Bard QW3S1, QW4S1, QW5S1, QW2S1 installation instructions Service, Unbrazing System Components

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SERVICE

UNBRAZING SYSTEM COMPONENTS

If the refrigerant charge is removed from a scroll equipped unit by bleeding the high side only, it is sometimes possible for the scrolls to seal, preventing pressure equalization through the compressor. This may leave low side shell and suction line tubing pressurized. If the brazing torch is then applied to the low side while the low side shell and suction line contains pressure, the pressurized refrigerant and oil mixture could ignite when it escapes and contacts the brazing flame. To prevent this occurrence, it is important to check both the high and low side with manifold gauges before unbrazing.

WARNING

Both the high and low side of the scroll compressor must be checked with manifold gauges before unbrazing system components. Failure to do so could cause pressurized refrigerant and oil mixture to ignite if it escapes and contacts the brazing flame causing property damage, bodily harm or death.

Manual

2100-532B

Page

41 of 46

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Contents Bryan, Ohio QW2S1 QW3S1 QW4S1 QW5S1Contents Figures For More INFORMATION, Contact These Publishers Getting Other Information and PublicationsQW Model Nomenclature Electrical SpecificationsUnit Dimensions Unit Removal from Skid Shipping DamageHandling Unit After Removal from Skid Removal of Unit from SkidProper Handling of Unit After Removal from Skid Minimum Installation HeightGeneral Installation of Unit Through Wall with Wall Sleeve Ducted Application Installation with Free Blow PlenumFilters Duct WorkCondensate Drain Supply Duct ConnectionsOptional Rear Drain Condensate DrainCommercial Room Ventilator Option Rear Drain TOP ViewRemoval of the Q-TEC Energy Recovery Ventilator TEC Energy Recovery Ventilator OptionRemoving Locking Screws from Wheels Installation InstructionsMounting the Unit Unit Mounting Without Ventilation Wall Sleeve Component Location Wiring LOW Voltage Wiring Wiring Main PowerOperating Voltage Range Wall ThermostatsLOW Voltage Connections for DDC Control Blower Motor LOW Voltage Wire Harness PlugLOW Voltage Connections 24VAC Remote Thermostat Wiring Diagram OptionRemote Thermostat Wiring Diagram Thermostat Option Plug #1 Start UP AdjustmentsDescription of Standard Equipment Compressor Control ModuleImportant Installer Note Optional CFM Service HintsPhase Monitor Delay on Make TimingIndoor Blower Performance Pressure Service PortsPiping Access to Unit Fluid Connections on Unit with Ventilation Wall Sleeve Opening Rear of Unit Fluid Access From FloorFluid Connections on Unit Without Ventilation Wall Sleeve Flow Rate for Various Fluids Pressure TableOptional Accessories Circulation System Circulation System DesignCopper Water Coil Application Water Temperature and Pressure Procedure Start UP Procedure for Closed Loop SystemPerformance Model DORFC-2 Loop Pump Module Performance Model DORFC-1 Loop Pump ModuleConstant Flow Valves Piping DiagramWater Connections Well Pump Sizing System Start UP Procedure for Open Loop ApplicationsWater Corrosion Remedies of Water ProblemsCleaning Water Coil Lake and Pond InstallationsWater Well System Water Flow and Pressure Drop Cooling Tower / Boiler ApplicationWater Source Heat Pump Water Source Heat Pump Unbrazing System Components ServiceDon’t Troubleshooting GE ECM MotorsReplacing ECM Control Module Troubleshooting GE ECM Motors CONT’DCommon Cause Occasional Cause Denotes Ground Source Heat Pump Performance Report Following Information is Needed To Check Performance of Unit