Restricted Capillary Tube; Access Valves - Viking VUWC244DRSS Service Manual

3.8

Restricted Capillary Tube

Moisture and other contaminants that enter the system can cause deposits in the system. These deposits
will usually collect in the capillary tube and form a restriction that can not be completely removed by
flushing. If the capillary tube is restricted the filter / drier, capillary tube, evaporator, and suction line as-
sembly should be replaced.
3.9

Access Valves

A temporary access valve can be used to diagnosis and service the system. To access the low side of the
system, install the access valve on the process tube at the compressor. Do not install the access valve
near the base of the compressor leave some room on the process tube in case the unit has to be serviced
again. Before piercing the process tube, install the low side hose from your manifold gage to the access
valve. Once the valve has been pierced, slightly crack the hose fitting at the manifold long enough to
bleed the air from line. When service has been completed the access valve should be removed. This will
prevent future leaking as these valves are not guaranteed leak proof. To remove the valve, use a pinch
off tool to close the process tube between the valve and the compressor. With the pinch off tool in place,
remove the valve and solder the pierced hole shut. At this time remove the pinch off tool and check for
leaks with the system off.
2010 - Viking Preferred Service
17
SMR-0005