Air Evacuation - Rinnai Pro Series Installation Manual

Air evacuation

Any foreign matter in the refrigerant circuit can cause abnormal rises in pressure, which can cause
damage to the unit, reduce its efficiency, and cause injury. Use a vacuum pump and manifold
gauge to evacuate the refrigerant circuit, removing non-condensible gas and moisture from the
system.
Evacuation should be performed upon installation.
Before performing evacuation:
5 Make sure the connective pipes between the indoor and outdoor units are connected properly.
5 Make sure all the wiring is connected.
5 Read relevant manifold and vacuum pump instructions to ensure correct use.
MANIFOLD GAUGE
Compound gauge
Low pressure valve
Charge hose
Low pressure valve
1. Connect the charge hose to the service port
of the outdoor unit's low pressure valve.
2. Connect the charge hose 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 and run for at least 30 minutes, or
until the compound gauge reads 100 kPa.
5. Close the low pressure valve and turn off
the vacuum pump. Wait for five minutes
then check there has been no change in
system pressure (a change may indicate a
gas leak).
6. If no change in system pressure, unscrew
cap from high pressure valve. Insert
hexagonal wrench and open the valve by
turning the wrench anticlockwise. Listen for
gas to exit the system, then close the valve
after approximately five seconds.
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High pressure valve
Charge hose
Vacuum pump
Valve body
Valve stem
7. Watch the pressure gauge for one minute
to make sure there is no change in
pressure. It should read slightly higher than
atmospheric pressure.
8. Remove the charge hose from the service
port, and using a hexagonal wrench, fully
open the low and high pressure valves.
When opening turn the wrench until it hits
against the stopper. DO NOT force the
valves to open further.
9. Allow the refrigerant to flow throughout the
system, ensure there are no leaks. If the
service valve spindles are leaking, front and
back seat them several times to re-adjust
the seal behind the valve stem. Apply Nylog
leak lock onto the threaded fittings before
the valve caps are placed back on.
10. Tighten caps by hand, then tighten with a
tool.
11. Ensure system is leak tested again to
ensure no gas leaks.
Flare nut
Cap