Takeuchi TB175W, Руководство по ремонту

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III-76 TB175W
1. Purging Air From Gauge Set Hoses
Environmental regulations require that all service hoses have a shutoff valve
within 12 inches of the service end. These valves are required to ensure only
a minimal amount of refrigerant is lost to the atmosphere. R-12 gauge set
hoses have a valve near the end of all three hoses. R-134a gauge sets have a
combination quick disconnect and shutoff valve on the high and low sides.
The utility (center) hose also requires a valve.
The initial purging is best accomplished when connected to recovery or
recycle equipment. Figure 8-3 illustrates the gauge set connections for purg -
ing and refrigeration recovery.
Note:
The manifold gauges read system pressure when the hand
valves are closed if the hose end valves, and the stem type
service valves (if included) are open.
2. Adding Refrigerant to the System
Now that the gauges are connected, you may need to add some refrigerant to
the AC system before you can do an effective performance inspection. How-
ever, if leaks are obvious they should be repaired prior to adding refrigerant.
Note: Loss of some refrigerant is not unusual over an extended pe-
riod of time. Adding refrigerant is a typical procedure when
the AC system is maintained on a regular basis.
When adding refrigerant to the system, connect the center hose from the
manifold gauge set to the refrigerant dispensing valve on the container. Fig-
ure 8-4 illustrates this connection.
Manifold Gauge Set Installation
Figure 8-3
The purging setup for mani-
fold gauge set and compres-
sor service valves are shown
here.