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Bryant 677C--A High-PressureSwitch, Copeland Scroll Compressor Puron Refrigerant, 677C-- --A

Models: 677C--A

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High-Pressure Switch

High-Pressure Switch

The high-pressure switch is located in the discharge line and protects against excessive condenser coil pressure. It opens at 650 psig.

High pressure may be caused by a dirty outdoor coil, failed fan motor, or outdoor air recirculation. To check switch:

1.Turn off all power to unit.

2.Disconnect leads on switch.

3.Apply ohm meter leads across switch. You should have continuity on a good switch.

Copeland Scroll Compressor (Puron Refrigerant)

The compressor used in this product is specifically designed to operate with Puron (R-410A) refrigerant and cannot be interchanged.

The compressor is an electrical (as well as mechanical) device. Exercise extreme caution when working near compressors. Power should be shut off, if possible, for most troubleshooting techniques. Refrigerants present additional safety hazards.

!WARNING

EXPLOSION HAZARD

Failure to follow this warning could result in personal injury or death and/or property damage.

Wear safety glasses and gloves when handling refrigerants. Keep torches and other ignition sources away from refrigerants and oils.

The scroll compressor pumps refrigerant throughout the system by the interaction of a stationary and an orbiting scroll. The scroll compressor has no dynamic suction or discharge valves, and it is more tolerant of stresses caused by debris, liquid slugging, and flooded starts. The compressor is equipped with an internal pressure relief port. The pressure relief port is a safety device, designed to protect against extreme high pressure. The relief port has an operating range between 550 and 625 psi differential pressure.

677C-- -- A

C99097

Fig. 24 - Refrigerant Circuit

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Image 31

Bryant 677C--A High-PressureSwitch, Copeland Scroll Compressor Puron Refrigerant, Explosion Hazard, Refrigerant Circuit

Contents

Installation Instructions TABLE OF CONTENTSSAFETY CONSIDERATIONS Fig. 1 - Unit 677C--AStep 2 - Provide Unit Support RECEIVING AND INSTALLATIONINTRODUCTION Step 1 - Check Equipment677C-- --A Fig. 2 - 677C--A24-30Unit DimensionsA09146 677C-- --A Fig. 3 - 677C--A36-60Unit DimensionsA09147 ROOF CURB DETAIL Fig. 4 - Roof Curb Dimensions677C SMALL CURBRigging/Lifting of Unit See Fig ACCESS PANELS MUST BE IN PLACE WHEN RIGGINGStep 5 - Rig and Place Unit InspectionFig. 6 - Condensate Trap Step 7 - Install Flue HoodStep 8 - Install Gas Piping Step 6 - Connect Condensate DrainFIRE OR EXPLOSION HAZARD Step 9 - Install Duct ConnectionsConfiguring Units for Downflow Vertical Discharge Fig. 7 - Sediment TrapTable 1 - Physical Data - Unit 677C Fig. 8 - Supply and Return Duct Opening677C-- --A Horizontal Duct Covers677C-- --A Table 1 - Physical Data - Unit 677C--ACont’dTable 2 - Maximum Gas Flow Capacity Table 3 - Heating InputsControl Voltage Connections Step 10 - Install Electrical ConnectionsSpecial Procedures for 208-VOperation High-VoltageConnectionsThermostat Balance Point Setting-Thermidistator HybridPRE-START-UP Transformer ProtectionStep 2 - Unit Sequence of Operation Step 3 - Start-upHeating and Make Adjust- mentsSTART-UP Step 1 - Check for Refrigerant LeaksCheck Gas Input Adjust Gas InputFig. 11 - Burner Assembly Check Heating ControlNormal Operation Airflow and Temperature RiseLimit Switches Check Burner FlameIndoor Airflow and Airflow Adjustments Step 4 - Start-upCooling and Make Adjust- mentsRollout Switch Checking and Adjusting Refrigerant Charge677C-- --A Gas Heating Fan Speed Set-upContinuous Fan Operation Table 6 - Color Coding for Indoor Fan Motor LeadsTable 7 - Filter Pressure Drop Table IN. W.C Fig. 14 - Interface Fan Board IFBTable 8 - 677C--AWet Coil Pressure Drop 677C-- --AUNIT 677C-- --AHeating 677C-- --A1295 677C-- --A1445 677C-- --A1448 677C-- --AA09068 677C AA09209 677C-- --AA09099 Fig. 17 - Cooling Charging Table-Subcooling677C-- --A 50VT500173 REVIndoor Blower and Motor MAINTENANCECleaning the Blower Motor and Wheel Air FilterFig. 19 - Unit Access Panels Limit SwitchInduced Draft combustion air Blower Assembly Fig. 18 - Blower Housing and Flue Collector BoxFig. 20 - Removal of Motor and Blower Wheel Electrical Controls and WiringOutdoor Fan Refrigerant CircuitPage Fig. 24 - Refrigerant Circuit High-PressureSwitchCopeland Scroll Compressor Puron Refrigerant EXPLOSION HAZARD677C-- --A UNIT OPERATION AND SAFETY HAZARDRefrigerant System Compressor OilLiquid Line Filter Drier TROUBLESHOOTINGSTART-UPCHECKLIST Synthetic Roof Precautionary Procedure677C-- --A SYMPTOMTable 13 - Troubleshooting Guide-LEDStatus Codes Table 12 - Troubleshooting Guide-Heating677C-- --A PRESSURES TEMPERATURESRemove and Store in Job Files I. PRELIMINARY INFORMATION MODEL NO