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Refrigerant Piping Connections
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REFRIGERANT PIPING CONNECTIONS
Pump Down, Cooling Only Mode
Use a vacuum pump that can evacuate down to 500 microns.
1. If moisture remains in the piping after the system is evacuated for two (2) hours, break the vacuum (down to 7.5 psi with nitrogen gas).
2. Evacuate the system again with the vacuum pump for at least one (1) hour to 500 microns.
3. If the system does not reach 500 microns within two (2) hours, repeat the vacuum break and evacuation procedure until the gauge does
not rise.
Pump Down Procedure
This procedure is performed when a unit has to be relocated or the refrigerant circuit is serviced. “Pumping down” is a term used to mean
collecting all refrigerant into the outdoor unit without the loss of any refrigerant. Follow the procedure and guidelines below to safely collect
refrigerant back into the outdoor unit. Always adhere to and be familiar with local codes regarding the handling of refrigerant.
The system must be placed in Cooling mode in order to proceed with the pump down procedure. If needed, refer to the sections on the next
page for proper steps to place the unit into Cooling Mode.
Perform Pump Down procedure only in the cooling mode.
1. Connect a low-pressure gauge with manifold hose to the charge
port on the gas line service valve.
2. Open the gas line service valve halfway.
3. Purge the air in the manifold hose using the refrigerant.
4. Close the liquid line service valve all the way.
5. Turn on the units power switch and start the cooling mode oper-
ation.
6. Observe the pressure gauge reading. When it gets to 1 to 0.5 kg/
cm2G (14.2 to 7.1 P.S.I.G), fully close the gas line valve and then
immediately turn the unit off.
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Pump down procedure is complete at this time and all refrigerant
should be collected into the outdoor unit.
Enabling Cooling Only Mode
Before running the Pump Down procedure, you must place the unit
into Cooling Only Mode. In order to be able to run Cooling Only
Mode, you must enter the unit into the Installer Mode by pressing the
Reset button and the JET MODE button simultaneously.
1. Shut down power to system completely.
2. Enter the Installer Mode as stated in paragraph above.
3. Set code to 45.
4. Press Power-ON button and select the code number 45.
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Unit should beep to acknowledge that code has been received.
5. Turn off power.
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Let unit cycle off for a minimum of 30 seconds.
6. Turn power back on to system.
Disabling Cooling Only Mode
After Pump Down procedure has been performed, you will need
to disable Cooling Only Mode, and place the unit back into normal
operating mode. Follow the procedure below.
1. Shut down power to system completely.
2. Enter the Installer Mode as stated in paragraph above.
3. Set code to 46.
4. Press Power-ON button and select the code number 46.
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Unit should beep to acknowledge that code has been received.
5. Turn off power.
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Let unit cycle off for a minimum of 30 seconds.
6. Turn power back on to system.
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Once the system is in Installer Mode (with Cooling Only Mode initi-
ated), automatic operation is suspended.
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Once Cooling Only Mode is disabled, the unit will return to normal
operation.
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Installer Code cannot be entered if the unit is running. The system
must be completely powered off.
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All Installer Code numbers must be entered into the system during
Power Off state (complete shutdown of the system).
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WLAN Module’s communication time will lag by about 1 minute after
unit is turned back on and in normal operating mode.
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Entire lock or Mode lock cannot be set if you set heating or automat-
ic operation through the central controller.
Never air purge with refrigerant as it can lead to refrigerant leakage which can cause bodily harm and injury, especially if inhaled.
Never inhale or handle refrigerant directly. Doing so may
cause bodily harm and injury.
