The grade of fuel oil most commonly used in residential oil-fired furnaces is:
A) Number 5. B) Number 1. C) Number 6. D) Number 2.
Question 2
Branch selectors are boxes in heat recovery VRF systems that allow:
A) One refrigerant line to feed a single indoor unit.
B) Multiple refrigerant lines to feed multiple indoor units.
C) One refrigerant line to feed multiple indoor units.
D) Multiple refrigerant lines to feed a single indoor unit.