191VAN Evolution™ Extreme Variable Speed Air Conditioner: Installation Instructions
Puron Advance™ (R-454B) Refrigerant - Quick Reference Guide
Be sure that servicing equipment and replacement components are designed to operate with R-454B refrigerant.
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Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT 4BW400.
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R-454B refrigerant systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when
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charging into suction line with compressor operating.
S Leak detectors should be designed to detect R-454B refrigerant.
S R-454B refrigerant is compatible with POE and PVE oils only.
S Vacuum pumps will not remove moisture from oil.
Do not use liquid -line filter driers with rated working pressures less than 600 psig.
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Do not leave R-454B suction line filter driers in line longer than 72 hours.
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S Do not install a suction -line filter drier in liquid line.
S POE and PVE oils absorb moisture rapidly. Do not expose oil to atmosphere.
POE and PVE oils may cause damage to certain plastics and roofing materials.
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Wrap all filter driers and service valves with wet cloth when brazing.
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A factory approved liquid -line filter drier is required on every unit.
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S Do NOT use R -410A TXV. TXVs are not cross compatible between R-410A and R-454B.
Do NOT convert a coil with a piston or R-410A metering device. Coils must come from the factory with an R-454B TXV and an A2L
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dissipation board already installed. Indoor unit is equipped with an R -410A TXV, it must be changed to a hard shutoff R-454B TXV.
S Never open system to atmosphere while it is under a vacuum.
When system must be opened for service, recover refrigerant, evacuate then break vacuum with an inert gas and replace filter driers. Evacuate
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to 500 microns prior to recharging.
S Do not vent R-454B refrigerant into the atmosphere.
S Do not use capillary tube coils.
S Observe all warnings, cautions, and bold text.
All indoor coils must be installed with a hard shutoff R-454B TXV metering device in long line applications.
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Edition Date: 08/24
22
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Catalog No:II191VAN-01
Replaces:New
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