40
18-GJ96D1-1B-EN
Important: Heat Sensitive Sensor. The temperature Sensor must be
removed or a wet rag must be wrapped around the
suction line between the Sensor and the braze joint to
protect the Sensor from failure due to overheating.
5. Braze refrigerant line connections.
a. Pull back the insulation before brazing the suction line.
b. Wrap the Gas Temperature Sensor (GT) with a wet rag.
c. Braze the refrigerant line connections.
Note: If system is installed in downflow, refrigerant sensor must be
relocated after brazing. See sectionHorizontal Sensor
Relocation on page 28.
Important: Care must be taken during brazing to avoid damage to
unit components and wiring.
Note: The suction line must be insulated prior to brazing the line set
to the air handler stubs.
Wet rag on TXV sensing bulb
6. Using dry nitrogen, pressurize the field piping and indoor coil to
the lower of the maximum operating pressures listed on the name
plates of the indoor and outdoor units (likely 600 psi).
7. The test pressure after removal of the pressure source shall be
maintained for at least one (1) hour with no decrease of pressure
indicated by the test gauge, with the test gauge resolution not
exceeding 30 psi.
8. Check for leaks by using a soapy solution or bubbles at each
brazed location.
Note: Remove nitrogen pressure and repair any leaks before
continuing.
RReeffrriiggeerraanntt LLiinnee BBrraazziinngg
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