Issue
Customer has an application to control a heat pump and would like to use the b3867. The concern is that the triac outputs switch the 24v common, not the 24v hot. Most heat pumps will expect the 24v hot to be switched not the 24v common that is grounded. An interposing relay could be used on these outputs but it is more cost effective (both labor and materials) if the relay could be eliminated.
Environment
b3867
Cause
Customer has an application to control a heat pump and would like to use the b3867. The concern is that the triac outputs switch the 24v common, not the 24v hot. Most heat pumps will expect the 24v hot to be switched not the 24v common that is grounded. An interposing relay could be used on these outputs but it is more cost effective (both labor and materials) if the relay could be eliminated.
Resolution
In this case a relay will be required.
The i2 controller technical reference does not specifically mention that you cannot switch X1 (hot) but the output terminal block on the controller itself has the following label: "Note: Triac outputs must switch the grounded leg only. See manual."
If the load was wired on the X2, the hot leg (X1) would be shorted to ground and the load would not see 24V.
