Bryant 677C--A Troubleshooting, START-UP Checklist, Puronr R-410A Quick Reference Guide

Page 33

replacing refrigerant components such as filter drier, pressure switch, metering device, coil, accumulator, or reversing valve.

Synthetic Roof Precautionary Procedure

1.Cover extended roof working area with an impermeable polyethylene (plastic) drip cloth or tarp. Cover an approximate 10x10 ft (3x3 m) area.

2.Cover area in front of the unit service panel with a terry cloth shop towel to absorb lubricant spills and prevent run-offs, and protect drop cloth from tears caused by tools or components.

3.Place terry cloth shop towel inside unit immediately under component(s) to be serviced and prevent lubricant run-offs through the louvered openings in the unit base.

4.Perform required service.

5.Remove and dispose of any oil contaminated material per local codes.

Liquid Line Filter Drier

This filter drier is specifically designed to operate with Puron. Use only factory-authorized components. Filter drier must be replaced

PURONR (R-410A) QUICK REFERENCE GUIDE

whenever the refrigerant system is opened. When removing a filter drier, use a tubing cutter to cut the drier from the system. Do not unsweat a filter drier from the system. Heat from unsweating will release moisture and contaminants from drier into system.

Puron (R-410A) Refrigerant Charging

Refer to unit information plate and charging chart. Some R-410A refrigerant cylinders contain a dip tube to allow liquid refrigerant to flow from cylinder in upright position. For cylinders equipped with a dip tube, charge Puron units with cylinder in upright position and a commercial metering device in manifold hose. Charge refrigerant into suction-line.

TROUBLESHOOTING

Use the Troubleshooting Guides (See Tables 10-12) if problems occur with these units.

START-UP CHECKLIST

Use Start-Up checklist to ensure proper start-up procedures are followed.

677C-- -- A

SPuron refrigerant operates at 50-70 percent higher pressures than R-22. Be sure that servicing equipment and replacement

components are designed to operate with Puron

SPuron refrigerant cylinders are rose colored.

SRecovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.

SPuron systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when charging into suction line with compressor operating

SManifold sets should be minimum 700 psig high side and 180 psig low side with 550 psig low-side retard. S Use hoses with minimum 700 psig service pressure rating.

S Leak detectors should be designed to detect HFC refrigerant. S Puron, as with other HFCs, is only compatible with POE oils. S Vacuum pumps will not remove moisture from oil.

S Do not use liquid-line filter driers with rated working pressures less than 600 psig. S Do not leave Puron suction line filter driers in line longer than 72 hrs.

S Do not install a suction-line filter drier in liquid line.

S POE oils absorb moisture rapidly. Do not expose oil to atmosphere. S POE oils may cause damage to certain plastics and roofing materials. S Wrap all filter driers and service valves with wet cloth when brazing. S A factory approved liquid-line filter drier is required on every unit.

S Do NOT use an R-22 TXV.

S Never open system to atmosphere while it is under a vacuum.

S When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter driers. Evacuate to 500 microns prior to recharging.

S Do not vent Puron into the atmosphere.

S Observe all warnings, cautions, and bold text.

S All indoor coils must be installed with a hard shutoff Puron TXV metering device.

33

Image 33
Contents Safety Considerations Table of ContentsIntroduction Receiving and Installation677C--A24-30 Unit Dimensions 677C--A36-60 Unit Dimensions CPRFCURB010A00 Unit SizeCPRFCURB011A00 CPRFCURB012A00Rig and Place Unit InspectionRigging/Lifting of Unit See Fig Install Gas Piping Install Flue HoodConnect Condensate Drain Carbon Monoxide Poisoning HazardInstall Duct Connections Configuring Units for Downflow Vertical DischargeFire or Explosion Hazard Refrigerant Metering CompressorsCFM Furnace SectionPhysical Data Unit 677C--A Cont’d Maximum Gas Flow CapacityHeating Inputs Special Procedures for 208-V Operation Install Electrical ConnectionsHigh-Voltage Connections Control Voltage ConnectionsPRE-START-UP Balance Point Setting-Thermidistat or Hybrid ThermostatTransformer Protection FIRE, EXPLOSION, Electrical Shock HazardSTART-UP Start-up Heating and Make Adjust- mentsCheck for Refrigerant Leaks Unit Sequence of OperationCheck Heating Control Adjust Gas InputCheck Gas Input Unit Damage HazardLimit Switches Airflow and Temperature RiseCheck Burner Flame Normal OperationRollout Switch Start-up Cooling and Make Adjust- mentsChecking and Adjusting Refrigerant Charge Indoor Airflow and Airflow AdjustmentsGas Heating Fan Speed Set-up Two Cooling Fan Speeds Set-up Dehumidification feature usedContinuous Fan Operation Color Coding for Indoor Fan Motor LeadsFilter Size CFM 677C--A Wet Coil Pressure DropRise Speed Color Range Unit Heating Motor Wire1505 1452 1413 1358 1323 1282 1234 1169 1130 25 55oF Heating 1962 1915 1880 1843 1794 1753 1711 1675 1628 35 65oF Heating 1962 1915 1880 1843 1794 1753 1711 1675 1628 30 60oF Heating 1887 1847 1783 1726 1677 1625 1578 1527 1432 30 60oF Heating 677C a 208/230-3-60 Wiring Diagram, Unit 677C--A Cooling Charging Table-Subcooling Cleaning the Blower Motor and Wheel MaintenanceAir Filter Indoor Blower and MotorInduced Draft combustion air Blower Assembly Limit SwitchBurner Ignition Flue Gas PassagewaysOutdoor Fan Electrical Controls and WiringRefrigerant Circuit EXPLOSION, Personal Injury and Environmental HazardLoss of Charge Switch Pressure SwitchesGas Input Indoor AirflowHigh-Pressure Switch Copeland Scroll Compressor Puron RefrigerantExplosion Hazard Refrigerant System Unit Operation and Safety HazardCompressor Oil Servicing Systems on Roofs and with Synthetic materialsTroubleshooting START-UP ChecklistPuronr R-410A Quick Reference Guide Symptom Cause Remedy Troubleshooting Guide Cooling or Heat Pump Heating ModeTroubleshooting Guide-Heating Troubleshooting Guide-LED Status CodesLED OFF Remove and Store in Job Files TemperaturesPreliminary Information Model no III. START-UP Electrical Supply Voltage Compressor Amps