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Thermal Care
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NQA25
Thermal Care NQA25 User Manual
76 pages
Manual
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Installation & Operation Manual
NQ Series Port
able and Remote
Condenser Chillers
2
Table of Contents
Default Chapter
4
Table of Contents
4
Installation - Remote Air-Cooled Condenser
29
Location
29
Mounted Legs and Lifting (5 - 10 Ton Units)
29
Mounted Legs and Lifting (15 - 40 Ton Units)
30
Interconnecting Refrigerant Piping
30
Refrigeration Piping Design
30
Determining Equivalent Line Length
32
Liquid Line Sizing
33
Discharge (Hot Gas) Line Sizing
36
Calculating System Refrigerant and Oil Charge
38
Oil Charge Determination
38
Setting Condenser Fan Controls
38
Installation - Electrical
39
Standard Controller Operation
49
Start Button
49
Stop Button
49
Alarm Silence / Alarm Reset Button
49
Compressor Running Hours Button
49
Pump Running Hours Button
50
Pump Test Button
50
Display/Program Button
50
Up Button
50
Down Button
50
Control Power on LED
50
Autostart Signal LED
50
Pump LED
51
Hot Gas Bypass LED
51
Compressor #1 LED
51
Compressor #2 LED
51
Temperature Limit LED
51
Electrical Phase Error LED
51
Low Flow LED
51
Freezestat LED
52
Low Reservoir Level LED
52
Compressor Recycle LED
52
High Refrigerant Pressure LED
52
Low Refrigerant Pressure LED
52
Program Mode LED
52
Set Point Temperature Display
52
Process Temperature Display
52
Program Menu
52
SPI Communications (Optional)
56
Modbus RTU (Optional)
57
Optional Controller Operation
60
Start-Up Screen & Thermal Care Contact Information
60
Main Screen
60
Local/ Remote Button (Press to Toggle)
60
Start Button
60
Stop Button
60
Set Point Temperature Display & Entry
60
Actual Supply Water Temperature Display
60
Alarms Button
60
Setup Button
60
Active Alarms Screen
61
Alarm Reset Button
61
Alarm History Button
61
Main Button
61
Alarm History Screen
61
Up and down Buttons
61
Acknowledge Button
61
Alarms Button
61
Process Diagnostic Button
61
Compressor Setup Screen
62
Process Setup Button
62
PID Setup
62
Freezestat Setup Button
62
Main Button
62
Process Setup Screen
62
HGBP PID Button
62
Compressor Setup Button
62
Main
62
Hot Gas Bypass Screen PID Tuning Screen
63
Refrigeration Diagnostic Button
63
Compressor Setup Button
63
Main Button
63
Freezestat Setup Screen
63
HGBP PID Button
63
Main
63
Process Diagnostic Screen
64
I/O Status Button
64
Alarms Button
64
Setup Button
64
Main
64
I/O Status Screen
64
Output Designation Button
64
Input Status Button
64
Refrigeration Diagnostic Screen
65
I/O Status Button
65
Setup Button
65
Process Diagnostic Button
65
Main
65
Start-Up
65
Step 1 - Connect Main Power
66
Step 2 - Fill Coolant Circuit
66
System Fill Water Chemistry Requirements
66
Step 3 - Check Condenser
67
Intergral Air-Cooled Condenser Check
67
Water-Cooled Condenser Check
67
Remote Air-Cooled Condenser Check
67
Step 4 - Check Refrigerant Valves
68
Step 5 - Verify Freezestat Setting
68
Step 6 - Turn on Control Power
68
Step 7 - Establish Coolant Flow
68
Step 8 - Intial Unit Operation
68
Preventive Maintenance
69
Once a Week
69
Once a Month
69
Every Three Months
69
Preventive Maintenance Checklist
70
General Troubleshooting
71
Drawings
72
Warranty
73
Extended 5 Year Compressor Warranty - (Optional)
74
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Thermal Care NQA25 Specifications
General
Tons
25
Cooling Capacity
300, 000 BTU/hr
Compressor Type
Scroll
Refrigerant
R410A
Voltage
460/3/60
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