Evacuation - Rinnai Pro Series Installation Manual

Evacuation

Air and foreign matter in the refrigerant circuit can cause abnormal rises in pressure. This can damage
the system, reduce its efficiency, and may cause injury. Use a vacuum pump and vacuum stat to
evacuate the refrigerant circuit and remove any non-condensable gas and moisture from the system.
Evacuation MUST be performed after completion of the dry nitrogen pressure test. Before
performing evacuation check to make sure:
• The connective pipes between the indoor and outdoor units are connected properly
• All wiring is connected correctly
Evacuation
1. Vacuum the indoor interconnecting pipework to a minimum of
500 µm of Hg.
2. Isolate the vacuum pump from the system and let the
vacuum stand for one hour to ensure vacuum is maintained
at 600 µm of Hg or below. For more information, refer to
'Refrigerant handling code of practice 2007'.
3. If the system vacuum pressure decreases to a value greater
than 600 µm after one hour of standing, the pressure and leak test needs to be repeated to find
the leak location.
4. If the system vacuum pressure remains below 600 µm after one hour of standing, fasten the
Schrader valve and remove all vacuum fittings.
Charging the system
1. Unscrew the cap from the packed valve (high pressure valve).
2. Insert hexagonal wrench into the packed valve and open the valve by
turning the wrench anti-clockwise. Continue to turn until valve is fully
back seated, and listen for the refrigerant entering the circuit.
3. Tighten the valve caps on the two valves by hand. You may
tighten it further using a torque wrench if needed.
Adding refrigerant
Some systems require additional charge depending on pipe lengths. The standard pre-charged
pipe length for all models is 15 m. For pipe lengths greater than 15 m, add 24 g/m. For less than
15 m there is no requirement to remove charge.
The refrigerant must be charged from the service port on the outdoor unit's low pressure valve.
When opening the valve stems, turn the hexagonal wrench anti-clockwise until it hits
against the back stop. Do not try to force the valve to open further.
CAUTION
Check to make sure there is no refrigerant leak after completing the installation. If there
is a leak, ventilate the area immediately and evacuate the system.
Never mix refrigerant types.
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Vacuum pump
Vacuum hose
Flare nut
Valve stem
Valve body
Cap