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Table 14 - Operational And Fault / Inhibit Codes - Quantech QTC4 STYLE A Series Installation Operation & Maintenance

Air-cooled screw liquid chillers with variable speed drive, 150 - 500 tons, 525 - 1750 kw, 2 compressor, 60 hz.
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SECTION 7 - OPERATION

TABLE 14 - OPERATIONAL AND FAULT / INHIBIT CODES

Code
QTC4/F A Operational Code
Value
63
Manual Override
64
Daily Schedule Shutdown
65
Unit Switch OFF
66
Remote Controlled Shutdown
67
Loss of External Communications
68
Flow Switch Shutdown
69
VSD Cooling Shutdown
70
Serial Number Shutdown
74
No Run Permissive
75
Anti-Recycle Timer Active
76
System Switch OFF
77
System Not Running
78
System Running
79
Discharge Pressure Limiting
80
Suction Pressure Limiting
81
Motor Current Limiting
82
Free Cooling
83
ISN Motor Current Limiting
84
Remote Motor Current Limiting
85
System Pumping Down
86
VSD PreCharging
87
VSD Baseplate Temp Limiting
88
VSD Internal Ambient Temp Limiting
89
Sound Limiting
90
ISN Sound Limiting
91
Remote Sound Limiting
92
Pulldown Motor Current Limiting
93
Cooling Demand Shutdown
106
Operational and Fault/Inhibit Codes
OPER.CODE
Code
QTC4 /FA Fault/Inhibit Code
Value
FAULT/INHIBIT.CODE
0
No Fault/Inhibit
1
Low Ambient Temperature
2
High Ambient Temperature
3
Low Chilled Liquid Temperature
4
VSD Initialization Failure
5
Low RTC Battery Voltage
6
Invalid Number of Compressors Selected
7
VSD Communications Failure
8
Pre-charge Low DC Bus Voltage
9
Pre-charge DC Bus Voltage Imbalance
10
High DC Bus Voltage
11
Low DC Bus Voltage
12
DC Bus Voltage Imbalance
13
High VSD Ambient Temperature
14
Single Phase Input
15
VSD Power Supply Fault
16
VSD Logic Board Fault
17
Motor Current Overload (Hardware)
18
CT Plug Fault
27
High Discharge Pressure (Software)
28
High Differential Oil Pressure
29
Low Differential Oil Pressure
30
Low Suction Pressure
31
High Discharge Temperature
33
Eductor Clog Fault
34
Sensor Failure
35
Low Motor Current
36
High Motor Temperature
37
Pre-charge Low DC Bus Voltage
38
Pre-charge DC Bus Voltage Imbalance
39
High DC Bus Voltage
40
Low DC Bus Voltage
41
DC Bus Voltage Imbalance
42
High Motor Current
43
Motor Current Overload (Software)
44
IGBT Gate Driver Fault
45
High Baseplate Temperature
46
Single Phase Input
47
VSD Run Signal Fault
48
High Discharge Press (Hardware – HPCO)
50
Control Voltage Fault
51
Low Discharge Superheat
FORM QTC4-NM1
ISSUE DATE: 4/2/2018
QUANTECH

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