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STEP 5 - Replace the pressure tap valve cores
and plastic tabs after the service valves have
cooled.
Section 8. Refrigerant Line Leak Check
8.1 Check For Leaks
After completion of field piping for split systems, the field pipework shall be pressure tested with an inert gas and
then vacuum tested prior to refrigerant charging, according to the following requirements:
1. The minimum test pressure for the low side of the system shall be the low side design pressure and the
minimum test pressure for the high side of the system shall be the high side design pressure, unless the
high side of the system, cannot be isolated from the low side of the system in which case the entire system
shall be pressure tested to the low side design pressure.
2. The test pressure after removal of pressure source shall be maintained for at least 1 hour with no decrease of
pressure indicated by the test gauge, with test gauge resolution not exceeding 5% of the test pressure.
Important: Under no circumstances shall potential sources of ignition be used in the searching for or detection of
refrigerant leaks.
Important: The following leak detection methods are deemed acceptable for all refrigerant systems:
•
Electronic leak detectors calibrated for R454B
•
Bubble method
STEP 1 - Pressurize the refrigerant lines and
evaporator coil to 150 PSIG using dry nitrogen.
STEP 2 - Check for leaks by using a soapy solu-
tion or bubbles at each brazed location.
Note: Remove nitrogen pressure and repair any
leaks before continuing.
STEP 3 - Once the initial leak check is complete, complete a system pressure test. Pressurize the system to the
design pressure of the system for a minimum of 60 minutes. Do not add additional refrigerant or test gas after
reaching the design pressure. The system should show no loss of pressure once pressurized. Once the pressure
test is complete follow the steps for evacuation.
18-AC127D1-1A-EN
150 PSIG
9
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