5-18 What is the minimum time you should continue charging a closed-loop system

after fluid first comes out of the drain hose?

a)

60

minutes

b)

30

minutes

c)

20

minutes

d)

10

minutes

5-19 What is the fluid capacity of a system with 100 feet of 1" copper tubing, 10

typical 3' by 8' solar collectors and a 6" by 50" shell and tube heat exchanger?

a)

5.5 gallons

b)

10.4 gallons

c)

15.3 gallons

d)

20.2 gallons

5-20 What should the charging pressure of the system in 5-19 be at sea level, if it

has 2 #30 expansion tanks when the fluid temperature is 100 F?

a)

30

PSI

b)

36

PSI

c)

42

PSI

d)

48

PSI

5-21 What if the same system is at 4000 feet above sea level?

a)

28

PSI

b)

32

PSI

c)

34

PSI

d)

38

PSI

5-22 Which of these is an acceptable technique when replacing sensor wires?

a)

Staple them at four foot intervals to the pipe insulation

b)

Run them through existing electrical conduit

c)

Run them under the pipe insulation

d)

Cable tie them to the outside of the pipe insulation

**REPAIR**

200

5.4 QUESTIONS FOR SELF-STUDY