Alarm And Fault Monitoring; Alarm Types - Daikin MicroTech Operation And Maintenance

Alarm and Fault Monitoring

The most important aspect of troubleshooting unit ventilator
controls is to isolate the source of the problem into one of two
categories:
1. The problem resides within the UVC (hardware or
software).
2. The problem is external to the UVC. Under most
circumstances the problem is external to the UVC.
The UVC is programmed to monitor the unit for specific alarm
conditions.

Alarm Types:

• Auto: Alarm clears automatically when the condition
clears
• 2-Auto in 7 Days then Manual: Alarm clears
automatically unless the alarm has occurred 3 or more
times within 7 days; in that case the alarm must be
cleared manually
• Manual: The alarm must be cleared manually
Table 25: Alarm and Fault Code Summary
Alarm
Name
Number
1 ShutdownDIAlarm
2 SpaceTempSensorAlarm
3 HighDxPressureAlarm
4 DATLLDxAlarm
5 CondensateOverflowAlarm
6 IndoorAirCoilDxTempSensorAlarm
7 OATSensorAlarm
8 DATSensorAlarm
9 OutdoorAirCoilDxTempSensorAlarm
10 WaterCoilDxTempSensorAlarm
11 WaterOutTempSensorAlarm
12 WaterInTempSensorAlarm
13 SpaceHumiditySensorAlarm
14 OutdoorHumiditySensorAlarm
15 SpaceCO SensorAlarm
2
16 WaterInTempInadequateAlarm
17 WaterCoilFreezeAlarm
18 LowSuctionLineTempAlarm
19 CantCoolAlarm
20 CantHeatAlarm
21 DATLLAlarm
22 BrownoutAlarm
23 HighVoltageAlarm
24 ChangeFilterAlarm
25 LowOACoilTempAlarm
26 ReturnTempSensorAlarm
27 FactoryConfigStrigAlarm
28 ControlTempAlarm
29 ConfigurationAlarm
30 ControlBoardAlarm
31 WaterCoilFreezeFaultAlarm
OM 1280-2 • MICROTECH UNIT CONTROLLER
If an alarm condition exists, a fault occurs. When a fault exists,
the following occurs:
• The UVC indicates the fault condition by displaying the
fault code on the optional keypad/display
• The remote wall-mounted sensor (optional) Status
Indicator flashes a pattern indicating that a fault condition
exists
• The fault signal binary output energizes
• The fault performs the appropriate control actions as
described for each fault
Manual reset faults can be reset in one of four ways:
• By cycling the unit power
• Via the keypad/display menu
• Via the network interface
• Via an input from a remote mounted space sensor
Type Priority Label
Fault 3 Shutdown Discrete Input Fault
Problem 8 Space Temp Sensor Failure
Problem 9 High DX Pressure Fault
Problem 10 Discharge Air DX Low Limit Violation
Problem 11 Condensate Overflow Indications
Problem 12 Indoor Air Coil Dx Temp Sensor Failure
Fault 4 Outdoor Air Temp Sensor Failure
Fault 5 Discharge Air Temp Sensor Failure
Problem 13 Outdoor Air Coil DX Temp Sensor Failure
Problem 14 Water Coil DX Temp Sensor Failure
Problem 15 Water-out Temp Sensor Failure
Problem 16 Water-in Temp Sensor Failure
Problem 17 Space Humidity Sensor Failure
Problem 18 Outdoor Humidity Sensor Failure
Problem 19 Space CO
Source Temp (Water-in)
Problem 20
Inadequate Indication
Problem 21 Hydronic Water Coil Freeze Stat
Problem 22 Low Suction Line Temp Failure
Problem 23 Can't Cool
Problem 24 Can't Heat
Problem 25 DAT Low Limit
Problem 26 Brownout Problem
Problem 27 High Voltage Problem
Warning 32 Change Filter Indication
Problem 28 Low Outside Air Coil Temp
Problem 29 Return Temp Sensor Failure
Fault 6 Factory Configuration String Problem
Fault 7 Control Temp Not Available
Warning 30 Configuration Issue
Fault 2 Control Board Hardware Failure
Fault 7 Hydronic Water Coil Freeze Fault
53
Diagnostics and Service
Sensor Failure
2
Diagnostics and Service
MultComp
Reset
Alarm
Auto
Auto
2-Auto in 7-days
X
then manual
Auto
Auto
Auto X
Auto
Auto
Auto X
Auto X
Auto
Auto
Auto
Auto
Auto
Auto
Auto
2-Auto in 7-days
then manual
Auto
Auto
Auto
Auto X
Auto X
Manual
Auto
Auto
Manual
Manual X
Auto
Auto
Auto
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