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AIR EVACUATION
Preparations and Precautions
Evacuation Instructions
Air and foreign matter in the refrigerant circuit can cause abnormal rises in pressure,
which can damage the Heat Pump, reduce its efficiency, and cause injury. Use a
vacuum pump and manifold gauge to evacuate the refrigerant circuit, removing any
non-condensable gas and moisture from the system.
Evacuation should be performed upon initial installation and when refrigerant is
removed for any reason.
1. Connect the charge hose of the manifold
gauge to service port on the outdoor
unit’s low pressure valve.
2. Connect another charge hose from the
manifold gauge to the vacuum pump.
3. Open the Low Pressure side of the
manifold gauge. Keep the High Pressure
side closed.
4. Turn on the vacuum pump to evacuate
the system.
5. Run the vacuum for at least 15 minutes, or
until the Micron Gauge reads 500 Micron.
6. Close the Low Pressure side of the
manifold gauge, and turn off the
vacuum pump.
7. Wait for 5 minutes, then check that
there has been no change in system
pressure.
8. If there is a significant change in
system pressure, check for leaks.
If there is no change in system
pressure, unscrew the cap from
the packed valve (high pressure
valve). Pressure rises but becomes
stable below 1000 Microns, ok to
open valves. Pressure becomes
stable above 1000 but below 2000
Microns there is moisture in system,
further evacuation and dehydration
required. Pressure rises above 2000
Microns or does not become stable,
there is a leak.
9. Insert hexagonal wrench into the
packed valve (high pressure valve)
and open the valve by turning the
wrench in a 1/4 counterclockwise
turn. Listen for gas to exit the
system, then close the valve after 5
seconds.
BEFORE PERFORMING EVACUATION
Check to make sure the refrigerant pipes between the indoor and outdoor
units are connected properly.
Check to make sure all wiring is connected properly.
Air E
v
acuation
Manifold Gauge
Compound
gauge
-76cmHg
Low pressure
valve
High pressure
valve
Pressure hose /
Charge hose
Charge hose
V
acuum
pump
Pressure gauge
Low pressure valve
500 Micron
Vacuum
pump
Содержание 18K
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