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Air Evacuation and Bleeding the Circuit
The air and/or humidity left inside the refrigeration circuit can contaminate the refrigerant
and cause abnormal spikes in pressure, leading to eventual compressor malfunction.
Therefore, after having connected the indoor and outdoor units to create a closed system, it is
necessary to bleed the air and humidity out of the circuit through the use of a vacuum pump.
Evacuation should be performed upon initial installation or when the unit is relocated.
Evacuation Instructions
Before using a vacuum pump and manifold gauge,
read their operation manuals to become familiarized
with using them properly.
1) Unscrew and remove the caps from the
2-way and 3-way valves.
2) Unscrew and remove the cap from the
service port.
3)
Connect the blue (low) hose of the
manifold gauge to service port on the
outdoor unit’s 3-way valve (use an
adapter if needed). Ensure that the pin
fully engages the schrader valve.
4) Connect the yellow (middle) hose from the
manifold gauge to the vacuum pump.
5)
Open the low pressure valve of the manifold
gauge. Keep the high pressure valve closed.
Page 37
7
Outdoor Unit Installation Instructions
Outdoor Unit
Installation
Vacuum PumpService Port
BEFORE PERFORMING EVACUATION
Check to make sure that both high-pressure
and low-pressure pipes between the indoor
and outdoor units are connected properly
in accordance with the “Refrigerant Piping
Connection” section of this manual.
Check to make sure all wiring is connected
properly.
High Pressure
Valve
Service
Port Nut
3-Way
Valve
2-way
Valve
3-way Valve
Refrigerant Flow Direction
Indoor Unit
Valve Cap
Valve Cap
Yellow (middle) hose
Vacuum Pump
3-Way Valve
Blue (low) hose
Low Pressure
Valve
Low Pressure Gauge High Pressure Gauge
Manifold Gauge
[2] Turn
[1] Turn
[1] Turn
Step 2
Step 3-5
Step 1
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