GC Series Modular Central Chillers Part Number: 882.01846.00 Bulletin Number: HC4-680 Effective: 7/01/2011 Write Down Your Serial Numbers Here For Future Reference: _________________________ _________________________ _________________________ _________________________ _________________________ _________________________ We are committed to a continuing program of product improvement. Specifications, appearance, and dimensions described in this manual are subject to change without notice. ECN No.
Shipping Information Unpacking and Inspection You should inspect your equipment for possible shipping damage. Thoroughly check the equipment for any damage that might have occurred in transit, such as broken or loose wiring and components, loose hardware and mounting screws, etc. In the Event of Shipping Damage According to the contract terms and conditions of the Carrier, the responsibility of the Shipper ends at the time and place of shipment.
TABLE OF CONTENTS CHAPTER 1: SAFETY ................................................................ 5 1-1 How to Use This Manual .............................................................................................. 5 Safety Symbols Used in this Manual ..................................................................... 5 1-2 Warnings and Precautions ........................................................................................... 6 1-3 Responsibility ...
5-1 5-2 5-3 Lubrication ................................................................................................................. 42 Filter Cleaning ............................................................................................................ 42 Maintaining the Condenser ........................................................................................ 42 Air- and Remote Air-Cooled Chillers ................................................................
Chapter 1: 1-1 Safety How to Use This Manual Use this manual as a guide and reference for installing, operating, and maintaining your equipment. The purpose is to assist you in applying efficient, proven techniques that enhance equipment productivity. This manual covers only light corrective maintenance. No other maintenance should be undertaken without first contacting a service engineer. The Functional Description section outlines models covered, standard features, and optional features.
1-2 Warnings and Precautions Our equipment is designed to provide safe and reliable operation when installed and operated within design specifications, following national and local safety codes. To avoid possible personal injury or equipment damage when installing, operating, or maintaining this equipment, use good judgment and follow these safe practices: ü Follow all SAFETY CODES. ü Wear SAFETY GLASSES and WORK GLOVES. ü Disconnect and/or lock out power before servicing or maintaining the equipment.
Chapter 2: 2-1 Functional Description Models Covered in This Manual This manual provides operation, installation, and maintenance instructions for air-, water-and remote air-cooled central chillers. Model numbers are listed on the serial tag. Make sure you know the model and serial number of your equipment before contacting the manufacturer for parts or service.
Process Fluid Temperature – The standard range for the leaving fluid temperature for this series of chillers is 20°F to 80°F (-6.7°C to 26.7°C). When the process requires fluid temperatures below 45°F (27.2°C) it is imperative that the process fluid be a mixture of an industrial grade ethylene or propylene glycol and water to the proper percentage (by volume) to protect the system.
Refrigeration Circuit Water- and remote air-cooled refrigerant condensing differ only in the way the compressed gas is condensed to a liquid. Shown below is a water cooled version. 1 The refrigerant is compressed in the compressor and flows through the discharge line as a gas to the condenser. There it gives up its heat as it condenses to a liquid in the condenser.
is off. There is a “compressor anticyle” timer that will delay the time between compressor starts to prevent short cycling of the compressor. This is a start to start timer set at 5 minutes. For example, if the compressor has been running for 5 minutes and shuts off, then the compressor can start immediately if the demand is there. If it has only been running for 2 minutes, then it would not be able to start again for 3 minutes.
determined from a PID algorithm using a discharge pressure transducer as the process variable. The VFD or water regulating valve is controlled from the analog output to an adjustable discharge pressure setpoint. The analog output starts at the initial “discharge pressure start” % for a given time delay (discharge pressure hold). After the time delay, it will control to the discharge pressure setpoint via the PID control. There is also a setting to control the discharge pressure to the most efficient value.
• Filter-dryer • Sight glass • Modulating electronic expansion valve • Compressor crankcase heater Controller Features • Off-the-shelf microprocessor-based PID controller with To Process, From Process and Set Point readout • Time delay for proof of water flow/pressure (models w/pump only) • Low refrigerant pressure time delay for low ambient start-up on remote air-cooled and air-cooled chillers with the variable-speed fan option.
High Pressure Cutout This electro-mechanical cutout device opens the compressor control module if the refrigeration system compressor discharge pressure exceeds 575 psig. Note: The high-pressure cutout is a manual reset device typically mounted on the compressor discharge line behind the electrical enclosure. Call a refrigeration service technician to analyze the problem and reset the control.
Flow Switch The thermal dispersion flow switch cutout device, mounted in the process piping, shuts down the chiller if it senses that the water/glycol flow rate through the evaporator has dropped below an acceptable level. The flow switch opens the control module and shuts down the pump and the chiller. Remote Start/Stop Interlock An additional contact is provided to allow the remote starting or stopping of the chiller.
Communications Options*. This option provides the capability for the unit’s controller to communicate with an external device using a variety of serial communication protocols. Currently the unit can communicate over RS-485 Modbus RTU, IP Modbus, Ethernet IP Modbus RTU, RS-485 or IP BACNet, LONWorks. UL/cUL Labeled Electrical Subpanel. This option provides for the subpanel to be listed with Underwriters Laboratory, with UL-related benefits and features.
Chapter 3: 3-1 Installation Uncrating All models are shipped mounted on a skid, enclosed in a plastic wrapper, and open-crated on all four sides and top. 1. Pry the crating away from the skid. 2. Use a wrench to remove the fasteners securing the unit to the skid. 3. Lift unit from front or rear, inserting forklift under the fork pockets. The forks must be equidistant from the centerline of the unit and the unit must be balanced on the forks. Lift slowly and only high enough to clear the skid.
3-3 Process Water Connections All of our central chillers have two chilled water connections. The chilled water supply, labeled “To Process” is the outlet for the chilled water leading to the process being cooled. The chilled water return, labeled “From Process” is the inlet leading from the process back into the chiller to be cooled and re-circulated.
Note: 3-6 The use of poor quality water may result in inefficient operation, heat exchanger damage, and pump seal damage. Consult a qualified water treatment specialist to determine what type of treatment is needed. Condenser Considerations Water-Cooled Chiller Condensers Water-cooled central chillers can use city water or tower water as a cooling medium through the condenser. Make sure that all external piping and connections supplying and discharging water to and from the condenser are full size.
Remote Air-Cooled Chiller Condensers Remote air-cooled central chillers are shipped with nitrogen holding charge and a full charge of oil (excluding the amount needed for field piping). The remote air condenser is shipped with a dry nitrogen charge. Verify that the holding charge has not been lost prior to installation. If there is no pressure, leak test the unit and repair before installing the interconnecting refrigerant piping. Read this entire section before installation.
Sizing Refrigerant Lines. To determine field installed liquid and discharge line sizes, first establish the equivalent length of pipe for each line, valve, and elbow. Chiller capacity and leaving water temperature range is also required. See Figure 3 on page 20 for lengths of refrigerant valves and fittings. Liquid Line Sizing. The liquid line should be sized as small as possible while maintaining acceptable pressure drop to minimize the refrigerant charge.
Length (Ft) Length (Ft) Horizontal or Downflow Upflow 1-5 Ft Upflow 6-10 Ft Upflow 11-15 Ft Horizontal or Downflow Upflow 1-5 Ft Upflow 6-10 Ft Upflow 11-15 Ft 25 1-1/8 1-1/8 1-1/8 1-1/8 50 1-1/8 1-1/8 1-1/8 1-1/8 25 1-1/8 1-1/8 1-1/8 1-1/8 50 1-1/8 1-1/8 1-1/8 75 1-1/8 1-1/8 1-1/8 1-1/8 1-1/8 75 1-1/8 1-1/8 1-1/8 1-1/8 100 1-1/8 1-1/8 125 1-1/8 1-1/8 1-1/8 1-1/8 100 1-1/8 1-1/8 1-1/8 1-1/8 1-1/8 1-1/8 125 1-1/8 1-1/8 1-1/8 150 1-1/8 1-1/8 1-1/8
GCRC-70 GCRC-90 GCRC-105 GCRC-140 GCRC-175 GCRC-210 7/8 1-1/8 1-1/8 1-1/8 1-3/8 1-5/8 7/8 1-1/8 1-1/8 1-3/8 1-3/8 1-5/8 GC Series Central Chillers A-1/2 A-1/2 A-1/2 A-1/2 A-1/2 A-1/2 A-1/2 A-1/2 A-5/8 A-5/8 B-7/8 B-7/8 B-1-1/8 B-1-1/8 B-1-1/8 B-1-1/8 B-1-1/8 B-1-1/8 B-1-3/8 B-1-3/8 1-1/8 1-1/8 1-1/8 1-3/8 1-3/8 1-5/8 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4 B-1-1/8 B-1-1/8 B-1-1/8 B-1-1/8 B-1-1/8 B-1-1/8 B-1-1/8 B-1-1/8 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4
Refrigerant Charge Determination. The approximate amount of refrigerant charge required by the system varies based on the total length of the refrigerant lines and the size of the chiller. Referring to Figure 6, determine the amount of charge based on the model of the chiller and the amount of charge based on discharge and liquid line sizes and lengths. Add these three numbers together to find the final operating charge.
Configuration A: Discharge Line Liquid Line * Liquid line riser not exceed 15 feet from base of air-cooled condenser Configuration B: DISCHARGE LINE LIQUID LINE AB Configuration C: Discharge Line Inverted Trap Liquid Line Figure 7: Remote Condenser Configurations GC Series Central Chillers Chapter 3: Installation 24 of 79
Figure 8: Double Riser Detail 3-7 Checking Motor Direction All of our central chillers have their motor rotations properly phased at the factory. If compressors, pumps, or fans are running in reverse rotation, disconnect and lock out the power source and reverse any two power leads into the chiller disconnect switch. Caution! Do not switch leads at the motors, motor starters, or contactors. Three-Phase Compressors Scroll compressors are directionally-dependent and compress in one rotational direction.
3-8 Fluid Temperature Considerations Warning! Operating the chiller setpoint below 45°F (7°C) without the proper amount of glycol for freeze protection could result in a damaged evaporator. ACS Group does not warrant the freeze up of the evaporator under any circumstances. The standard GC central chiller has an operating range of 20°F to 80°F (-7°C to 27°C). Pure water can be used when the desired fluid temperature is 45°F (7.2°C) or greater. To operate below 45°F (7.
Figure 9: Ethylene Glycol and Propylene Glycol Curves Percent Glycol Curves for Freeze Protection 40.0 30.0 Ethylene Glycol 20.0 Propylene Glycol 10.0 0.0 -10.0 -20.0 -30.0 -40.0 -50.0 -60.0 0.0 10.0 20.0 30.0 40.0 50.0 60.0 % Glycol by Volume Example: 45°F set point minus 20°F = 25°F. From Figure 28, 25°F equates to 10% by volume of glycol required.
3-9 Initial Start-Up • Check the shipping papers against the serial tag to be sure chiller size, type and voltage is correct for the process that will be controlled. Central chillers are built with a voltage specific compressor and cannot be re-wired for an alternate voltage. • Check the transformer primary voltage connections to be sure they are configured for the electrical power you are using.
Note: If you choose to define an Operator Password you must also define a Supervisor Password to complete the security setup. Supervisor Password. If you define a password for supervisors (or setup personnel) then most settings can be changed only after entering the password. The password will be required to display the extended setpoints for operating parameters and alarms. Section 4-6 shows a table of setpoints and the restrictions between Operator and Supervisor. To set password protections: 1.
Chapter 4: 4-1 Operation Panel Buttons, Indicator Lights, and Switches Microprocessor Controller The standard chillers use a microprocessor-based PID controller. The Carel PCO controller is located in the control enclosure. The Carel PGD1 Interface is housed in a block of rigid plastic with a magnetic backing that allows the user to “stick” the interface on any metallic surface. The Standard Display for the GC70 through GC210 units come standard with a 20 ft (6 m) cable.
Button 4-2 Button Description Detailed description Menu Button Used to access the menus structure of the PGD interface On/Off Button Used to turn the entire chiller On or Off. The button is backlit and will turn amber when the chiller is On. Back Button Used to back up from a menu and return to the main status screen Up Arrow Button Used to increment a data field or scroll up within a menu structure. Enter Button Used to accept a data field value or to select a menu item.
3. Set the Leaving Fluid temperature by depressing the the menu. button to display Figure 12: Menu Screen 4. Depress the or button to highlight SETPOINTS and press . If passwords were setup (See Section 3-12 for information on the controller passwords) the password screen will appear. Enter the established Operator Password by depressing the to move the position of the cursor, and then depressing the or button to increment or decrement the number.
10. Operate the chiller, looking for any leaks and listening for unusual noises or vibrations that could indicate improper operation. Elevated sound level and substantially reduced current draw indicate reverse rotation. After several minutes of operation, the compressor internal protector trips. 4-3 PGD1 Status Screens The controller has eight (8) preconfigured status screens.
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4-4 Access Levels The controller is setup to allow access to three distinct password groups: operator, supervisor, and service. Operator access allows the user to modify the Leaving Water Temp, Hi and Low Temp Warning, Hi and Low Temp Fault setpoints. Supervisor access allows the supervisor to modify the above plus additional setpoints, installing additional modules, setup communications, and perform sensor calibration.
Variable Pump Stop Delay Heater Stop Delay Tank Min Lvl Tank Max Lvl Description Pump stop delay timer that delays the stoppage of the pump. Access Level x Delay timer before the heater can turn on. x The minimum allowable tank level, usually determined by the location of the pump suction. The low level alarms are automatically determined from this value. The maximum allowable tank level, usually determined by the height of the tank. The high level alarms are automatically determined from this value.
2. Depress the or button to highlight SETTINGS and press . If passwords were setup (See Section 3-12 for information on the controller passwords) the password screen will appear. Enter the Operator Password by depressing the to move the position of the cursor, and then depressing the or button to increment or decrement the number. Once all of the numbers have been entered depress the to accept the password. The following screen will appear. Figure 16: Operator Setpoints Screen 3.
If not configured at the purchase of the module, the communications board must be added to the controller before communications may commence. Purchase the necessary board that matches your protocol and hardware specification. Part number 744.00239.00 744.00265.00 744.00266.00 724.00887.
Chapter 5: 5-1 Maintenance Lubrication Grease all fan motors, and pump motors that do not have permanently sealed bearings. Be sure to use an all-purpose industrial grease with a temperature reference of 185˚ F (85˚ C). Remove the grease relief plug (motors only) before adding grease, add grease until a small amount pours out, and replace the plug when finished. Caution! Failure to remove the grease relief plug will result in dislodging the bearing grease seal, eventually causing bearing failure.
5-4 Maintaining the Evaporator Dirty evaporator heat exchange surfaces reduce system capacity and efficiency. Remove dirt and slime in the evaporator by reverse-circulating with a mild detergent and water solution. Remove mineral deposits by reverse-circulating Non-Acid De-Scaling Solution (Part No. 216.00017.00). Follow the directions on the container. To perform the evaporator flush 1. Close the evaporator process inlet and outlet butterfly valves. 2.
5-5 Evaporator Process Strainer The evaporatorstrainer requires periodic cleaning of its screen to insure the proper flow through the evaporator. To clean the strainer screen, 1. Close the evaporator inlet and outlet butterfly valves on the back of the unit. 2. Open the ball valves on the sensor caps to drain the evaporator. 3. Remove the clip that holds the top sensor cap to the evaporator. 4. Remove the sensor cap off the evaporator. 5. Remove the strainer out of the evaporator. 6.
5-6 Preventative Maintenance Service Follow a systematic preventive maintenance program to help avoid costly down time. Call the Service Department to arrange a schedule of inspections. This service can be tailored to fit your maintenance requirements.
Chapter 6: Troubleshooting Problem Possible cause No power. Wrong voltage supplied to unit. Defective display. Unit does not run. Control circuit fuse blown. Defective control transformer. Piping flow switch circuit open. Leaving fluid setpoint set higher than temperature of liquid in system. Compressor internal overload or fuses are open. Pump runs; compressor does not. Compressor contactor holding coil open. Defective compressor auxiliary contact. Broken wire in the compressor control circuit.
Problem Possible cause Compressor not operating efficiently. Unit under-sized for application. Solution Call service.
Controller Alarm Low Fluid Temp Fault (Leaving fluid temperature has dropped below the fault setpoint) Low Suction Pressure Fault (Suction pressure has fallen below fault setpoint) Possible Cause Optional Hot gas bypass valve malfunction Solution Verify wiring EV Connection B1-4 on EVD Refrigerant undercharge Contact refrigeration technician about adding refrigerant as needed Contact refrigeration technician about repairing lead and adding refrigerant as needed Verify wiring EV Connection A1-4 on EVD Ve
Controller Alarm High Level Warning (optional: will only become active if level sensor is enabled in Supervisor Menu) Compressor Differential Pressure Fault High Suction Pressure Warning Low Discharge Pressure Warning Low Fluid Temp Warning Low Level Warning (optional: will only become active if level sensor is enabled in Supervisor Menu) Possible Cause Fluid level in pump tank is above warning setpoint Condenser inlet temperature too low VFD fault Condenser water regulating valve open Load may be too hi
Controller Alarm Possible Cause Faulty sensor cable Faulty sensor Low Suction Pressure at Startup Solution Replace cable Replace sensor Contact ACS Group Aftermarket Service for assistance Troubleshooting the ABB Variable Speed Drive If a current alarm exists, the drive will be flashing a fault code on the LED display. Below is a table of common faults and their corrections. NOTE: If a fault code is not listed in the table below contact ACS Group Aftermarket Service at [800] 423-3183.
Code F0034 VFD Alarm MOTOR PHASE GC Series Central Chillers Possible Cause line phase or blown fuse. Fault trip occurs when DC voltage ripple exceeds 14% of nominal DC voltage. Motor circuit fault due to missing motor phase. Chapter 6: Troubleshooting Solution Check for input power supply imbalance. Check fault function parameter setting. Check motor and motor cable.
Chapter 7: 7-1 Appendix Returned Material Policy Credit Returns Prior to the return of any material, authorization must be given by the manufacturer. A RMA number will be assigned for the equipment to be returned. Reason for requesting the return must be given. All returned Material purchased from the manufacturer is subject to 15% ($75.00 minimum) restocking charge. All returns are to be shipped prepaid. The invoice number and date or purchase order number and date must be supplied.
7-2 Technical Assistance Parts Department Call toll-free Monday – Friday, 7am–5pm CST [800] 423-3183 or call [262] 641-8600, Fax [262] 641-8653 The ACS Customer Service Group will provide your company with genuine OEM quality parts manufactured to engineering design specifications, which will maximize your equipment’s performance and efficiency. To assist in expediting your phone or fax order, please have the model and serial number of your unit when you contact us.
7-3 Specifications Remote Air-Cooled Central Chillers Nominal operating parameters for remote air-cooled models are 50ºF (10ºC) leaving water temperature at 2.4 gpm per ton (9.1 lpm per 3.517 kW) with 95ºF (35ºC) ambient air. For 50 Hz applications, multiply capacity by 0.83. Nominal 60 Hz capacity flow rate must be maintained. 20 TON (GCRC-70) PERFORMANCE (NOMINAL DESIGN CONDITIONS) COOLING CAPACITY COOLANT SUPPLY TEMPERATURE 20.
25 TON (GCRC-90) PERFORMANCE (NOMINAL DESIGN CONDITIONS) COOLING CAPACITY COOLANT SUPPLY TEMPERATURE 25.47 AMBIENT AIR TEMPERATURE COOLANT TONS ALTITUDE SEA LEVEL 50 °F COMPRESSOR POWER 25504 WATTS 95 °F EER 11.98 BTU/WATT 61 GPM 7 PSID WATER COOLANT FLOW UNIT PRESSURE DROP SOUND POWER LEVEL SOUND PRESS LEVEL @ 1 METER 95 dBA dBA OPERATING PARAMETERS COOLANT SUPPLY TEMPERATURE AMBIENT AIR TEMPERATURE 20-80 °F COOLANT FLOW 60-115 °F MINIMUM LOAD 30-120 GPM 5.
30 TON (GCRC-105) PERFORMANCE (NOMINAL DESIGN CONDITIONS) COOLING CAPACITY COOLANT SUPPLY TEMPERATURE 30.21 AMBIENT AIR TEMPERATURE COOLANT TONS ALTITUDE SEA LEVEL 50 °F COMPRESSOR POWER 29731 WATTS 95 °F EER 12.19 BTU/WATT 72 GPM 7 PSID WATER COOLANT FLOW UNIT PRESSURE DROP SOUND POWER LEVEL SOUND PRESS LEVEL @ 1 METER 95 dBA dBA OPERATING PARAMETERS COOLANT SUPPLY TEMPERATURE AMBIENT AIR TEMPERATURE 20-80 °F COOLANT FLOW 60-115 °F MINIMUM LOAD 36-144 GPM 6.
40 TON (GCRC-140) PERFORMANCE (NOMINAL DESIGN CONDITIONS) COOLING CAPACITY COOLANT SUPPLY TEMPERATURE 40 TONS 50 °F COMPRESSOR POWER 38153 WATTS AMBIENT AIR TEMPERATURE 95 °F EER 12.58 BTU/WATT 96 GPM 7 PSID COOLANT ALTITUDE SEA LEVEL WATER COOLANT FLOW UNIT PRESSURE DROP SOUND POWER LEVEL SOUND PRESS LEVEL @ 1 METER 98 dBA dBA OPERATING PARAMETERS COOLANT SUPPLY TEMPERATURE AMBIENT AIR TEMPERATURE 20-80 °F COOLANT FLOW 60-115 °F MINIMUM LOAD 48-192 GPM 8.
50 TON (GCRC-175) COOLING CAPACITY COOLANT SUPPLY TEMPERATURE 49.41 ALTITUDE SEA LEVEL 50 °F COMPRESSOR POWER 48693 WATTS 95 °F EER 12.18 BTU/WATT 118 GPM 7 PSID AMBIENT AIR TEMPERATURE COOLANT TONS WATER COOLANT FLOW UNIT PRESSURE DROP SOUND POWER LEVEL SOUND PRESS LEVEL @ 1 METER 98 dBA dBA OPERATING PARAMETERS COOLANT SUPPLY TEMPERATURE AMBIENT AIR TEMPERATURE 20-80 °F COOLANT FLOW 60-115 °F MINIMUM LOAD 60-240 GPM 9.
60 TON (GCRC-210) PERFORMANCE (NOMINAL DESIGN CONDITIONS) COOLING CAPACITY COOLANT SUPPLY TEMPERATURE 63.95 ALTITUDE SEA LEVEL 50 °F COMPRESSOR POWER 63589 WATTS 95 °F EER 12.07 BTU/WATT 153 GPM 7 PSID AMBIENT AIR TEMPERATURE COOLANT TONS WATER COOLANT FLOW UNIT PRESSURE DROP SOUND POWER LEVEL SOUND PRESS LEVEL @ 1 METER 99 dBA dBA OPERATING PARAMETERS COOLANT SUPPLY TEMPERATURE AMBIENT AIR TEMPERATURE 20-80 °F COOLANT FLOW 60-115 °F MINIMUM LOAD 72-288 GPM 12.
Water-Cooled Central Chillers Nominal operating parameters for water-cooled models are 50ºF (10ºC) leaving water temperature at 2.4 gpm per ton (9.1 lpm per 3.517 kW) with 85ºF (29ºC) tower water. For 50 Hz applications, multiply capacity by 0.83. Nominal 60 Hz capacity flow rate must be maintained. 20 TON (GCWC-70) PERFORMANCE (NOMINAL DESIGN CONDITIONS) COOLING CAPACITY COOLANT SUPPLY TEMPERATURE CONDENSER INLET WATER TEMP COOLANT 22.
25 TON (GCWC-90) PERFORMANCE (NOMINAL DESIGN CONDITIONS) COOLING CAPACITY COOLANT SUPPLY TEMPERATURE CONDENSER INLET WATER TEMP COOLANT 28.43 TONS UNIT PRESSURE DROP SEA LEVEL 50 °F COMPRESSOR POWER 21716 WATTS 85 °F EER 15.
40 TON (GCWC-140) PERFORMANCE (NOMINAL DESIGN CONDITIONS) COOLING CAPACITY COOLANT SUPPLY TEMPERATURE CONDENSER INLET WATER TEMP COOLANT 43.35 TONS °F COMPRESSOR POWER 32685 WATTS 85 °F EER 15.
60 TON (GCWC-210) PERFORMANCE (NOMINAL DESIGN CONDITIONS) COOLING CAPACITY COOLANT SUPPLY TEMPERATURE CONDENSER INLET WATER TEMP COOLANT 70.63 TONS °F COMPRESSOR POWER 54315 WATTS 85 °F EER 15.
7-4 Flow and Pressure Considerations Pure Water at >40°F (4.4°C) GCXC-70 1.7 GCXC-90 30 1.8 GCXC-140 36 1.7 GCXC-175 0.5X Nominal 24 48 1.8 1.0X Nominal 48 6.1 60 6.5 72 6.1 96 6.4 2.0X Nominal 96 21.9 120 23.5 144 22.1 192 23.6 0.5X Nominal 72 1.0X Nominal 144 6.2 2.0X Nominal 288 22.7 GCXC-210 1.7 Calculating Chiller Nominal Flow and Pressure to Process • Flow rate: Obtain the flow reading from the appropriate pump curve.
7-5 Remote Air-Cooled Chiller Configurations Configuration A: Discharge Line Liquid Line * Liquid line riser not exceed 15 feet from base of air-cooled condenser Configuration B: DISCHARGE LINE LIQUID LINE AB Configuration C: Discharge Line Inverted Trap Liquid Line GC Series Central Chillers Chapter 7: Appendix 65 of 79
Figure 17: Double Riser Detail GC Series Central Chillers Chapter 7: Appendix 66 of 79
7-6 Piping Diagrams GC Series Central Chillers Chapter 7: Appendix 67 of 79
GC Series Central Chillers Chapter 7: Appendix 68 of 79
GC Series Central Chillers Chapter 7: Appendix 69 of 79
GC Series Central Chillers Chapter 7: Appendix 70 of 79
GC Series Central Chillers Chapter 7: Appendix 71 of 79
GC Series Central Chillers Chapter 7: Appendix 72 of 79
GC Series Central Chillers Chapter 7: Appendix 73 of 79
GC Series Central Chillers Chapter 7: Appendix 74 of 79
GC Series Central Chillers Chapter 7: Appendix 75 of 79
GC Series Central Chillers Chapter 7: Appendix 76 of 79
GC Series Central Chillers Chapter 7: Appendix 77 of 79
GC Series Central Chillers Chapter 7: Appendix 78 of 79
Index Appendix Flow and Pressure Considerations ........... 64 Piping Diagrams ........................................... 67 Remote Air-Cooled Chiller Configurations .................................................................. 65 Returned Material Policy .......................... 52 Specifications Remote Air-Cooled Central Chillers ...... 54 Water-Cooled Central Chillers ............... 60 Technical Assistance ..................................
