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G3 Valve: Seasonal Switch Valve
G1 and G3 valves use 220v Primary from the CX34. Use conduit and install per local code.
The G3 port can be used to control a seasonal switch valve. The seasonal switch valve is used to isolate the
floor coils from the fan coils when switching over from heating to cooling. The seasonal switch valve is
controlled by parameter P50. When parameter P50 is 0, the valve is configured as a seasonal Switch.
When parameter P50 is 1, the valve is configured as a solar pre-heat valve. The CX34 compares the solar tank
temp and AC returned temp. When the solar tank temp – AC returned temp is ≥ 5 ℃, the 3-way valve G3S will
be on; when solar water tank temperature minus the air conditioning returned temperature is less than 2°C,
G3S will be off.
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