Chapter 5: Hot Water Heating System Equipment & Operation Flashcards
Special diverter fittings are required in __________ to ensure an adequate flow of water though each convector.
A) One-pipe hot water system
B) Loop system
C) Two-pipe reverse return systems
D) Multi-zone systems
A) One-pipe hot water system
With the pump running in a hot water heating system, the normal differential pressure between the suction and discharge is ___________.
A) 25kPa (4psi)
B) 55kPa (8psi)
C) 75kPa (12psi)
D) 10kPa (1.5psi)
B) 55kPa (8psi)
Which of the following should be included in the routine operation of a hot water heating system?
A) Testing the controls and 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
D) All of the above
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 system vent valves, or check operation of the automatic air venting system
D) Increase the temperature of the system to boil the trapped air out
C) Open the system vent valves, or check operation of the automatic air venting system
An air pocket in a hot water heating system will cause:
A) Total or partial blockage of water flow to some parts of the system
B) Noise in the system
C) Insufficient water circulation
D) Insufficient heat in parts of the system
E) All of the above
E) All of the above
Firing a hot water boiler after refilling with water will result in:
A) Scaling
B) Release of air into the system
C) Change of state
D) Overheating
E) Chemical destabilization
B) Release of air into the system
The expansion tank in a hot water heating system is normally attached to the:
A) Highest point in the system directly above the boiler
B) Boiler or the hot water supply line near the boiler
C) Return line directly before the boiler
D) Supply line above the lowest convector
E) Supply line after the circulating pump
B) Boiler or the hot water supply line near the boiler
To prevent hot water heating system damage:
A) The vents should be opened wisely frequently
B) A drain valve should be temporarily installed before the boiler
C) The boiler should be blown down frequently after start up
D) A temporary strainer should be installed before the circulating water pump
E) The expansion valve should be drained several times
D) A temporary strainer should be installed before the circulating water pump
Typical construction contaminants sometimes encountered in a new hot water system are:
A) Welding slag, soldering flux
B) Thread cuttings, thread cutting oils
C) Pipe dope
D) Dirt
E) All of the above
E) All of the above
After a steam heating system has been operating for some time, you notice that some sections of the system are still cold. Which one of the following could be the cause of this?
A) Boiler water temperature too low
B) Steam does not contain enough heat
C) Boiler water pressure too low
D) Air is trapped in the affected sections
E) Condensate temperature too low
D) Air is trapped in the affected sections
Diverter fittings are used in one pipe system in the supply lines to heating units when:
A) A higher heating output is required from the heating unit
B) To compensate for a low heating load
C) The distance from the boiler to heating unit is short
D) There are no balancing valves installed in the supply line
E) A hydraulic balance must be corrected
A) A higher heating output is required from the heating unit
The highest point of a heating system above the boiler is 19.8m. The pressure on the boiler should indicate at least:
A) 255kPa
B) 25psi
C) 206kPa
D) 46psi
E) 216kPa
C) 206kPa (19.8x21m=206kPa)
A new hot water system must be cleaned before start up to:
A) Prevent air infiltration
B) Keep the boiler inspector happy
C) Prevent the water from becoming acidic and corrosive
D) Keep the water clean
E) Fulfill the contractor’s obligation
C) Prevent the water from becoming acidic and corrosive
To regulate the flow of hot water to a zone circuit a:
A) Diverter fitting is used
B) Flow control valve is used
C) Pressure reducing valve is used
D) Gate valve is used
E) Balancing valve is used
E) Balancing valve is used
The correct quantity for each chemical used to clean a heating boiler includes:
1. 1kg/420L of trisodiumphosphate
2. 2L/340L of 18% muriatic acid
3. 1kg/420L of caustic soda
4. 1kg/250L of soda ash
A) 1,2,3,4
B) 1,3,4
C) 2,3,4
D) 1,2,4
E) 1,2,3
B) 1,3,4
