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77
Final Installation Procedures
Due to our policy of continuous product innovation, some specifications may change without notification.
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MULTI
F
MAX
MULTI
F
Triple Leak / Pressure Check Procedure, continued.
The bubble solution must be a solution designed for refrigerant leak testing. Common soap solution must never be used on refrigerant piping as
those contain chemicals that could corrode copper and brass, and cause product malfunction.
7. If the pressure does NOT drop for one (1) hour, the system passes the test.
8. If the pressure drops, there is a leak and it must be found. Remove the bubble solution with a clean cloth, repair the leak(s), and perform
the leak / pressure check again.
9. After the system has been thoroughly tested and no leaks are found, depressurize by loosening the charging hose connector at the nitro-
gen cylinder regulator. When system pressure returns to normal, completely disconnect the charging hose from the cylinder, and release
the nitrogen charge from all refrigerant piping. Wipe off any remaining bubble solution with a clean cloth.
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FINAL INSTALLATION PROCEDURES
Deep Evacuation Procedure
On Multi F systems, after the leak / pressure check is complete, the deep evacuation procedure must be performed to the refrigerant piping
and all connected indoor units. On Multi F MAX systems, the triple evacuation procedure (seen on page 78) must be performed. Deep evacu-
ation must be performed through the Schrader ports on the outdoor unit service ports.
The triple evacuation procedure seen on page 78 is a best practices recommendation for Multi F systems, but mandatory for Multi F MAX systems.
For faster evacuation, the Schrader core can be removed, and an auxiliary service port can used. Make sure to re-install the original Schrader core
before operating the system.
• Deep evacuate through both the liquid and gas (vapor) suction Schrader ports on the outdoor unit service ports.
• The outdoor unit service valves must remain closed and the stem head access caps tight.
Do not open the outdoor unit service valves
and release the factory refrigerant charge until trim charge is complete, and the system is ready to operate.
• Any field-installed ball valves in the refrigerant system (if used) must be open to ensure all piping is free and clear for deep evacuation on
all piping and connected indoor units.
• Do not apply power to the system before performing the deep evacuation procedure. There is a possibility that the EEV valve will close
and isolate sections of the piping system, making the deep evacuation procedure inconclusive.
•
Never perform evacuation using refrigerant.
• Use only a vacuum pump that can reach 500 microns, vacuum rated hoses or copper tubing, and a leak-free gauge manifold set.
• Use only new vacuum pump oil from a properly sealed (unopened) container, and change oil in pump before EVERY use.
• Subsequent oil changes will be necessary after several hours of continuous operation; have extra oil on hand.
• Use a quality micron gauge in good operating order and install as far away from pump as possible.
Deep Evacuation Procedure Steps
1. If this procedure is performed shortly after the leak / pressure test, the cap and core on the liquid and gas (vapor) suction Schrader ports
must have already been removed, and the manifold must already be connected. If the procedure was not performed shortly after the leak
/ pressure test, make sure to remove the cap and core on the liquid and gas (vapor) suction Schrader ports. Verify that the service valves
on the outdoor unit are closed, and the stem head access caps are tight.
2. Connect the gauge manifold along with the vacuum pump to the liquid and gas (vapor) suction Schrader ports (with core removed) using a
vacuum hose. Open the gauge manifold and the vacuum pump valves.
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