Issue
Clarification on how to wire Form A and Form K Triac outputs on i285-V / b3865-V controllers.
Environment
i2865-V
b3865-V
i2866-V
b3866-V
i2865-V-S
b3865-V-S
i2866-V-S
b3866-V-S
Cause
Had issues in the past with blown Triac outputs due to wiring, need to confirm how they are properly wired for Form A and Form K Triac outputs.
Resolution
As per 30-3001-810 i2 b3 865-866 Controller Installation Instructions (see page 5), you can configure your Triac so they switch the 24VAC (hot) or the GND (ground), but all Triac outputs must be configured the same.
The difference between the Form A and the Form K is that the Form A is two digital outputs using a single triac each while the Form K is a single tristate output using both physical triacs for the one (logical) output.
The Form A Triac outputs can be configured as either a hot or ground switch but the Form K must be configured as a ground switch (TRIAC REF tied to GND, Load to 24VAC).
