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3-Way Valve
The Arctic Heat Pump has a built in 3-Way switching valve that is powered in 240 VAC
– only 240 VAC Normally Open switches should be used. We recommend Belimo or
Caleffi 3-way valves with 1” NPT. These valves also come with built in internal dry
contact switch that is used in most of our cooling layouts to activate an auxiliary
source such as a circulation pump. When using a spring-loaded valve such as
mentioned above you will only use the S and L2 contacts on the 3-Way Valve
terminal block. L1 is reserved for dual motorized switches.
Connect the black wires of the 3-way valve to either terminal on the Arctic Heat
Pump. The red wires on the 3-way valve are the internal switch that closes once the 3- way valve is
energized and opens.
When installing a 3-way valve pay careful attention to the direction of flow. The bottom of the valve is
the AB connection and is common flow that both paths take. B is the Normally Open (NO) path that is
opened when no power is supplied to the valve. A is the Normally Closed (NC) path and is energized
when 240 is supplied to the valve from the heat pump if cooling mode is active on the controller.
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