Engine 2014: Electricity

1. A The thermostats, manual stations, and test station for each zone are all wired in series with each other and are normally closed.
2. B The thermostats, manual stations, and test station for each zone are all wired in series with each other and are normally open.
3. C The thermostats, manual stations, and test station for each zone are all wired in parallel with each other and are normally closed.
4. D The thermostats, manual stations, and test station for each zone are all wired in parallel with each other and are normally open.

Tip: press A-D to answer