Chapter 13 Hot Water Heating System Equipment & Operation

Question 1

Special diverter fittings are required to ensure:

a) Proper flow to certain sections
b) Restricted flow to convectors or radiators
c) A flow imbalance between zone circuits
d) The prevention of continued circulation of hot water

Answer 1

a) Proper flow to certain sections

Question 2

With the pump running in a hot water heating system, the normal differential pressure between the suction and discharge is _________.

a) 25 kPa (4 psi)
b) 55 kPa (8 psi)
c) 75 kPa (12 psi)
d) 10 kPa (1.5 psi)

Answer 2

b) 55 kPa (8 psi)

Question 3

Which of the following should be included in the routine operation of a hot water heat-ing system?

a) Testing the controls and the safety relief valve on a regular basis
b) Keeping the boiler room and boiler clean and tidy
c) Refer periodically to the boiler manufacturer’s operation instructions
d) All of the above

Answer 3

d) All of the above

Question 4

If there is an air lock after repairs have been made on the piping system, the operator should:

a) Increase speed of the pump to force out the air
b) Add chemicals to absorb the trapped air
c) Open the systems vent valves or check operation of the automatic air venting system
d) Increase the temperature of the system to boil the trapped air out

Answer 4

c) Open the systems vent valves or check operation of the automatic air venting system

Question 5

The automatic fill valve is a ________ valve that keeps the system filled with water and maintains a set pressure in the system.

a) pressure reducing valve
b) air vent valve
c) back pressure valve
d) pressure control valve

Answer 5

a) pressure reducing valve