Name: Quantech QWC3050T-200T
Brand: Quantech
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SECTION 9 – SERVICE AND TROUBLESHOOTING

FORM QWC3-NM1

ISSUE DATE:11/20/2020

QUANTECH

165

PROBLEM CAUSE SOLUTION

LACK OF COOLING EFFECT

1. Fouled evaporator surface Low

suction pressure will be observed.

1. Contact the local Quantech Sales

Representative.

2. Improper ow through the

evaporator.

2. Reduce ow to within chiller design

specs. See Limitations in SECTION

4 - INSTALLATION.

3. Low refrigerant charge. Low

suction pressure will be observed.

3. Check subcooling and add charge

as needed.

TABLE 26 - TROUBLESHOOTING (CONT’D)

Default Chapter5
- Table of Contents5
Section 1 - General Chiller Information and Safety11
- Introduction11
- Safety11
- Warranty11
- Misuse of Equipment12
- FIGURE 1 - QWC3 Water Cooled Liquid Chiller13
- Condenser14
- Evaporator14
- Microprocessor Control Center14
- Refrigerant Circuit14
- Power Panel15
- Accessories and Options16
- Control / Power Panel Components18
Section 2 - Product Description13
- Compressors13
- Introduction13
- Refrigerant Circuits13
  - FIGURE 2 - Control / Panel Compowwnents18
  - Product Identification Number (Pin)22
- FIGURE 3 - Control Power Panel Components19
- Unit Components20
FIGURE 6 - Refrigerant Flow Diagram26
FIGURE 7 - Process and Instrumentation Diagram27
Section 3 - Transportation, Handling and Storage29
- Delivery and Storage29
- Inspection29
- Moving the Unit29
- Lifting Weights30
FIGURE 8 - Chiller Rigging and Lifting Weights30
Section 4 - Installation31
- Foundation31
- Installation Checklist31
- Location Requirements31
- Unit Isolation (Noise Sensitive Location)31
- Installation of Vibration Isolators32
- Pipework Connection32
- FIGURE 9 - ANSI/AWWA C-606 - Adapter Flanges34
- Option Flanges34
- Refrigerant Relief Valve Piping34
- Water Treatment34
- Condenser Cooling Liquid Systems35
- FIGURE 10 - Direct Pressure Control Diagram35
- Connection Types and Sizes36
- Pipework Arrangement36
- Pressure Tapping36
FIGURE 12 - Chilled Liquid System36
FIGURE 13 - Condenser Cooling Liquid System36
FIGURE 14 - Pipework Arrangements Legend36
FIGURE 15 - Cooler Connections36
FIGURE 16 - Control Wiring40
Section 5 - Technical Data41
- Operational Limitations41
- Condenser Pressure Drop Charts44
- FIGURE 25 - Power Circuit, 4 Compressor with Circuit Breaker71
- FIGURE 26 - Power Circuit, 5 and 6 Compressor72
- FIGURE 27 - Power Circuit, 6 Compressor73
- Connection Wiring Diagram74
Section 6 - Commissioning105
- Preparation - Power off105
- FIGURE 35 - EEV IB-G Interface Board106
- Preparation - Power on107
- Unit Operating Sequence111
Section 7 - Unit Controls113
- Introduction113
- Status Key115
- Status Key Messages120
- Display/Print Keys121
- TABLE 11 - Cooling Setpoints, Programmable Limits and Defaults132
- TABLE 12 - Program Key Limits and Default135
- TABLE 13 - Setpoints Quick Reference List136
- Unit Keys137
FIGURE 36 - Unit Keys Options Programming Quick Reference List143
Section 8 - Unit Operation145
- Capacity Control145
- Discharge Pressure Limit Controls145
- Leaving Chilled Liquid Control145
- Suction Pressure Limit Controls145
- Leaving Chilled Liquid Control Override to Reduce Cycling146
- Leaving Chilled Liquid System Lead/Lag and Compressor Sequencing146
- Return Chilled Liquid Control147
Section 9 - Service and Troubleshooting153
- Clearing History Buffers153
- Service Mode153
- Service Mode - Outputs153
- Inputs154
- Service Mode - Analog and Digital154
- Service Mode - Chiller Configuration154
- Control Inputs/Outputs155
- TABLE 18 - I/O Digital Inputs155
- Microboard Layout156
TABLE 26 - Troubleshooting163
Section 10 - Maintenance167
- Compressors167
- Important167
- On-Board Battery Back-Up167
- Operating Parameters167
- Overall Unit Inspection167
- Bacnet and Modbus Data Communications168
- FIGURE 41 - Micro Panel Connections169
- TABLE 27 - Values Required for Bas Communication169
- TABLE 28 - Real Time Error Numbers170
- TABLE 29 - BACNET and Modbus Communications Data Map171
- TABLE 30 - Yorktalk 2 Communications Data Map176
- Temperature Conversion Chart182
- Pressure Temperature Chart183
- R410-A183
- Temperature184
TABLE 31 - si Metric Conversion184

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General

Brand	Quantech
Model	QWC3050T-200T
Category	Chiller
Language	English

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