdowns - Daikin MicroTech III Operation & Maintenance Manual

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 emergency shutdown or brownout
condition. During most modes, faults, or shutdowns the fan
will operate under the following conditions:
1. In occupied modes, the thermostat inputs G, Y1, or
W1 are energized.
2. In unoccupied mode, the thermostat input W2 is
energized.
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 trouble-shooting. See Figure 2 on
page 6 for JP1 location.
Note: This jumper is intended for Daikin factory unit
testing and should only be used by trained ser-
vice technicians 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.
Table 5: MicroTech III Unit Controller Status LED's
Description
Emergency Shutdown
Low Voltage Brownout
Compressor #1 High Pressure (HP1)
Compressor #1 Low Pressure (LP1)
Compressor #1 Low Suction Temp (LT1) Sensor Fail
Compressor #1 Low Suction Temp (LT1)
Room Temp Sensor Fail
(with Room Sensor Control Only)
Condensate Overflow
(Cooling & Dehumidification Modes Only)
Low Entering Water Temp
(Heating Compressor Inhibit; No Display with Boilerless EH)
Serial EEPROM Corrupted
Service Test Mode Enabled
Unoccupied Mode
Occupied, Bypass, Standby, or Tenant Override Modes
OM 931-6 • MicroTech III Unit Controller for WSHP
M
■ If the jumper is left on after system check out, the
unit may be damaged.
Priority of Faults and Modes
The MicroTech III unit controller is configured with mode
and fault priorities. Table 4 illustrates that the lower the
priority level number, the higher the priority of the fault or
mode. There are some exceptions to this priority list. For
example, tenant override has no affect on occupied modes.
Table 4: Priority Level of Faults and Modes
Priority Level
1
2
3
4
5 Compressor Suction Temp Sensor Fail
6
7
8
9
10
11
12
13
14
15 Occupied, Bypass, Standby or Tenant Override
Type Yellow
Mode OFF
Fault OFF
Fault OFF
Fault OFF
Fault Flash
Fault Flash
Fault Flash
Fault ON
Fault Flash
Fault ON
Mode Flash
Mode ON
Mode OFF
12
t III u C
ICro eCh nIt ontroller
Mode or Fault
Emergency Shutdown Mode
Brownout
Compressor High Pressure
Compressor Low Pressure
Compressor Low Suction Temp
Room Temp Sensor Fail
EWT Sensor Fail
Condensate Overflow
Serial EEPROM Corrupted
Invalid Jumper Configuration
Low Entering Water Temp
Service Test Mode
Unoccupied Mode
Green Red
Flash OFF
Flash OFF
OFF Flash
OFF ON
Flash ON
OFF OFF
Flash ON
OFF OFF
OFF Flash
ON ON
Flash Flash
ON OFF
ON OFF
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