Daikin MICROTECH 4 Operation Manual page 128

UNIT MAINTENANCE AND SERvICE
Problems
Problems class alarms will not cause the unit to shut down completely but generally mean unit operation is altered in some way .
Table 61: Main Menu \ Service Menus \ Problem Alarms
Alarm Number Alarm Display
Name
0 No Active Problems
101 MHGRhtVlv1:
Problem
105 DRT1 Sensor:
Problem
or
or
106
DRT2 Sensor:
Problem
109 ProtIntrlck: Problem
110 VCmp1: Problem
or or
111 VCmp2: Problem
115 SRT Sensor 1:
Problem
or
or
116
SRT Sensor 2:
Problem
120 Hi DL Temp_1:
Problem
or
or
121
Hi DL Temp_2:
Problem
125 Exp Valve 1:
Problem
or
or
126
Exp Valve 2:
Problem
130 OA Fan 1: Problem
or or
131 OA Fan 2: Problem
135 PTS1 Sensor:
Problem
or
or
136
PTS2 Sensor:
Problem
DAIKIN APPLIED
Description
No Active Problems .
The MHGRhtVlv1 Problem occurs when MHGRht valve synchronization sequence
has started and is not completed successfully. As a result, the Dehumidification
operation will be disabled unless primary heat back up reheat is available . This
problem requires a Manual clear of the alarm .
This alarm occurs when the DRT1 or DRT2 (Discharge Refrigerant Temperature)
sensor input is shorted or open circuited for the Sensor Alarm Delay (default 30
seconds). It can also occur when the variable speed compressor is off and the input
is above 329°F or the compressor has been off for 20 minutes and the input is below
-4°F . When this alarm is active compressor cooling operation is disabled . The alarm
must be manually cleared once corrective action is taken .
When configured for refrigeration only control there is generic interlock digital input
defined that must be made to allow cooling operation (for an airflow switch for
example). If the field calls for cooling but this input in not made you end up with the
ProtIntrlck: Problem alarm.
If the Variable Speed Compressor on Circuit 1 or Circuit 2 is enabled and
commanded to run for 30 seconds but the controller fails to receive the variable
speed run verification input the variable speed compressor is cycled OFF (a variable
speed Compressor Emergency Stop Control Event is logged) for 5 seconds and then
back on. The variable speed compressor is then ramped to 45%. If this occurs 5
times in a 100 min period the variable speed compressor is shut off and the VCmp1
or VCmp2: Problem alarm is generated . This alarm must be manually cleared once
corrective action is taken .
This alarm occurs when the SRT1 Sensor (Suction Refrigerant Temperature) sensor
input is shorted or open for the Sensor Alarm Delay (default 30s) It can also occur
when the variable speed compressor is off and the input is above 329°F.
Normal compressor control is limited when a high discharge line temperature
conditions occur. If the variable speed compressor is operating and the discharge
line temperature is greater than 250°F for 15 seconds a High Discharge Line
Temperature Event is generated and the variable speed compressor capacity is
reduced every 15 seconds until the discharge line temperature falls below 220°F .
If the discharge line temperature is above 250°F continuously for 3 minutes the
variable speed compressor is stopped and a High Discharge Line Temperature
problem alarm is generated . The alarm must be manually cleared .
Exp Valve 1 or 2 Problem indicates the EVI valve resync Counter is greater than or
equal to 4 or that EVI synchronization sequence is not completed within 60 seconds.
This alarm must be manually cleared once corrective action is taken .
Outdoor Fan 1 or 2 Problem indicates .
PTS1 or 2 Sensor Problem indicates the a sensor malfunction . This alarm is present
when the following is true for 30 seconds where PTS<96kPa and the CircState is
not in pumpdown or where the following is true for 30 minutes; the SSH1-SSHSpt
>20.0°F, DSH1<5.0°F, and EVI Pos >95%. This alarm must be manually cleared
once corrective action has been taken .
128
MICROTECH UNIT CONTROLLER