Maintenance
Renewal parts
Order all replacement parts at http://www.hvacnavigator.com. See Figure 10.
Figure 10: Parts navigator
Checking system for leaks
Leak testing
The refrigerant side of the system is carefully pressure tested and evacuated at the factory.
After the system has been charged, use a leak detector that is compatible with the refrigerant to
ensure that that all of the joints are tight.
If any leaks are indicated, repair them immediately. At times, you can stop leaks by ensuring that
face seal nuts and flange bolts are correctly torqued. However, for any major repair, the refrigerant
charge must be removed and the system leak checked using reliable methods like a pressure test.
See Handling refrigerant for dismantling and repairs for more details.
Leak testing during operation
After the system has been charged, the system should be carefully leak tested with a compatible
leak detector to be sure that all joints are tight. The acceptable limit for a 100% pure R 134a system
is 0.1 oz/Yr at DWP.
If any leaks are indicated, they must be repaired immediately. Usually, leaks can be stopped by
tightening flare nuts or flange bolts. However, for any major repair, the refrigerant charge must be
removed.
Conducting a system pressure test
With the refrigerant charge removed and all known leaks repaired, charge the system with a small
amount of refrigerant mixed with dry nitrogen. You can then use an electronic leak detector to
detect any leaks too small to be found by the soap test.
WARNING
Care must be taken not to exceed the rated pressure of the unit refrigerant pressure relief valves.
Model YK (Style H), R-134a and R-513A28
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