Bryant 607C-A Pressure Switches, Loss of Charge Switch, High-Pressure Switch, Refrigerant System

Page 25

C99097

Fig. 20 - Refrigerant Circuit

Control

Blower Access

Access Panel

Compressor Panel

Access Panel

A09214

Fig. 21 - Unit Access Panels

Step 8 — Pressure Switches

Pressure switches are protective devices wired into control circuit (low voltage). They shut off compressor if abnormally high or low pressures are present in the refrigeration circuit. These pressure switches are specifically designed to operate with Puron (R-410A) systems. R-22 pressure switches must not be used as replacements for the Puron (R-410A) system.

Step 9 — Loss of Charge Switch

This switch is located on the liquid line and protects against low suction pressures caused by such events as loss of charge, low airflow across indoor coil, dirty filters, etc. It opens on a pressure drop at about 20 psig. If system pressure is above this, switch should be closed. 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.

NOTE: Because these switches are attached to refrigeration system under pressure, it is not advisable to remove this device for troubleshooting unless you are reasonably certain that a problem exists. If switch must be removed, remove and recover all system charge so that pressure gauges read 0 psi. Never open system without breaking vacuum with dry nitrogen.

Step 10 — 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.

Step 11 — 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.

!WARNING

EXPLOSION HAZARD

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

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

Step 12 — Refrigerant System

This step covers the refrigerant system of the 607--A, including the compressor oil needed, servicing systems on roofs containing synthetic materials, the filter drier and refrigerant charging.

Refrigerant

!WARNING

PROPERTY HAZARD, PERSONAL INJURY OR ENVIRONMENTAL HAZARD

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

This system uses Puron (R-410A) refrigerant which has higher operating pressures than R-22 and other refrigerants. No other refrigerant may be used in this system. Gauge set, hoses, and recovery system must be designed to handle Puron. If you are unsure consult the equipment manufacturer.

607C-- -- A

25

Page 24 Page 26
Image 25
Page 24 Page 26
Contents Safety Considerations Table of ContentsIntroduction Receiving and InstallationCheck Equipment Provide Unit Support607--A24-30 Unit Dimensions 607--A36-60 Unit Dimensions SMALL/COMMON Curb Inspection Rig and Place UnitRigging/Lifting of Unit See Fig Unit Falling HazardPersonal Injury and Electrical Operation Hazard Select and Install DuctworkProvide for Condensate Disposal Install Electrical ConnectionsHigh-Voltage Connections Unit Component Damage HazardSpecial Procedures for 208-V Operation Accessory Electric Heaters InstallationStandard Connections Transformer ProtectionMinimum Airflow for Reliable Electric Heater Operation CFM Condensate Trap Physical Data Unit 607--AConnection Wiring Schematics 208/230-1-60 Cont. Ladder Wiring Schematics 208/230-1-60 607C a Cont. Ladder Wiring Schematics 208/230-3-60 Connection Wiring Diagram Cont. Ladder Wiring Diagram START-UP Start-Up AdjustmentsCheck for Refrigerant Leaks Checking Cooling and Heating Control OperationIndoor Airflow and Airflow Adjustments Checking and Adjusting Refrigerant ChargeTwo Cooling Fan Speeds Set-up Dehumidification feature used Unit Operation HazardContinuous Fan Operation Single Speed Cooling With Higher Electric Heat SpeedColor Coding for Indoor Fan Motor Leads Quiet Shift Defrost ControlDefrost Air Filter MaintenanceIndoor Blower and Motor Personal Injury and Unit Damage HazardFilter Pressure Drop Table in. W.C 607--A Wet Coil Pressure Drop in. W.CCooling Charging Table-Subcooling Outdoor Coil, Indoor Coil, and Condensate Drain PanOutdoor Fan Electrical Controls and WiringRefrigerant Circuit Indoor AirflowLoss of Charge Switch Pressure SwitchesHigh-Pressure Switch Copeland Scroll Compressor Puron RefrigerantSTART-UP Checklist TroubleshootingSystem Information Puronr R-410A Quick Reference Guide Symptom Cause Remedy Troubleshooting ChartRemove and Store in Job Files TemperaturesPreliminary Information Model no III. START-UP Electrical Supply Voltage Compressor AmpsAccessories Vertical Economizer Factory Installed Option GeneralInstallation Small ChassisFilter Part Number Economizer Hood Top Panel RemovalHood Divider Removed Economizer Hood Assembly Horizontal Return Duct Cover Panel and Hood Divider Removal Large ChassisLeft Hood Side Hood Assembly Supply AIR Temperature SAT SENSOR-The supply ConfigurationEconomizer Standard Sensors 11.7C 12.8C 14.4C 17.2C 20C 22.8C 25.6C Economizer Controller 607C-- -- a Economizer Wiring Diagram A10200 Cont. Ladder Wiring Diagram A10199 607C-- -- a 607C-- -- a CO2 Sensor Standard Settings Economizer Input/Output Logic CO2 Sensor Standard SettingsOperation Troubleshooting 607C--A 30 3 Phase with Economizer 607C--A 36-60 3 Phase with Economizer
Top Page Image Contents