EPA Section 608 — Type II
Charging and service: practice questions
Our EPA 608 Type II bank has 14 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
What does high head pressure with a clean condenser and correct charge often indicate?
- A clogged liquid line filter-drier and nothing else
- A working system
- Non-condensables (air) in the system
- A low charge
Show the answer
C. Non-condensables (air) in the system — Air collects in the condenser and raises head pressure.
Question 2
How should a zeotropic blend such as R-407C be charged?
- Either way
- Through the high side while running
- As a vapor
- As a liquid
Show the answer
D. As a liquid — Charging as liquid prevents fractionation; meter liquid carefully into the suction side.
Question 3
What is the purpose of a crankcase heater?
- To raise head pressure
- To heat the room
- To defrost the evaporator
- To keep refrigerant from migrating into and condensing in the compressor oil
Show the answer
D. To keep refrigerant from migrating into and condensing in the compressor oil — Liquid in the crankcase can cause slugging at startup.
Question 4
How is a system with a thermostatic expansion valve (TXV) usually checked for correct charge?
- By measuring superheat at the outdoor unit only
- By counting the fan blades
- By measuring subcooling
- By weighing the compressor
Show the answer
C. By measuring subcooling — Fixed-orifice systems are typically charged by superheat.
Question 5
If a vacuum rises quickly and keeps rising after the pump is isolated, what does it indicate?
- A leak in the system
- Moisture only
- Too much oil
- A perfect evacuation
Show the answer
A. A leak in the system — Rising then levelling off suggests moisture; continuous rise suggests a leak.