108
PB
R-410A SEALED SYSTEM REPAIR
Restricted Refrigerant System
Troubleshooting a restricted refrigerant system can be difficult. The following procedures are the more common problems and
solutions to these problems. There are two types of refrigerant restrictions: Partial restrictions and complete restrictions.
A partial restriction allows some of the refrigerant to circulate through the system.
With a complete restriction there is no circulation of refrigerant in the system.
Restricted refrigerant systems display the same symptoms as a “low‑charge condition.”
When the unit is shut off, the gauges may equalize very slowly.
A quick check for either condition begins at the evaporator. With a partial restriction, there may be gurgling sounds at the metering
device entrance to the evaporator. The evaporator in a partial restriction could be partially frosted or have an ice ball close to the
entrance of the metering device. Frost may continue on the suction line back to the compressor.
Often a partial restriction of any type can be found by feel, as there is a temperature difference from one side of the restriction to the
other.
With a complete restriction, there will be no sound at the metering device entrance. An amperage check of the compressor with a
partial restriction may show normal current when compared to the unit specifi cation. With a complete restriction the current drawn
may be considerably less than normal, as the compressor is running in a deep vacuum (no load.) Much of the area of the condenser will
be relatively cool since most or all of the liquid refrigerant will be stored there.
The following conditions are based primarily on a system in the cooling mode.
Figure 503(Restricted System)
Summary of Contents for VRP12K
Page 46: ...46 OPERATION Component Identification Indoor Coil 36k ...
Page 48: ...48 OPERATION Component Identification Outdoor Coil Monitored by 1 thermistor ...
Page 49: ...49 OPERATION Component Identification Outdoor Fan BLDC Variable Speed 600 1000 RPM ...
Page 53: ...53 OPERATION Component Identification 4 Way Reversing Valve 208 230v Reversing valve assembly ...
Page 177: ...177 UPDATING VRP FIRMWARE Or ...
Page 184: ...184 UPDATING VRP FIRMWARE Open zip file Copy to SD Card Insert into SD Card Slot ...
Page 193: ...193 UPDATING VRP FIRMWARE Retrieving VRP Data Remove SD Card from FMC and Locate DF Folder ...
Page 196: ...196 WIRINGDIAGRAMS 12 24K BTU 208 230V 7 5 10 0 KW Figure 801 Wiring Diagram ...
Page 197: ...197 WIRING DIAGRAMS 12 24K BTU 208 230V 2 5 3 4 5 0 KW Figure 802 Wiring Diagram ...
Page 198: ...198 WIRING DIAGRAMS 12 24K BTU 265V 2 5 3 4 5 0 kW Figure 803 Wiring Diagram ...
Page 199: ...199 WIRING DIAGRAMS 12 24K BTU 265V 7 5 10 kW Figure 804 Wiring Diagram ...
Page 200: ...200 WIRING DIAGRAMS 36K BTU 208 230V Figure 805 Wiring Diagram ...