The Universal Controller Relay Board (UCRB2) is used to interconnect a DDC controller’s digital outputs to any device that requires a conventional thermostat input.
There are five inputs that control five relays. The first relay’s output (1/G) is an interlock for the other four, outputs 2, 3, 4 or 5 will not change state until output 1/G is on. The UCRB2 fits into 2.75” snaptrack.
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